Molecular Biology of The Cell, 5th Edition - (2023)

Molecular Biology of

THE CELL Fifth Edition

Molecular Biology of

THE CELL Fifth Edition

Bruce Alberts Alexander Johnson Julian Lewis Martin Raff Keith Roberts Peter Walter

With problems by John Wilson Tim Hunt

Garland Science Vice President: Denise Denise Schanck Assistant Editor: Sigrid Masson Production Editor and Layout: Layout: Emma Jeffcock Jeffcock Senior Publisher: Jackie Harbor Illustrator: Nigel Orme Designer: Matthew McClements, Blink Studio, Ltd. Editors: Marjorie Anderson and Sherry Granum Copy Editor: Bruce Goatly Indexer: Merrall-Ross International, Ltd. Permissions Coordinator: Mary Dispenza Cell Biology Interactiv Interactive e Artistic and Scientific Direction: Direction: Peter Walter Walter Narrated by: Julie Theriot Production Design and Development: Michael Morales

© 2008, 2002 by Bruce Alberts, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, and Peter Walter. © 1983, 1989, 1994 by Bruce Alberts, Dennis Bray, Julian Lewis, Martin Raff, Keith Roberts, and James D. Watson.

Bruce Alberts received his Ph.D. from Harvard University University and is Professor of Biochemistry and Biophysics at the University of California, San Francisco Francisco.. For 12 years, he served as President of the U.S. National Academy of Sciences (1993–2005). Alexander Johnson received his Ph.D. from Harvard University University and is Professor of Microbiology and Immunology and Director of the Biochemistry Biochemistry,, Cell Biology, Genetics, and Developmental Biology Graduate Program at the Univers University ity of California, San Francisco. Julian Lewis received his D.Phil. from the University of Oxford and is a Principal Scientist at the London Research Institute of Cancer Research UK. Martin Raffreceived Raffreceived his M.D. from McGill University and is at the Medical Research Council Laboratory for Molecular Cell Biology and the Biology Department at University College London. Keith Roberts received his Ph.D. from the University of Cambridge and is Emeritus Fellow at the John Innes Centre, Norwich. Peter Walter received his Ph.D. from The Rockefeller University in New York York and is Professor and Chairman of the Department of Biochemistry and Biophysics at the University of California, San Francisco, and an Investigator of the Howard Hughes Medical Institute.

This book contains information obtained from authentic and highly regarded sources. Reprinted material is quoted with permission, and sources are indicated. A wide variety of references are listed. Reasonable efforts have been made to publish reliable data and information, but the author and the publisher cannot assume responsibility for the validity of all materials or for the consequences of their use. All rights reserved. No part of this book covered by the copyright heron may be reproduced or used in any format in any form or by any means—graphic, electronic, or mechanical, including photocopying, recording, recording, taping, or information storage and retrieval systems—without permission of the publisher publisher.. Library of Congress Cataloging-in-Publication Data Molecular biology of the cell / Bruce Alberts … [et al.].-- 5th ed. p. cm ISBN 978-0-8153-4105-5 (hardcover)---ISBN 978-0-8153-4106-2 (paperback) 1. Cytology. 2. Molecular biology. I. Alberts, Bruce. QH581.2 .M64 2008 571.6--dc22 2007005475 CIP

Published by Garland Science, Taylor & Francis Group, LLC, an informa business, 270 Madison Avenue, New York NY 10016, USA, and 2 Park Square, Milton Park, Abingdon, OX14 4RN, UK. Printed in the United States of America 15 14 13 12 11 10 9 8 7 6 5 4 3 2


Preface In many respects, we understand the structure of the universe better than the workings of living cells. Scientists can calculate the age of the Sun and predict when it will cease to shine, but we cannot explain how it is that tha t a human hu man being may live for eighty years but a mouse for only two. We know the complete genome sequences of these and many other species, but we still cannot predict how a cell will behave if we mutate a previously unstudied gene. Stars may be 1043 times bigger, but cells are more complex, more intricately structured, and more astonishing products of the laws of physics and a nd chemistry. Through heredity and natural selection, operating from the beginnings of life on Earth to the present day—that is, for about 20% of the age of the universe—living cells have been progressively refining and extending their molecular machinery, and recording the results of their experiments in the genetic instructions they pass on to their progeny. With each edition of this book, we marvel at the new information that cell biologists have gathered in just a few years. But we are even more amazed and daunted at the sophistication sop histication of the mechanisms that we encounter. The deeper we probe into the cell, the more we realize how how much remains remains to be understood. understood. In the days of our innocence, working on the first edition, we hailed the identification of a single protein—a signal receptor, say—as a great step st ep forward. Now we appreciate that each each protein is generally generally part of a complex with many others, working together as a system, regulating one another’s another’s activities in subtle ways, and held in specific positions by binding to scaffold sc affold proteins that give the chemical factory a definite spatial structure. Genome sequencing has given us virtually complete molecular parts-lists for many different organisms; genetics and biochemistry have told us a great deal about what those parts are capable of individually and which ones interact with which others; but we have only the most primitive grasp of the dynamics of these biochemical systems, with all their interlocking control loops. Therefore, although there are great achievements to report, cell biologists face even greater challenges for the future. In this edition, we have included new material on many topics, ranging from epigenetics, histone modifications, small RNAs, and comparative genomics, to genetic noise, cytoskeletal dynamics, cell-cycle control, apoptosis, stem cells, and novel cancer therapies. As in previous editions, we have tried above all to give readers a conceptual framework for the mass of information that we now have about cells. This means going beyond the recitation of facts. The goal is to learn how to put the facts to use—to reason, to predict, and to control the behavior of living systems. To help readers on the way to an active understanding, we have for the first time incorporated end-of-chapter problems, written by John Wilson and Tim Hunt. These emphasize a quantitative approach and the art of reasoning from experiments. A companion volume,Molecular volume, Molecular Biology of the Cell, Fifth Edition: The Problems Book (ISBN 978-0-8153-4110-9), by the same authors, gives complete answers to these problems and also contains more than 1700 additional problems and solutions. A further major adjunct to the main book is the attached Media DVD-ROM disc. This provides hundreds of movies and animations, including many that are new in this edition, showing cells and cellular processes in action and bringing the text to life; the disc also now includes all the figures and tables from the main



PowerPoint® presentations. Other ancillaries available for book, pre-loaded into PowerPoint® the book include a bank of test questions and lecture outlines, available to qualified instructors, and a set of 200 full-color overhead transparencies. Perhaps the biggest change is in the physical structure of the book. In an effort to make the standard Student Edition somewhat more portable, we are providing Chapters 21–25, covering multicellular systems, in electronic (PDF) form on the accompanying disc, while retaining in the printed volume Chapters 1–20, covering the core of the usual cell biology curriculum. But we should emphasize that the final chapters have been revised and updated as thoroughly as the rest of the book and we sincerely hope that they will be read! A Reference Edition (ISBN 978-0-8153-4111-6), containing the full set of chapters as printed pages, is also available for those who prefer it. Full details of the conventions adopted in the book are given in the Note to the Reader that follows this Preface. As explained there, we have taken a drastic approach in confronting the different rules for the writing of gene names in different species: throughout this book, we use the same style, regardless of species, and often in defiance of the usual species-specific conventions. As always, we are indebted to many people. Full acknowledgments for scientific help are given separately, but we must here single out some exceptionally important contributions: Julie Theriot is almost entirely responsible for Chapters 16 (Cytoskeleton) and 24 (Pathogens, Infection, and Innate Immunity), and David Morgan likewise for Chapter 17 (Cell Cycle). Wallace Marshall and Laura Attardi provided substantial help with Chapters 8 and 20, respectively respectively,, as did Maynard Olson for the genomics section of Chapter 4, Xiaodong Wang for Chapter 18, and Nicholas Harberd for the plant section of Chapter 15. We also owe a huge debt to the staff of Garland Science and others who helped convert writers’ efforts into a polished final product. Denise Schanck directed the whole enterprise and shepherded the wayward authors along the road with wisdom, skill, and kindness. Nigel Orme put the artwork into its final form and supervised the visual aspects of the book, including the back cover, cover, with his usual flair. Matthew McClements designed the book and its front cover. Emma Jeffcock laid out its pages with extraordinary speed and unflappable efficiency, dealing impeccably with innumerable corrections. Michael Morales managed the transformation of a mass of animations, video clips, and other materials into a user-friendly DVD-ROM. Eleanor Lawrence and Sherry Granum updated and enlarged the glossary. Jackie Harbor and Sigrid Masson kept us organized. Adam Sendroff kept us aware of our readers and their needs and reactions. Marjorie Anderson, Bruce Goatly, and Sherry Granum combed the text for obscurities, infelicities, and errors. We thank them all, not only for their professional skill and dedication and for efficiency far surpassing our own, but also for their unfailing helpfulness helpfulness and friendship: they have made it a pleasure to work on the book. Lastly, and with no less gratitude, we thank our spouses, families, friends and colleagues. Without Without their patient, enduring support, sup port, we could not have produced any of the editions of this book.


Contents Special Features Detailed Contents Acknowledgments A Note to the Reader

viii ix xxvi xxxi



1. 2. 3.

Cells and Genomes Cell Chemistry and Biosynthesis Proteins



4. 5. 6. 7.

DNA, Chromosomes, and Genomes DNA Replication, Repair, and Recombination How Cells Read the Genome: From DNA to Protein Control of Gene Expression



8. 9.

Manipulating Proteins, DNA, and RNA Visualizing Cells



10. 11. 12.

Membrane Structure Membrane Transport of Small Molecules and the Electrical Properties of Membranes Intracellular Compartments and Protein Sorting

13. 14. 15. 16. 17. 18.

Intracellular Vesicular Traffic Energy Conversion: Mitochondria and Chloroplasts Mechanisms of Cell Communication The Cytoskeleton The Cell Cycle Apoptosis



19. 20.

Cell Junctions, Cell Adhesion, and the Extracellular Matrix Cancer

1131 1205

21. 22. 23. 24. 25.

Chapters 21–25 available on Media DVD-ROM Sexual Reproduction: Meiosis, Germ Cells, and Fertilization Development of Multicellular Organisms Specialized Tissues, Stem Cells, and Tissue Renewal Pathogens, Infection, and Innate Immunity The Adaptive Immune System

1269 1305 1417 1485 1539

Glossary Index Tables

The Genetic Code, Amino Acids

1 45 125

195 263 329 411 501 579 617 651 695 749 813 879 965 1053 1115

G–1 I–1 T–1


Special Features Table 1–1 Table 1–2 Table 2–1 Table 2–2 Table 2–3 Table 2–4 Panel 2–1 Panel 2–2 Panel 2–3 Panel 2–4 Panel 2–5 Panel 2–6 Panel 2–7 Panel 2–8 Panel 2–9 Panel 3–1 Panel 3–2 Table 3–1 Panel 3–3 Table 4–1 Table 5–3 Table 6–1 Panel 8–1 Table 10–1 Table 11–1 Panel 11–2 Panel 11–3 Table 12–1 Table 12–2 Table 14–1 Panel 14–1 Table 15–5 Panel 16–2 Panel 16–3 Table 17–2 Panel 17–1

Some Genomes That Have Been Completely Sequenced p. 18 The Numbers of Gene Families, Classifi Classified ed by Function, That Are Common to All Three Domains of the Living World p. 24 Covalent and Noncovalent Chemical Bonds p. 53 The Types of Molecules That Form a Bacteria Bacteriall Cell p. 55 Approximate Chemical Composition Compositionss of a Typical Bacterium and a Typical Mammalian Cell p. 63 Relationship Relationshi p Between the Standard Free-Energy Change, DG°, °, and the Equilibrium Constant p. 77 Chemical Bonds and Groups Commonly Encountered in Biologica Biologicall Molecules pp. 106–107 Water and Its Influence on the Behavior of Biological Molecules The Principal Types of Weak Noncovalent Bonds that Hold Macromolecul Macromolecules es Together An Outline of Some of the Types of Sugars Commonly Found in Cells Fatty Acids and Other Lipids A Survey of the Nucleotides Free Energy and Biologica Biologicall Reactions Details of the 10 Steps of Glycolysis The Complete Citric Acid Cycle The 20 Amino Acids Found in Proteins Four Different Ways of Depicting a Small Protein, the SH2 Domain Some Common Types of Enzymes Some of the Methods Used to Study Enzymes

pp. 108–109 pp. 110–111 pp. 112–113 pp. 114–115 pp. 116–117 pp. 118–119 pp. 120–121 pp. 122–123 pp. 128–129 pp. 132–133 p. 159 pp. 162–163

Some Vital Statistic Statisticss for the Human Genome p. 206 Three Major Classes of Transposabl ransposable e Elements p. 318 Principal Types of RNAs Produced in Cells p. 336 Review of Classical Genetics pp. 554–555 Approximate Lipid Compositions of Different Cell Membranes p. 624 A Com Comparis parison on of Ion Conc Concentr entration ationss Ins Inside ide and Outs Outside ide a Typica ypicall Mamm Mammalian alian Cell p. 652 The Derivation of the Nernst Equation p. 670 Some Classical Experiments on the Squid Giant Axon p. 679 Relative Volumes Occupied by the Major Intracellul Intracellular ar Compartmen Compartments ts in a Liver Cell (Hepatocyte) p. 697 Relative Amounts of Membrane Types in Two Kinds of Eucaryotic Cells p. 697 Product Yields from the Oxidation of Sugars and Fats p. 824 Redox Potentials p. 830 The Ras Superfamily of Monomeric GTPases p. 926 The Polymerization of Actin and Tubulin pp. 978–979 Accessory Proteins that Control the Assembly and Position of Cytoskeletal Filaments pp. 994–995 Summary of the Major Cell-Cycle Regulatory Proteins p. 1066 The Principle Stages of M Phase (Mitosis and Cytokines Cytokinesis) is) in an Animal Cell pp. 1072–1073


Detailed Contents Chapter 1 Cells and Genomes




All Cells Store Their Hereditary Information in the Same Linear Chemical Code (DNA) All Cells Replicate Their Hereditary Information by Templated Polymerization All Cells Transcribe Portions of Their Hereditary Information into the Same Intermediary Form (RNA) All Cells Use Proteins as Catalysts All Cells Translate RNA into Protein in the Same Way The Fragment of Genetic Information Information Corresponding to One One Protein Is One Gene Life Requires Free Energy All Cells Function as Biochemical Factories Dealing with the Same Basic Molecular Building Blocks All Cells Are Enclosed in a Plasma Membrane Across Which Which Nutrients and Waste Materials Must Pass A Living Cell Can Exist with Fewer Than 500 Genes Summary

9 10 11



Cells Can Be Powered by a Variety of Free Energy Sources Some Cells Fix Nitrogen and Carbon Dioxide for Others The Greatest Biochemical Diversity Exists Exists Among Procaryotic Cells The Tree Tree of Life Has Three Three Primary Branches: Bacteria, Archaea, Archaea, and Eucaryotes Some Ge Genes Ev Evolve Ra Rapidly ; Others Are Hi Highly Conser ve ved Most Bacteria and Archaea Have 1000–6000 Genes New Genes Are Generated from Preexisting Genes Gene Duplications Give Rise to Families of Related Genes Within a Single Cell

12 13 14

2 3 4 5 6

The World of Animal Animal Cells Is Represented By a Worm, a Fly, Fly, a Mouse, and a Human Studies in Drosophila Prov ovid ide e a Key Key to Ver erte tebr brat ate e Dev Devel elop opme men nt The Vertebrate Vertebrate Genome Is a Product of Repeated Duplication Genetic Redundancy Is a Problem for Geneticists, But It Creates Opportunities for Evolving Organisms The Mouse Serves as a Model for Mammals Humans Report on Their Own Peculiarities We Are All Different in Detail Summary Problems References

36 37 38 39 39 40 41 42 42 44

7 8

Chapter 2 Cell Ch Chemistry an and Bi Biosynthesis





Cells Are Made From a Few Types of Atoms The Outermost Electrons Determine How Atoms Atoms Interact Covalent Bonds Form by the Sharing of Electrons There Are Different Different Types of Covalent Covalent Bonds An Atom Often Behaves as if It Has a Fixed Radius Water Is the Most Abundant Substance in Cells Some Polar Molecules Are Acids and Bases Four Types of Noncovalent Attractions Help Bring Molecules Together Togeth er in Cells A Cell Is Formed from Carbon Compounds Cell Ce llss Con Conta tain in Fou ourr Maj Major or Fam amil ilie iess of of Sma Small ll Or Orga gani nicc Mol Molec ecul ules es Sugars Provide an Energy Source for Cells and Are the Subunits of Polysaccharides Fatty Acids Are Components of Cell Membranes, as Well as a Source of Energy Amino Acids Are the Subunits of Proteins Nucleotides Are the Subunits of DNA and RNA The Chemistry of Cells Is Dominated by Macromolecules with Remarkable Properties Noncovalent Bonds Specify Both the Precise Shape of a Macromolecule and its Binding to Other Molecules Summary

45 46 48 50 51 51 52



Cell Metabolism Is Organized by Enzymes Biological Order Is Made Possible by the Release of Heat Energy from Cells Photosynthetic Organisms Use Sunlight to Synthesize Organic Molecules Cel ells ls Obt btai ain n En Ener erg gy by th the e Oxi xida dati tion on of Or Org gan anic ic Mol olec ecul ules es Oxidation and Reduction Involve Electron Transfers Enzy En zyme mess Low ower er the Bar arri rier erss That Blo lock ck Ch Chem emic ical al Rea eact ctio ion ns How Enzymes Find Their Substrates: The Enormous Rapidity of Molecular Motions


15 16 17 18 19

Genes Can Be Transf Transferred erred Between Organisms, Both in the Laboratory and in Nature Sex Results in Horizontal Exchanges of Genetic Information Within a Species The Function of a Gene Can Often Be Deduced from Its Sequence More Than 200 Gene Families Are Common to All Three Primary Branches of the Tree of Life Mutations Reveal the Functions of Genes Molecular Biologists Have Focused a Spotlight on E. coli Summary




Eucaryotic Cells May Have Originated as Predators Modern Eucaryotic Cells Evolved from a Symbiosis Eucaryotes Have Hybrid Genomes Eucaryotic Genomes Are Big Eucaryotic Genomes Are Rich in Regulatory DNA The Genome Defines the Program Program of Multicellular Development

26 27 30 30 31 31

Many Eucaryotes Live as Solitary Cells: the Protists A Yeast Serves as a Minimal Model Eucaryote The Expression Levels of All The Genes of An Organism Can Be Monitored Simultaneously To Make Sense of Cells, We Need Mathematics, Mathematics, Computers, and Quantitative Information Arabidopsis Has Been Chosen Out of 300,000 Species As a Model Plant

32 33

22 22 23 23 24 26

34 35 36

The Free-Energy Change Change for a Reaction Determines Whether Whether It Can Occur The Concentration of Reactants Reactants Influences the Free-Energy Free-Energy Change and a Reaction’s Direction For Sequential Reactions, DG° Values Are Additive Ac ti tivated Ca Carrier Mo Molecules Ar Are Es Essential fo for Bi Biosynthesis The Formation of an Activated Carrier Carrier Is Coupled to an Energetically Favorable Reaction

53 54 55 55 58 59 61 62 63 65

66 68 70 71 72 74 75 76 77 78 79


Detailed Contents

ATP Is the Most Widely Used Activated Carrier Molecule Energy Stored in ATP Is Often Harnessed to Join Two Molecules Together Tog ether NADH and NADPH Are Important Electron Carriers There Are Many Other Activated Activated Carrier Molecules in Cells The Synthesis of Biological Biological Polymers Is Driven by ATP ATP Hydrolysis Summary




Glycolysis Is a Central ATP-Producing Pathway Fermentations Produce ATP in the Absence of Oxygen Glycolysis Illustrates How Enzymes Couple Oxidation to Energy Storage Organisms Store Food Molecules in Special Reservoirs Most Animal Cells Derive Their Energy from Fatty Acids Between Meals Sugarss and Fat Sugar Fatss Are Both Degr Degraded aded to Acetyl Acetyl CoA in in Mitochon Mitochondria dria The Citric Acid Cycle Generates Generates NADH by Oxidizing Acetyl Groups to CO2 Electron Transport Transport Drives the Synthesis of the Majority of the ATP in Most Cells Amin Am ino o Aci Acids ds an and d Nuc Nucle leot otid ides es Ar Are e Par Partt of of the the Ni Nitr trog ogen en Cyc ycle le Metabolism Is Organized and Regulated Summary Problems References

88 89

Chapter 3 Proteins

81 82 83 84 87

91 91 95 96 97 100 100 10 0 101 103 103 124




The Shape of a Protein Is Specified by Its Amino Acid Sequence Proteins Fold into a Conformation of Lowest Energy The a Helix and the b Sheet Are Co Common Folding Patterns Protein Domains Are Modular Units from which Larger Proteins Are Built Few of the Many Possible Polypeptide Chains Will Be Useful to Cells Proteins Can Be Classified into Many Families Sequence Searches Can Identify Close Relatives Some So me Pr Prot otei ein n Dom Domai ains ns Fo Form rm Pa Parts rts of Ma Many ny Di Diff ffer eren entt Pro Prote tein inss Certa Ce rtain in Pai Pairs rs of of Doma Domain inss Are Are Foun Found d Tog Toget ethe herr in Man Manyy Prot Protei eins ns The Human Genome Encodes a Complex Set of Proteins, Proteins, Revealing Much That Remains Unknown Larger Protein Molecules Often Contain More Than One Polypeptide Chain Some Proteins Form Long Helical Filaments Many Pr Protein Mo Molecules Ha Have El Elongated, Fi Fibrous Sh Shapes Many Proteins Contain a Surprisingly Large Amount of Unstructured Polypeptide Chain Cova Co vale lent nt Cro Cross ss-L -Lin inkag kages es Oft Often en Sta Stabi bili lize ze Ext Extra race cell llul ular ar Pro Prote tein inss Protein Molecules Often Serve as Subunits for the Assembly of Large Structures Many Structures in Cells Are Capable of Self-Assembly Assembly Factors Often Aid the Formation of Complex Biological Structures Summary

125 130 131



All Proteins Bind to Other Molecules The Surface Conformation of a Protein Protein Determines Its Chemistry Sequence Comparisons Between Protein Family Members Highlight Crucial Ligand-Binding Sites Proteins Bind to Other Proteins Through Through Several Types of Interfaces Antibody Binding Sites Are Especially Versatile The Equilibrium Constant Measures Measures Binding Strength

153 154

Enzymes Are Powerful and Highly Specific Catalysts Substrate Binding Is the First Step in Enzyme Catalysis Enzymes Speed Reactions by Selectively Stabilizing Transition States Enzymes Ca Can Us Use Si Simultaneous Ac Acid an and Ba Base Ca Catalysis Lysozyme Illustrates How an Enzyme Works Tightly Bound Small Molecules Add Extra Functions Functions to Proteins

158 159

135 136 137 139 140 14 0 141 14 1 142 142 143 145 146 147 14 7 148 149 151 152

155 156 156 157

160 160 161 166

Molecular Tunnels Channel Substrates in Enzymes with Multiple Catalytic Sites Multienzyme Complexes Help to Increase the Rate of Cell Metabolism The Cell Regulates the Catalytic Activities of its Enzymes Allost All osteri ericc Enzymes Enzymes Have Have Tw Two o or More More Bindin Binding g Sites Sites That That Inte Interac ractt Two Ligands Ligands Whose Binding Sites Sites Are Coupled Must Reciprocally Affect Each Other’s Binding Symmetric Protein Assemblies Produce Cooperative Allosteric Transitionss Transition The Allosteric Transition Transition in Aspartate Transcarbamoylase Transcarbamoylase Is Understood in Atomic Detail Many Changes in Proteins Are Driven by Protein Phosphorylation A Eucaryotic Cell Contains a Large Collection of Protein Kinases and Protein Phosphatases The Regulation of Cdk and Src Protein Protein Kinases Shows How a Protein Can Function as a Microchip Proteins That Bind and Hydrolyze GTP Are Ubiquitous Cellular Regulators Regulatory Proteins Control the Activity of GTP-Binding Proteins by Determining Whether GTP or GDP Is Bound Larg La rge e Pro Prote tein in Mov Movem emen ents ts Ca Can n Be Be Gen Gener erat ated ed Fr From om Sma Small ll One Oness Motor Proteins Produce Large Movements in Cells Membrane-Bound Transporters Transporters Harness Energy to Pump Molecules Through Membranes Proteins Often Form Large Complexes That Function as Protein Machines Protein Machines with Interchangeable Parts Make Efficient Use of Genetic Information The Activation of Protein Machines Machines Often Involves Positioning Positioning Them at Specific Sites Manyy Protei Man Proteins ns Are Cont Controlle rolled d by Multi Multisite site Cova Covalent lent Modif Modificati ication on A Complex Network Network of Protein Protein Interaction Interactionss Underlies Underlies Cell Function Function Summary Problems References

Chap Ch apte terr 4 DNA DNA,, Chro Chromo moso some mes, s, an and d Geno Genome mess

167 168 169 171 171 172 173 175 176 177 178 179 179 17 9 181 182 184 184 185 186 187 190 191 193

195 19 5



A DNA Molecule Consists of Two Complementary Chains of Nucleotides The Structure of DNA Provides a Mechanism Mechanism for Heredity In Eucaryotes, DNA Is Enclosed in a Cell Nucleus Summary

197 199 200 201



Eucaryotic DN DNA Is Is Packaged into a Set of of Chromosomes Chromosomes Contain Long Strings of Genes The Nucleotide Sequence of the Human Genome Shows How Our Genes Are Arranged Genome Comparisons Reveal Evolutionarily Conserved DNA Sequences Chromosomes Exist in Different States Throughout the Life of a Cell Each DNA Molecule That Forms a Linear Chromosome Must Contain Cont ain a Centrom Centromere, ere, Tw Two o Telomer Telomeres, es, and and Replication Replication Origin Originss DNA Mo Molecules Ar Are Hi Highly Co Condensed in in Ch Chromosomes Nucleosomes Are a Basic Unit of Eucaryotic Chromosome Structure The Structure of the Nucleosome Core Particle Reveals How DNA Is Packaged Nucleosomes Have a Dynamic D ynamic Structure, and Are Frequently Subjected to Changes Catalyzed by ATP-Dependent Chromatin-

202 204

Remodeling Complexes Nucleosomes Are Usually Packed Together into a Compact Chromatin Fiber Summary




Some Early Mysteries Concerning Chromatin Structure


205 207 208 209 210 211 212

216 218

Detailed Contents

Heterochromatin Is Highly Organized and Unusually Resistant to Gene Expression 220 The Core Histones Are Covalently Covalently Modified at Many Different Different Sites 222 Chromatin Acquires Additional Variety through the Site-Specific Insertion of a Small Set of Histone Variants 224 The Covalent Modifications Modifications and the Histone Variants Variants Act in Concert to Produce a “Histone Code”That Helps to Determine Biological Function 224 A Complex of Code-Reader and Code-Writer Proteins Can Spread Specific Chromatin Modifications for Long Distances Along a Chromosome 226 Barrier DNA Sequences Block the Spread of Reader–Writer Complexes and an d Th Ther ereb ebyy Sep Separ arat ate e Neig Neigh hbo bori rin ng Ch Chrom omat atin in Dom Domai ain ns 227 The Chromatin in Centromeres Centromeres Reveals How Histone Variants Variants Can Create Special Structures 228 Chromatin Structures Can Be Directly Inherited 230 Chromatin Structures Add Unique Features to Eucaryotic Chromosome Function 231 Summary 233



Chromosomes Ar Are Fo Folded in into La Large Lo Loops of of Ch Chromatin Polytene Chromosomes Are Uniquely Useful for Visualizing Chromatin Structures There Are Multiple Forms of Heterochromatin Heterochromatin Chromatin Loops Decondense When the Genes Within Them Are Expressed Chromatin Can Move to Specific Sites Within the Nucleus to Alter Their Gene Expression Networks of Macromolecules Form a Set of Distinct Biochemical Environments inside the Nucleus Mitotic Chromosomes Are Formed from Chromatin in Its Most Condensed State Summary




Genome Alterations Are Caused by Failures of the Normal Mechanisms for Copying and Maintaining DNA The Genome Sequences of Two Two Species Differ in Proportion to the Le Length of of Ti Time Th That Th They Ha Have Se Separately Ev Evolved Phylogenetic Trees Trees Constructed from a Comparison of DNA Sequences Trace the Relationships of All Organisms A Comparison of Human and Mouse Chromosomes Shows How the Structures of Genomes Diverge The Size of a Vertebrate Vertebrate Genome Reflects the Relative Rates of DNA Addition and DNA Loss in a Lineage We Can Can Re Reco cons nstr truct uct th the e Seq Seque uenc nce e of of Som Some e Anc Ancie ient nt Ge Geno nome mess Multispecies Sequence Comparisons Identify Important DNA Sequences of Unknown Function Accelerated Changes in Previously Conserved Sequences Can Help Decipher Critical Steps in Human Evolution Gene Duplication Provides an Important Source of Genetic Novelty During Evolution Duplicated Genes Diverge The Evolution of the Globin Gene Family Family Shows How DNA Dup upli lica cati tion onss Cont ntri ribu butte to th the e Evo volu luti tion on of Or Org gan anis isms ms Genes Encoding New Proteins Can Be Created by the Recombination of Exons Neutral Mutations Often Spread to Become Fixed in a Population, with a Pr Probability that De Depends on Population Size A Great Deal Can Be Learned from Analyses of the Variation Among Humans Summary Problems References

Chapter 5 DNA Replication, Repair, and Recombination

236 238 239 239 241 243 245

246 247 248 249 251 251 25 1 252 253 253 254 256 257 257 258 260 260 262




Mutation Rates Are Extremely Low Low Mutation Rates Ar Are Ne Necessar y for Life as as We Kn Know It Summary

263 265 265




Basee-P Pairing Underlies DNA Replication and DNA Repair The DNA Replication Fork Is Asymmetrical The High Fidelity of DNA Replication Requires Several Several Proofreading Mechanisms Only DNA Replication in the 5’-to-3’ Direction Allows Efficient Error Correction A Special Nucleotide-Polymerizing Enzyme Synthesizes Short RNA Primer Molecules on the Lagging Strand Special Proteins Help to Open Up the DNA Double Helix in Front of the Replication Fork

266 266

A Sli Slidi ding ng Ri Ring ng Ho Hold ldss a Mo Movi ving ng DN DNA A Pol Polym ymer eras ase e ont onto o the the DN DNA A The Proteins at a Replication Fork Fork Cooperate to Form a Replication Machine A Strand-Directed Mismatch Repair System Removes Replication Errors That Escape from the Replication Machine DNA Topo opoiso isomer merase asess Preve Prevent nt DNA DNA Tang anglin ling g Durin During g Repli Replicat cation ion DNA Replication Is Fundamentally Similar in Eucaryotes and Bacteria Summary

273 27 3


268 271 272 273

275 276 278 280 281


DNA Synthesis Begins at Replication Origins Bacterial Chromosomes Typically Have a Single Origin of DNA Replication Eucaryotic Eucary otic Chro Chromosom mosomes es Cont Contain ain Multi Multiple ple Orig Origins ins of Replic Replication ation In Eucaryotes DNA Replication Takes Place During Only One Part of the Cell Cycle


Different on the Same Chromosome Replicate at Distinct Times Regions in S Phase Highly Condensed Chromatin Replicates Late, While Genes in Less Condensed Chromatin Tend to Replicate Early Well-Defined DNA Sequences Serve as Replication Origins in a Simple Eucaryote, the Budding Yeast A Large Multisubunit Complex Binds to Eucaryotic Origins of Replication The Mammalian DNA Sequences That Specify the Initiation of Replication Have Been Difficult to Identify New Ne w Nucl Nucleo eoso some mess Are Are Asse Assemb mble led d Behi Behind nd the the Rep Replic licat atio ion n For Forkk The Mechanisms of Eucaryotic Chromosome Chromosome Duplication Ensure That Patterns of Histone Modification Modification Can Be Inherited Telomerase Replicates Replicates the Ends of Chromosomes Telomere Telomer e Length Is Regulated by Cells and Organisms Organisms Summary




Without DNA Repair, Spontaneous DNA Damage Would Rapidly Change DNA Sequences The DNA Double Helix Is Readily Repaired DNA DN A Dam Damag age e Can Can Be Rem emo oved by Mor More e Th Than an One Pat Path hway Coupling DNA Repair to Transcription Ensures That the Cell’s Most Important DNA Is Efficiently Repaired The Chemistry of the DNA Bases Facilitates Damage Damage Detection Speciall DNA Poly Specia Polymeras merases es Are Are Used in Emergen Emergencies cies to to Repair Repair DNA Double-Strand Breaks Are Efficiently Repaired DNA Damage Delays Progression of the Cell Cycle Summary

282 282 284

285 286 287 288 289 28 9 290 292 293 294

296 296 297 29 7 299 300 302 302 303 304



Homologous Recombination Has Many Uses in the Cell Homo Ho molo logo gous us Rec Recom ombi bina nati tion on Has Has Com Commo mon n Feat Featur ures es in in All All Cell Cellss DNA Base -P -Pairing Guides Homologous Recombination The RecA Protein and its Homologs Enable a DNA Single Strand Strand to Pai airr wit ith h a Hom Homol olog ogou ouss Re Reg gio ion n of DN DNA A Dou Doubl ble e Hel Helix ix Branch Migration Can Either Enlarge Hetroduplex Regions or

304 305 30 5 305

Release Newly Synthesized DNA as a Single Strand Homologous Recombination Can Flawlessly Repair DoubleStranded Breaks in DNA Cells Carefully Regulate the Use of Homologous Recombination in DNA Repair Holliday Junctions Are Often Formed During Homologous Recombination Events



308 310 311


Detailed Co Contents

Meiotic Recombination Begins with a Programmed DoubleStrand Break Homolo Hom ologou gouss Rec Recomb ombina inatio tion n Ofte Often n Resu Results lts in Gen Gene e Con Conver versio sion n Mismatch Proofreading Prevents Promiscuous Recombination Between Two Poorly Matched DNA Sequences Summary

312 314 315 316



Through Transposit Transposition, ion, Mobile Genetic Elements Can Insert Into Any DNA Sequence


DNA-Only Tr Move by Both Cut-and-Paste and Replicative 317 MechanTransposons isansposons ms Some Viruses Use a Transpo Transposition sition Mechanism to Move Themselves into Host Cell Chromosomes 319 Retroviral-like Retrotransposons Retrotransposons Resemble Retroviruses, but Lack a Protein Coat 320 A Large Fraction of the Human Genome Is Composed of Nonretroviral Retrotransposons 321 Different Transposable Transposable Elements Predominate in Different Organisms 322 Genome Sequences Reveal the Approximate Times that Transposable Elements Elements Have Moved 323 Conservative Site-Specific Recombination Can Reversibly Rearrange DNA 323 Conservative Site-Specific Recombination Was Discovered in Bacteriophage l 324 Conservative Site-Specific Recombination Can Be Used to Turn Genes On or Off 324 Summary 326 Problems 327 References 328

Chapter 6 How Cells Read the Genome: From DNA to Protein




Portions of DNA Sequence Are Transcribed into RNA Transcription Transcr iption Produces RNA Complementary Complementary to One Strand of DNA Cells Produce Several Types of RNA Signals Encoded in DNA Tell RNA Polymerase Where to Start and Stop Transcription Transcr iption Start and Stop Signals Are Heterogeneous in Nucleotide Sequence Transcription Transcr iption Initiation in Eucaryotes Requires Many Many Proteins RNA Pol olyyme mera rasse II Req equi uirres Ge Gen ner era al Tran ansc scrrip ipti tion on Fact ctor orss Polymerase II Also Requires Activator, Mediator, Mediator, and ChromatinModifying Proteins Transcription Transcr iption Elongation Produces Superhelical Superhelical Tension Tension in DNA Transcription Transcr iption Elongation in Eucaryotes Is Tightly Coupled to RNA Processing RNA RN A Capp Capping ing Is the Fir First st Mod Modifi ificat cation ion of Euc Eucary aryoti oticc PrePre-mRN mRNAs As RNA Splicing Removes Intron I ntron Sequences from Newly Transcribed Pre-mRNAs Nucleotide Se Sequences Signal Where Sp Splicing Occurs RNA Splicing Is Per formed by the Spliceosome The Spliceosome Uses ATP ATP Hydrolysis to Produce a Complex Series of RNA–RNA Rearrangements Other Properties of Pre-mRNA and Its Synthesis Help to Explain the Choice of Proper Splice Sites A Second Set of snRNPs Splice a Small Fraction of Intron Sequences in Animals and Plants RNA Splicing Shows Remarkable Plasticity Spliceosome-Catalyzed RNA Splicing Probably Evolved from Self-Splicing Mechanisms RNA-Processing RNA-Proc essing Enzymes Generate the 3 ¢ End of Eucary Eucaryotic otic mRNA mRNAss Mature Eucaryotic mRNAs Are Selectively Exported from the Nucleus Many Noncoding RNAs Are Also Synthesized and Processed in the Nucleus The Nucleolus Is a Ribosome-Producing Factory The Nucleus Contains a Variety Variety of Subnuclear Structures Summary

332 333 335 336 338 339 340 342 343 345 346 347 349 349 351 352 353 355 355 357 358 360 362 363 366



An mR mRN NA Seq Sequ uen encce Is Is Dec Decod oded ed in Se Setts of of Th Three Nu Nuccle leot otid ide e tRNA Molecules Ma Match Amino Ac Acids to to Co Codons in in mRNA tRNAss Are tRNA Are Covalen Covalently tly Modifi Modified ed Befor Before e They They Exit from the Nucleus Nucleus Specific Enzymes Couple Each Amino Acid to Its I ts Appropriate tRNA Molecule Editing by RNA Synthetases Ensures Accuracy Amino Acids Are Added to the C-terminal End of a Growing Polypeptide Chain The RNA Message Is Decoded in Ribosomes Elongation Factors Drive Translation Forward and Improve Its

367 367 368 369

Accuracy The Ribosome Is a Ribozyme Nucleotide Sequences in mRNA Signal Where to Start Protein Synthesis Stop Codons Mark the End of Translation Proteins Are Made on Polyribosomes There Are Minor Variations Variations in the Standard Genetic Code Code Inhibitors of Procaryotic Protein Synthesis Are Useful as Antibiotics Accur Ac curacy acy in in Tran Transla slatio tion n Requir Requires es the the Expend Expenditu iture re of Fre Free e Energ Energyy Quality Control Mechanisms Act to Prevent Translation Translation of Damaged mRNAs Some So me Prot otei ein ns Beg Begin in to Fol old d Wh Whil ile e Sti Still ll Be Bein ing g Synt nthe hessiz ized ed Molecu Mol ecular lar Cha Chaper perone oness Help Help Guid Guide e the the Fold Folding ing of Mos Mostt Prot Protein einss Exposed Hydrophobic Regions Provide Critical Signals for Protein Quality Control The Proteasome Is a Compartmentalized Protease Protease with Sequestered Active Sites

377 378

An Elaborate System Marks Proteins for DestructioUbiquitin-Conjugating n

393 395

Many Proteins Are Controlled by Regulated Destruction Abnormally Folded Proteins Can Aggregate to Cause Destructive Human Diseases There Are Many Steps Steps From DNA to Protein Summary

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Life Requires Stored Information Polynucleotides Can Both Store Information and Catalyze Chemical Reactions A Pre-RNA World May Predate the RNA World Single-Stranded RNA Molecules Can Fold into Highly H ighly Elaborate Structures Self-Replicating Molecules Undergo Natural Selection How Did Protein Synthesis Evolve? Alll Pr Al Pres esen entt-Da Dayy Cel Cells ls Use DNA as Th Thei eirr Her Hered edit itar aryy Mat Mater eria iall Summary Problems References


Chapter 7 Control of Gene Expression AN OVERVIEW OF GENE CONTROL The Different Cell Types of a Multicellular Organism Organism Contain the Same DNA Different Ce Cell Ty Types Sy Synthesize Di Different Se Sets of of Pr Proteins External Signals Can Cause a Cell to Change the Expression of Its Genes Gene Expression Can Be Regulated at Many of the Steps in the Pathway from DNA to RNA to Protein Summary

DNADN A-BI BIND NDIN ING G MOTI MOTIFS FS IN IN GENE GENE REG REGUL ULA ATO TORY RY PRO PROTE TEIN INS S Gene Regulatory Proteins Were Discovered Using Bacterial Genetics The Outside of the DNA Helix Can Be Read by Proteins Short DNA Sequences Are Fundamental Components of Genetic Switches Gene Regulatory Proteins Contain Structural Motifs That Can Read DNA Sequences The Helix–Turn–Helix Helix–Turn–Helix Motif Is One of the Simplest and Most Common DNA-Binding Motifs

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Detailed Contents

Homeodomain Proteins Constitute a Special Class of Helix–Turn– Helix–Turn– Helix Proteins There Are Several Types Types of DNA-Binding Zinc Finger Finger Motifs b sheets Can Also Recognize DNA Some Proteins Use Loops That Enter the Major and Minor Groove to Recognize DNA The Leucine Zipper Motif Mediates Both DNA Binding Binding and Protein Dimerization Heterodimerization Expands the Repertoire of DNA Sequences That Gene Regulatory Proteins Can Recognize The Helix–Loop–Helix Motif Also Mediates Dimerization and and DNA Binding It Is Not Yet Yet Possible to Predict the DNA Sequences Recognized by All Gene Regulatory Proteins A Gel-Mobility Shift Assay Readily Detects Sequence-Specific DNA-Binding Proteins DNA Affinity Chromatography Facilitates the Purification of Sequence-Specific DNA-Binding Proteins The DNA Sequence Recognized Recognized by a Gene Regulatory Protein Can Be Determined Experimentally Phylogenetic Footprinting Footprinting Identifies DNA Regulatory Sequences Through Comparative Comparative Genomics Chromatin Immunoprecipitation Identifies Many of the Sites That Gene Regulatory Proteins Proteins Occupy in Living Cells Summary

HOW GENETIC SWITCHES WORK The Tryptophan Tryptophan Repressor Is a Simple Switch That Turns Turns Genes On and Off in Bacteria Transcriptional Transcr iptional Activators Turn Turn Genes On A Transcriptional Activator and a Transcriptional Repressor Control the Lac LacO Operon DNA Looping Occurs During Bacterial Gene Regulation Bacteria Use Interchangeable RNA Polymerase Subunits to Help Regulate Gene Transcription Complex Switches Have Evolved to Control Gene Transcription in Eucar yotes A Eucaryotic Gene Control Region Consists of a Promoter Plus Regulatory DNA Sequences Eucaryotic Gene Activator Proteins Promote the Assembly of RNA Polymerase and the General Transcription Factors at the Startpoint of Transcription Eucaryotic Gene Activator Proteins Also Modify Local Chromatin Structure Gene Activator Proteins Work Synergistically Eucaryotic Gene Repressor Proteins Can Inhibit Transcription in Various Ways Eucaryotic Gene Regulatory Proteins Often Bind DNA Cooperatively Complex Genetic Switches That Regulate Drosophila Development Are Built Up from Smaller Modules The Drosophila Eve Gen Gene e Is Is Regu Regulat lated ed by Com Combin binato atoria riall Cont Contro rols ls Complex Mammalian Gene Control Regions Are Also Constructed from Simple Regulatory Modules Insulators Are DNA Sequences That Prevent Eucaryotic Gene Regulatory Proteins from Influencing Distant Genes Gene Switches Rapidly Evolve Summary

THE MOLECULAR GENETIC MECHANISMS THA THAT T CREATE CREATE SPECIALIZED CELL TYPES DNA Rea DNA earrra rang ngem emen ents ts Med edia iatte Ph Phas ase e Vari riat atio ion n in Bac actter eria ia A Set of Gene Regulatory Proteins Determines Cell Type Type in a Budding Yeast Two Proteins Proteins That Repress Repress Each Other’s Synthesis Synthesis Determine the Heritable State of Bacteriophage Lambda Simple Gene Regulatory Circuits Can Be Used to Make Memory Devices Transcript Tra nscriptional ional Circuits Circuits Allow Allow the Cell Cell to Carry Carry Out Logic Logic Operations Operations Synthetic Synth etic Biology Creates Creates New Devices Devices from Existing Existing Biological Biological Parts Circadian Circ adian Clocks Clocks Are Based Based on Feedback Feedback Loops Loops in Gene Regulatio Regulation n A Single Gene Regulatory Protein Can Coordinate the Expression of a Set of Genes


Expression of a Critical Gene Regulatory Protein Can Trigger the th e Exp Expre ress ssio ion n of of a Wh Whol ole e Bat Batte tery ry of Do Down wnst stre ream am Ge Gene ness Combinatorial Gene Control Creates Many Different Cell Types in Eucaryotes A Single Gene Regulatory Protein Can Trigger the Formation of an Entire Organ The Pattern of DNA Methylation Methylation Can Be Inherited When When Vertebrate Cells Divide Genomic Imprinting Is Based on DNA Methylation CG-Rich Islands Are Associated with Many Genes in Mammals Epigenetic Mechanisms Ensure That Stable Patterns of Gen Ge ne Ex Expr pres essi sio on Can Be Tran ansm smit itte ted d to Da Daug ugh hter Cel ells ls Chromosome-Wide Alterations in Chromatin Structure Can Be Inherited The Control of Gene Expression is Intrinsically Intrinsically Noisy Summary



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Transcription Attenuation Causes the Premature Transcription Premature Termination Termination of Some RNA Molecules Ribo Ri bosw swit itch ches es Mig Might ht Rep Repre rese sent nt Anc Ancie ient nt For Forms ms of of Gene Gene Con Contr trol ol Alternative RNA Splicing Can Produce Different Forms of a Protein from the Same Gene The Definition of a Gene Has Had to Be Modified Since the Discovery of Alternative RNA Splicing Sex Determination in Drosophila Depends on a Regulated Series of RNA Splicing Events A Change in the Site of RNA Transcript Cleavage and Poly-A Addition Can Change the C-terminus of a Protein RNA Ed Edit itin ing g Can Can Ch Chan ang ge th the Mea Mean nin ing g of of the the RN RNA A Mes Messsag age e RNA Transport from the Nucleus Can Be Regulated Some Som e mRNAs mRNAs Are Are Locali Localized zed to to Specif Specific ic Regio Regions ns of the the Cytop Cytoplas lasm m The 5’ and 3’ Untranslated Regions Regions of mRNAs Control Their Translation Translation The Phosphorylation of an Initiation Factor Factor Regulates Protein Synthesis Globally Initiation at AUG Codons Upstream of the Translation Translation Start Can Regulate Eucaryotic Translation Initiation Internal Ribosome Entry Sites Provide Opportunities for Translation Translati on Control Chan Ch ange gess in mR mRNA NA St Sta abi bili lity ty Can Re Regu gula latte Ge Gen ne Ex Expr pres essi sion on Cytoplasmic Poly-A Addition Can Regulate Translation Small Noncoding RNA Transcripts Regulate Many Animal and Plant Genes RNA Interference Is a Cell Defense Mechanism RNA In Inter fe ference Ca Can Di Direc t Heterochromatin Fo Formation RNA RN A Int Inter erfe fere renc nce e Has Has Be Beco come me a Pow Power erfu full Exp Exper erim imen enta tall Too ooll Summary Problems References


463 46 3 464 465 467 468 470 471 47 1 473 476 477

477 477 478 47 8 479 480 481 482 483 48 3 485 486 488 488 489 491 492 49 2 493 493 495 496 497 49 7 497 497 499

447 448

Chapter Chapt er 8 Manipulati Manipulating ng Proteins Proteins,, DNA, and and RNA 501



501 502 502


Cells Can Be Isolated from Intact Tissues Cells Can Be Grown in Culture Eucaryotic Cell Lines Are a Widely Used Source of Homogeneous Cells Embryonic Stem Ce Cells Co Could Re Revolutionize Me Medicine Somatic Cell Nuclear Transplantation Transplantation May Provide a Way to Generate Personalized Stem Cells Hybridoma Cell Lines Are Factories That Produce Monoclonal Antibodies Summary




Cells Can Be Separated into Their Component Fractions Cell Extracts Provide Accessible Systems to Study Cell Functions Proteins Can Be Separated by Chromatograph Chromatographyy Affinity Chromatography Chromatography Exploits Specific Binding Sites on Proteins Genetically-Engineered Tags Provide an Easy Way to Purify Proteins

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Detailed Contents

Purified Cell-Free Systems Are Required for the Precise Dissection of Molecular Functions 516 Summary 516

ANALYZING PROTEINS Proteins Can Be Separated by SDS Polyacrylamide-Gel Electrophoresis Spec Sp ecif ific ic Pro Prote tein inss Can Can Be De Dete tect cted ed by by Blot Blotti ting ng wi with th Ant Antib ibod odie iess Mass Spectrometry Provides a Highly H ighly Sensitive Method for Identifying Unknown Proteins Two-Dimensional Two-Dimen sional Separation Methods are Especially Powerful Powerful

517 517 518 51 8 519 521

Hydrodynamic Reveal the Size and Shape of a Protein CoMeasurements mplex Sets of Interacting Proteins Can Be Identified by Biochemical Methods Protein–Protein Protein–Pr otein Interactions Can Also Be Identified by a Two-Hybrid Techn Technique ique in Yeast Yeast Combining Data Derived from Different Techniques Techniques Produces Reliable Protein-Interaction Maps Optica Opt icall Meth Methods ods Can Mon Monito itorr Pro Protei tein n Int Intera eracti ctions ons in Rea Reall Tim Time e Some Techniques Can Monitor Single Molecules Protein Function Can Be Selectively Disrupted with Small Molecules Prot Pr otei ein n Str Struc uctu ture re Ca Can n Be Be Det Deter ermi mine ned d Usi Using ng XX-Ra Rayy Dif Diffr frac acti tion on NMR NM R Ca Can n Be Us Used ed to De Dete term rmin ine e Pro Prote tein in St Stru ructu cture re in So Solu luti tion on Protein Sequence and Structure Provide Clues About Protein Function Summary




Restriction Nucleases Cut Large DNA Molecules into Fragments Gel Electrophoresis Separates DNA Molecules of Different Sizes Purified DNA Molecules Can Be Specifically Labeled with Radioisotopes or Chemical Markers in vitro Nucleic Acid Hybridization Reactions Provide a Sensitive Way of Detecting Specific Nucleotide Sequences Northern and Southern Blotting Facilitate Hybridization with Elec tr trophoretical ly ly Se Separated Nu Nucleic Ac Acid Mo Molecules Genes Can Be Cloned Using DNA Libraries Two Types of DNA Libraries Serve Different Different Purposes cDNA Clones Contain Uninterrupted Coding Sequences Genes Can Be Selectively Amplified by PCR Cell Ce llss Ca Can n Be Us Used ed As Fac acto tori ries es to Pr Prod oduc uce e Sp Spec ecif ific ic Pr Prot otei eins ns Proteins and Nucleic Acids Can Be Synthesized Directly by Chemical Reactions DNA Can Be Rapidly Sequenced Nucleotide Sequences Are Used to Predict the Amino Acid Sequences of Proteins The Genomes of Many Organisms Organisms Have Been Fully Sequenced Summary

532 534



Classical Genetics Begins by Disrupting a Cell Process by Random Mutagenesis Gene Ge neti ticc Scr Scree eens ns Ide Ident ntif ifyy Mut Mutan ants ts wi with th Sp Spec ecif ific ic Ab Abno norm rmal alit itie iess Mutations Can Cause Loss or Gain of Protein Function Complementation Tests Tests Reveal Whether Two Mutations Are in the Same Gene or Different Genes Genes Can Be Ordered in Pathways by Epistasis Analysis Genes Identified by Mutations Can Be Cloned Human Genetics Presents Special Problems and Special Opportunities Human Genes Are Inherited i n Haplotype Blocks, Which Can Aid in the Search for Mutations That Cause Disease Complex Traits Are Influenced by Multiple Genes Reverse Genetics Begins with a Known Gene and Determines Which Cell Processes Require Its Function Genes Can Be Re-Engineered in Several Ways Engineered Genes Can Be Inserted into the Germ Line of Many Organisms Animals Can Be Genetically Altered Transgenic Transg enic Plants Are Important for Both Cell Biology and Agriculture

Large Collections of Tagged Knockouts Provide a Tool for Examining th the Fu Function of of Ev Ever y Gene in in an an Or Organism RNA Interfer Interference ence Is a Simple Simple and Rapid Rapid Way Way to Test Test Gene Functi Function on Reporter Genes and In Situ Hybridization Reveal When and Where a Gene Is Expressed Expression of Individual Genes Can Be Measured Using Quantitative RT-PCR Microarrays Monitor the Expression of Thousands of Genes at Once SingleSin gle-Cel Celll Gene Gene Exp Expres ressio sion n Anal Analysi ysiss Reve Reveals als Bio Biolog logica icall “No “Noise ise”” Summary Problems References

569 571 572 573 574 575 576 576 578


Chapter 9 Visualizing Cells




The Light Microscope Can Resolve Resolve Details 0.2 mm Apart Living Cells Are Seen Clearly in a Phase-Contrast or a DifferentialInterference-Contrast Microscope Image Ima gess Can Can Be En Enha hanc nced ed an and d Ana Analy lyze zed d by by Dig Digit ital al Tec echn hniq ique uess Intact Tissu Tissues es Are Are Usually Usually Fix Fixed ed and and Sectioned Sectioned befo before re Micros Microscopy copy Specific Molecules Can Be Located in Cells by Fluorescence Microscopy Antibodies Can Be Used to Detect Specific Molecules Imaging of Complex Three-Dimensional Objects Is Possible with the Optical Microscope The Confocal Microscope Microscope Produces Optical Sections by Excluding Out-of-Focus Light


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Fluorescent Proteins Can Be Used to Tag Individual Proteins in Living Cells and Organisms Protein Dynamics Can Be Followed in Living Cells Light-Emitting Indicators Can Measure Rapidly Changing Intracellular Ion Concentration Concentrationss Several Strategies Are Available by Which Membrane-Impermeant Substances Can Be Introduced into Cells Light Can Be Used to Manipulate Microscopic Objects As Well As to Image Them Single Molecules Can Be Visualized by Using Total Total Internal Reflection Fluorescence Microscopy Individual Molecules Can Be Touched and Moved Using Atomic Force Microscopy Molecules Can Be Labeled with Radioisotopes Radioisoto Radio isotopes pes Are Used Used to Trace Trace Molecules Molecules in Cells Cells and Organisms Organisms Summary

592 593 596 597 598 599 600 600 602 603



The Electron Microscope Resolves the Fine Fine Structure of the Cell Biological Specimens Require Special Preparation for the Electron Microscope Specific Macromolecules Can Be Localized by Immunogold Electron Microscopy Images of Surfaces Can Be Obtained by Scanning Electron Microscopy Metal Shadowing Allows Surface Features to Be Examined at Hig Hi gh Re Resolution by by Transmission El Elec tr tron Mi Microscopy Negative Staining and Cryoelectron Microscopy Both Allow Macromolecules to Be Viewed at High Resolution Mul ulti tipl ple e Im Imag ages es Can Be Comb mbin ined ed to In Inccrea ease se Res esol olut utio ion n Different Views Views of a Single Object Can Be Combined to Give a Three-Dimensional Reconstruction Reconstruction Summary Problems References

Chapter 10 Membrane Structure

604 605 606 607 608 610 610 61 0 612 612 614 615




Phosphoglycerides, Sphingolipids, and Sterols Are the Major Phosphoglycerides, Lipids in Cell Membranes Phospholipids Spontaneously Form Bilayers

618 620

Detailed Contents

The Lipid Bilayer Is a Two-Dimensional Two-Dimensional Fluid The Fluidity of a Lipid Bilayer Depends on Its Composition Despite Their Fluidity, Lipid Bilayers Can Form Domains of Different Compositions Lipi Li pid d Drop Drople lets ts Ar Are e Sur Surro roun unde ded d by a Pho Phosp spho holi lipi pid d Mono Monola layyer The Asymmetry of the Lipid Bilayer Is Functionally Functionally Important Glycol Gly colipi ipids ds Are Fou Found nd on the Surf Surface ace of All Pla Plasma sma Mem Membra branes nes Summary

(Video) #NERDY​ Networking 05 - Dr Richard Ivry: Cognitive Neuroscience in the Classroom

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Membrane Proteins Can Be Associated with the Lipid Bilayer in VaAnchors rious WaControl ys Lipid the Membrane Localization of Some Signaling Proteins In Most Transmembrane Proteins the Polypeptide Chain Crosses the Lipid Bilayer in an a-Helical Conformation Transmembrane Transmem brane a Helices Often In Intterac t with One Another Some b Barrels Form Large Transmembran Transmembrane e Channels Many Membrane Proteins Are Glycosylated Membrane Membr ane Protein Proteinss Can Be Be Solubilized Solubilized and and Purified Purified in in Detergent Detergentss Bacteriorhodopsin Is a Light-Driven Proton Pump That Traverses Traverses the Lipid Bilayer as Seven a Helices Membrane Proteins Often Function as Large Complexes Manyy Membr Man Membrane ane Pr Prote oteins ins Dif Diffus fuse e in the the Plan Plane e of the the Memb Membran rane e Cells Can Confine Proteins and Lipids to Specific Domains Within a Membrane The Cortical Cytoskeleton Gives Gives Membranes Mechanical Strength Strength and Restrict Membrane Protein Diffusion Summary Problems References

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All Eucaryotic Cells Have the Same Basic Set of MembraneEnclosed Organelles Evolutionary Origins Explain the Topological Relationships of




Protei Prot einn-F Fre ree e Li Lipi pid d Bi Bila laye yers rs Ar Are e Hi High ghly ly Im Impe perm rmea eabl ble e to Io Ions ns There Are Two Two Main Classes of Membrane Transport Proteins: Proteins: Transporters and and Channels Active Transport Transport Is Mediated by Transporters Coupled to an Energy Source Summary

652 65 2



Active Transport Can Be Driven by Ion Gradients Transporters in the the Plasma Membrane Regulate Cytosolic pH An Asymmetric Distribution of Transporters in Epithelial Cells Underlies the Transcellular Transport of Solutes There Are Three Three Classes of ATP-Driven ATP-Driven Pumps The Ca2+ Pump Is the Best-Understood P-type ATPase The Plasma Membrane P-type Na+-K+ Pump Establishes the Na+ Gradient Across the Plasma Membrane ABC Transporters Constitute the Largest Family of Membrane Transport Proteins Proteins Summary

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Ion Channels Are Ion-Selective and Fluctuate Between Open and Closed States 667 The Membrane Potential in Animal Animal Cells Depends Mainly on K+ Leak Channels and the K+ Gr Grad adie ient nt Ac Acro ross ss the the Pl Plas asma ma Me Memb mbra rane ne 669 66 9 The Resting Potential Potential Decays Only Slowly When When the Na+-K+ Pump Is Stopped 669 The Three-Dimensional Three-Dimensional Structure of a Bacterial K+ Channel Shows How an Ion Channel Can Work Aquapo Aqua pori rins ns Ar Are e Per Perme meab able le to Wa Wate terr But But Im Impe perm rmea eabl ble e to to Ion Ionss The Function of a Neuron Depends on Its Elongated Structure Structure Voltage-Gated Cation Channels Generate Action Potentials in Electrically Excitable Cells Myelination Increases the Speed and Efficiency of Action Potential Propagation in Nerve Cells

Chapter 12 Intracellular Compartments and Protein Sorting



Chapter 11 Membrane Transport of Small Molecules and an d th the e El Ele ect ctri rica call Pro rope pert rtie iess of Me Mem mbr bran anes es 651 65 1


Patch-Clamp Recording Indicates That Individual Gated Channels Open in an All-or-Nothing Fashion Voltage-Gated Cation Channels Are Evolutionarily and Structurally Related Transmitter-Gated Transmitt er-Gated Ion Channels Convert Convert Chemical Signals into Electrical Ones at Chemical Synapses Chemical Synapses Can Be Excitatory or Inhibitory The Acetylcholine Receptors Receptors at the Neuromuscular Junction Are Transmitter-Gated Transmitt er-Gated Cation Channels Transmitter-Gated Transmitt er-Gated Ion Channels Are Major Targ Targets ets for Psychoactive Psychoactive Drugs Neuromuscular Transmission Transmission Involves the Sequential Activation of Five Different Sets of Ion Channels Single Neurons Are Complex Computation Devices Neuronal Computation Requires a Combination of at Least Three Kinds of K+ Channels Long-Term Potentiation (LTP) in the Mammalian Hippocampus Depends on Ca2+ En Entr try y Th Thro roug ugh h NMD NMDAA-Re Rece cept ptor or Ch Chan anne nels ls Summary Problems References


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Organelles Protei Prot eins ns Ca Can n Mov Move e Bet Betwe ween en Co Comp mpart artme ment ntss in in Dif Diffe fere rent nt Wa Ways ys Sign Si gnal al Seq Seque uenc nces es Dir Direc ectt Pro Prote tein inss to to the the Cor Corrrec ectt Cel Celll Add Addre ress ss Most Organelles Cannot Be Constructed De Novo: Novo: They Require Information in the Organelle Itself Summary


697 699 69 9 701 70 1 702 704


Nucl ea ear Pore Complexes Per fo forate the Nuclear Envelope Nuclearr Localization Nuclea Localization Signals Signals Direct Direct Nuclear Nuclear Proteins Proteins to the Nucleus Nuclear Import Receptors Bind to Both Nuclear Localization Signals and NPC proteins Nuclear Ex Expor t Works Li Like Nu Nuclear Im Impor t,t, Bu But in in Re Reverse The Ran GTPase Imposes Directionality on Transport Transport Through Through NPCs Transport Through Through NPCs Can Be Regulated by Controlling Controlling Access to the Transport Machinery

705 705

During Mitosis the Nuclear Envelope Disassembles Summary

710 712



Translocation into into Mitochondria Depends on Signal Signal Sequences and Protein Translocators Mitochondrial Precursor Proteins Are Imported as Unfolded Polypeptide Chains ATP Hydrolysis Hydrolysis and a Membrane Potential Drive Protein Import Into the Matrix Space Bacteria and Mitochondria Use Similar Mechanisms to Insert Porins into their Outer Membrane Transport Into the Inner Mitochondrial Mitochondrial Membrane and Intermembrane Space Occurs Via Several Routes Two Signal Signal Sequences Direct Proteins to the Thylakoid Thylakoid Membrane in Chloroplasts Summary

PEROXISOMES Peroxisomes Use Molecular Oxygen and Hydrogen Peroxide to Per form Oxidative Reactions A Short Signal Sequence Directs the Impor t of Proteins into Peroxisomes Summary

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Detailed Contents



The ER Is Structurally and Functionally Functionally Diverse Signal Sequences Were First Discovered in Proteins Imported into the Rough ER A Signal-Recognition Particle (SRP) Directs ER Signal Sequences to a Specific Receptor in the Rough ER Membrane The Polypeptide Chain Passes Passes Through Through an Aqueous Pore in the Translocator Translocat or Translocation Transloc ation Across the ER Membrane Does Not Always Always Require Ongoing Polypeptide Chain Elongation In Single-Pass Transmembrane Proteins, a Single Internal ER Signal

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Sequence Remains in the Lipid Bilayer as a Membrane-Spanning a Helix Combinations of Start-Transfer and Stop-Transfer Signals Determine the Topology of Multipass Transmembrane Proteins Translocated Transloc ated Polypeptide Chains Fold and Assemble Assemble in the Lumen of the Rough ER Most Proteins Synthesized in the Rough ER Are Glycosylated by the Addition of a Common N-Linked Oligosaccharide Oligosaccharides Are Used as Tags to Mark the State of Protein Folding Improperly Folded Proteins Are Exported from the ER and Degraded in the Cytosol Misfolded Proteins in the ER Activate an Unfolded Protein Response Some Membrane Proteins Acquire a Covalently Attached Glycosylphosphatidylinositol Glycosylphosphat idylinositol (GPI) Anchor The ER Assembles Most Lipid Bilayers Bilayers Summary Problems References

Chapter 13 Intracellular Vesicular Traffic THE MOLECULAR MECHANISMS OF MEMBRANE MEMBRANE TRANSPORT AND THE MAINTENANCE OF COMPARTMENTAL DIVERSITY There Are Various Various Types Types of Coated Vesicles Vesicles The Assembly of a Clathrin Coat Drives Vesicle Formation Not All Coats Form Basket-like Structures Phos Ph osph phoi oino nosi siti tide dess Mark Mark Org Organ anel elle less and and Memb Membra rane ne Dom Domai ains ns Cytoplasmic Proteins Regulate the Pinching-Off and Uncoating of Coated Vesicles Monomeric GTPases Control Coat Assembly Not All Transport Vesicles Are Spherical Rab Proteins Guide Vesicle Targeting SNAREs Mediate Membrane Fusion Interacting SNAREs Need to Be Pried Apart Before They Can Function Again Viral Fusion Proteins and SNAREs May Use Similar Fusion Mechanisms Summary

TRANSPORT FROM THE ER THROUGH THE THE GOLGI APPARATUS Proteins Le Leave th the ER ER in in CO COPII II--Coated Tr Transpor t Vesicles Only Proteins That Are Properly Folded and Assembled Can Leave the ER Vesicular Tubular Tubular Clusters Mediate Transport from the ER to the Golgi Apparatus The Retrieval Pathway Pathway to the ER Uses Sorting Signals Many Proteins Are Selectively Retained in the Compartments in Which They Function The Golgi Apparatus Consists of an Ordered Ordered Series of Compartments Olig Ol igos osac acch char arid ide e Cha Chain inss Are Are Pr Proc oces esse sed d in in the the Go Golg lgii App Appar arat atus us Proteoglycans Are Assembled in the Golgi Apparatus What Is the Purpose of Glycosylation? Transport Through the Golgi Apparatus May Occur Occur by Vesicular Vesicular Transport Transpo rt or Cisternal Maturation Golgi Matrix Proteins Help Organize the Stack Summary

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TRANSPORT FROM THE TRANS GOLGI NETWORK TO LYSOSOMES LYSOSOMES Lys ysos osom omes es Ar Are e th the e Pr Prin inci cipa pall Si Site tess of In Intr trac acel ellu lula larr Di Dige gest stio ion n Lysosomes Are Heterogeneous Plant Pla nt and and Fung Fungal al Va Vacuo cuoles les Are Rem Remark arkabl ablyy Vers Versati atile le Lyso Lysosom somes es Multiple Pathways Deliver Materials to Lysosomes A Mannose 6-Phosphate Receptor Recognizes Lysosomal Proteins in the Trans Golgi Network The M6P Receptor Shuttles Between Specific Specific Membranes A Signal Patch in the Hydrolase Polypeptide Chain Provides the Cue for M6P Addition

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Defects in the GlcNAc Phosphotransferase Phosphotransferase Cause a Lysosomal Storage Disease in Humans Some Lysosomes Undergo Exocytosis Summary

785 786 786



Specialized Ph Phagocytic Ce Cells Ca Can In Ingest La Large Pa Particles Pinocytic Pino cytic Ves Vesicles icles Form Form from from Coated Coated Pits in the the Plasma Membran Membrane e Not All Pinocytic Vesicles Are Clathrin-Coated Cells Use Receptor-Mediated Endocytosis to Import Selected Extracellular Macromolecules Endocytosed Materials That Are Not Retrieved from Endosomes End Up in Lysosomes Specific Proteins Are Retrieved from Early Endosomes and Returned to the Plasma Membrane Multiv Mul tivesi esicul cular ar Bod Bodies ies Fo Form rm on the Pa Path thway way to Lat Late e Endo Endosom somes es Transcytosis Transcytos is Transfers Transfers Macromolecules Across Across Epithelial

787 789 790

Cell Sheets Epithelial Cells Have Two Distinct Early Endosomal Compartments but a Common Late Endosomal Compartment Summary




Many Proteins and Lipids Seem to Be Carried Automatically from the Golgi Apparatus to the Cell Surface Secretory Vesicles Bud from the Trans Golgi Network Proteins Are Often Proteolytically Processed During the Formation of Secretory Vesicles Secretory Vesicles Wait Wait Near the Plasma Membrane Until Signaled to Release Their Contents Regulated Exocytosis Can Be a Localized Response of the Plasma Membrane and Its Underlying Cytoplasm Secretory Vesicle Membrane Components Are Quickly Removed from the Plasma Membrane

791 792 793 795

798 799

799 800 801 803 803 804 805

Some MeRegulated mbrane Exocytosis Events Serve to Enlarge the Plasma 805 Polarized Cells Direct Proteins from the Trans Golgi Network to the Appropriate Domain of the Plasma Membrane 805 Different Strategies Guide Membrane Proteins and Lipids Selectively to the Correct Plasma Membrane Domains 806 Syna Sy napt ptic ic Ves esic icle less Can Can For orm m Dir Direc ectl tlyy fro from m End Endoc ocyt ytic ic Ves esic icle less 807 80 7 Summary 809 Problems 810 References 812

Chapter 14 Energy Conversion: Mitochondria and Chloroplasts




The Mitochondrion Contains Contains an Outer Membrane, an Inner Membrane, and Two Internal Compartments The Citric Acid Cycle Generates Generates High-Energy Electrons Electrons

816 817

A Che Chemi mios osmo moti ticc Pro Proce cess ss Co Conv nvert ertss Oxi Oxida dati tion on En Ener ergy gy in into to ATP NADH Transfers its Electrons to Oxygen Through Three Large Respiratory Enzyme Complexes As Electrons Move Along the Respiratory Chain, Energy Is Stored as an Electrochemical Proton Gradient Across the Inner I nner Membrane The Proton Gradient Gradient Drives ATP Synthesis Synthesis

817 81 7 819

820 821

Detailed Contents

The Proton Gradient Gradient Drives Coupled Transport Transport Across the Inner Membrane Proton Gradients Produce Most of the Cell’s ATP Mitochondria Maintain a High ATP:ADP Ratio in Cells A Large Negative Value of DG for ATP Hydrolysis Makes ATP Useful to the Cell ATP Synthase Can Function in Reverse to Hydrolyze ATP and Pump H+ Summary


822 822 823 824 826 827


Protons Are Unusually Easy to Move 827 The Redox Potential Potential Is a Measure of Electron Affinities 828 Electron Transfers Release Large Amounts of Energy 829 Spectroscopic Methods Identified Many Electron Carriers in the Respiratory Chain 829 The Respiratory Chain Includes Three Three Large Enzyme Complexes Embedded in the Inner Membrane 831 An Iron–Copper Center in Cytochrome Oxidase Catalyzes Efficient O2 Reduction 832 Electron Transfers Transfers in the Inner Mitochondrial Membrane Are Mediated by Electron Tunneling during Random Collisions 834 A Large Drop in Redox Potential Across Each of the Three Respiratory Enzyme Complexes Provides the Energy for H + Pumping 835 The H+ Pumping Occurs by Distinct Mechanisms in the Three Major Enzyme Complexes 835 H+ Ion Ionoph ophore oress Uncou Uncouple ple Elect Electro ron n Tran Transpo sport rt from from ATP ATP Synt Synthes hesis is 836 Respiratory Control Normally Restrains Electron Flow Through the Chain 837 Natural Uncouplers Convert the Mitochondria in Brown Fat into Heat-Generating Machines 838 The Mitochondrion Plays Plays Many Critical Roles in Cell Metabolism 838 Bacteria Also Exploit Chemiosmotic Mechanisms to Harness Energy 839 Summary 840

CHLOROPLASTS AND PHOTOSYNTHESIS The Chloroplast Is One Member of the Plastid Family of Organelles Chloroplasts Resemble Mitochondria But Have an Extra Compartment Chloroplasts Capture Energy from Sunlight Sunlight and Use It to Fix Carbon Carbon Fixation Is Catalyzed by Ribulose Bisphosphate Carboxylase Each CO2 Molecule That Is Fixed Consumes Three Molecules of ATP and Two Molecu Molecules les of NADPH Carbon Fixation in Some Plants Is Compartmentalized to Facilitate Growth at Low CO 2 Concentrations Photosynthesis Depends on the Photochemistry of Chlorophyll Molecules A Photochemical Reaction Center Plus an Antenna Complex Form a Photosystem In a Reaction Center, Light Energy Captured by Chlorophyll Chlorophyll Creates a Strong Electron Donor from a Weak One Noncyclic Noncy clic Photo Photophos phosphoryl phorylation ation Prod Produces uces Both NADPH and ATP Chloroplasts Can Make ATP by Cyclic Photophosphorylation Without Making NADPH Photosystems I and II Have Related Structures, and Also Resemble Bacterial Photosystems The Proton-Motive Proton-Motive Force Is the Same in Mitochondria and Chloroplasts Carrier Proteins in the Chloroplast Inner Membrane Control Metabolite Exchange with the Cytosol Chloroplasts Also Perform Other Crucial Biosyntheses


Mitochondria and Chloroplasts Have Diverse Genomes Mitochondria and Chloroplasts Probably Both Evolved from Endosymbiotic Bacteria Mitochondria Have a Relaxed Codon Usage and Can Have a Variant Genetic Code Animal Mitochondria Mitochondria Contain the Simplest Genetic Systems Systems Known Some Organelle Genes Contain Introns The Chloroplast Genome of Higher Plants Contains Contains About 120 Genes Mitochondrial Genes Are Inherited by a Non-Mendelian Mechanism Orga Or gane nell lle e Gen Genes es Ar Are e Mat Mater erna nall llyy Inh Inher erit ited ed in Ma Many ny Or Orga gani nism smss Petite Mutants in Yeasts Demonstrate the Overwhelming Importa Impo rtance nce of the the Cell Cell Nuc Nucleu leuss for for Mito Mitocho chondr ndrial ial Bio Biogen genesi esiss Mitochondria and Plastids Contain Tissue-Specific Proteins that Are Encoded in the Cell Nucleus Mitochondria Import Most of Their Lipids; Chloroplasts Make Most of Theirs Mitochond Mitoc hondria ria May Contribu Contribute te to the Aging Aging of Cells and Organis Organisms ms Why Do Mitochondria and Chloroplasts Have Their Own Genetic Systems? Summary




The Earliest Cells Probably Used Fermentation Fermentation to Produce ATP ATP Electron-Transport Electron-T ransport Chains Enabled Anaerobic Bacteria to Use Nonf No nfer erme ment ntab able le Mol Molec ecul ules es as as Thei Theirr Majo Majorr Sour Source ce of of Ener Energy gy By Providing an Inexhaustible Source of Reducing Power, Power, Photosynthetic Bacteria Overcame a Major Evolutionary Obstacle The Photosynthetic Electron-T Electron-Transport ransport Chains of Cyanobacteria Cyanobacteria Produced Prod uced Atmosp Atmospheric heric Oxyg Oxygen en and Permitt Permitted ed New Life-F Life-Forms orms Summary Problems References


842 843 844 845 846 847 848 849 850 853 853 853 854 855





Mitochondria and Chloroplasts Chloroplasts Contain Complete Genetic Systems 856 Organelle Growth and Division Determine the Number of Mitochondria and Plastids in a Cell 857

859 861 862 863 863 864 866 86 6 866 867 867 868 868 870

871 87 1

872 873 875 877 878

Chapte Cha pterr 15 Mechani Mechanisms sms of Cell Cell Comm Communi unicat cation ion 879 GENERAL PRINCIPLES OF CELL COMMUNICATION




Extracellular Si Signal Mo Molecul es es Bi Bind to to Sp Specific Re Receptors 880 Extracellular Signal Molecules Can Act Over Either Short or Long Distances 881 Gap Junctions Allow Neighboring Cells to Share Signaling Information 884 Each Cell Is Programmed to Respond to Specific Combinations of Extracellular Signal Molecules 884 Different Types Types of Cells Usually Respond Differently to the Same Extracellular Signal Molecule 885 The Fate of Some Developing Cells Depends on Their Position in Morphogen Gradients 886 A Cell Can Alter the Concentration of an Intracellular Molecule Quickly Only If the Lifetime of the Molecule Is Short 886 Nitric Oxide Gas Signals by Directly Regulating the Activity of Specific Proteins Inside the Target Cell 887 Nuclear Receptors Are Ligand-Modulated Gene Regulatory Proteins 889 The Three Largest Largest Classes of Cell-Surface Receptor Proteins Proteins Are IonChannel-Coupled, G-Protein-Coupled, G-Protein-Coupled, and Enzyme-Coupled Receptors 891 Most Activated Cell-Surface Receptors Relay Signals Via Small Mole Mo lecu cule less and and a Netwo Network rk of of Intr Intrac acel ellu lula larr Sign Signal alin ing g Prot Protei eins ns 893 89 3 Many Intracellular Signaling Proteins Function as Molecular Switches That Are Activated by Phosphorylation Phosphorylation or GTP Binding 895 Intracellular Signaling Complexes Enhance the Speed, Efficiency, and Specificity of the Response 897 Modular Interaction Domains Mediate Interactions I nteractions Between Intracellular Signaling Proteins 897 Cells Can Use Multiple Mechanisms to Respond Abruptly to a Gradually Gradually Increa Increasing sing Concen Concentrat tration ion of an an Extracellu Extracellular lar Signal Signal 899 Intracellular Signaling Networks Usually Make Use of Feedback Loops 901 Cells Can Adjust Their Sensitivity to a Signal 902 Summary 903


Detailed Co Contents

SIGNALING THROUGH G-PROTEIN-COUPLED CELLSURFACE RECEPTORS (GPCRS) AND SMALL INTRACELLULAR MEDIATORS Trimeric G Proteins Proteins Relay Signals from GPCRs Some G Proteins Re Regulate th the Pr Production of of Cy Cyclic AM AMP Cyclic-AMP-Dependent Cyclic-AMP -Dependent Protein Kinase (PKA) Mediates Most of the Effects of Cyclic AMP Some G Proteins Activate An Inositol Phospholipid Signaling Pathwayy by Activating Phospholipase C-b Pathwa Ca2+ Functions as a Ubiquitous Intracellular Mediator The Frequency of Ca2+ Os Osci cilla llati tion onss In Infl flue uenc nces es a Ce Cell’ ll’s Re Resp spon onse se Ca2+/Calmodulin-Dependen /Calmodulin-Dependentt Protein Kinases (CaM-Kinases) (CaM-Kinases) Mediate Many of the Responses to Ca2+ Si Sign gnal alss in Ani Anima mall Cells Cells Some G Proteins Directly Regulate Ion Channels Smell and Vision Depend on GPCRs That Regulate CyclicNucleotide-Gated Ion Channels Intracellular Mediators and Enzymatic Cascades Amplify Extracellular Signals GPCR Desensitization Depends on Receptor Phosphorylation Summary

SIGNALING THROUGH ENZYME-COUPLED CELL-SURFACE RECEPTORS Activated Receptor Tyrosine Tyrosine Kinases (RTKs) Phosphorylate Themselves Phosphorylated Tyrosines Tyrosines on RTKs Serve as Docking Sites for Intracellular Signaling Proteins Proteins with SH2 Domains Bind to Phosphorylated Tyrosin Tyrosines es Rass Bel Ra Belon ong gs to to a Lar arge ge Sup uper erfa fami mily ly of Mo Mono nom mer eric ic GTP TPas ases es RTKs Activate Ras Via Adaptors and GEFs: Evidence from the Developing Drosophila Eye Ras Activates a MAP Kinase Signaling Module Scaffold Proteins Help Prevent Cross-Talk Between Parallel MAP Kinase Modules Rho Family GTPases Functionally Couple Cell-Surface Receptors to the Cytoskeleton PI 3-Kinase 3-Kinase Produc Produces es Lipid Lipid Docking Docking Sites Sites in the Plasma Membra Membrane ne The PI-3-Kinase–Akt Signaling Pathway Pathway Stimulates Stimulates Animal Cells to Survive and Grow The Downstream Signaling Signaling Pathways Pathways Activated By RTKs and GPCRs GPCRs Overlap Tyrosine-Kinase-Associated Tyrosin e-Kinase-Associated Receptors Depend on Cytoplasmic Cytoplasmic Tyrosine Tyrosin e Kinases Cytokine Receptors Activate the JAK–STAT Signaling Pathway, Providing a Fast Track to the Nucleus Protein Pro tein Tyros Tyrosine ine Phosphata Phosphatases ses Reverse Reverse Tyrosin Tyrosine e Phosphorylat Phosphorylations ions Signal Proteins of the TGF b Superfamily Act Through Receptor Serine/Threonine Kinases and Smads Serine/Threonine and Tyrosine Protein Kinases Are Structurally Serine/Threonine Related Bacterial Chemotaxis Depends on a Two-Component Signaling Pathw Pa thway ay Activ Activate ated d by Histidi Histidinene-Kin Kinasease-Ass Associ ociate ated d Recept Receptors ors Receptor Methylation Is Responsible for Adaptation in Bacterial Chemotaxis Summary


904 905 905 908 909 912 912 91 2 914 914 916 917 919 920 921

921 922 923 924 926 92 6 927 928 930 931 932 934 935 935 937 938 939 941 941 943 944


The Receptor Protein Notch Notch Is a Latent Gene Regulatory Protein Wnt Proteins Bind to Frizzled Receptors and Inhibit I nhibit the Degradation of b-Catenin Hedgehog Proteins Bind to Patched Relieving Its Inhibition of Smoothened Many Stressful and Inflammatory Stimuli Act Through an NFkB-Dependent Signaling Pathway






Multicellularity and Cell Communication Evolved Independently in Plants and Animals Receptor Serine/Threonine Serine/Threonine Kinases Are the Largest Class of Cell-Surface Receptors in Plants

946 948 950

955 956

Ethylene Blocks the Degradation of Specific Gene Regulatory Proteins in the Nucleus Regulated Positioning Positioning of Auxin Transporters Patterns Plant Growth Growth Phytochromes Phytochro mes Detect Red Light, and Cryptochromes Detect Blue Light Summary Problems References

Chapter 16 The Cytoskeleton

957 959 960 961 962 964




Cytoskeletal Filaments Are Dynamic and Adaptable The Cytoskeleton Can Also Form Form Stable Structures Each Type of Cytoskeletal Filament Is Constructed from Smaller Protein Subunits Filaments Formed from Multiple Protofilaments Have Advantageous Properties Nucleation Is the Rate-Limiting Step in the Formation of a Cytoskeletal Polymer The Tubulin Tubulin and Actin Subunits Assemble Head-to-Tail Head-to-Tail to Create Polar Filaments Microtubules and Actin Filaments Have Two Distinct Ends That Grow at Different Different Rates Filament Treadmilling Treadmilling and Dynamic Instability Are Consequences of Nucleotide Hydrolysis by Tubulin and Actin Treadmilling and and Dynamic Instability Aid Rapid Cytoskeletal Rearrangement

966 969

Tubulin Conserved During Eucarand yotiActin c EvolHave ution Been Highly Conserved Intermediate Filament Structure Depends on The Lateral Bundling and Twisting of Coiled Coils Intermediate Filaments Impart Mechanical Stability to Animal Cells Drugs Can Alter Filament Polymerization Bacterial Cell Organization and Cell Division Depend on Homologs of the Eucaryotic Cytoskeleton Summary




970 971 973 973 975 976 980

983 985 987 989 991

A Protein Complex Containing g-Tub ubul ulin in Nu Nucl clea eate tess Mic Micro rotu tubu bule less 992 99 2 Micr Mi crot otub ubul ules es Em Eman anat ate e fro from m the the Ce Cent ntro roso some me in An Anim imal al Ce Cell llss 992 99 2 Acti Ac tin n Fil Filam amen ents ts Are Are Oft Often en Nuc Nucle leat ated ed at at the the Plas Plasma ma Mem Membr bran ane e 996 99 6 The Mechanism of Nucleation Influences Large-Scale Large-Scale Filament Organization 998 Proteins That Bind to to the Free Free Subunits Modify Filament Elongation Elongation 999 Severing Proteins Regulate the Length and Kinetic Behavior of Actin Filaments and Microtubules 1000 Proteins That Bind Along the Sides of Filaments Can Either Stabilize or Destabilize Them 1001 Proteins That Interact with Filament Ends Can Dramatically Change Filament Dynamics 1002 Different Kinds of Proteins Alter the Properties of Rapidly Growing Microtubule Ends 1003 Filame Fil aments nts Are Org Organi anized zed int into o High Higherer-Or Order der Str Structu ucture ress in in Cell Cellss 1005 100 5 Intermediate Filaments Are Cross-Linked and Bundled Into Strong Arrays 1005 Cross-Linking Proteins with Distinct Properties Organize Different Assemblies of Actin Filaments 1006 Filamin and Spectrin Form Actin Filament Webs 1008 Cytos Cy toskel keleta etall Elem Element entss Mak Make e Man Manyy Att Attach achmen ments ts to Mem Membra brane ne 1009 100 9 Summary 1010

MOLECULAR MOTORS Actin-Based Motor Proteins Are Members of the Myosin Super family There Are Two Two Types Types of Microtubule Motor Proteins: Proteins: Kinesins and Dyneins The Structural Similarity of Myosin and Kinesin Indicates Indicates a Common Evolutionary Origin Motor Proteins Generate Force by Coupling ATP Hydrolysis to Conformational Changes

1010 1011 1014 1015 1016

Detailed Contents

Motor Protein Kinetics Are Adapted to Cell Functions Motor Proteins Mediate the Intracellular Transport of MembraneEnclosed Organelles The Cytoskeleton Localizes Localizes Specific RNA Molecules Cells Regulate Motor Protein Function Summary




Sliding of Myosin II and Actin Filaments Causes Muscles to Contract A Sudden Rise in Cytosolic Ca 2+ Concentration Initiates Muscle


1021 1022 1023 1025

rascctleioIns a Precisely Engineered Machine 10 HeaCro tn Mtu 1 02 38 1 Cilia and Flagella Are Motile Structures Built from Microtubules and Dyneins 1031 Construction of the Mitotic Spindle Requires Microtubule Dyna Dy nami mics cs an and d th the e In Inte tera ract ctio ions ns of Ma Man ny Mo Moto torr Pr Prot otei eins ns 1034 10 34 Many Cells Can Crawl Across A Solid Substratum 1036 Actin Polymerization Drives Plasma Membrane Protrusion 1037 Cell Adhesion and Traction Allow Cells to Pull Themselves Forward 1040 Members of the Rho Protein Family Cause Major Rearrangements of the Actin Cytoskeleton 1041 Extracellular Signals Can Activate the Three Rho Protein Family Members 1043 Exte Ex tern rnal al Sig Signa nals ls Ca Can n Dic Dicta tate te th the e Dire Direct ctio ion n of of Cel Celll Migr Migrat atio ion n 1045 10 45 Communication Between the Microtubule and Actin Cytoskeletons Coo oorrdi din nat ates es Who hole le-C -Cel elll Pol olar ariz izat atio ion n an and d Loc ocom omot otio ion n 104 10 46 The Complex Morphological Specialization of Neurons Neurons Depends on the Cytoskeleton 1047 Summary 1050 Problems 1050 References 1052

Chapter 17 The Cell Cycle




The Eucaryotic Cell Cycle Is Divided into Four Four Phases Cell-Cycle Control Is Similar in All Eucaryotes Cell-Cycle Control Can Be Dissected Genetically by Analysis of Yeast Mutants Cell-Cycle Control Can Be Analyzed Biochemically in Animal Embryos Cell-C Cel l-Cyc ycle le Contr Control ol Can Can Be Studi Studied ed in Cult Culture ured d Mammal Mammalian ian Cell Cellss Cell-Cycle Progression Can Be Studied in Various Ways Summary

1054 1056



The Cell-Cycle Control Control System Triggers Triggers the Major Events Events of the Cell Cycle The Cell-Cycle Control Control System Depends on Cyclically Cyclically Activated Cyclin-Dependent Cyclin-Depen dent Protein Kinases (Cdks) Inhibitory Phosphorylation and Cdk Inhibitory Proteins (CKIs) Can Suppress Cdk Activity The Cell-Cycle Control Control System Depends on Cyclical Cyclical Proteolysis Cell-C Cel l-Cyc ycle le Contr Control ol Also Also Depen Depends ds on Tr Trans anscri cripti ptiona onall Regula Regulatio tion n The Cell-Cycle Control Control System Functions as a Network Network of Biochemical Switches Summary

1056 1057 1059 105 9 1059 1060

1060 1062 1063 1064 1065 106 5 1065 1067



S-Cdk Initiates DNA Replication Once Per Cycle Chromosome Duplication Requires Duplication of Chromatin Structure Cohesins Help Hold Sister Chromatids Together Summary

1067 1069 1070 1071



M-Cdk Drives Entry Into Mitosis Deph De phos osph phory oryla lati tion on Ac Acti tiva vate tess MM-Cd Cdkk at th the e On Onse sett of Mi Mito tosi siss Condensin Helps Configure Duplicated Chromosomes for Separation The Mitotic Spindle Is a Microtubule-Based Machine

1071 1074 10 74 1075 1075


Microtubule-Dependent Motor Proteins Govern Spindle Assembly and Function Two Mechanisms Mechanisms Collaborate in the Assembly of a Bipolar Mitotic Spindle Centrosome Du Duplication Oc Occurs Ea Early in in th the Ce Cell Cy Cycle M-Cdk Initiates Spindle Assembly in Prophase The Completion of Spindle Assembly in Animal Cells Requires Nuclear Envelope Breakdown Microtubule Instability Increases Greatly in Mitosis Mito Mi tottic Ch Chrrom omo oso some mess Pr Prom omot ote e Bip Bipol olar ar Sp Spin indl dle e As Asse semb mbly ly Kinetochores Attach Sister Chromatids to the Spindle

1077 1077 1078 1078 1079 1080 108 081 1 1082

B tirocnesIsMo AocvheieCh vh erdob l aen Mi-uOltriipelnetFao M C myoTsroiam s don onErtrhoer Sp Spindle The APC/C Triggers Triggers Sister-Chromatid Sister-Chromatid Separation and the Completion of Mitosis Unattached Chromosomes Block Sister-Chromatid Separation: The Spindle Assembly Checkpoint Chromosomes Segregate in Anaphase A and B Segregated Chromosomes Are Packaged in Daughter Nuclei at Telophase Telophas e Meiosis Is a Special Form of Nuclear Division Involved in Sexual Reproduction Summary

1 10 08 83 5



1087 1088 1089 1090 1090 1092

Actin and Myosin II in the Contractile Ring Generate the Force for Cytokinesis Local Activation of RhoA Triggers Assembly and Contraction of the Contractile Ring The Microtubules of the Mitotic Spindle Determine the Plane of Animal Cell Division The Phragmoplast Guides Cytokinesis Cytokinesis in Higher Plants Membrane-Enclosed Organelles Must Be Distributed to Daughter Cells During Cytokinesis Some Som e Cell Cellss Repo Reposit sition ion Th Their eir Spi Spindl ndle e to Div Divide ide Asy Asymme mmetri trical cally ly Mitosis Can Occur Without Cytokinesis The G1 Phase Is a Stable State of Cdk Inactivity Summary

1093 1094 1095 1097 1098 1099 109 9 1099 1100 1101



Mitogens Stimulate Cell Division Cells Can Delay Division by Entering a Specialized Nondividing State Mitogens Stimulate G1-Cdk and G1/S-Cdk Activities DNA Damage Blocks Cell Division: The DNA Damage Response Many Human Cells Have a Built-In Limitation on the Number of Times They Can Divide Abnormal Proliferation Signals Cause Cell-Cycle Arrest or Apoptosis, Except in Cancer Cells Organism and Organ Growth Depend on Cell Growth Prolifer Prol iferating ating Cells Usual Usually ly Coordi Coordinate nate Thei Theirr Growth Growth and Divisi Division on Neig Ne ighb hbor orin ing g Ce Cells lls Co Comp mpet ete e for for Ex Extr trac acel ellu lula larr Sig Signa nall Pro Prote tein inss Anim An imal alss Co Cont ntrrol Tot otal al Cel elll Mas Masss by by Un Unkn know own n Mec Mech han anis isms ms Summary Problems References


Chapter 18 Apoptosis

1103 1103 1105 1007 1107 1108 1108 1110 11 10 111 111 1 1112 1112 1113


Programmed Cell Death Eliminates Unwanted Cells Apoptotic Cells Are Biochemically Recognizable Apoptosis Depends on an Intracellular Proteolytic Cascade That Is Mediated by Caspases Cell-Surface Death Receptors Activate the Extrinsic Pathway of Apoptosis The Intrinsic Pathway Pathway of Apoptosis Depends on Mitochondria Bcl2 Proteins Regulate the Intrinsic Pathwa Pathwayy of Apoptosis IAPs Inhibit Caspases Extrac Ext racell ellula ularr Surviv Survival al Fact Factors ors Inhi Inhibit bit Apop Apoptos tosis is in Va Vario rious us Way Wayss Either Excessiv Excessive e or Insufficient Insufficient Apoptosis Can Contribu Contribute te to Disease Summary Problems References

1115 1117 1118 1120 1121 1121 1124 1126 112 6 1127 1128 1128 1129


Detailed Contents

Chapter 19 Cell Junctions, Cell Adhesion, and the Extracellular Matrix CADHERINS AND CELL–CELL ADHESION Cadherins Mediate Ca2+-Dependent Cell–Cell Adhesion in All Animals The Cadherin Superfamily in Vertebrates Vertebrates Includes Hundreds of Different Proteins, Including Many with Signaling Functions Cadherins Mediate Homophilic Adhesion Selective Cell–Cell Adhesion Enables Dissociated Vertebrate Cells to Reassemble into Organized Tissues Cadherins Control the Selective Assortment of Cells Twist Regulates Regulates Epithelial-Mesenchymal Epithelial-Mesenchymal Transitions Transitions Cate Ca teni nins ns Li Link nk Cl Clas assi sica call Ca Cadh dher erin inss to th the e Ac Acti tin n Cy Cyto tosk skel elet eton on Adherens Junctions Coordinate the Actin-Based Motility of Adjacent Cells Desm De smos osom ome e Jun Junct ctio ions ns Gi Give ve Ep Epit ithe heli lia a Mec Mecha hani nica call Str Stren engt gth h Cell–Cell Junctions Send Signals into the Cell Interior Selectins Mediate Transient Cell–Cell Adhesions in the Bloodstream Members of the Immunoglobulin Superfamily of Proteins Mediate Ca2+-Independent Cell–Cell Ad Adhesion Many Types Types of Cell Adhesion Molecules Act in Parallel to Create a Synapse Scaffold Proteins Organize Junctional Complexes Summary

1131 1133 1135

1136 1137 1139 1140 1141 1142 11 42



The Extracellular Matrix Is Made and Oriented by the Cells Within It Glycosaminoglycan Glycosaminogly can (GAG) Chains Occupy Large Amounts of Space and Form Hydrated Gels Hyaluronan Acts as a Space Filler and a Facilitator of Cell Migration During Tissue Morphogenesis and Repair Proteoglycanss Are Composed of GAG Chains Covalently Linked Proteoglycan to a Core Protein Prote Pr oteogl oglyc ycans ans Can Reg Regula ulate te the the Activ Activiti ities es of Sec Secret reted ed Prot Protein einss

1179 1179 1180 1181 1182 118 2 1183 1184 11 84





The Composition of the Cell Wall Wall Depends on the Cell Type Type The Tensile Tensile Strength of the Cell Wall Allows Plant Cells to Develop Turgor Pressure The Primary Cell Wall Is Built from Cellulose Microfibrils Microfibrils Interwoven with a Network of Pectic Polysacchar Polysaccharides ides Ori rien entted Cel elll-W Wall Dep epos osit itio ion n Co Cont ntrrol olss Pla Plan nt Cel Celll Gr Grow owth th Microtubules Orient Cell-Wall Deposition Summary Problems References


1142 1143 11 43 1145 1145 1146 1147 1148 1149

1153 1155 115 157 7 1158


Gap Jun Juncti ctions ons Cou Couple ple Cel Cells ls Both Both Ele Electr ctrica ically lly and Met Metabo abolic licall allyy A Gap-Junction Connexon Is Made Up of Six Transmembrane Connexin Subunits Gap Junctions Have Diverse Functions Cell Ce llss Can Can Re Regu gula late te th the e Per Perme meab abil ilit ityy of of Th Thei eirr Gap Gap Ju Junc ncti tion onss In Plants, Plasmodesmata Perform Many of the Same Functions as Gap Junctions Summary

1158 115 8



Basal Laminae Underlie All Epithelia and Surround Some Nonepithelial Cell Types Laminin Is a Primary Component of the Basal Lamina Type IV Collagen Gives the Basal Basal Lamina Tensile Tensile Strength Basal Laminae Have Diverse Functions Summary

1164 1165 1166 1167 1169



Integrins Are Transmembrane Transmembrane Heterodimers That Link to the Cytoskeleton Integrins Can Switch Between an Active and an Inactive Conformation Integrin Defects Are Responsible for Many Different Genetic Diseases Integrins Cluster to Form Strong Adhesions Extracellular Matrix Attachments Act Through Integrins to Control Cell Proliferation and Survival Integrins Recruit Intracellular Signaling Proteins at Sites of CellSubstratum Adhesion Integrins Can Produce Localized Intracellular Effects Summary


Cell-Sur face Proteoglycans Act as Co-Receptors Coll Co llag agen enss Are Are the the Majo Majorr Prot Protei eins ns of of the the Extr Extrac acel ellu lula larr Matr Matrix ix Collagen Chains Undergo a Series of PostPost-Translatio Translational nal Modifications Propeptides Are Clipped Off Procollagen After Its Secretion to Allow Assembly of Fibrils Secret Sec reted ed Fi Fibri bril-A l-Asso ssocia ciated ted Co Collag llagens ens Hel Help p Orga Organiz nize e the the Fi Fibri brils ls Cells Help Organize the Collagen Fibrils They Secrete by Exerting Tension on the Matrix Elastin Gives Tissues Their Elasticity Fibronectin Is an Extracellular Protein That Helps Cells Attach to the Matrix Tension Tens ion Exerted by Cells Regulates Assembly of Fibronectin Fibronectin Fibrils Fibronectin Binds to Integrins Through an RGD Motif Cell Ce llss Hav Have e to to Be Be Abl Able e to to Deg Degra rade de Ma Matr trix ix,, as as Wel elll as as Mak Make e it it Matrix Degradation Is Localized to the Vicinity of Cel ls ls Summary

TIGHT JUNCTIONS AND THE ORGANIZA ORGANIZATION TION OF Tight Junctions Form a Seal Between Cells and a Fence Fence Between Membrane Domains Scaffold Proteins in Junctional Complexes Play a Key Part in the Control of Cell Proliferation Cell-Cell Junctions and the Basal Lamina Govern Apico-Basal Polarity in Epithelia A Sep Separ arat ate e Sig Sign nal alin ing g Sy Syst stem em Con ontr trol olss Pla Plan nar Cel elll Pol Polar arit ityy Summary


Chapter 20 Cancer 1159 1161 1161 11 61 1162 1163

1170 1170 1172 1174 1175 1176 1177 1178

CANCER AS A MICROEVOLUTIONARY PROCESS Cancer Cells Reproduce Without Restraint and Colonize Other Tissues Most Cancers Derive from a Single Abnormal Cell Cancer Cells Contain Somatic Mutations A Single Mutation Is Not Enough to Cause Cancer Canc Ca ncer erss Dev Devel elop op Gr Grad adua uall llyy fr from om In Incr crea easi sing ngly ly Ab Aber erra rant nt Ce Cell llss Cervical Cancers Are Prevented by Early Detection Tumor Progression Progression Involves Successive Successive Rounds of Random Inherited Change Followed by Natural Selection The Epigenetic Changes That Accumulate in Cancer Cells Involve Involve Inh In her erit ited ed Ch Chrrom omat atin in St Stru ruct ctur ures es an and d DNA Me Metthyla lati tion on Human Cancer Cells Are Genetically Unstable Cancerous Growth Often Depends on Defective Control of Cell Death, Cell Differentiation, or Both Cancer Cells Are Usually Altered in Their Responses to DNA Damage and Other Forms of Stress Human Hum an Canc Cancer er Cell Cellss Escap Escape e a Built Built-In -In Limi Limitt to Cell Cell Pro Prolif lifera eratio tion n A Small Population of Cancer Stem Cells Maintains Many Tumors How Do Cancer Stem Cells Arise? To Metastasize, Metastasize, Malignant Cancer Cancer Cells Must Survive and Proliferate in a Foreign Environment Tumors Induce Angiogenesis Angiogenesis The Tumor Tumor Microenvironment Microenvironment Influences Cancer Development Many Ma ny Pr Prop oper erti ties es Typ ypic ical ally ly Co Cont ntri ribu bute te to Ca Canc ncer erou ouss Gro Growt wth h Summary

1186 1187 1187 118 7 1189 1189 1191 1191 1193 1193 11 93 1194 1195

1197 1197 119 199 9 1200 1202 1202 1204

1205 1205 1206 1207 1208 1209 1210 12 10 1211 1212 121 213 3 1214 1215 1216 1217 121 7 1217 1218 1220 1220 1222 1223 12 23 1223

Detailed Contents



Many, Bu But No Not Al Al l,l, Ca Cancer-Causing Ag Agents Da Damage DN DNA Tumor Initiators Damage DNA; Tumor Promoters Promoters Do Not Viruses and Other Infections Contribute to a Significant Proportion of Human Cancers Identification of Carcinogens Reveals Ways to Avoid Cancer Summary

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1227 1229 1230

The Identification of Gain-of-Function Gain-of-Function and Loss-of-Function Loss-of-Function Mutations Requires Different Methods Retroviruses Can Act as Vectors for Oncogenes That Alter Cell Behavior Different Searches for Oncogenes Have Converged on the Same Gene—Ras Studies of Rare Hereditary Cancer Syndromes First Identified Tumor Suppressor Genes Genes Tumor Suppressor Genes Genes Can Also Be Identified from Studies of Tumors Both Genetic and Epigenetic Mechanisms Can Inactivate I nactivate Tumor Suppressor Genes Genes Mutated in Cancer Can Be Made Overactive in Many Ways The Hunt for Cancer-Critical Cancer-Critical Genes Continues Summary




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Studies of Both Developing Embryos and Genetically Engineered Mice Have Helped to Uncover the Function of Cancer-Critical Genes Many Cancer-Critical Genes Regulate Cell Proliferation Distinct Pathways May Mediate the Disregulation of Cell-Cycle Progression and the Disregulation of Cell Growth in Cancer Cells Mutations in Genes That Regulate Apoptosis Allow Cancer Cells to Survive When They Should Not Mutations in thep53 the p53 Gene Allow Many Cancer Cells to Survive and Proliferate Despite DNA Damage DNA Tumor Viruses Viruses Block the Action of Key Tumor Suppressor Proteins The Changes in Tumor Tumor Cells That Lead to Metastasis Metastasis Are Still Largely a Mystery Colorectal Cancers Evolve Slowly Via a Succession of Visible Changes A Few Key Genetic Lesions Are Common to a Large Fraction of Colorectal Cancers Some Som e Colore Colorectal ctal Canc Cancers ers Have Have Defect Defectss in DNA Misma Mismatch tch Repa Repair ir The Steps of Tumor Tumor Progression Can Often Often Be Correlated with Specific Mutations Each Case of Cancer Is Characterized by Its Own Array of Genetic Lesions Summary

CANCER TREATMENT: PRESENT AND FUTURE The Search for Cancer Cures Cures Is Difficult but Not Hopeless Traditional Therapies Exploit the Genetic Instability and Loss of Cell-Cycle Checkpoint Responses in Cancer Cells New Drugs Can Exploit the Specific Cause of a Tumor’s Tumor’s Genetic Instability Genetic Instability Helps Cancers Become Progressively More Resistant to Therapies New Therapies Are Emerging from Our Knowledge of Cancer Biology Small Molecules Can Be Designed to Inhibit Specific Oncogenic Proteins Tumor Blood Vessels Vessels Are Logical Targets Targets for Cancer Therapy Many Cancers May Be Treatable by Enhancing the Immune Response Against a Specific Tumor Treating Treatin g Patients with Several Drugs Simultaneously Simultaneously Has Potential Advantages for Cancer Therapy Gene Expression Profiling Can Help Classify Cancers into Clinically Meaningful Subgroups

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There Is Still Much More to Do Summary Problems References


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Chapters 21–25 available on Media DVD-ROM Chapter 21 Sexual Reproduction: Meiosis, Germ Cells, and Fertilization




The Haploid Phase in Higher Eucaryotes Is Brief Meiosis Creates Genetic Diversity Sexual Reproduction Gives Organisms a Competitive Advantage Summary

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Gametes Are Pr Produced by Two Me Meiotic Ce Cell Di Divisions Duplicated Homologs (and Sex Chromosomes) Pair During Early Prophase I Homolog Pairing Culminates in the Formation of a Synaptonemal Complex Homolog Segregation Depends on Meiosis-Specific, KinetochoreAssociated Proteins Meiosis Frequently Goes Wrong Crossing-Over En Enhances Ge Genetic Re Reassortment Crossing-Over Is Highly Regulated Meiosi Mei osiss Is Reg Regula ulated ted Dif Diffe feren rently tly in Male Male and Fe Femal male e Mamm Mammals als Summary



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Signal Sign alss from from Nei Neigh ghbo bors rs Spe Speci cify fy PGC PGCss in Mam Mamma mali lian an Emb Embry ryos os PGCs Migrate into the Developing Gonads The Sry SryGene Gene Directs the Developing Mammalian Gonad to Become a Testis Many Aspects of Sexual Reproduction Vary Greatly between Animal Species Summary

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An Egg Egg Is Is High Highly ly Spe Speci cial aliz ized ed for for Ind Indep epen ende dent nt Dev Devel elop opme ment nt Eggs Develop in Stages Oocyt Oo cytes es Use Use Spe Speci cial al Mec Mecha hani nism smss to to Gro Grow w to to The Their ir Lar Large ge Si Size ze Most Human Oocytes Die Without Maturing Summary

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Sperm Are Hig Sperm Highly hly Ada Adapte pted d for for Del Delive iverin ring g The Their ir DNA to an Egg Sper Sp erm m Are Are Prod Produc uced ed Con Conti tinu nuou ousl slyy in th the e Mamm Mammal alia ian n Tes Testi tiss Sperm Develop as a Syncytium Summary





Ejaculated Sperm Become Capacitated Capacitated in the the Female Genital Tract 1297 Capacitated Sperm Bind to the Zona Pellucida and Undergo an Acrosome Reaction 1298 The Mechanism of Sperm–Egg Fusion Fusion Is Still Unknown 1298 Sperm Fusion Activates the Egg by Increasing Ca2+ in th the e Cyt Cytos osol ol 12 1299 99 The Cortical Reaction Helps Ensure That Only Only One Sperm Fertilizes the Egg 1300 The Sperm Provides Centrioles as Well as Its Genome to the Zygote 1301 IVF and ICSI Have Revolutionized the Treatment Treatment of Human Infertility 1301 Summary 1303

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Chapter 22 Development of Multicellular Organisms

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Animals Share Some Basic Anatomical Features



Detailed Contents


Multicellular Animals Are Enriched in Proteins Mediating Cell Interactions and Gene Regulation Regulatory DNA De Defines th the Pr Program of De Development Manipulation of the Embryo Reveals the Interactions Between Its Cells Studies of Mutant Animals Identify I dentify the Genes That Control Developmental Processes A Cell Makes Developmental Decisions Long Before It Shows a Visible Change Cells Have Remembered Positional Values That Reflect Their Location in the Body Inductive Orderly Differences Between InitiallySignals IdenticCan al CeCreate lls Sister Cells Can Be Born Different by an Asymmetric Cell Division Positive Feedback Can Create Asymmetry Where There Was None Before Positive Feedback Generates Patterns, Creates All-or-None Outcomes, and Provides Memory A Small Set of Signaling Pathways, Pathways, Used Repeatedly, Controls Developmental Patterning Morphogen Morph ogenss Are LongLong-Range Range Inducer Inducerss That That Exert Exert Graded Graded Effects Effects Extracellular Inhibitors of Signal Molecules Shape the Response to the Inducer Developmental Signals Can Spread Through Tissue in Several Different Ways Programs That That Are Intrinsic to a Cell Of ten Define the Time-Course of its Development Initial Patterns Are Established in Small Fields of Cells and Reffin Re ined ed by Seq Seque uen nti tial al In Indu duct ctio ion n as the Em Embr bryyo Gr Grows Summary

CAENORHABDITIS ELEGANS: DEVELOPMENT FROM THE PERSPECTIVE OF THE INDIVIDUAL CELL Caenorhabditis elegans Is Anatomically Simple Caenorhabditis Cell Fates in the Developing Nematode Are Almost Perfectly Predictable Products of Maternal-Effect Genes Organize the Asymmetric Division of the Egg Progressively Progressiv ely More Complex Patterns Are Created by Cell–Cell Interactions Microsurgery and Genetics Reveal the Logic of Developmental Control; Gene Cloning and Sequencing Reveal Its Molecular Mechanisms Cells Change Over Time in Their Responsiveness to Developmental Signals Hetter He eroc och hron onic ic Gen enes es Con ontr trol ol th the e Tim Timin ing g of of Dev Devel elop opme men nt Cells Do Not Count Cell Divisions in Timing Their Internal Programs Selected Cells Die by Apoptosis as Part of the Program of Development Summary


Egg-Polarity, Gap, and Pair-Rule Genes Create a Transien Egg-Polarity, Transientt Pattern That Is Remembered by Other Genes Summary

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The Hox Code Specifies Anterior-Posterior Anterior-Posterior Differences Differences Homeotic Selector Genes Code for DNA-Binding Proteins That Interact with Other Gene Regulatory Proteins The Homeotic Selector Genes Are Expressed Sequentially According to Their Order in the Hox Complex

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TheInHox Complex Record of Positional form ation Carries a Permanent Record The Anteroposterior Axis Is Controlled Controlled by Hox HoxSelector Selector Genes in Vertebrates Also Summary



Conditional and Induced Somatic Mutations Make it Possible to Analyze Gene Functions Late in Development Body Bo dy Part rtss of th the e Adu dult lt Fly De Dev vel elop op From Im Imag agin inal al Di Disc scss Homeotic Selector Genes Are Essential for the Memory of Positional Information in Imaginal Disc Cells Specific Regulatory Genes Define the Cells That Will Form an Appendage The Insect Wing Disc Is Divided into Compartments Four Familiar Signaling Pathways Combine to Pattern the Wing Disc: Wingless, Hedgehog, Dpp, and Notch The Size of Each Compartment Is Regulated by Interactions Among Its Cells Similar Mechanisms Pattern the Limbs of Vertebrates Localized Expression of Specific Classes of Gene Regulatory Proteins Foreshadows Cell Differentiation Lateral Inhibition Singles Out Sensory Mother Cells Within Proneural Clusters Lateral Inhibition Drives the Progeny of the Sensory Mother Cell Toward Tow ard Different Final Final Fates Planar Polarity of Asymmetric Divisions is Controlled by Signaling via the Receptor Frizzled Asymmetric Stem-Cell Divisions Generate Additional Neurons in the Central Nervous System Asymmetric Neuroblast Divisions Segregate an Inhibitor of Cell Division into Just One of the Daughter Cells Notch Signaling Regulates the Fine-Grained Pattern of Differentiated Cell Types in in Many Different Tissues Some Key Regulatory Genes Define a Cell Type; Others Can Activate th the Pr Program fo for Cr Creation of of an an En Entire Or Organ Summary

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The Insect Body Is Constructed as a Series of Segmental Units 1329 Drosophila Begins Its Development as a Syncytium 1330 Genetic Screens Define Groups of Genes Required for Specific Aspects of Early Patterning 1332 Interactions of the Oocyte With Its I ts Surroundings Define the Axes Ax es of th the e Em Embr bryo yo:: th the e Ro Role le of th the e Eg Eggg-P Pol olar arit ity y Ge Gene ness 1333 13 33 The Dorsoventral Signaling Signaling Genes Create a Gradient of a Nuclear Gene Regulatory Protein 1334 Dpp and Sog Set Up a Secondary Morphogen Gradient to Refine the Pattern of the Dorsal Part of the Embryo 1336 The Insect Dorsoventral Axis Corresponds Corresponds to the Vertebrate Vertebrate Ventrodorsal Axis 1336 Three Classes of Segmentation Genes Genes Refine the Anterior–Posterior Anterior–Posterior Maternal Pattern and Subdivide the Embryo 1336 The Localized Expression Expression of Segmentation Genes Is Regulated by a Hierarchy of Positional Signals 1337 The Modular Nature of Regulatory DNA Allows Allows Genes to Have Multiple Independently Controlled Functions 1339

The Polarity Polarity of the Amphibian Amphibian Embryo Embryo Depends Depends on the Polarity Polarity of the Egg Cleavage Produces Many Cells from One Gastrulation Transforms Transforms a Hollow Ball of Cells into a Three-Layered Structure with a Primitive Gut The Movements of Gastrulation Are Are Precisely Predictable Chemical Si Signals Trigger th the Me Mechanical Pr Processes Active Changes of Cell Packing Provide a Driving Force for Gastrulation Changing Patterns of Cell Adhesion Molecules Force Cells Into New Arrangements The Notochord Elongates, Elongates, While the Neural Neural Plate Rolls Up to Form the Neural Tube A Gene-Expression Oscillator Controls Segmentation of the Mesoderm Into Somites Delayed Negative Feedback May Generate the Oscillations of the Segmentation Clock Embryonic Tissues Are Invaded in a Strictly Controlled Fashion by Migratory Cells The Distribution of Migrant Cells Depends on Survival Factors Factors as Well as Guidance Cues

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Detailed Contents

Left–Right Asymmetry of the Vertebrate Body Derives From Molecular Asymmetry in the Early Embryo Summary

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Mammal Mam malian ian Dev Develo elopme pment nt Beg Begins ins Wit With h a Spe Specia cializ lized ed Prea Preambl mble e The Early Mammalian Embryo Is Highly Regulative Totipotent Totipot ent Embryonic Stem Cells Can Be Obtained From a Mammalian Embryo Interactions Between Epithelium and Mesenchyme Generate Branching Tubular Structures

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The Basal Layer Contains Contains Both Stem Cells and Transit Transit Amplifying Cells Transit amplifying amplifying Divisions Are Part of the Strategy of Growth Growth Control Stem Cells of Some Tissues Selectively Retain Original DNA Strands The Rate of Stem-Cell Division Can Increase Dramatically When New Cells Are Needed Urgently Many In Interacting Si Signals Go Govern Ep Epidermal Re Renewal The Mammary Gland Undergoes Cycles Cycles of Development and Regression









Olfactory Sensory Neurons Are Continually Replaced Auditory Hair Cells Have to Last a Lifetime Most Permanent Cells Renew Their Parts: the Photoreceptor Cells of the Retina Summary

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Adjace Adja cent nt Ce Cell ll Typ ypes es Co Coll llab abor orat ate e in in the the Al Alve veol olii of of the the Lu Lung ngss Goblet Cells, Ciliated Cells, and Macrophages Collaborate to Keep the Airways Clean The Lining of the Small Intestine Renews Renews Itself Faster Than Any Other Tissue Wnt Sig Sign nal alin ing g Mai Main nta tain inss th the Gut Gut Ste temm-C Cel elll Com Compa part rtme men nt Notch Signaling Controls Gut Cell Diversification Ephrin–Eph Signaling Controls the Migrations of Gut Epithelial Cells Wnt, Hedgehog, PDGF, and BMP Signaling Pathways Combine to Delimit the Stem-Cell Niche The Liver Functions as an Interface Between the the Digestive Tract Tract and the Blood Liver Cell Loss Stimulates Liver Cell Proliferation Tissue Renewal Does Not Have to Depend on Stem Cells: InsulinSecreting Cells in the Pancreas Summary

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Neurons Are Assigned Different Characters According to the Time and Place Where They Are Born The Character Assigned to a Neuron at Its Birth Governs the the Connections It Will Form Each Axon or Dendrite Extends by Means of a Growth Cone at Its Tip The Growth Cone Pilots Pilots the Developing Neurite Along a Precisely Defined Path In Vivo Grow Gr owth th Co Cone ness Can Can Ch Chan ange ge Th Thei eirr Sen Sensi sibi bilit litie iess as as Th They ey Tra rave vell Target Targ et Tissues Release Neurotrophic Neurotrophic Factors That Control Nerve Cell Growth and Survival Neuronal Specificity Guides the Formation of Orderly Neural Maps Axons From Different Regions of the Retina Respond Differently to a Gradient of Repulsive Molecules in the Tectum Diffuse Patterns of Synaptic Connections Are Sharpened by Activity-Dependent Remodeling Experience Molds the Pattern of Synaptic Connections in the Brain Adult Memory and Developmental Synapse Remodeling May Depend on Similar Mechanisms Summary

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Arabidopsis Serves as a Model Organism for Plant Molecular Genetics TheArabidopsis The Arabidopsis Genome Is Rich in Developmental Control Genes Embryonic Development Starts by Establishing a Root–Shoot Axis and Then Halts Inside the Seed The Parts of a Plant Are Generated Sequentially by Meristems Meristems Developmen Devel opmentt of the Seedling Seedling Depends Depends on Environmen Environmental tal Signals Signals Long-Range Hormonal Signals Coordinate Developmental Events in Separate Parts of the Plant




Endothelial Ce Cells Li Line Al All Bl Blood Vessels an and Ly Lymphatics Endothelial Tip Cells Pioneer Angiogenesis Different Types of Endothelial Endothelial Cells Form Form Different Different Types Types of Vessel Tissues Requiring a Blood Supply Release VEGF; VEGF; Notch Signaling Between Endothelial Cells Regulates the Response Signals from Endothelial Cells Control Recruitment of Pericytes and Smooth Muscle Cells to Form the Vessel Wall Summary

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The Shaping of Each New Structure Depends Depends on Oriented Cell Division and Expansion Each Plant Module Grows From a Microscopic Set of Primordia in a Meristem Polarized Auxin Transport Controls the Pattern of Primordia in the Meristem Cell Signaling Maintains the Meristem Regulatory Mutations Can Transform Plant Topology by Altering Cell Behavior in the Meristem The Switch to Flowering Flowering Depends on Past and Present Present Environmental Cues Homeotic Se Selector Ge Genes Sp Specify th the Pa Parts of of a Flower Summary References

Chapter 23 Specialized Tissues, Stem Cells, and Tissue Renewal


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Epi pid dermal Ce Cells Fo Form a Multilayered Wa Waterproof Ba Barrier Differentiating Epidermal Cells Express a Sequence of Different Genes as They Mature Stem Cells in the Basal Basal Layer Provide Provide for Renewal of the Epidermis The Two Two Daughters of a Stem Cell Do Not Always Have to Become Different

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RENEWAL BY MULTIPOTENT STEM CELLS: BLOOD CELL FORMATION The Three Main Categories Categories of White Blood Cells Are Are Granulocytes, Monocytes, and Lymphocytes The Production of Each Type Type of Blood Cell in the Bone Marrow Is Individually Controlled Bone Marrow Contains Hemopoietic Stem Cells A Multi Multipot potent ent Ste Stem m Cell Cell Give Givess Rise Rise to to All All Class Classes es of of Blood Blood Cel Cells ls Commitment Is a Stepwise Process Divisions of Committed Progenitor Cells Amplify the Number of Specialized Blood Cells Stem St em Cel ells ls De Depe pen nd on on Con Conta tact ct Sig igna nals ls From St Strroma mall Cel Cells ls Facto Fa ctors rs Tha Thatt Regula Regulate te Hemop Hemopoie oiesis sis Can Can Be Anal Analyz yzed ed in Cult Cultur ure e Eryyth Er thrrop opoi oies esis is De Depe pen nds on the Ho Horm rmon one e Ery rytthr hro opo poie ieti tin n Multiple Multi ple CSFs CSFs Influenc Influence e Neutroph Neutrophil il and and Macroph Macrophage age Produ Production ction The Behavior of a Hemopoietic Cell Depends Partly on Chance

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Regulation of Cell Survival Is as Important as Regulation of Cell Proliferation Summary

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Myoblasts Fuse to Form New Skeletal Muscle Fibers



Detailed Contents

Pathogens Evolve Rapidly Antigenic Variation in Pathogens Occurs by Multiple Mechanisms Error-Prone Replication Dominates Viral Evolution Drug-Resistant Pathogens Are a Growing Problem Summary


Muscle Cells Can Vary Their Properties by Changing the Protein Isoforms They Contain Skeletal Muscle Muscle Fibers Secrete Secrete Myostatin to Limit Their Their Own Growth Growth Some So me My Myob obla last stss Per Persi sist st as Qu Quie iesc scen entt Ste Stem m Cell Cellss in in the the Ad Adul ultt Summary

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Epithe Epit heli lial al Sur urfa facces an and d De Deffen ensi sin ns Hel Help p Pr Prev even entt In Infec ecti tion on Huma Hu man n Cel Cells ls Rec ecog ogni nizze Con Consser erv ved Fea eatu turres of Pat ath hog ogen enss

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Diff Di atio boynAff Aeffec ecti Cell ll Sh Shap ape e and and At Atta tach chme ment nt Oste offer beren laenti ststiat M aion ken Bby M ating trng ix Ce Most Bones Are Built Around Cartilage Models Bone Is Is Co Continually Remodeled by by th the Cells Within It Osteoclasts Ar Are Co Controlled by by Si Signals Fr From Os Osteoblasts Fat Cells Can Develop From Fibroblasts Leptin Secreted by Fat Cells Provides Feedback to Regulate Eating Summary

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Complement or Lysis Activation Targets Pathogens for Phagocytosis Toll-like Proteins Proteins and NOD Proteins Proteins Are an Ancient Family of Pattern Recognition Receptors Phagocytic Ce Cells Se Seek, En Engulf, an and De Destroy Pa Pathogens Activated Macrophages Contribute to the Inflammatory Response at Sites of Infection Virus-Infected Cells Take Drastic Measures to Prevent Viral Replication Natural Natur al Killer Killer Cells Cells Induce Induce Viru Virus-Inf s-Infected ected Cells to Kill Kill Themse Themselves lves Dendritic Cells Provide the Link Between the Innate and Adaptive Immune Systems Summary References

Fibroblasts Change Their Character in Response to Chemical Signals The Extracellular Matrix May Influence Connective-Tissue Connective-Tissue Cell

Hemopoietic Stem Cells Can Be Used to Replace Diseased Blood Cells with Healthy Ones Epidermal Stem Cell Populations Can Be Expanded in Culture for Tissue Repair Neural Stem Cells Can Be Manipulated in Culture Neural Neu ral Ste Stem m Cells Cells Can Can Repo Repopul pulate ate the Cen Centra trall Nervou Nervouss Syste System m Stem Cells in the Adult Body Are Tissue-Specific ES Cells Can Make Any Part of the Body Patient-Specific Patient-Specif ic ES Cells Could Solve the Problem of Immune Rejection ES Cel Cells ls Are Use Useful ful for Dru Drug g Disc Discove overy ry and and An Analy alysis sis of Dis Diseas ease e Summary References

Chapter 24 Pathogens, Infection, and Innate Immunity INTRODUCTION TO PATHOGENS Pathogens Have Evolved Specific Mechanisms for Interacting with Their Hosts The Signs and Symptoms of Infection Infection May Be Caused by the Pathogen or by the Host ’s Responses Pathogens Are Phylogenetically Diverse Bac te terial Pathogens Carr y Specialized Virulence Genes Fungal and Protozoan Parasites Have Complex Life Cycles with

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Chapter 25 The Adaptive Immune System

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Multiple Forms All Aspects of Viral Propagation Depend on Host Cell Cell Machinery Machinery Prions Are Infectious Proteins Infectious Disease Agents Are Linked To Cancer, Heart Disease, and Other Chronic Illnesses Summary

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1499 1501

Pat atho hog gen enss Cr Cros osss Pr Prot otec ecti tiv ve Ba Barr rrie ierrs to to Col Colon oniz ize e th the Hos Hostt 1501 15 01 Pathogens That That Colonize Epithelia Must Avoid Clearance by the Host 1502 Intracellular Pathogens Have Mechanisms for Both Entering and Leaving Host Cells 1504 Virus Particles Bind to Molecules Displayed on the Host Cell Surface 1505 Virions Enter Host Cells by Membrane Fusion, Pore Formation, or Membrane Disruption 1506 Bacteria Enter Host Cells by Phagocytosis 1507 Intr In trac acel ellu lula larr Euca Eucary ryot otic ic Par Paras asit ites es Act Activ ivel elyy Inva Invade de Hos Hostt Cel Cells ls 1508 15 08 Man anyy Path thog ogen enss Al Alte terr Mem embr bran ane e Tra rafffic in th the e Ho Host st Ce Cell ll 1511 15 11 Viruses and Bacteria Use the Host Cell Cytoskeleton for Intracellular Movement 1514 Vir iral al In Inffec ecti tion onss Tak ake e Ov Over er th the e Me Meta tabo boli lism sm of th the e Ho Host st Ce Cell ll 1517 15 17 Pathogens Can Alter the Behavior of the Host Organism to Facilitate the Spread of the Pathogen 1518

Lymphocytes Are Required for Adaptive Immunity The Innate and Adaptive Immune Systems Work Together Together B Lymphocytes Develop in the Bone Marrow; T Lymphocytes Develop in the Thymus The Adaptive Immune System Works by Clonal Selection Most Mo st Ant Antig igen enss Act Activ ivat ate e Man Many Diff Differ eren entt Lym Lymph phoc ocyt yte e Clon Clones es Immunological Memory Involves Both Clonal Expansion and Lymphocyte Differentiation Immunological Tolerance Tolerance Ensures That Self Antigens Are Not Normally Attacked Lymphocytes Continuously Circulate Through Peripheral Lymphoid Organs Summary


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B Cells Make Antibodies as Both Cell-Surface Antigen Receptors and Secreted Proteins


A Ty Typi pica call Ant Antib ibod odyy Ha Hass Two Id Iden enti tica call Ant Antig igen en-B -Bin indi ding ng Si Site tess An Anti Antibod bodyy Molec Molecule ule Is Is Compo Composed sed of Heav Heavyy and and Light Light Cha Chains ins There Are Five Classes of Antibody Heavy Heavy Chains, Each with Different Biological Properties The Strength of an Antibody–Antigen Antibody–Antigen Interaction Depends on Both the Number and the Affinity of the Antigen-Binding Sites Antibody Light and Heavy Chains Consist of Constant and Variable Regions The Light and Heavy Chains Are Composed Composed of Repeating Ig Domains An Antigen-Binding Antigen-Binding Site Is Constructed from Hypervariable Hypervariable Loops Summary




Antibody Genes Are Assembled From Separate Gene Segments During B Cell Development Imprecise Joining of Gene Segments Greatly Increases the Diversity of V Regions The Control of V(D)J V(D)J Recombination Ensures That B Cells Are Monospecific Antigen-Driven Somatic Hypermutation H ypermutation Fine-Tunes Fine-Tunes Antibody Responses B Cells Can Switch the Class of Antibody They Make Summary

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Detailed Contents



T Cell Receptors (TCRs) Are Antibodylike Heterodimers Antigen Presentation by Dendritic Cells Can Either Activate or Tolerize T Cells Effector Cytotoxic T Cells Induce Infected Target Target Cells to Kill Themselves Effector Helper T Cells Help Activate Other Cells of the Innate and Adaptive Immune Systems Regulator y T Ce Cells Su Suppress th the Ac Activity of of Ot Other T Ce Cel ls ls T Cells Recognize Foreign Foreign Peptides Bound to MHC Proteins Proteins MHC Proteins Were Identified in Transplantation Reactions Before Their Functions Were Known Class I and Class II MHC Proteins Are Structurally Similar Heterodimers An MHC Protein Binds a Peptide and Interacts with a T Cell Receptor MHC MH C Prot Protei eins ns Hel Help p Direct Direct T Cell Cellss to The Their ir App Appro ropr pria iate te Tar arge gets ts CD4 and CD8 Co-Receptors Bind to Invariant Parts of MHC Proteins Cytotoxic T Cells Recognize Fragments of Foreign Cytosolic Proteins in Association with Class I MHC Proteins Helper T Cells Respond to Fragments of Endocytosed Foreign Protein Associated with Class II MHC Proteins Poten Po tentia tially lly Usef Useful ul T Cell Cellss Are Posi Positiv tively ely Sele Selecte cted d in the the Thymu Thymuss

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Most Developing Cytotoxic and Helper T Cells That Could Be Activated by Self-Peptide–MHC Complexes Are Eliminated in the Thymus Some Organ-Specific Proteins Are Ectopically Expressed in the Thymus Medulla The Function of MHC Proteins Proteins Helps Explain Their Polymorphism Polymorphism Summary

HELPER T CE CELLS AN AND LY LYMPHOCY TE AC ACTIVATION Activated Dendritic Cells Use Multiple Mechanisms to Activate T Cells The Activation of T Cells Is Controlled Controlled by Negative Feedback The Subclass of Effector Helper T Cell Determines the the Nature of the Adaptive Immune Response TH1 Cells Activate Infected Macrophages and Stimulate An Inflammatory Response Antigen Binding to B Cell Receptors (BCRs) Is Only One Step in B Cell Activation Antigen-Specific Helper T Cells Are Essential for Activating Most B Cells A Special Special Class of B Cells Cells Recogni Recognize ze T-Cell T-Cell-Inde -Independe pendent nt Antigens Antigens Immune Recognition Molecules Belong to the Ancient Ig Superfamily Summary References


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Acknowledgments In writing this book we have benefited greatly from the advice of many biologists and biochemists. We would like to thank the following for their suggestions in preparing this edition, as well as those who helped in preparing the first, second, third and fourth editions. (Those who helped on this edition are listed first, those who helped with the first, second, third and fourth editions follow.) Chapter 1: W. Ford Doolittle (Dalhousie University, Canada), Jennifer Frazier (Exploratorium®, San Francisco), Douglas Kellogg (University of California, Santa Cruz), Eugene Koonin (National Institutes of Health), Mitchell Sogin (Woods ( Woods Hole Institute) Chapter 2: Michael Cox (University of Wisconsin, Madison), Christopher Mathews (Oregon State University), Donald Voet (University of Pennsylvania), John Wilson (Baylor College of Medicine) Chapter 3: David Eisenberg (University of California, Los Angeles), Louise Johnson (University of Oxford), Steve Harrison (Harvard University), Greg Petsko (Brandeis University), Robert Stroud (University of California, San Francisco), Janet Thornton Thornton (European Bioinformatics Institute, UK) Chapter 4: David Allis (The Rockefeller University), Adrian Bird (Wellcome Trust Centre, Centre, UK), Gary Felsenfeld (National Institutes of Health), Susan Gasser (University of Geneva, Switzerland), Eric Green (National Institutes of Health), Douglas Koshland (Carnegie Institution of Washington, Baltimore), Ulrich Laemmli (University of Geneva, Switzerland), Michael Lynch (Indiana (I ndiana University), Hiten Madhani (University of California, San Francisco), Elliott Margulies (National Institutes of Health), Geeta Narlikar (University of California, San Francisco), Maynard Olson (University of Washington) Chapter 5: Elizabeth Blackburn (University of California, San Francisco), James Haber (Brandeis University), Nancy Kleckner (Harvard University), Joachim Li (University of California, San Francisco), Thomas Thomas Lindahl (Cancer Research, UK), UK ), Rodney Rothstein (Columbia University), Aziz Sancar (University of North Carolina, Chapel Hill), Bruce Stillman (Cold Spring Harbor Laboratory), Steven West (Cancer Research, UK), Rick Wood (University of Pittsburgh Pittsburgh)) Chapter 6: Raul Andino (University of California, San Francisco), David Bartel (Massachusetts Institute of Technology), Richard Ebright (Rutgers University), Daniel Finley (Harvard University), Joseph Gall (Carnegie Institution of Washington), Michael Green (University of Massachusetts Medical School), Carol Gross (University of California, San Francisco), Christine Guthrie (University of California, San Francisco), Art Horwich ( Yale University School of Medicine), Roger Kornberg (Stanford University), Reinhard Lührman (Max Planck Institute of Biophysical Chemistry, Göttingen), Quinn Mitrovich (University of California, San Francisco), (Harry Noller (University of California, Santa Cruz), Roy Parker (University of Arizona), Robert Sauer

(Massachusetts Institute of Technology), Joan Steitz ( Yale University), Jack Szostak (Harvard Medical School, Howard Hughes Medical Institute), David Tollervey (University of Edinburgh, UK), Alexander Varshavsky (California Institute of Technology), Tech nology), Jonathan Weissman Weissman (University (University of California, San Francisco) Chapter 7: Raul Andino (University of California, San Francisco), David Bartel (Massachusetts Institute of Technology), Technology), Michael Bulger (University of Rochester Medical Center), Michael Green (University of Massachusetts Medical School), Carol Gross (University of California, San Francisco), Frank Holstege (University Medical Center, The Netherlands), Roger Kornberg (Stanford University), Hiten Madhani (University of California, San Francisco), Barbara Panning (University of California, San Francisco), Mark Ptashne (Memorial Sloan-Kettering Center), Ueli Schibler (University of Geneva, Switzerland), Azim Surani (University of Cambridge) Chapter 8: Wallace Marshall [major contribution] (University of California, San Francisco) Chapter 9: Wolfga Wolfgang ng Baumeister (Max Planck Institute of Biochemistry, Martinsried), Ken Sawin (The Wellcome Trust Centre for Cell Biology, UK), Peter Shaw (John Innes Centre, UK), Werner Kühlbrandt (Max Planck Institute of Biophysics Biophysics,, Frankfurt am Main), Ronald Vale (University of California, San Francisco), Jennifer Lippincott-Schwartz Lippincott-Schwartz (National Institutes of Health) Chapter 10: Ari Helenius (Swiss Federal Institute of Technology Zürich, Switzerland), Werner Werner Kühlbrandt (Max Planck Institute of Biophysics, Frankfurt am Main), Dieter Osterhelt (Max Planck Institute of Biochemistry, Martinsried), Kai Simons (Max Planck Institute of Molecular Cell Biology and Genetics, Dresden) Chapter 11: Wolfhard Almers (Oregon Health and Science University), Robert Edwards (University of California, San Francisco), Bertil Hille (University of Washington), Washington), Lily Jan (University of California, San Francisco), Roger Nicoll (University of California, San Francisco), Robert Stroud (University of California, San Francisco), Patrick Williamson (University of Massachusetts, Amherst) Chapter 12: Larry Gerace (The Scripps Research Institute), Ramanujan Hegde (National Institutes of Health), Nikolaus Pfanner (University of Freiburg, Germany), Daniel Schnell (University of Massachusetts Massachusetts,, Amherst), Karsten K arsten Weis (University of California, Berkeley), Susan Wente (Vanderbilt University



Massachusetts,, Medical Center), Pat Williamson (University of Massachusetts Amherst)

Kobe Institute, Japan), Kenneth Yamada (National Institutes of Health)

Chapter 13: Scott Emr (University of California, San Diego), Ben Glick (University of Chicago), Ari Helenius (Swiss Federal Institute of Technology Technology Zürich, Switzerland), Ira Mellman (Yale University), Hugh Pelham (The Medical Research Council, Cambridge), Giampietro Schiavo (London Research Institute), Graham Warren Warren (Yale University), Marino Zerial (Max Planck Institute of Molecular Cell Biology and Genetics, Frankfurt am Main)

Chapter 20: Laura Attardi [substantial contribution] (Stanford University), Anton Berns (Netherlands Cancer Institute, The Netherlands), Michael Bishop (University of California, San Francisco), Fred Fred Bunz (Johns Hopkins), Johann Johann De-Bono (The Institute of Cancer Research, UK), John Dick (University of Toronto, T oronto, Canada), Paul Paul Edwards (University of Cambridge), Douglas Hanahan (University of California, San Francisco), Joseph

Chapter 14: Michael Gray (Dalhousie University), Andrew Halestrap (University of Bristol, UK), Werner Kühlbrandt (Max Planck Institute of Biophysics, Frankfurt am Main), Craig Thompson (Abramson (Abramson Family Cancer Research Research Institute, University of Pennsylvania), Michael Yaffe (University of California, San Diego)

Lipsick (Stanford UniversityBruce School of Medicine), Scott Spring Harbor Laboratory), Ponder (University ofLowe (Cold Cambridge), Craig Thompson (University of Pennsylva Pennsylvania), nia), Ian Tomlinson T omlinson (Cancer Research, UK), Robert Weinberg Weinberg (Massachusetts Institute of Tech Technology) nology)

Chapter 15: Nicholas Harberd [substantial contribution] (John Innes Centre, UK), Henry Bourne (University of California, San Francisco), Dennis Bray (University of Cambridge), James Briscoe (National Institute for Medical Research, UK), James Ferrell (Stanford University), Matthew Freeman Freeman (Laboratory of Molecular Biology, UK), Alfred Gilman (The University of Texas Southwestern Medical Center), Sankar Ghosh (Yale University School of Medicine), Alan Hall (Memorial Sloan-Kettering Cancer Center), Carl-Henrik Heldin (Ludwig Institute for Cancer Research, Sweden), Irvine (University of Cambridge), Michael Karin (UniversityRobin of California, San Diego), Elliott Meyerowitz (California Institute of Technology), Roel Nusse (Stanford University), Tony Tony Pawson (Mount Sinai Hospital, Toronto), Julie Pitcher (University College London), Len Stephens (The Babraham Institute, UK) Chapter 16: Julie Theriot [major contribution] (Stanford University), Henry Bourne (University of California, San Francisco), Larry Goldstein (University of California, San Diego), Alan Hall (MRC Laboratory for Molecular Biology and Cell Biology, UK), Joe Howard (Max Planck Institute of Molecular Cell Cell Biology and Genetics, Dresden), Laura Machesky (The University of Birmingham, UK), Timothy Mitchison (Harvard Medical School), Ronald Vale (University of California, San Francisco) Chapter 17: David Morgan [major contribution] (University of California, San Francisco), Arshad Desai (University of California, San Diego), Bruce Edgar (Fred Hutchinson Research Center Center, , Seattle), Michael Glotzer (UniversityCancer of Chicago), Rebecca Heald (University of California, Berkeley), Eric Karsenti K arsenti (European Molecular Biology Laboratory, Germany), Kim Nasmyth (University of Oxford), Jonathan Pines (Gurdon Institute, Cambridge), Charles Sherr (St. Jude Children’s Children’s Hospital) Chapter 18: Xiaodong Wang [substantial contribution] (The University of Texas Texas Southwestern Medical School), Jerry Adams (The Walter and Eliza Hall Institute of Medical Research, Australia), Douglas Green (St. Jude Children’s Children’s Hospital), Shigekazu Nagata (Kyoto University, Japan) Chapter 19: Jeffrey Axelrod (Stanford University Medical Center), Walter Birchmeier (Max-Delbrück Center for Molecular Medicine, Germany), Keith Burridge (University of North Carolina, Chapel Hill), John Couchman (Imperial College, UK), Caroline Damsky (University of California, San Francisco), Matthias Falk (Lehigh University), David Garrod (University of Manchester Manchester,, UK), Daniel Goodenough (Harvard Medical School), Martin Humphries (University of Manchester, UK), Richard Hynes (Massachusetts Institute of Technology), Ken Keegstra (Michigan State University), Morgan Sheng (Massachusetts Institute of Technology), Charles Streuli (University of Manchester, UK), Masatoshi Takeichi (RIKEN

Chapter 21: Patricia Calarco (University of California, San Francisco), John Carroll (University College London), Abby Dernburg (University of Califonia, Berkeley), Scott Hawley (Stowers Institute for Medical Research, Kansas City), Neil Hunter (University of California, Davis), Nancy Kleckner (Harvard University), Anne McLaren (Wellcome/ Cancer Research Campaign Institute, Cambridge), Diana Myles (University of California, Davis), Terry Orr-Weaver (Massachusetts Institute of Technology), T echnology), Renee Reijo (University of California, California, San Francisco), Gerald Schatten (Pittsburgh Development Center), Azim Surani (The Gurdon Institute, UK), Paul Wassarman Wassarman (Mount Sinai School of Medicine) Chapter 22: Julie Ahringer (The Gurdon Institute, UK), Konrad Basler (University of Zürich, Switzerland), Richard Harland (University of California, Berkeley), Brigid Hogan (Duke University), Kenneth Irvine (Rutgers University), Daniel St. Johnson (The Gurdon Institute, I nstitute, UK), Elliott Meyerowitz (California Institute of Technology), William William McGinnis (University of California, San Diego), Elizabeth Robertson (The Wellcome Trust Trust Centre for Human Genetics, UK), Francois Schweisguth (French (French National Centre for Scientific Research, France), Jim Smith ( The Gurdon Institute, UK), Nicolas Tapon (London Research Institute) Chapter 23: Ralf Adams (London Research Institute), I nstitute), Hans Clevers (Hubrecht Institute, The Netherlands), Jeffrey Gordon (Washington University, University, St. Louis), Holger Gerhardt (London Research Institute), Simon Hughes (Kings College, UK), Daniel Louvard (Institut Curie, France), Bjorn Olsen (Harvard Medical School), Stuart Orkin (Harvard (Har vard Medical School), Thomas Reh (University of Washington, Washington, Seattle), Austin Smith (University of Edinburgh, UK), Charles Streuli ( The University of Manchester, Manchester, UK), Fiona Watt (Cancer Research Institute, UK) Chapter 24: Julie Theriot [major contribution] (Stanford University), Michael Bishop (University of California, San Francisco), Harald von Boehmer (Harvard Medical School), Lynn Enquist (Princeton University), Stan Falkow (Stanford University), Douglas Fearon (University of Cambridge), Lewis Lanier (University of California, San Francisco), Richard Locksley (University of California, San Francisco), Daniel Portnoy (University of California, Berkeley), Caetano Reis e Sousa (Cancer Research, UK), Ralph Steinman (The Rockefeller University), Gary Ward (University of Vermont) Chapter 25: Harald von Boehmer (Harvard Medical School), Douglas Fearon (University of Cambridge), Lewis Lanier (University of California, San Francisco), Philippa Marrack (National Jewish Medical and Research Center, Center, Denver), Michael Neuberger (University of Cambridge), Michael Nussenzweig (Rockefeller University), William Paul (National Institutes of

xxv xx vii iiii

Ack ckno now wle led dgm gme ent ntss

Health), Klaus Rajewsky (Harvard Medical School), Caetano Reis e Sousa (Cancer Research, UK), Ralph Steinman (The Rockefeller University).

First, second, third, and fourth editions David Agard

Sarah Elgin ( Washin Washington gton University, St. Louis), Ruth Ellman (Institute of Cancer Research, Sutton, UK), Beverly Emerson (The Salk Institute), Charles Emerson (University of Virginia), Scott Emr (University of California, San Diego), Sharyn Endow (Duke University), Tariq Tariq Enver (Institute (I nstitute of Cancer Research, London), David Epel (Stanford University), Gerard Evan (University of California, Comprehensive Comprehensive Cancer Center), Ray Evert (University of Wisconsin, Madison), Stanley Falkow (Stanford University), Gary Felsenfeld (National Institutes of Health), Stuart Ferguson (University of Oxford), Christine Field (Harvard Medical School),

(University of California, San Francisco), Michael Akam (University of Cambridge), Fred Alt (CBR Institute for Biomedical Research, Boston), Linda Amos (MRC Laboratory of Molecular Biology, Cambridge), Raul Andino (University of California, San Francisco), Clay Armstrong (University of Pennsylvania), Martha Arnaud (University of California, San Francisco), Spyros ArtavanisTsakonas Tsak onas (Harvard Medical School), Michael Ashburner (University of Cambridge), Jonathan Ashmore (University College London), Tayna Tayna Awabdy (University of California, San Francisco), Peter Baker (deceased), David Baldwin (Stanford University), Michael Banda (University of California, San Francisco), Cornelia Bargmann (University of California, San Francisco), Ben Barres (Stanford University), David Bartel (Massachusetts Institute of Technology), T echnology), Michael Bennett (Albert Einstein College College of Medicine), Darwin Berg (University of California, San Diego), Merton Bernfield (Harvard Medical School), Michael Berridge (The

Gary Firestone (University of California, Berkeley), Gerald Fischbach (Columbia University), Robert Fletterick (University of California, San Francisco), Harvey Florman ( Tufts University), Judah Folkman (Harvard Medical School), Larry Larr y Fowke (University of Saskatchewan, Canada), Daniel Friend (University of California, San Francisco), Elaine Fuchs (University of Chicago), Joseph Gall (Yale University), Richard Gardner (University of Oxford), Anthony Gardner-Medwin (University College London), Peter Garland (Institute of Cancer Research, London), Walter Walter Gehring (Biozentrum, University of Basel), Benny Geiger (Weizmann Institute of Science, Rehovot, Israel), Larry Gerace (The Scripps Research Institute), John Gerhart (University of California, Berkeley), Günther Gerisch (Max Planck Institute I nstitute of Biochemistry, Martinsried), Frank Gertler (Massachusetts Institute of Technology), Tech nology), Sankar Ghosh (Yale University University School of Medicine), Reid Gilmore (University of Massachusetts Massachusetts,, Amherst), Bernie

Babraham Institute, Cambridge), David Birk (UMNDJ—Robert Wood Johnson Medical School), Michael Bishop (University of California, San Francisco), Tim Bliss (National Institute for Medical Research, London), Hans Bode (University of California, Irvine), Piet Borst (Jan Swammer Swammerdam dam Institute, University of Amsterdam), Henry Bourne (University of California, San Francisco), Alan Boyde (University College London), Martin Brand (University of Cambridge), Carl Branden (deceased), Andre Brandli (Swiss Federal Institute of Technology, Technology, Zurich), Mark Bretscher (MRC Laboratory of Molecular Biology, Cambridge), Marianne BronnerFraser (California Institute of Technology), Robert Brooks (King’s College London), Barry Brown (King’s (King’s College London), Michael Brown (University of Oxford), Steve Burden (New York York University of Medicine), Max Burger (University of Basel), Stephen Burley (SGX Pharmaceuticals), Keith Keith Burridge (University of North Carolina, Chapel Hill), John Cairns (Radcliffe Infirmary, Oxford),

Gilula (deceased), Charles Gilvarg (Princeton University), Michael Glotzer (University of Vienna, Austria), Larry Goldstein (University of California, San Diego), Bastien Gomperts (University College Hospital Medical School, London), Daniel Goodenough (Harvard Medical School), Jim Goodrich (University of Colorado, Boulder), Peter Gould (Middlesex Hospital Medical School, London), Alan Grafen (University of Oxford), Walter Gratzer (King’s College London), Howard Green (Harvard University), Michael Green (University of Massachusetts, Amherst), Leslie Grivell (University of Amsterdam, The Netherlands), Carol Gross (University of California, San Francisco), Frank Grosveld (Erasmus Universiteit, The Netherlands), Michael Grunstein Grunstein (University of California, Los Angeles), Barry Gumbiner (Memorial Sloan-Kettering Cancer Center), Brian Gunning (Australian National University, University, Canberra), Christine Guthrie (University of California, San Francisco), Ernst Hafen (Universitat Zurich), David Haig (Harvard (Har vard University), Alan

Zacheus Cande (University of California, Berkeley), Lewis Cantley (Harvard Medical School), Charles Cantor (Columbia University), Roderick Capaldi (University of Oregon), Mario Capecchi (University of Utah), Michael Carey (University of California, Los Angeles), Adelaide Carpenter (University of California, San Diego), Tom T om Cavalier-Smith (King’s (King’s College London), London), Pierre Chambon (University of Strasbourg), Enrico Coen (John Innes Institute, Norwich, UK), Philip Cohen (University of Dundee, Scotland), Robert Cohen (University of California, San Francisco), Stephen Cohen (EMBL Heidelberg, Germany), Roger Cooke (University of California, San Francisco), John Cooper ( Washing Washington ton University School of Medicine, St. Louis), Nancy Craig (Johns Hopkins University), James Crow (University of Wisconsin, Madison), Stuart Cull-Candy (University College London), Leslie Dale (University College London), Michael Dexter (The Wellcome Trust, Trust, UK), Anthony DeFranco (University of California, San Francisco),

Hall (MRC Laboratory for Molecular Biology and Cell Biology, London), Jeffrey Hall (Brandeis University), John Hall (University of Southampton, UK), Zach Hall (University of California, San Francisco), David Hanke (University of Cambridge), Nicholas Harberd (John Innes Centre, Norwich, UK), UK ), Graham Hardie (University of Dundee, Scotland), Richard Harland (University of California, Berkeley), Adrian Harris (Cancer Research, UK), John Harris (University of Otago, New Zealand), Stephen Harrison (Harvard University), Leland Hartwell (University of Washin Washington, gton, Seattle), Adrian Harwood (MRC Laboratory for Molecular Cell Biology and Cell Biology Unit, London), John Heath (University of Birmingham, UK), Ari Helenius ( Yale University), Richard Henderson (MRC Laboratory of Molecular Biology, Cambridge), Cambridge), Glenn Herrick (University of Utah), Ira Herskowitz (deceased), Bertil Hille (University of Washington, Washington, Seattle), Alan Hinnebusch (National Institutes of Health, Bethesda), Nancy Hollingsworth

Christopher Dobson (University of Cambridge), Russell Doolittle (University of California, San Diego), Julian Downward (Cancer Research, UK), Keith Dudley (King’ (King’ss College London), Graham Dunn (MRC Cell Biophysics Unit, London), Jim Dunwell (John Innes Institute, Norwich, UK), Paul Edwards (University of Cambridge), Robert Edwards (University of California, San Francisco), David Eisenberg (University of California, Los Angeles),

(State University of New York, Stony Brook), Leroy Hood (Institute for Systems Biology, Seattle), John Hopfield (Princeton University), Robert Horvitz (Massachusetts Institute of Technology), Technology), David Housman (Massachusetts Institute of Technology), Jonathan Howard (University of Washington, Washington, Seattle), James Hudspeth (The Rockefeller University), Simon Hughes (King’s College London), Martin Humphries (University of Manchester Manchester,, UK), Tim Hunt

Glossary Eleanor Lawrence, Sherry Granum Readers David Kashatus (Duke University), Emmanuel Kreidl (University of Vienna, Austria), Nick Rudzik (University of Toronto, Canada), Dea Shahinas (University of Toronto, Canada)



(Cancer Research, UK), Laurence Hurst (University of Bath, UK), UK ), Jeremy Hyams (University College London), Tony Tony Hyman (Max Planck Institute of Molecular Cell Biology & Genetics, Dresden), Richard Hynes (Massachusetts Institute of Technology), Philip Ingham (University of Sheffield, UK), Norman Iscove (Ontario Cancer Institute, Toronto), Toronto), David Ish-Horowicz (Cancer Research, UK), Lily Jan (University of California, San Francisco), Charles Janeway (deceased), Tom Jessell (Columbia University), Arthur Johnson (Texas A & M University), Andy Johnston (John Innes Institute, Norwich, UK), E.G. Jordan (Queen Elizabeth College,

N.A. Mitchison (University College London), Tim Mitchison (Harvard Medical School), Peter Mombaerts ( The Rockefeller University), Mark Mooseker (Yal ( Yale e University), David Morgan (University of California, San Francisco), Michelle Moritz (University of California, San Francisco), Montrose Moses (Duke University), Keith Mostov (University of California, San Francisco), Anne Mudge (University College London), Hans Müller-Eberhard (Scripps Clinic and Research Institute), Alan Munro (University of Cambridge), J. Murdoch Mitchison (Harvard (Har vard University), Richard Myers (Stanford University), Diana Myles (University of California,

London), Ron Kaback (University of California, Los Angeles), Ray Keller (University of California, Berkeley), Douglas Kellogg (University of California, Santa Cruz), Regis Kelly (University of California, San Francisco), John Kendrick-Jones (MRC Laboratory of Molecular Biology, Cambridge), Cynthia Kenyon (University (University of California, San Francisco), Roger Keynes (University of Cambridge), Judith Kimble (University of Wisconsin, Madison), Robert Kingston (Massachusetts General Hospital), Marc Kirschner (Harvard University), Richard Klausner (National Institutes of Health), Nancy Kleckner (Harvard University), Mike Klymkowsky (University of Colorado, Boulder), Kelly Komachi (University of California, San Francisco), Eugene Koonin (National Institutes of Health), Juan Korenbrot (University of California, San Francisco), Tom Tom Kornberg (University of California, San Francisco), Stuart Kornfeld ( Washin Washington gton University, St. Louis), Daniel Koshland (University of California, Berkeley), Marilyn Kozak

Davis), Andrew Murray (Harvard University), Mark E. Nelson (University of Illinois, Urbana-Champaign), Michael Neuberger (MRC Laboratory of Molecular Biology, Cambridge), Walter Walter Neupert (University of Munich, Germany), David Nicholls (University of Dundee, Scotland), Suzanne Noble (University of California, San Francisco), Harry Noller (University of California, Santa Cruz), Jodi Nunnari (University of California, Davis), Paul Nurse (Cancer Research, UK), Duncan O’Dell (deceased), Patrick O’Farrell (University of California, San Francisco), Maynard Olson (University of Washington, Seattle), Stuart Orkin (Children’s Hospital, Boston), Terri Orr-Weaver (Massachusetts Institute of Technology), T echnology), Erin O’Shea (Harvard University), William William Otto (Cancer Research, UK), John Owen (University of Birmingham, UK), Dale Oxender (University of Michigan), George Palade (deceased), Barbara Panning (University of California, San Francisco), Roy Parker (University of Arizona, Tucson), William W.

(University of Pittsburgh), Mark Krasnow (Stanford University), Werner Kühlbrandt (Max Planck Institute for Biophysics, Frankfurt Frankfurt am Main), John Kuriyan (University of California, Berkeley), Robert Kypta (MRC Laboratory for Molecular Cell Biology, London), Peter Lachmann (MRC Center, Cambridge), Ulrich Laemmli (University of Geneva, Switzerland), Trevor Trevor Lamb (University of Cambridge), Hartmut Land (Cancer Research, UK), David Lane (University of Dundee, Scotland), Jane Langdale (University of Oxford), Jay Lash (University of Pennsylvania), Peter Lawrence (MRC Laboratory of Molecular Biology, Cambridge), Paul Lazarow (Mount Sinai School of Medicine), Robert J. Lefkowitz (Duke University), Michael Levine (University of California, Berkeley), Warren Levinson (University of California, San Francisco), Alex Levitzki (Hebrew University,, Israel), Ottoline Leyser (University of York, UK), Joachim University Li (University of California, San Francisco), Tomas Lindahl (Cancer Research, UK), Vishu Lingappa (University of California, San

Parson (University of Washington, Seattle), Terence Partridge (MRC Clinical Sciences Centre, London), William E. Paul (National Institutes of Health), Tony Pawson (Mount Sinai Hospital, Toronto), Hugh Pelham (MRC Laboratory of Molecular Biology, Cambridge), Robert Perry (Institute of Cancer Research, Philadelphia), Greg Petsko (Brandeis University), Gordon Peters (Cancer Research, UK), David Phillips ( The Rockefeller University), Jeremy PickettPickettHeaps (The University of Melbourne, Australia), Julie Pitcher (University College London), Jeffrey Pollard (Albert Einstein College of Medicine), Tom Pollard (Yale University), Bruce Ponder (University of Cambridge), Dan Portnoy (University of California, Berkeley), James Priess (University of Washington, Seattle), Darwin Prockop (Tulane University), Dale Purves (Duke University), Efraim Racker (Cornell University), Jordan Raff (Wellcome/CRC Institute, Cambridge), Klaus Rajewsky (University of Cologne, Germany), George Ratcliffe (University of Oxford), Elio

Francisco), Jennifer Lippincott-Schwartz Lippincott-Schwartz (National Institutes of Health, Bethesda), Dan Littman (New York University School of Medicine), Clive Lloyd (John Innes Institute, Norwich, UK), Richard Losick (Harvard University), Robin Lovell-Badge (National Institute for Medical Research, London), Shirley Lowe (University of California, San Francisco), Laura Machesky (University of Birmingham, UK), James Maller (University of Colorado Medical School), Tom Tom Maniatis (Harvard University), Colin Manoil (Harvard Medical School), Philippa Marrack (National Jewish Medical and Research Center, Center, Denver), Mark Marsh (Institute of Cancer Research, London), Gail Martin (University of California, San Francisco), Paul Martin (University College London), Joan Massagué (Memorial Sloan-Kettering Cancer Center), Brian McCarthy (University of California, Irvine), Richard McCarty (Cornell University), William McGinnis (University of California, Davis), Anne McLaren ( Wellcome/Ca Wellcome/Cancer ncer Research Campaign

Raviola (Harvard Medical School), Martin Rechsteiner (University (University of Utah, Salt Lake City), David Rees (National Institute for Medical Research, London), Louis Reichardt (University of California, San Francisco), Fred Richards (Yale University), Conly Rieder (Wadsworth Center, Albany), Phillips Robbins (Massachusetts Institute of Technology), Elaine Robson (University of Reading, UK), Robert Roeder (The Rockefeller University), Joel Rosenbaum (Yale University), Janet Rossant (Mount Sinai Hospital, Toronto), Jesse Roth (National Institutes of Health), Jim Rothman (Memorial Sloan-Kettering Sloan-Kett ering Cancer Center), Erkki Ruoslahti (La Jolla Cancer Research Foundation), Gary Ruvkun (Massachusetts General Hospital), David Sabatini (New York University), Alan Sachs (University of California, Berkeley), Alan Sachs (University of California, Berkeley), Edward Salmon (University of North Carolina, Chapel Hill), Joshua Sanes (Harvard University), Peter Sarnow (Stanford University), Lisa Satterwhite (Duke University

Institute, Cambridge), Frank McNally (University of California, Davis), Freiderick Meins (Freiderich Miescher Institut, Basel), Stephanie Mel (University of California, San Diego), Ira Mellman (Yale University), Barbara Meyer (University of California, Berkeley), Elliot Meyerowitz (California Institute of Technology), Chris Miller (Brandeis University), Robert Mishell (University of Birmingham, UK), Avrion Mitchison (University College London),

Medical School), Howard Schachman (University of California, Berkeley), Gottfried Schatz (Biozentrum, University of Basel), Randy Schekman (University of California, Berkeley), Richard Scheller (Stanford University), Giampietro Schiavo (Cancer Research, UK), Joseph Schlessinger (New York York University Medical Center), Michael Schramm (Hebrew University), Robert Schreiber (Scripps Clinic and Research Institute), James Schwartz (Columbia



University), Ronald Schwartz (National Institutes of Health), François Schweisguth Schweisguth (ENS, Paris), John Scott (University of Manchester,, UK), John Sedat (University of California, San Manchester Francisco), Peter Selby (Cancer Research, UK), Zvi Sellinger (Hebrew University, University, Israel), Gregg Semenza (Johns Hopkins University), Philippe Sengel (University of Grenoble, France), Peter Shaw (John Innes Institute, Norwich, UK), Michael Sheetz (Columbia University), David Shima (Cancer Research, UK), Samuel Silverstein (Columbia University), Kai Simons (Max Planck Institute of Molecular Cell Biology and Genetics, Dresden), Melvin

Medicine, John Radcliffe Hospital, Oxford), Paul Travers (Anthony Nolan Research Institute, London), Robert Trelstad (UMDNJ, Robert Wood Johnson Medical School), Anthony Trewavas (Edinburgh University, University, Scotland), Nigel Unwin (MRC Laboratory of Molecular Biology, Cambridge),Victor Vacquier (University of California, San Diego), Harry van der Westen (Wageningen, The Netherlands), Tom Tom Vanaman (University of Kentucky), Harold Varmus (Sloan-Kettering Institute), Alexander Varshavsky (California Institute of Technology), Madhu Wahi (University of California, San Francisco), Virginia Walbot (Stanford University),

I. Simon (California Institute of Technology), Jonathan Slack (Cancer Research, UK), Alison Smith (John Innes Institute, Norfolk, UK), John Maynard Smith (University of Sussex, UK), Frank Solomon (Massachusetts Institute of Technology), Michael Solursh (University of Iowa), Bruce Spiegelman (Harvard Medical School), Timothy Springer (Harvard Medical School), Mathias Sprinzl (University of Bayreuth, Germany), Scott Stachel (University of California, Berkeley), Andrew Staehelin (University of Colorado, Boulder), David Standring (University of California, San Francisco), Margaret Stanley (University of Cambridge), Martha Stark (University of California, San Francisco), Wilfred Wilfred Stein (Hebrew University, Israel), Malcolm Steinberg (Princeton University), Paul Sternberg (California Institute of Technology), Chuck Stevens (The Salk Institute), Murray Stewart (MRC Laboratory of Molecular Biology, Cambridge), Monroe Strickberger (University of Missouri, St. Louis), Robert Stroud

Frank Walsh (Glaxo-Smithkline-Beecham, (Glaxo-Smithkline-Beecham, UK), Trevo Trevorr Wang (John ( John Innes Institute, Norwich, UK), Yu-Lie Wang Wang ( Worcest Worcester er Foundation for Biomedical Research), Anne Warner (University College London), Graham Warren (Yale University School of Medicine), Paul Wassarman Wassarman (Mount Sinai School of Medicine), Fiona Watt (Cancer Research, UK), Clare Waterman-Storer Waterman-Storer (The Scripps Research Institute), Fiona Watt (Cancer Research, UK), John Watts (John Innes Institute, Norwich, UK), UK ), Klaus Weber (Max Planck Institute for Biophysical Chemistry, Göttingen), Martin Weigert (Institute of Cancer Research, Philadelphia), Harold Weintraub (deceased), Karsten Weis (University of California, Berkeley), Irving I rving Weissman Weissma n (Stanford University), Jonathan Weissman (University ( University of California, San Francisco), Norman Wessells (Stanford University), Judy White (University of Virginia), Steven West West (Cancer Research, UK), William Wickner (Dartmouth College), Michael Wilcox (deceased), Lewis T. Williams Williams (Chiron Corporation),

(University of California, San Francisco), Michael Stryker (University of California, San Francisco), William Sullivan (University of California, Santa Cruz), Daniel Szollosi (Institut National de la Recherche Agronomique, Agronomique, France), Jack Szostak (Massachusetts General Hospital), Masatoshi Takeichi Takeichi (Kyoto University), Clifford Tabin Tabin (Harvard Medical School), Diethard Tautz Ta utz (University of Cologne, Germany), Julie Theriot Theriot (Stanford University), Roger Thomas (University of Bristol, UK), Vernon Thornton (King’s College London), Cheryll Tickle (University of Dundee, Scotland), Jim Till (Ontario Cancer Institute, Toronto), Toronto), Lewis Tilney (University of Pennsylvania), Nick Tonks (Cold Spring Harbor Laboratory), Alain Townsend Townsend (Institute of Molecular

Keith Willison (Chester Beatty Laboratories, London), John Wilson (Baylor University), Alan Wolffe (deceased), Richard Wolfenden Wolfenden (University of North Carolina, Chapel Hill), Sandra Wolin (Y ( Yale University School of Medicine), Lewis Wolpert (University College London), Rick Wood (Cancer Research, UK), Abraham Worcel Worcel (University of Rochester), Nick Wright (Cancer Research, UK), John Wyke (Beatson Institute for Cancer Research, Glasgow), Keith Yamamoto (University of California, San Francisco), Charles Yocum Yocum (University of Michigan, Ann Arbor), Peter Yurchenco Yurchen co (UMDNJ, Robert Wood Johnson Medical School), Rosalind Zalin (University College London), Patricia Zambryski (University of California, Berkeley).


A Note to the Reader Structure of the Book Although the chapters of this book can be read independently of one another, they are arranged in a logical sequence of five parts. The first three chapters of Part I cover elementary principles and basic biochemistry. They can serve either as an introduction for those who have not studied biochemistry or as a refresher course for those who have. Part II deals with the storage, expression and transmission of genetic information. Part III deals with the principles of the main experimental methods for investigating cells. It is not necessary to read these two chapters in order to understand the later chapters, but a reader will find it a useful reference. Part IVdiscusses IV discusses the internal organization of the cell. Part V follows the behavior of cells in multicellular systems, starting with cell–cell junctions and extracellular matrix and concluding with two t wo chapters on the immune system. Chapters 21–25 can be found on the Media DVD-ROM which is packaged with each book, providing increased portability for students. End-of-Chapter Problems A selection of problems, written by John Wilson and Tim Hunt, now appears in the text at the end of each chapter. The complete solutions to these problems can be found inMolecular inMolecular Biology of the Cell, Fifth Edition: The Problems Book. References A concise list of selected references references is included included at the end of each chapter. chapter. These are arranged in alphabetical order under the main chapter section headings. These references frequently include the original papers in which important discoveries were first reported. Chapter 8 includes several tables giving the dates of crucial developments withtothe names of theindividual scientists scientists. involved. Elsewhere in the book the policy along has been avoid naming Media Codes Media codes are integrated throughout the text to indicate when relevant videos and animations are available on the DVD-ROM. The four-letter codes are enclosed in brackets and highlighted in color, like this <ATCG> <ATCG>.. The interface for the Cell Biology Interactive media player on the DVD-ROM contains a window where you enter the 4-letter code. When the code is typed into the interface, the corresponding media item will load into the media player player.. Glossary Terms Throughout the book, boldface type has been used to highlight key terms at the point in a chapter where the main discussion of them occurs. Italic Italicis is used to set off important terms with a lesser degree of emphasis. At the end of the book is the expanded glossary, covering technical terms that are part of the common currency of cell biology; it is intended as a first resort for a reader who encounters an unfamiliar term used without explanation. Nomenclature for Genes and Proteins Each species has its own conventions for naming genes; the only common feature is that they are always set in italics. In some species (such as humans), gene names are spelled out all in capital letters; in other species (such as zebrafish),

all in lower case; in yet others (most mouse genes), with the first letter in upper


A No Note to to th the Re Reader

case and rest in lower case; or (as in Drosophila Drosophila)) with different combinations of upper and lower case, according to whether the first mutant allele to be discovered gave a dominant or recessive phenotype. Conventions for naming protein products are equally varied. This typographical chaos drives everyone crazy. It is not just tiresome and absurd; it is also unsustainable. We cannot independently define a fresh convention for each of the next few million species whose genes we may wish to study. Moreover, there are many occasions, especially in a book such as this, where we need to refer to a gene generically, without specifying the mouse version, thethey human version, the chick orofthe version, because are all equivalent for theversion, purposes thehippopotamus discussion. What convention then should we use? We W e have decid decided ed in this book to cast aside the conventi conventions ons for indivi individual dual species and follow a uniform rule: we write all gene names, like the names of people and places, with the first letter in upper case and the rest in lower case, but all in italics, thus:Apc thus: Apc, Bazooka Bazooka,, Cdc2, Dishevell Dishevelled, ed, Egl1 Egl1.. The corresponding protein, where wher e it is named after the gene, will be written in the same way, way, but in roman rather than italic letters: Apc, Bazooka, Cdc2, Dishevelled, Egl1. When it is necessary to specify the organism, this can be done with a prefix to the gene name. For completeness, we list a few further details of naming rules that we shall follow. In some instances an added letter in the gene name is traditionally used to distinguish between genes that are related by function or evolution; for those genes we put that letter in upper case if it is usual to do so (LacZ ( LacZ,, Rec RecA, A, Ho HoxA4 xA4). ). We use no hyphen to separate added letters or numbers from the rest of the name. Proteins to arethem morebefore of a problem. of them Such have names their own right, assigned the geneMany was named. proteinin names take many forms, although most of them traditionally begin with a lower-case letter (actin, hemoglobin, catalase), like the names of ordinary substances (cheese, nylon), unless they are acronyms (such as GFP GFP,, for Green Fluorescent Protein, or BMP4, for Bone Morphogenetic Protein #4). To force all such protein names into a uniform style would do too much violence to established usages, and we shall simply write them in the traditional way (actin, GFP GFP,, etc.). For the t he corresponding gene names in all these cases, we shall nevertheless follow our standard rule: Actin,, Hemoglobin Actin Hemoglobin,, Catalase, Bmp4 Bmp4,, Gfp Gfp.. Occasionally in our book we need to highlight a protein name by setting it in italics for emphasis; the intention will generally be clear from the context. For those who wish to know them, the Table below shows some of the official conventions for individual species—conventions that we shall mostly violate in this book, in the manner shown. SPECIES-SPECIFIC CONVENTIO CONVENTION N ORGANISM Mouse

Human Zebrafish Caenorhabditis Drosophila

Yeast Saccharomycess cerevisiae (budding yeast) Saccharomyce Schizosaccharomyces Schizosaccharomyc es pombe (fission yeast) Arabidopsis E. coli




Hoxa4 Bmp4 integrin a-1, -1, Itga1 HOXA4 cyclops, cyc unc-6 sevenless, sev (named after recessive mutant phenotype) Deformed, Dfd( Dfd (named after dominant mutant phenotype)

Hoxa4 BMP4 integrin a1 HOXA4 Cyclops, Cyc UNC-6 Sevenless, SE SEV

HoxA4 Bmp4 Integrin a1, 1, Itga1 HoxA4 Cyclops, Cyc Unc6 Sevenless, Sev

HoxA4 BMP4 integrin a1 HoxA4 Cyclops, Cyc Unc6 Sevenless, Sev

Deformed, DFD

Deformed, Dfd

Deformed, Dfd

CDC28 Cdc2 GAI uvrA

Cdc28, Cdc28p Cdc2, Cdc2p GAI UvrA

Cdc28 Cdc2 Gai UvrA

Cdc28 Cdc2 GAI UvrA

A Note to the Reader

Ancillaries Molecular Biology of the Cell, Molecular Cell, Fifth Edition:The Edition: The Problems Book by John Wilson and Tim Hunt (ISBN: 978-0-8153-4110-9) The Problems Bookis Book is designed to help students appreciate the ways in which experiments and simple calculations can lead to an understanding of how cells work. It provides provides problems to accompany Chapters 1–20 ofMolecular ofMolecular Biology of the Cell. Each chapter of problems is divided into sections that correspond to those of the main textbook and review key terms, test for understanding basic concepts, and pose research-based problems. problems.Molecular Biology of the Cell,Fifth Cell, Fifth Edition: The Problems Problems Bookshould Bookshould be useful for homework assignments and as a basis for class discussion. It could even provide ideas for exam questions. Solutions for all of the problems are provided on the CD-ROM which accompanies the book. Solutions for the end-of-chapter problems in the main textbook are also found in The Problems Book. MBoC5Media DVD-ROM The DVD included with every copy of the book contains the figures, tables, and micrographs from the book, pre-loaded into Powe PowerPoint rPoint󰂮 presentations, one for each chapter. A separate folder contains individual versions of each figure, table, and micrograph in JPEG format. The panels are available in PDF format. There are also over 125 videos, animations, molecular structure tutorials, and high-resolution micrographs on the DVD. The authors have chosen to include material that not only reinforces basic concepts but also expands the content and scope of the book. The multimedia can be accessed either as individual files or through the Interactive media player. As discussed above, the media player has Cell beenBiology programmed to work with the Media Codes integrated throughout the book. A complete table of contents and overview of all electronic resources is contained in the MBoC5 Media Viewing Guide, a PDF file located on the root level of the DVD-ROM and in the Appendix of the media player. The DVD-ROM also contains Chapters 21–25 which cover multicellular systems. The chapters are in PDF format and can be easily printed or searched using Adobe®Acrobat® Reader or other PDF software. Teaching Supplements Teaching Upon request, teaching supplements forMolecular for Molecular Biology of the Cell are available to qualified instructors.

MBoC5 Transparency Set Provides 200 full-color overhead acetate transparencies of the most important figures from the book. MBoC5 Test Questions A selection of test questions will be available. Written by Kirsten Benjamin (Amyris Biotechnologies, Emeryville, California) and Linda Huang (University of Massachusetts, Boston), these thought questions will test students’ understanding of the chapter material. MBoC5 Lecture Outlines Lecture outlines created from the concept heads for the text are provided. Garland Science Classwire™ All of the teaching supplements on the DVD-ROM DVD-ROM (these include figures figures in PowPowerPoint and JPEG format; Chapters 21–25 in PDF format; 125 videos, animations, and movies) and the test questions and lecture outlines are available to qualified instructors online at the Garland Science Classwire™Web site. site. Garland Science Classwire™ offers access to other instructional resources from all of the Garland Science textbooks, and provides free online course management tools. For additional information, please visit or e-mail [emailprotected] (Classwire (Classwireis is a trademark of Chalkfree, Inc.) Adobe and Acrobat are either registered registered trademarks or trademarks of Adobe Systems Systems Incorporated in the United States and/or other countries PowerPoint is either a registered trademark or trademark of Microsoft Corporation in the United States and/or other countries


Index If you are using ISBN: 0-8153-4105-5 or ISBN: 0-8153-4106-2 (located on the bar code on the back cover), pages 1269–1601 are found in the Chapters 21–25 folder on the DVD that accompanies this book. Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.

A ABC transporter(s), 20F, 660, 663–667 antigen presentation, 1582 ATP binding, 665 auxiliary transport, 666F bacterial vs. eucaryotic, 665F molecular design, 660F multidrug resistance protein, 665–666 Ablgene, Abl gene, in chronic myelogenous leukemia, 1261, 1261F Abortive transcription initiation, 337F Absorptive (brush-border) cells, 1437, 1437F, 1438F Acanthamoeba castellanii, myosin, 1013 Accessory receptor, T cells, 1580 Ac-Ds elements, 318T Acetylation, histones, 223F, 290 Acetylcholine (ACh) blood vessels nitric oxide, 888 concentration in synaptic cleft, 882 different effects on different cells, 885, 885F neurotransmitter function, 684, 808 receptors see Acetylcholine receptors (AChRs) structure, 885F Acetylcholine receptors (AChRs), 1394 conformational changes, 685F history, 684 mode of action, 685 muscarinic, 916 neuromuscular junction, 684–686, 687F basal lamina and, 1168 sequential activation, 687–688 nicotinic, 916 resting potential, 685 selectivity, 685 structural model, 686F structure, 685 as transmitter-gated channels, 684–686 Acetyl CoA (Acetyl Coenzyme A), 84T, 96–97 energy storage, 96 fatty acid oxidation, 97F mitochondrial production, 96, 97F 97F,, 817 see also Citric acid cycle structure, 83F N-Acetylneuraminic -Acetylneuraminic acid, 628F 628F,, 774F, 775F Achaete gene, 1356 Acid(s), 52–53, 109F measurement see pH secretion, stomach, 1436 in water, 53F Acid anhydrides, 107F Acid hydrolase receptors, retromers, 755 Acid hydrolases, lysosomes, 779–780 Aconitase, 122F Acquired immunodeficiency syndrome (AIDS), 1581 see also HIV Acquired immunological tolerance, 1547 see also Immunological tolerance Acrosomal vesicle, 1293 Acrosome reaction, 1297, 1298, 1299F ACTH (adrenocorticotrophic hormone), 803F 803F,, 907T Actin/actin filaments, 611F, 965F accessory Actin-binding protein(s) anchoringproteins junctionsee attachment, 1133T, 1134, 1135T adherens junctions and cell motility, 1142 integrin attachment, 1170, 1170F via catenins, 1142, 1142F arrays, 1006 assembly see Actin polymerization axon structure, 1048

bacterial homolog, 990, 990F capping, 1003, 1003F cell cortex, 1036F, 1037 contractile ring (cytokinesis), 966, 1093–1094 RhoA and, 1095, 1095F depolymerization, 1001 cofilin see Cofilin (actin depolymerizing factor) D-form (ADP-bound), 980 drugs affecting, 987, 988T dynamic behavior, 966, 1037 elongation, modification by proteins, 999–1000 ERM protein regulation, 1009 evolutionary conservation, 982–983 growth rate of plus/minus ends, 976 induction/assembly, pathogen-induced, 1515–1516, 1515F nucleation mechanism, 1516F see also Actin polymerization isoforms, 982–983 minus end, tropomodulin, 1003 muscle contraction, 1026–1028 neuronal growth cones, 1387F nucleation see Actin polymerization nucleotide-binding site, 974, 974F organization, Rac, Rho and Cdc42 effects, 1042–1043, 1042F, 1043F plant cell wall deposition, 1202 plus end capping protein, 1003 myosin movement, 1013 polymerization see Actin polymerization properties, 965 Saccharomyces cerevisiae, 969–970 structure, 145F, 968, 968F, 975 subunits, 971 T-form (ATP-bound), (ATP-bound), 980 treadmilling, 976–980, 977F, 977FF, 979, 979F yeast actin patches, 969, 970F Actin-based motor proteins, 1011–1014 see also Myosin Actin-binding protein(s), 983F, 994F, 1006–1008 cross-linking, 1006–1007, 1007F bundling, 1006–1007, 1007F web/gel-forming, 1006, 1008–1009, 1009F filament dynamics and, 1002–1003, 1002F filament elongation and, 999–1000, 999F, 1000F severing proteins, 1000 Actin cables, in yeast, 969–970, 970F Actin depolymerization factor see Cofilin (actin depolymerizing factor) a-Actinin, actin filament packing, 994F, 1007, 1007F Actin-linked cell–matrix adhesion, 1133T, 1134, 1135T Actinomycin, 385T Actin polymerization bacterial intracellular movement, 1515–1516, 1515F, 1516F bacterial invasion process, 1508, 1509F nucleation, 973F ARP complex role, 997F lamellipodia, 996 pathogen-induced mechanism, 1516, 1516F 996–998 at plasma membrane, protrusion model of cell movement, 1037–1038, 1039F regulation, 996–998 nucleotide hydrolysis, 974, 976 plasma membrane protrusion, 1037–1038, 1039F pushing force, 1039 rate, 973, 973F

subunits, 971 time course, 978F Actin-related protein (ARP), 994F, 997, 1022 Actin-rich cortex, 1036F, 1037 Action potential(s), 679FF definition, 676 initiation, 689 postsynaptic potential, 689F propagation, 677, 677F saltatory conduction, 680 recording, 679F schematic, 676F squid giant axon experiments, 678, 679, 679F voltage clamping, 679, 679F Activated carriers in metabolism, 79–86, 84T formation, 78–79 glycolysis, 92F see also Glycolysis reaction coupling, 79–8082–83, 824–825 see also speci specific fic carriers carriers Activation energy, 72, 73F lowering by enz ymes, 73F, 160, 160F lysozyme, 165–166 Activation-induced deaminase (AID), 1567F 1567F,, 1568 Active site, 72–73, 74F lysozyme, 164F, 165F, 166 role in catalysis, 166 see also Enzyme catalysis serine proteases, 154, 155F spliceosomes, 352 Active transport, 653–667, 654F, 822, 823F antibiotic resistance and, 1522, 1523F antiporters see Antiporters ion gradient driven, 656–657 primary vs. secondary, 656 symporters, 656, 656F, 659 uniporters, 656, 656F see also Carrier protein(s) Activity-dependent synapse elimination, 1394 Adaptation bacterial chemotaxis, 944 calcium ion activated potassium ion channel, 690 photoreceptors, 917–918 receptor down-regulation, 903, 903F receptor inactivation, 903F, 920 receptor sequestration, 903F, 920 visual transduction, 919 Adaptin, clathrin-coated vesicles, 756F Adaptive immune response see Immune response/system, adaptive Adaptor proteins, signaling pathways, 899, 927 ADARs see Adenosine deaminase(s) (ADARs) Adenine, 116F, 197, 301F base-pairing, 198F deamination, 301F RNA structure, 332 Adenocarcinoma, definition, 1206 Adenoma, definition, 1206 Adenomatous polyposis coli see APC (adenomatous polyposis coli) gene/protein Adenosine deaminase(s) (ADARs), 484, 484F reaction diphosphate rates, 161F see ADP Adenosine Adenosine triphosphate see ATP Adenovirus(es), 1496F entry and uncoating, 1506F, 1507 microtubule-based movement in axons, 1517 Adherens junction(s), 1135T adhesion belt (zona adherens), 1142, 1143F cadherins see Cadherin(s)



catenin interactions, 1142 columnar epithelium, 1134, 1134F coordination of cell motility, 1142 occurrence, 1142 see also Cell adhesion Adhesins bacterial adhesion to epithelium, 1502 phagocytosis induction by bacteria, 1508, 1509F Adhesion belt (zona adherens), 1142, 1143F Adhesion receptors, lymphocyte recirculation, 1550–1551 Adipocytes see Fat cells Adjuvant(s), 1539 ADP (adenosine diphosphate)

see also Cooperativity (protein interactions) integrins, 1171 linkage, 171–172, 172F see also Feedback regulation Alport syndrome, 1167 Alternative splicing, 348 advantages, 348, 479 Dscam gene, 479F gene definition modification, 480–481 internal splice site, 479F intron sequence ambiguity, 480 mutually exclusive exons, 479F neural cell adhesion molecule (NCAM), 1146–1147

Amyloplasts, 841, 841F Amyotrophic lateral sclerosis (ALS), neurofilament assembly, 987 Anabaena, 15F Anabolism see Biosynthesis Anaerobic organisms, 839, 839F evolutionary significance, 12, 870–872 formic acid oxidation, 871, 871F glycolysis, 839 see also Glycolysis pathogenic, 1501 Anaphase meiosis anaphase I, 1091, 1091F

ATP:ADP ratio, 823–824 D-form Actin, 980 production from ATP, 80, 80F Adrenaline (epinephrine), 907T glycogen breakdown, 900 G-protein-linked receptors, 904 smooth muscle control, 1030 Adrenocorticotrophic hormone (ACTH), 803F, 907T Aequoria victoria, 592 Aequorin, intracellular ion concentration, 596–597, 597F Aerobic metabolism, 97–98 bacterial, 839, 839F evolution, 12, 27, 873–874 Aeropyrum pernix, genome size, 18T Affinity, antibody for antigenic determinant, 1558 Affinity chromatography, 512, 514F DNA-binding proteins, 428–429, 429F matrices, 534F principles, 428–429 protein–protein interactions, 523 protein separation/purification, 428–429, 429F 429F,, 513–514, 515F see also Protein tags protein tagging, 515F Affinity constant (K (Ka), 158F antigen–antibody binding, 1558 Affinity maturation, antibody production, 1562, 1566, 1566 Aflatoxin B1, 1225, 1226F 1226F,, 1229 African sleeping sickness, 354 Agamous Arabidopsis mutant, 1413, 1413F Agamous gene, 1414F Agarose gel electrophoresis, 534 Age/aging premature, DNA repair defects, 295T relation to telomere shortening, 293–294 see also Cancer Aggrecan, 1181, 1182, 1182F 1182F,, 1184T Agrin, NMJ, 1168 AIDS (acquired immunodeficiency syndrome), 1477, 1581 see also HIV AIDS virus see HIV Airways, histology, 1434–1436

optional exon, 479F optional intron, 479F patterns, 479–480, 479F post-transcriptional gene regulation, 479–480, 479F regulation, 480, 480F splicing signals, 349, 349F a-tropomyosin gene, 349F, 480 Alu elements, 322, 323F Alveolar cells, types I/II, 1434 Alveoli lung, 1434, 1435F mammary gland, 1427–1428, 1427F Alzheimer’s disease, protein aggregates, 397, 1001, 1021 a-Amanitin, 385T Ames test, 1225, 1225F Amide bond, hydrolysis, 161F Amine groups, 107F Amino acid(s), 5, 59–60, 125 aminoacylation, 370, 371F see alsoTransfer alsoTransfer RNA analysis, mutation rate data, 264 charge (pK values), 60F coding for, 199–200, 200F see also Genetic code energy sources, 99, 101 see also Citric acid cycle essential, 101, 101F families, 128 acidic, 128, 128F, 129F basic, 128, 128F nonpolar, 127F, 129F polar (uncharged), 127F, 129F nitrogen cycle, 100–101 optical isomers, 128F protein folding role, 130, 130F protein functional role, 152 side-chain effects, 154–155, 154F protein structure role, 125–137 protein subunits, 59, 126F structure, 59–60, 59F, 128F side chains, 60F, 125–127 see also Protein(s); individual amino acids Aminoacyl-tRNA–ribosome binding, 375, 375F

anaphase II, 1091F mitosis, 1054, 1073F, 1089F anaphase A, 1089–1090 anaphase B, 1089–1090 spindle assembly checkpoint and, 1088 Anaphase promoting complex (APC/C), 1064, 1066T chromatid separation and completion of mitosis, 1066, 1087, 1087F, 1088F G1 phase and, 1100–1101, 1100F regulated proteolysis, 395, 396F regulation, 1064, 1066T, 1087, 1100–1101 targets/mechanism of action, 1065F 1065F,, 1071, 1100 DNA replication initiation and, 1068 geminin destruction, 1068–1069 M-cyclins, 1064 S-cyclins, 1064 securin destruction, 1064 Ancestor tracing, 247, 248F Anchorage dependence, 1175–1176, 1175F Anchor amino acid, peptide binding to MHC protein, 1578–1579, 1579F Anchoring junction(s), 1132, 1132F 1132F,, 1133–1150, 1133T, 1135T see also Cadherin(s); Integrin(s); specific types Anchor proteins, cytoskeletal, 1142 Anemia, 452, 646 Aneuploidy meiotic nondisjunction, 1278–1279 polyspermy, 1300 Angiogenesis, 1446, 1448–1449 capillary sprouting, 1447, 1447F endothelial cells role, 1446, 1447F inhibitors, in cancer ther apy, 1262 process, 1446–1447, 1449F response to wounding and damage, 1448, 1448F tumor growth and, 1220–1221, 1448 Anion, definition, 47 Anisomycin, 385T Antenna complex, 848, 848F Anteroposterior axis development Drosophila,1331–1334, 1331F, 1332F, 1334F role of homeotic selector genes, 1341–1347, 1342F, 1343F vertebrates amphibian embryo, 1366

Aktin(protein cancer, kinase 1244 B), 934 Alanine, structure, 129F Albinism (hypopigmentation), 786 Albumin, gene characterization, 539–540 Alcohol dehydrogenase, structure, 144F Alcohol, production by fermentation, 90, 90F Aldehydes, oxidation in glycolysis, 92F Aldolase, 120F Aldoses, 112F Alexa dyes, 587, 587F Algae, 32 evolution, 874, 875F Allele(s), 314, 554F, 558 frequency, haplotype blocks, 562F of MHC proteins, 1576 natural selection effects, 561–562, 562F Allelic exclusion, 1565 Allergy/allergic reactions, 1556, 1557, 1557F Allograft(s), 1575 All-or-none response, 900 Allosteric cooperative transitions see Allosteric regulation

Aminoacyl-tRNA synthetases, accuracy, 371–372, 377–378370, catalytic reaction, 371, 371F proofreading, 370, 372, 372F structure, 371–372, 373F synthetic ribozymes, 407 see alsoTransfer alsoTransfer RNA Amniotic sac, 1379 Amoebae, 33F cell crawling, 1036 osmosis regulation, 663 spread of Legionnaire’s disease, 1508 AMP (adenosine monophosphate) cyclic see Cyclic AMP production from ATP, 86, 86F AMPA receptor(s), hippocampus, 691 Amphibians embryos gastrulation, 1364–1369 polarity, 1364 see also Xenop Xenopus us laevis development genome size, 30–31 lampbrush chromosomes, 234F, 235F

role of homeotic selector genes, , 1346F, 1347F Anthrax, 1493, 1493F Antibiotics, 1521–1522 misuse, 1524 resistance, 1521–1524 active pumping, 1522, 1523F environmental reservoirs, 1523–1524 enzyme alteration, 1522, 1523F horizontal gene transfer, 22 mobile genetic elements, 318F R-gene product, 1522, 1523F selective pressure, 1523 transfer, 1522–1523 targets/mechanisms of action, 1494F 1494F,, 1522F protein synthesis inhibitors, 384, 384F 384F,, 385T Antibodies see Immunoglobulin(s) Anticodon(s), 6, 7F, 368–369, 368F, 369F, 377 wobble, 369, 369F Antigen(s), 156, 1539, 1557 monoclonal specificity, 508–509 Antigen–antibody binding, 156–157, 1553F 1553F,, 1558F affinity constant (K (Ka), 1558

Allosteric 171, 172–173 171–176 Allosteric proteins, regulation, conformational changes, 171, 172F phosphorylation-mediated, 175 proton pumps, 835–836, 837F ribozymes, 404 cooperative transitions, 173–174, 173F, 174F, 174F, 175F

see also Xenopu Xenopus; s; indiv individual idual species species Amphipathic molecules evolutionary significance, 404–406 phospholipids, 58–59 Amphiphilic molecules, 618 Ampicillin resistance, mobile genetic elements, 318F Amyloid protein, aggregation, 396–397

determinant number, 1553F Antigen-binding si te, 1552, 1552F, 1554F, 1559F, 1559F, 1561F structure, 156, 157F 157F,, 1560–1561 Antigenic determinants (epitopes), 1545, 1558F Antigenic variation, 1519–1520, 1519F Antigen presentation, 1590–1591 B7 proteins, 1590




CD28, 1590 cross presentation, 1584 cytotoxic vs. helper T-cells, 1584–1585 Antigen-presenting cells, 1540, 1542, 1542F 1542F,, 1571–1572, 1571F costimulatory molecules, 1572F see also Macrophage(s) Antimicrobial drugs, resistance see Antibiotics, resistance Anti-Müllerian hormone, 1285, 1286F Antiporters, 656 mechanism, 656F sodium-calcium exchanger, 660 sodium-driven chloride–hydrogen carbonate exchanger, 657–658 sodium independent chloride–hydrogen carbonate exchanger, 657–658 sodium–potassium pump (ATP (ATPase), ase), 661–663, 839–840 sodium–proton exchanger, 657 see also speci specific fic types Antirrhinum (snapdragon), mutation transforming flower to leafy shoot, 32 Antisense RNA, dominant negative mutations, 564, 564F Antiserum, 589 Antral follicles, 1292 AP2/EREBP gene regulatory proteins, 1400T Apaf1, apoptosis, 1121, 1122F APC/C see Anaphase promoting complex (APC/C) APC (adenomatous polyposis coli) gene/protein, 949, 950, 1252 colorectal cancer, 1252T, 1253 Ape(s), evolutionary relationships, 247, 247F, 248F AP endonuclease, base excision repair (BER), 298, 299F Apetala2 Arabidopsis mutant, 1413, 1413F Apetala2/ethylene-responsive-element binding protein, 1400T Apetala2 gene, 1414F Apetala3 Arabidopsis mutant, 1413, 1413F Apetala3 gene, 1414F Apical meristem, 1403, 1408F, 1409–1410, 1410F maintenance by Wuschel and Clavata signaling, 1409–1410, 1410F root, 1163, 1407F shoot, 1163, 1401F 1401F,, 1408FF, 1409–1410, 1411F Aplysia, cell movement, 1040 APOBEC, 1535 Apoptosis (programmed cell death), 1115–1129, 1116F activation/induction abnormal mitogenic stimulation, 1107–1108, 1108F Apaf-1, 1121, 1122F DNA damage, 1106 Fas ligand/Fas receptor, 1120, 1571, 1573F 1573F,, 1594 procaspases, 1118, 1119F 1119F,, 1120F, 1121 1127 associated cancer and,diseases, 1127, 1215–1216, 1216F, 1245–1246 cell elimination, 1115–1117 cell recognition, biochemical, 1117–1118 cell signaling, 884, 885F cellular changes, 1115 plasma membrane, 1117 development, 1126 C. elegans, 1327 mouse paws, 1116, 1116F tadpole metamorphosis, 1116, 1117F DNA damage, 1117, 1118F extrinsic pathway, 1120–1121 hemopoiesis, 1462 intrinsic pathway, 1121, 1124F, 1125F IRES-mediated production of cell-death proteins, 491 macrophage scavenging, 787 in mammary gland, 1428 membrane potential, 1118 mitochondrial proteins, 856 neurons, 1389–1390 phagocytosis, 787, 1115

phosphatidylserine, 627 proteolytic cascade, caspases see Caspase(s) regulation anti-apoptotic proteins, 1122–1123 Bcl2 proteins, 1121–1124 IAP proteins, 1124–1125 pro-apoptotic proteins, 1122–1123 Appendages, development, 1347–1363


fine-grained patterning, 1356–1358, 1362 insects, 1347–1355, 1356–1362 vertebrates, 1355–1356 see also specif specific ic appendages Apterous gene, 1352, 1353 Apurinic sites, 299F Apyrimidinic sites, 299F Aquaporin channel(s), 673–675, 673F mode of action, 674, 675 structure, 633F, 674, 674F Aquifex genome size, 18T in tree of life, 16F Arabidopsis thaliana (wall cress), 36f, 39F, 1398FF embryogenesis, 1400, 1402, 1402F flowers, 1412F homeotic mutations, 1413F gene regulatory proteins in, 1400T genetic screen, 1399F, 1402 genome, 142, 147, 569, 1399–1400 size, 18T homeotic selector gene expression in flower, 1414F model plant, 36, 37–39, 568–569, 1398–1399 mutant seedlings, 1402F transgenic, 569 Archaea (archaebacteria), 16, 16F 16F,, 17, 18T bacteriorhodopsin, 640–642 membrane composition, 624 Archaeoglobus fulgidus, genome size, 18T Architectural protein(s), 445–446, 447F see also DNA bending ARF protein(s), 759, 1107 Arginine, structure, 128F Argonaute protein, 494, 494F 494F,, 496 ARP (actin-related protein), 994F, 997, 1022 ARP complex (ARP 2/3 complex), 997, 997F in lamellipodia, 1038, 1038F pathogen movement, 1516 Arrestin, 919, 920–921, 920F ARS (autonomously replicating sequence), 286, 287F Artery, 1445F Arthritis, chronic infections, 1500 Arthropods ECM polysaccharides, 1180 infections transmitted by, 1501–1502 see also indiv individual idual species species Artificial chromosomes, DNA cloning vectors, 541, 542F Ascaris, 1487, 1489F Ascaris lumbricoides, 1489 Asexual reproduction, 1269, 1269F Ash1 gene regulatory protein, 1023, 1023F A-site (ribosome binding), 375F 375F,, 376 Asparagine-linked oligosaccharide(s), protein glycosylation, 737, 737F, 747F Asparagine, structure, 129F Aspartate (aspartic acid), structure, 129F

Atoms, 45–48, 46, 47F, 48F atomic interactions, 46–48 atomic radius, 51 atomic structure, 45–46, 46F electrons see Electron(s) space-filling models, 51 valences, 47 ATP (adenosine triphosphate), 8–9 abundance, 81 biosynthetic role, 81, 81F chemical structure, 61F, 117F energy carrier, 61, 62F 62F,, 78, 80–81 historical aspects, 90 hydrolysis see ATP hydrolysis radiolabeling, 603F synthesis see ATP synthesis transport, 822 utilization measurement, 168 ATP:ADP ratio, 823–824 ATPases ATP ases (ion transport), 659–660, 665 see also specific pumps/proteins ATP caps, actin filaments, 979, 979F ATP hydrolysis, 80F alternative route, 86F aminoacyl-tRNA synthetases, 371 ATP synthase, 826, 826F carbon fixation, 845, 845F chromosome condensation, 243 coupled to DNA replication, 273, 273F coupling to biosynthetic reac tions, 81, 81F, 824–825 nucleic acids, 86, 87F energetics, 81, 86, 86F, 824–825, 825F glutamine synthase, 81F mitochondrial protein import, 716–717 nucleosome sliding, 215–216 sperm motility, 1293 spliceosomes, 351–352 ATP-mediated ATP -mediated phosphorylation, 84F ATP synthase, 660, 813, 814F bacterial, 839 chloroplast localization, 855F mechanism of action, 822–823 mitochondrial localization, 821, 855F oxidative phosphorylation, 821–822, 821F reversibility, 826–827, 826F bacteria, 839 energetics, 826–827 sodium-driven, 839–840 structure, 822F see also ATP hydrolysis; ATP synthesis ATP synthesis, 80 electron transport-driven, 100F 100F,, 817–819, 819F proton gradients, 821–823, 821F uncoupling, 836 see also Electrochemical proton gradients; Electron transport chain(s) energetics, 80 evolution, 870–876

Aspartate transcarbamoylase allosteric cooperative transitions, 173–174, 174F catalytic mechanism, 173–174, 175F structure, 144F, 173, 174F Aspartic acid, structure, 129F Association constant (K (Ka), 158F Association rate, 158F, 526 Associative learning, 1396–1397 Asthma, 1500, 1534F Astral microtubules, 1035F, 1076, 1076F Astral relaxation model, 1096–1097, 1096F Astral stimulation model, 1096, 1096F Asymmetrical division, oocytes, 1289, 1289F Asymmetric cell division, 1099, 1099F oocytes, 1289–1290, 1289F stem cells, 1421, 1421F AT–AC AT –AC spliceosome, 353–354, 354F Ataxia telangiectasia (AT), 295T, 304 mutation, 295T, 304, 1106 Atherosclerosis, 791, 1500 Atherosclerotic plaques, 791, 1500 ATM protein kinase defects, 295T, 304

anaerobes, 871–872 872–875 cyanobacteria, fermentation, 870–871 glycolytic pathway, 91, 92F, 93F, 121F see also Glycolysis mitochondrial see Oxidative phosphorylation photosynthetic, 94–95, 95F, 850–853 cyclic photophosphorylation, 853 noncyclic photophosphorylation, 850–853, 852FF see also ATP synthase; Glycolysis ATR protein kinase, DNA damage and, 1105 Attenuation, bacterial gene regulation, 477–478 Atypical protein kinase C (aPKC), epithelial apicobasal polarity, 1156 Auditory hair cells, 1429, 1430–1432 , 1431F, 1431FF Aurora B kinase, 1084 Aurora kinases, 1074 Autimmune regulator (AIRE) protein, immunological tolerance, 1588 Autocatalysis, origin of life, 7F, 401 Autocrine signaling, 881

DNA damage and, 1105 mutation, 1106 Atoh1 gene, 1432 Atomic force microscopy (AFM), 600, 601F Atomic modeling, proteins, 527–531 Atomic nuclei, NMR, 529 Atomic radius, 51 Atomic weight, definition, 45

Autoimmune disease, 1539, 1549 Automated DNA sequencing, 550, 550F Autonomously replicating sequence (ARS), 286, 287F Autophagosome(s), 782–783, 784F Autophagy, 782–783, 783F, 784F apoptosis, 1126 Autophosphorylation, 915, 915F, 922

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



Autoradiography, 601, 602–603, 603F electron microscopy, 603F eucaryotic replication forks, 282–283, 284F 2D-PAGE, 522F 3H-thymidine, 282–283, 284F 3H-uridine, 603 Autosome(s), 473, 554F, 1271 Auxin, 959, 1403–1404, 1408–1409 indole-3-acetic acid, 959F, 1406F transport in plants, 959–961 Avogadro’s number, 45–46 Axil, 1410 Axillary bud, 1410, 1411F Axin, 949 Axon(s), 680F, 1047 action potential propagation, 677F see also Action potential(s) cytoskeleton, 1047–1050 see also Axonal transport development, 1386–1387, 1387F differentiation from dendrites, 1386 guidance mechanisms, 1140, 1147, 1177, 1387–1389, 1388F retinotectal projection, 1391–1393 microtubule orientation, 1047 myelin sheath, 678, 680F neurosignaling, 675 see also Dendrite(s) Axonal transport anterograde vs. retrograde, 1048 herpes viruses, 1516–1517, 1516F Axonemal dyneins, 1015, 1033, 1033F Axoneme, sperm, 1293, 1293F Axon hillock(s), ion channels, 689 Azide, cytochrome oxidase binding, 834

B B1 elements, 323F B7 proteins, 1592T, 1594, 1595F antigen presentation, 1590 CTLA4 binding, 1591–1592 T-cell activation, 1591F Bacilli, 1490F Bacillus, 16F, 18T Bacillus anthracis, 1493 Bacillus subtilis, 18T, 20F BACs (bacterial artificial chromosomes), DNA cloning vectors, 541, 552 Bacteria, 16, 16F 16F,, 1488, 1489–1490 antibiotic action and targets, 1494F archaea and eucaryotes vs., 16, 17F bacteriophage adhesion, 1505 chemical composition, 55T, 63T chemiosmotic coupling, 839–840, 839F chromosomes, 202, 1491F origin of replication, 282, 283F diversity, 15 DNA 280, 282, 283F seereplication, also DNA replication DNA sequences as immunostimulants, 1527 E. colias coli as model, 24–25, 25F electron transport, 873F evolution, 871–872 see also Electron transport chain(s) energy sources, 839 entry into host cells by phagocytosis, 1507–1508

epigenetics, 472 gene expression, 345F see alsoTranscription alsoTranscription gene regulation see Bacterial gene expression regulation genomes sequenced, 18T size, 17, 18T, 1488 Gram-negative, 1490F, 1527 Gram-positive, 1490F, 1527 intracellular movement, 1514–1517 invasion of host cells, 1507–1508, 1509F lithotrophic, at hydrothermal vents, 12 mRNA, 346F, 380, 381F normal flora, 1486, 1501 pathogenic, 1489–1494 facultative pathogens, 1490 genome organization, 1492F invasion, 1507–1511 nonpathogens vs., 1492F obligate pathogens, 1490–1491

opportunistic pathogens, 1490 phase variation, DNA rearrangement, 454–455 photosynthetic, 840, 863, 872–875 see also Cyanobacteria; Photosynthesis; Purple bacteria porin insertion, 717, 717F protein synthesis, 345F, 380 inhibitors, 384, 385T see also Antibiotics ribosomes, 612F see also Protein synthesis; Translation riboswitches, 478–479 structure(s), 1490F capsules, 1532 cell-surface projections, 1490F cell wall, 14, 1490F, 1527 flagella see Flagella outer membrane, 1490F pili (fimbriae), 1490F plasma membrane, 839–840, 1490F ribosomes, 612F shapes, 14F, 1490F sizes, 14F, 17 toxins see Bacterial toxins transcription see underTranscription Transcription translation quality control, 387, 387F virulence genes and factors, 1491 viruses of see Bacteriophage(s) see also specif specific ic organisms Bacterial artificial chromosomes (BACs), 541, 552 Bacterial gene expression regulation, 336–338, 339F, 345F gene regulatory proteins, 416 DNA sequence recognition, 418T repressors, 416 see also Genetic switches; Repressor protein(s) operons, 433F, 462–463 see also also Lac Lacoperon operon (Escherichia coli) transcription attenuation, 477–478 see alsoTranscription alsoTranscription Bacterial toxins, 1492 Bacillus anthracis, 1493 cholera, 1492, 1504–1505 diarrhea due to, 1491 edema toxin (anthrax), 1493 lethal toxin (anthrax), 1493 mechanism of action, 1493–1494 cAMP overproduction due to, 1503 type III secretion system for, 1493, 1494F, 1494F, 1504 type IV secretion system for, 1493–1494 Bacteriophage(s), 21, 22F, 1492, 1492F bacterial adhesion, 1505 genome integration, 324, 325F see alsoTransposition alsoTransposition virulence gene transfer, 1491–1492 see also individual viruses Bacteriophage lambda bacterial adhesion, 1505 conservative site-specific recombination, 324,

distribution/occurrence, 1164–1165, 1164F epidermal stem-cell maintenance, 1421, 1426 functional roles, 1164 barrier functions, 1168 diversity, 1167–1169 kidney glomerulus, 1164–1165, 1164F, 1167 mechanical, 1165 regeneration and, 1168–1169, 1168F mammary gland, 1428 structure/composition, 1165, 1165F 1165F,, 1166F, 1167F laminins, 1165–1166 type IV collagen, 1165, 1166–1167 synthesis, 1165 Base(s) (chemical), 53, 109F measurement see PH Base(s) (nucleic acid) DNA, 197–199, 198F, 198FF damage, 296, 296F natural, 301F tautomers, 268–269, 270F unnatural, 301F nucleotide structure, 61, 116F pairing see Base-pairing purine see Purine base(s) pyrimidine, 61, 116F RNA, 300 Base excision repair (BER), 297–298, 299F Base-flipping, 298, 300F 300F,, 306, 306F Basement membrane see Basal lamina Base-pairing (nucleotides) DNA structure and, 197–199, 198F, 198F, 198FF see also DNA structure DNA synthesis and, 266, 266F, 268–269 see also DNA replication; DNA synthesis origin of life, 401 RNA and, 332, 333F, 334F splicing mechanism, 351 see also Ribosomal RNA; RNA structure unusual, 269, 332 RNA folding, 333F wobble base-pairing, 369F Base substitution mutation(s), 246 Basic helix-loop-helix (bHLH) proteins, 1356, 1362, 1400T Basophils, 1452F, 1556, 1557F Bax, apoptosis, 1122 B cell(s), 1540 activation, 1543–1544, 1543F, 1552, 1554F, 1568, 1568F, 1596F antibody gene-pool selection, 1565–1566, 1566F B-cell receptor, 1595, 1596F class switching, 482–483 helper T-cells (TH), 1574–1575, 1597–1598, 1597F antibody synthesis, 1552 post-transcriptional control, 482–483 B1 cells, 1599

325F326 excisionase, integrase, 294, 324, 325F gene regulation, 457–458, 458F corepression, 457, 458F Cro repressor, 421F, 457–458, 458F dimerization, 142, 142F sequence recognition, 421F lambda repressor, 416, 418T, 457, 458F see also Cro repressor; Lambda repressor life cycle, 325F excision, 324 heritable state, 458, 458F integration, 324, 325F lytic state, 458, 458F prophage, 457, 458F transcription circuits, 459 Bacteriophage T4, 22F Bacteriorhodopsin, 640–642, 640F, 641F Bacteroides, 1501 BAD protein, PI 3-kinase signaling, 934, 934F Bak, apoptosis, 1122 Balbiani rings, mRNA export, 359, 359F Ball-and-chain model, voltage-gated potassium ion channels inactivation, 678F Barr body, X-inactivation, 473 Basal cell carcinoma, 951 Basal cells epidermis, 1419, 1419F olfactory epithelia, 1429F, 1430 Basal lamina, 1131, 1132F, 1164–1169 , 1419F

B2 cells, 1599 1416F, B-cell receptor, 1416F, 1595–1596, 1596F T-cell receptor vs., 1595–1596 co-receptors, 1594–1595, 1596F development, 1543–1544, 1543F, 1552, 1553–1554, 1554F antibody gene-pool selection, 1565–1566, 1566F class switching, 482–483, 1568F see also Immunoglobulin(s) hybridoma production, 508–509, 509F immunological synapse, 1597T memory, 1546 monospecificity, 1565–1566 recirculation, lymph node lymphoid follicles, 1550 regulation, Fc receptor signaling, 1596 resting, 1544F signaling events, 1416F 1416F,, 1596F Bcl2 proteins, 1121–1124, 1123F in cancer, 1127, 1245 Bcl-XL protein, membrane integrity, 1122–1123 Bcr–Abl protein, 1261 Gleevec and, 1262F Bcrgene, Bcr gene, chronic myelogenous leukemia, 1261, 1261F “Beads on a string” chromatin, 211, 211F, 211F, 212F BEAF insulator-binding protein, 453F Beggiatoa, 15F Behavioral mutants, 556, 557F Benzopyrene, role in cancer, 1225


Beta-barrel proteins, as transmembrane proteins, 632, 635F see also speci specific fic proteins proteins Beta-cells (insulin-secreting), 1444, 1444F Betaglycan, 1184, 1184T Beta-sheet motif, 131, 134F, 135, 135F DNA-binding, 422, 423F see also Protein structure BH3-only proteins, apoptosis, 1123–1124 BH123 proteins, apoptosis, 1122, 1123F Bicoid protein, 1333, 1333F 1333F,, 1334, 1334F Drosophila development, 1022–1023 eve gene activator, 448–449, 449F mRNA localization, 486–487, 1022–1023 Bid, apoptosis, 1124 Bidirectional signaling, Eph receptors and ephrins, 922 Binocularly driven cells, in visual cortex, 1395–1396 Biological order, 65–87 structural, 64F, 65F thermodynamics, 66–68 entropy, 67, 67F see alsoThermodynamics alsoThermodynamics Bioluminescence, 596–597 Biosynthesis, 66 activated carriers, 79F, 81, 81F see also speci specific fic carriers carriers biological order, 65–87 catabolism vs., 67F cholesterol, 83F feedback inhibition, 170, 170F macromolecules, 63 energy requirements, 84–87 see also specific pathways Biosynthetic–secretory pathway(s), 749–787, 750F, 800

pH control, 770, 770F see also Exocytosis; Protein transport Biotin, 84F, 167, 167T BiP, 736, 736, 767 Birthdays, neuronal, 1385–1386, 1386F 1, 3-Bisphosphoglycerate, 121F Bithorax complex, 1342, 1342F Bivalent formation, 1274, 1274F 1274F,, 1276F Black membranes, 622, 622F Bladder cancer, 1210F, 1228, 1229 infections, uropathogenic E. coli, 1502, 1503F Blastocyst, 1379–1380, 1379FF, 1381F Blastoderm, 1330–1331, 1330F Blastomere, 1365, 1365F 1365F,, 1379F Blastopore, 1366, 1367–1368, 1367F BLAST sequence alignment, protein analysis, 531, 531F Blastula, 1363F, 1365 Blie, 1443 Blood cells, 1451–1453, 1451F, 1452–1453, 1452F, 1453T formation see Hemopoiesis functions, 1453T types see also individual Blood coagulation anti-clotting agents, disintegrins, 1193 ECM degradation, 1194 Blood sinuses, in bone marrow, 1454 Blood vessels, 1445–1450, 1445F, 1446F branching mechanism, 1448 development, 1446 endothelial cells see Endothelial cells formation and sprouting see Angiogenesis see also speci specific fic types Bloom syndrome, DNA repair disorders, 295T Blotting membranes, 538 Northern blotting, 538–539, 539F Southern blotting, 539–540, 539F western blotting, 519F see also DNA hybridization B lymphocyte leukemia, origin, 1219 B lymphocytes see B cell(s) BMP (bone morphogenetic protein) family, 1336, 1441 Bone(s), 1469–1474 canaliculi, 1470, 1470F cartilage replacement by, 1470–1471, 1471F cells, 1467, 1470F see also Osteoblast(s); Osteoclast(s) composition, 1469–1470 development, 1470–1472 cartilage model, 1470–1471, 1471F


ECM production, 1179 fibroblasts transformation to, 1468, 1469–1471 formation, endochondral, 1470 joints, 1471–1472 lacunae, 1470 long, development, 1470–1471, 1471F matrix erosion by osteoclasts, 1471 secretion by osteoblasts, 1469–1470 as source of signal proteins, 1471 uncalcified (osteoid), 1469–1470, 1470F remodeling, 1472–1473, 1473F ECM degradation, 1193 stress response, 1474 repair, 1474 structure, 1470F Bone marrow apoptosis, 1117 blood cell production, 1453–1456, 1453F, 1541F control, 1459 see also Hemopoiesis blood sinuses, 1454 histology, 1453–1462, 1455F stromal cells, role, 1458–1459 transfusion, 1456, 1456F transplantation, 1456, 1456F X-ray effect on, 1455–1456, 1456F Bone morphogenetic proteins (BMPs), 1336, 1441 Bordetella pertussis, 1503, 1504 Borrelia burgdorferi, chronic illness, 1500 Boundary elements see Insulator elements Bovine spongiform encephalopathy (BSE), 397–398, 1498 see also Prion proteins (PrP) Brachyury (“short tail”) protein, 1370 Brain, sensory maps, 1391–1395, 1392FF Branchial arches, 1345 Branching morphogenesis, 1381–1382, 1382F Branchless gene, 1382 Branch migration, 307F 307F,, 308, 308F, 312F Branch point-binding protein (BBP), 350F Brassinosteroids, 957, 1403 Brat protein, 1361 Brca1/Brac2 proteins, 310 BrdU (bromodeoxyuridine) cell cycle analysis, 285, 285F, 1059, 1059F epidermal cell division, 1422 muscle cell division, 1425 Breast cancer Brca1/Brac2 proteins, 310 chromosome abnormalities, 1215F DNA repair defects, 295T incidence dependent on reproductive history, 1229, 1229F typical growth, 1208F Breathless gene, 1382 BRI1 receptor kinase, 957 Bride-of-sevenless mutant, Drosophila Drosophila,, 927 Brightfield microscopy, 583


Bromodeoxyuridine Bronchiole, 1435F see BrdU (bromodeoxyuridine) Brown fat, 838 Brown, Louise, 1301 46BR patient, DNA repair disorders, 295T Brush-border, 806, 1437F, 1438F Bs1 transposon, 318T Budding yeast(s), 34F alternative splicing, 479–480 cell type specification, 455–457, 456F, 457F see also Mating-type switching E. coli coli vs., 34 genome, 18T, 34 haploid vs. diploid state, 34 as model eucaryote, 33–34 replication origins, 286, 287F reproductive cycles, 413F see also Saccharomyces cerevisiae Bundle-sheath cells, 846 a-Bungarotoxin, effect on acetylcholine receptors, 685 Burkitt’s lymphoma Mycgene, translocation activating Myc gene, 1239 viral causation, 1228T, 1499 BY2 immortal cell lines, cell culture micrograph, 504F BZIP gene regulatory proteins, family members in different eucaryotes, 1400T

1321 adult anatomy, apoptosis, ICE, 1118 cell numbers, 1321 Caenorhabdi habditis tis elegans development see Caenor development gene regulatory proteins, 1400T genes dosage compensation, 475, 476F for multicellular development, 1323 see also under Caenorhabditis elegans development genome, 18T, 20T, 552 hermaphrodites, 1321 microtubules, 982F as model organism, 36–37, 39 molt cycle, 1322 mutants, 557F, 564F protein interaction maps, 188 RNA interference (RNAi), 571, 571F sex determination, 1282F 1282F,, 1286 sexual reproduction, 1321 size, 1489 Caenorhabditis elegans development, 1321–1328

C2C2 (Zn finger)/GATA gene regulatory proteins, 1400T C2H2 (Zn finger) gene regulatory proteins, 1400T C3 plants, 846–847, 847F C4 plants, 846–847, 847F C6 (Zn finger) gene regulatory proteins, 1400T Ca2+ ATPase see Calcium pump (Ca2+-ATPase) under Calmodulin Ca2+/calmodulin see underCalmodulin Ca2+ pump see Calcium pump (Ca2+-ATPase) Cadherin(s), 1133–1150 bacterial invasion and, 1508 b-catenin and, 949, 1142 Ca2+-mediated cell–cell adhesion, 1135–1136 , 1137–1138 classical cadherins, 1136, 1138T, 1177T cadherin domain repeats, 1137 catenin link to actin cytoskeleton, 1142, 1142F E-cadherin, 1136, 1138T, 1141, 1249–1250 N-cadherin, 1136, 1138T, 1388 P-cadherin, 1136, 1138T signaling, 1145 structure, 1139F VE-cadherin, 1138T, 1145 developmental expression embryo compaction, 1136, 1136F neural development, 1140, 1140F, 1141F, 1141F, 1388 selective adhesion, 1139–1140, 1139F, 1140F selective assortment, 1140–1141, 1141F, 1142F distribution, 1135, 1136, 1136F diversity, 1136–1137, 1137F, 1138T family members, 1138T genes, in neuronal guidance, 1388 homophilic adhesion, 1137–1139, 1138F binding affinity, 1138 tissue segregation and, 1140–1141 “Velcro principle,”1138–1139, 1139F nervous tissue, 1136, 1136F 1136F,, 1388 nonclassical cadherins, 1136–1137, 1138T, 1177T cadherin 23, 1138T cadherin domain repeats, 1137 desmocollins, 1136, 1138T desmogelins, 1136, 1138T Fat proteins, 1137, 1138T Flamingo protein, 1137, 1138T, 1145 protocadherins, 1136, 1138T signaling, 1145 T-cadherin, 1136–1137, 1138T signaling functions, 1136–1137, 1145 structure, 1136–1137, 1137F, 1139F cadherin domain motif, 1137 conformational changes, 1138 intracellular domains, 1142 synapse formation and, 1148 see also speci specific fic types Caenorhabditis elegans, 37f, 39F, 1321–1328, 1322F

ABa cell, 1324, 1324F, 1324FF ABp cell, 1324, 1324F, 1324FF asymmetric cell division, 1323–1324, 1323F cell death, 1327–1328, 1327F cell fate, 1322 cell lineage, 1321, 1322, 1322F, 1324 cell patterning, 1324 E cell, 1324, 1324FF

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



egg cell, 1323 EMS cell, 1324, 1324F 1324F,, 1324FF epithelial apico-basal polarity mechanisms, 1155–1156 founder cells, 1322 gene regulatory proteins, 1400T genes, 1323 heterochronic genes and timing, 1326–1327, 1326F maternal effect, 1323–1324 mom (more mesoderm), 1325 pop (plenty of pharynx), 1325 see also indiv individual idual genes germ cells, 1322–1323, 1323 gut, 1322F inductive cell–cell interactions, 1324, 1324FF MS cells, 1324, 1324FF P2 cell, 1324, 1324FF P granules, 1323–1324, 1323F polarizing signal, 1323 pop-1, 1325 precision, 1322 sex determination, 1282F, 1286 Vasa protein, 1324 Wnt signaling pathway, 1324, 1324F, 1324F, 1325 Caged molecules, 594–595, 595F 595F,, 596F Cajal bodies, 241, 241F, 363–364, 365F, 594F Calcium-activated potassium channel(s), 690 Calcium/calcium ion (Ca2+) cadherin-mediated cell–cell adhesion, 1135–1136

cytosolic concentrations, 660 egg activation, 1299 gap junction permeability, 1161–1162 intracellular measurement, 596–597, 597F as intracellular messenger, 912–916 regulation of concentration in cytosol, 912–913 regulation of cytosol concentration, 912–913 signaling see Calcium signaling storage, sarcoplasmic reticulum, 725–726 transmitter release at synapses, 804, 808, 912–913 Calcium channel(s), 912, 913 IP3-gated Ca2+-release channels, 910, 911 ryanodine receptors, 912 Calcium pump (Ca2+-ATPase), 660–661 autophosphorylation, 660 mechanism, 661F muscle contraction, 660 structure, 660–661, 661F Calcium-sensitive fluorescent indicators, 912, 912F Calcium signaling, 912–916 Ca2+-induced Ca2+ release, 914 Ca2+ oscillations, 912–914, 913F Ca2+ spikes, 913, 913F Ca2+ wave, fertilization, 912, 912F 912F,, 1299 calcium release, 910, 913 calmodulin and, 914–916, 914F, 915F, 1030 entry into cytosol, 910–912 also Calcium channel(s) IP3see -mediated, 910, 910F see also Inositol phospholipid(s) mechanisms keeping cytosolic Ca2+ levels low, 912, 912F oscillation frequency, 912–914 PKC and, 911 at synapses, 912 ubiquitous intracellular messenger, 912 Calcium wave, egg cells, 912, 912F, 1299 Callus formation, plant cells, 504–505, 568 Calmodulin, 914–916 action on CaM-kinase II, 915, 915F Bordetella adenylyl cyclase binding, 1503 Ca2+ binding, 1030 Ca2+/calmodulin, 914 structure, 144F Calnexin, as chaperone protein, 738–739, 767 Calreticulin, protein chaperone function, 738–739 Calvin cycle see Carbon-fixation cycle CaM-kinase (Ca2+/calmodulin-dependent protein kinase), 915–916, 915F, 916F CAMP see Cyclic AMP Canaliculi, 1442 Cancer, 1205–1267 angiogenesis in cornea, 1448 apoptosis, 1127 benign vs. malignant, 1206, 1207F causes/pathogenesis, 1208 carcinogens see Carcinogens DNA repair defects, 277–278, 295–296, 295T,


see also DNA repair environmental factors, 1224, 1224F epigenetic change, 1208, 1213 genes see Cancer-critical genes preventable, 1224–1230 somatic mutations, 265, 1208, 1209 see also Oncogene(s); Tumor suppressor genes (TSGs) cells see Cancer cells clonality clonal evolution, 1212–1213, 1212F, 1227 origin from single mutant cell, 1207–1208, 1209F see also Cancer cells ECM degradation, 1194, 1194F epidemiology, 265, 1229–1230 epigenetic vs. genetic change, 1214F epithelial–mesenchymal transitions, 1141 growth/progression, 1210 cell proliferation, 1107–1108 contributing properties, 1223 defective cell death, 1215–1216 defective cell differentiation, 1215–1216 ECM degradation, 1193 invasiveness, 1220 see also Metastases metastasis see Metastases natural selection, 1212–1213 oxygen as limiting factor, 1220 growth rate, 1212 incidence environmental factors, 1224, 1224F as function of age, 1209, 1209F Mormons, 1225 USA, 1207F, 1229F variation between countries, 1228T initiation, 1226, 1227 as a microevolutionary process, 1205–1224 mortality, USA, 1229F nomenclature, 1206 prevention, 1224–1230 primary, 1207 progression, 1210 colorectal cancer, 1250–1255, 1255F genetic instability effect, 1214–1215 microenvironment, 1222, 1222F natural selection, 1212–1213 propagation, stem cell role, 1218 recurrence, 1219 stem cells, 1217–1218 origin, 1218–1219 properties, 1219 treatment, 1256–1265 antibodies targeting oncogenic proteins, 1260 evolution of resistance to therapy, 1259 new therapies, 1257–1360 sensitivity, 1219 taxol, 988 1257 therapies, seetraditional also Mutation(s); specific cancers Cancer cells, 1241–1255 blood supply, dependence, 1262 cell crawling, 1008 cell division rate, 1209 cell lines, 506T colonization without restraint, 1206–1207 epigenetic changes, DNA methylation, 1213 fluorescence-activated cell sorter, 1218, 1218F heritable properties, 1206 loss of contact inhibition, 1233F molecular characterization, DNA microarrays, 412, 414F reproduction without restraint, 1206–1207 stem cells, 1217–1219 telomerase activity, 1217 Cancer-critical genes, 1230–1241 analysis in developing embryos, 1241–1242 analysis in transgenic mice, 1241–1242 cell proliferation regulation, 1242–1244 identification, 1230–1241 cell transformation assay, 1232–1233 chromosome abnormalities, 1231–1232 dominant vs recessive (oncogene vs tumor suppressor gene), 1232F hereditary cancer syndromes, 1234–1235 loss of heterozygosity, 1236 Ras gene, 1233–1234 Rb gene, 1234–1235, 1336F retroviruses, 1233

p53 gene/protein and, 1106 Rb gene/protein, 1104–1105, 1234–1235, 1344F varied types of mutation, 1234–1236 see also Mutation(s); Oncogene(s); Tumor suppressor genes (TSGs); individual genes Cancer syndromes, hereditary, 1234–1235 Canine parvovirus, microtubule-based movement in axons, 1517 Capacitation, 1294, 1297 Cap-binding complex (CBC), 346–347 Capillaries, 1446–1447, 1446F response to wounding, 1448, 1448F see also Angiogenesis Capping, of actin filaments see Actin/actin filaments 5¢ Capping of eucaryotic mRNA, 344, 346–347, 346F cap-binding complex, 346–347 decapping, 492 functions, 346–347 guanyl transferase reaction, 346 methyl transferase reaction, 346 phosphatase reaction, 346 pre-mRNA ordering, 352 reaction, 346, 347F Capping protein, actin filament, 1003 Capsid(s) (viral), 148, 148F, 149F, 150F, 1489F, 1497, 1513 Cap snatching, 1517 Capsules, phagocytosis resistance mechanisms, 1532 CapZ protein, 1003 Carbamoyl phosphate synthase, molecular tunneling, 167–168, 168F Carbohydrates, 55 biosynthesis, 844 see also Carbon fixation see also Polysaccharides; Sugars Carbon atomic structure, 46F cell components, 54–55 double bonds between, 106F skeletons, 106F Carbon–carbon double bonds, 106F Carbon dioxide (CO2) fixation see Carbon fixation metabolic production, 98–99 see also Citric acid cycle Carbon dioxide (CO2) pump, carbon fixation, 846–847 Carbon fixation, 13, 69 ATP hydrolysis, 845, 845F chloroplasts, 69, 843–848 CO2 (carbon dioxide), 13, 844–845 CO2 pump, 846–847 cyanobacteria, 840, 873–875 evolution, 872–875 NADPH, 845, 845F reactions, 71F,, 844–847carboxylase, 71F , 845F 844, 844F ribulose bisphosphate Carbon-fixation cycle, 71F 71F,, 844–847, 845F Carbonic anhydrase, reaction rates, 161F Carbon monoxide, as intercellular signal, 889 Carboxylated biotin, 84F Carboxyl groups, fatty acids, 114F Carboxypeptidase, zinc ion dependence, 167 Carcinogenesis, 1208 Carcinogens, 1208 cancer after exposure, 1210, 1210F, 1225 identification for cancer avoidance, 1229–1230 industrial, weighing risks, 1230 metabolic activation, 1225, 1225F mutagenicity, 1225, 1225F types, 1225–1229 Carcinoma, 1206, 1234 Cardiac muscle, 1031 adherens junctions, 1142 cells, 1463–1464, 1463F mitochondria, 816F mutational effects, 1031F sarcomeres, 1026 Cardiolipin, 867–867, 868F Cardiovascular disease, 1500 Cargo, 749, 750F, 767F Cargo receptor(s), 754 Carrier protein(s), 652–667 active transport, 654–667 asymmetric cellular distribution, 658–659 ATP-driven pumps, 656F, 659–660, 660F



conformational changes, 653F, 655, 655F coupled carriers, 656F coupling to proton gradients, 822–823, 823F evolution, 655 kinetics, 655, 655F light-driven pumps, 656F localization, 1151 mechanism, 655F membrane transport, 652–643 reversibility, 826–827, 826F specificity, 652 see also ABC transporter(s); Active transport; specific proteins Cartilage, 1468–1469 bone repair, 1471 cells, 1467, 1468–1469, 1469F see also Chondrocytes erosion by osteoclasts, 1472–1473 growth, 1468–1469, 1469F defective in achondroplasia, 1471–1472, 1472F mineralization, 1471 ‘models’in bone development, 1470, 1471F replacement by bone, 1470–1471, 1471F Casein kinase 1, 949 Caspase(s), 1118–1120 activation, 1118, 1119F, 1120F see also Procaspase(s) caspase-3, 1119 caspase-8, 1573F caspase recruitment domain, 1119 human, 1119T inhibition, 1124–1125, 1127 interleukin-1-converting enzyme, 1118 signaling pathways, 1119 Caspase recruitment domain (CARD), caspases, 1119 Catabolism, 88–103 activated carriers, 79F anabolism vs., 67F definition, 66, 88 oxidation of organic molecules, 70, 100F citric acid cycle see Citric acid cycle glycolysis see Glycolysis oxidative phosphorylation see Oxidative phosphorylation sugars, 55–58, 88 Catabolite activator protein (CAP), 418T, 420F, 420F, 436 Catalase, 144F, 721 Catalysis autocatalysis and origin of life, 7F, 401 catalysts, 73, 158–159 see also Enzyme(s); Ribozymes in controlled energy use by cells, 65–87 energy barriers, 72–73 by RNA see Catalytic RNA; Ribozymes Catalytic antibodies, 160, 161F Catalytic RNA origin of life, 401, 402, 402F

CD4 T-cell(s), 1580, 1592T, 1599F negative selection, 1587, 1587F positive selection, 1586, 1587F see also Helper T-cell(s) (TH) CD8 protein, 1580–1581, 1580T, 1581F, 1592T, 1592T, 1599F antigen presentation, 1590 CD8 T-cell(s), 1580, 1592T, 1599F negative selection, 1587, 1587F positive selection, 1586, 1587F see also Cytotoxic T-cells T-cells ( TC) CD9, sperm–egg binding, 1298–1299 CD28, 1590, 1591F, 1592T CD40 ligand, 1590, 1592T, 1594, 1595F, 1595F, 1597 CD40 receptor protein, 1590, 1592T on B cell, 1597, 1598T on macrophage, 1593F, 1594 CD80, 1592T CD86, 1592T Cdc6, 288, 289F, 1068 Cdc20, APC/C regulation, 1064, 1066, 1066T, 1087, 1100 Cdc25 phosphatase, 1063, 1071, 1071F Cdc42, 1042F, 1043, 1156, 1516 Cdcgenes, Cdc genes, 1056–1057 temperature-sensitive mutants, 1057, 1057F Cdh1, APC/C regulation, 1064, 1066T, 1101 Cdk (cyclin-dependent kinase) see Cyclindependent kinases (Cdks) Cdk4, in cancer, 1243, 1244F cDNA, 542 clones, 542, 543, 543F 543F,, 544 PCR cloning, 546F libraries, 542, 543F, 544 synthesis, 543F, 574 Cdt1, ORC binding, 1068 Ced3 gene, 1327, 1327F Ced4 gene, 1327, 1327F Ced9 gene, 1327, 1327F C. elegans see Caenor Caenorhabdi habditis tis elegans elegans Cell(s) behavior cytoskeleton involvement, 1025–1050 see also Cell motility/movement chemical components, 45–65 carbon compounds, 54–55 small molecules, 55 free energy information transmission, 8 inorganic chemical sources (lithotrophic cells), 12, 13FF light sources (phototrophic cells), 12 from living organisms (organotrophic cells), 12 genome see Genome(s) isolation, 501–517 mixed suspensions, 502 separation techniques, 502, 503F, 503FF origins of life, 400–408

junction(s); Extracellular matrix (ECM) Cell adhesion molecules (CAMs), 1177T cadherins see Cadherin(s) cell–cell adhesion, 1177T see also Cadherin(s); Cell–cell adhesion cell–matrix adhesion, 1177T see also Cell–matrix adhesions; Integrin(s) ICAMs, 411, 1146, 1592T immunoglobulin superfamily, 1145, 1146–1147 integrin superfamily see Integrin(s) selectins, 1145–1146 synapse formation and, 1147–1148 T-cell function, 1571 see also speci specific fic types Cell–cell adhesion assays, 1135 Ca2+ role, 1135–1136 cell adhesion molecules, 1177T cadherins, 1133–1150 dendritic cells, 1571 immunoglobulin superfamily, 1145,

self-replication, 404, 407F 378–379 ribosomes, spliceosome active site, 352 see also Ribozymes; Self-splicing RNA Catastrophe factors, 1080 Catastrophe, in dynamic instability, 1003, 1080 Catenin(s) b-Catenin cadherin binding, 949, 1142 colorectal cancer, 1253 p120-Catenin, 1142 g-Catenin -Catenin (plakoglobin), cadherin binding, 1142 cell–cell adhesion and intracellular signaling, 949, 1142, 1145 classical cadherin link to actin filaments, 1142, 1142F Cation, definition, 47 Cation-transporting ATP ATPases ases see Calcium pump (Ca2+-ATPase) Caulobacter cresentus, cytoskeleton shape, 991 Caveolae, 790, 790F Caveolin, 790 CBC (cap-binding complex), 347 C-Cbl protein, 926 CCR5, HIV receptor, 1505–1506, 1505F CD3 complex, T cells, 1590F, 1592T, 1592T, 1599F CD4 protein, 1580–1581, 1580T, 1581F, 1592T, 1599F antigen presentation, 1590 HIV receptor, 1505, 1505F role in viral entry into cells, 765F

polarization Polarity/polarization procaryotes, see diversity, 14–15, 14F, 15F self-reproduction by autocatalysis, 7F terminal differentiation, 1103 tree of life archaean cells, 16 bacterial cells, 14F 14F,, 15–16, 15F, 25, 25F eucaryotic cells, 14, 26–32 unit of living matter, 1 universal properties ATP as energy currency, 8–9 DNA as hereditary information store, 2, 3F gene families in common, 23, 24T plasma membrane, 9–10, 10F proteins as catalysts and executive molecules, 5–6, 6F ribosomal machinery for protein synthesis, 6–7, 8F RNA as intermediary in information transfer, 4, 5F small molecules and fundamental chemistry, 8–9, 45–123 vehicle for hereditary information, 2 see also entri entries es beginning cell/cellular cell/cellular;; speci specific fic components; specific types Cell adhesion, 1131–1204, 1177T bacterial invasion of host cells, 1508 cell–cell see Cell–cell adhesion cell–matrix see Cell–matrix adhesions traction for cell movement, 1040–1041 see also Cell adhesion molecules (CAMs); Cell

886–887 speed response, , 887F see alsoofCell junction(s); Neurotransmitter(s); Receptor(s); Signaling molecule(s)/pathway(s); Signal transduction; individual signaling molecules and pathways Cell crawling, 1006, 1008, 1036, 1036F activities involved, 1036 leading edge, 1040F see also Cell motility/movement Cell culture, 501–517 anchorage dependence, 1175–1176, 1175F bacterial, cloning vector production, 540, 541F cells in culture, 504F definitions, 502–504 historical aspects, 504 mammalian cell cycle analysis, 1059, 1059F ‘immortalized,’ 1059 replicative senescence, 1059, 1107 plant, 504–505, 568 primary cultures, 504 secondary cultures, 504 tissue segregation in, 1140–1141, 1142F see also Cell lines; Tissue culture Cell cycle, 554F 554F,, 1053–1113, 1054F analysis animal embryos, 1057–1058, 1057F, 1058F BrdU labeling, 285, 285F, 1059, 1059F DNA microarrays, 1065 flow cytometry, 1059–1060, 1060F


integrins, 1134, 1145, 1146 selectins, 1145–1146 cell proliferation and, 1153–1155 heterophilic vs. homophilic binding, 1138F scaffold proteins, 1145, 1148–1149 selective adhesion, 1139–1140, 1139F, 1140F selective assortment, 1140–1141, 1140F, 1141F, 1142F signaling, 1145 synapse formation and, 1147–1149, 1149F see also Cell junction(s); Cell–matrix adhesions; Extracellular matrix (ECM) Cell–cell contact actin polymerization via Rac, 1047 bone marrow, 1458 capillary sprouting, 1448 see also Cell–cell adhesion; Cell junction(s) Cell coat (glycocalyx), 636, 637F Cell communication, 879–903 adaptation, 902, 920, 920F autocrine, 881 budding yeast, mating, 880, 880F carbon monoxide, 889 cell-surface receptors see Cell-surface receptor(s) contact dependent, 881, 881F see also Ephrin(s); Notch receptor protein different responses in target cell types, 885, 885F endocrine, 882–883, 882F, 883F see also Hormones evolution, 955 extracellular signals, combinatorial actions, 884, 885F gap junctions, 884, 884F nitric oxide, 887–889, 888F paracrine, 881, 882F, 883 plants, 955–962

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



mammalian cell culture, 1059, 1059F progression analysis, 1059 yeast mutants, 1056–1057, 1056F, 1057F arrest, 1061 abnormal proliferation signals and, 1107–1108, 1108F DNA damage and, 303–304, 1105–1106, 1106F G0 phase, 1103 male gametes, 1281 cancer cells, 1107–1108 checkpoints see Cell cycle control chromosome changes, 208–209, 208F, 209–210, 209F control systems see Cell cycle control nucleolar changes, 363, 363F overview, 1054–1060 phases, 208F, 285F, 1054–1055, 1054F, 1055F G0 (G zero), 488–489, 489, 1103 eIF-2 regulation, 488–489 G1 phase, 285F, 1055, 1100–1101, 1100F mitogen actions, 1103 G2 phase, 285F, 1055 interphase, 208F, 209, 1055 M phase, 208F, 285F, 1054, 1071 cytokinesis see Cytokinesis mitosis see Mitosis see also Meiosis S phase (DNA synthesis), 285F, 1067–1071 chromatin protein production, 1074 chromosome duplication, 1054, 1067, 1068F, 1069–1070 DNA replication, 284, 285, 1067–1069 histone synthesis, 289–290 labelled cells, 1059F meiotic, 1090, 1272 sister chromatid cohesion, 1070–1071 timing, 284, 285 see also DNA replication universal characteristics, 1053 start (restriction) point, 1055, 1061, 1066, 1105 timing, 1056 see also Cell division; Cell growth; Cell proliferation Cell cycle control, 177–178, 1060–1067, 1066F analysis animal embryos, 1057–1058, 1057F, 1058F importance, 1053 mammalian cell culture, 1059, 1059F yeast mutants, 1056–1057, 1056F, 1057F cancer and, 1216–1217, 1243, 1244F checkpoints, 505, 1061 defects making cancer cells vulnerable, 1216–1217 DNA damage, 303, 1105–1107 G2/M checkpoint, 1061, 1062, 1066, 1105 meiotic, 1281 metaphase-to-anaphase transition, 1061, 1066, 1071

see also specif specific ic types Cell determination, 1311–1312, 1312F combinatorial control, 465–466 Cell differentiation, 411, 454–477 cancer and, 1215–1216 common processes, 412 differing response to extracellular signals, 415, 464 DNA rearrangement, bacterial phase variation, 454–455, 455f genome constancy, 411–412, 413F patterns of gene expression, 412, 464–465, 464F, 465F see also Combinatorial control protein differences, 412 specialization, 412 terminal, 1103 see also Developmental genetics; Gene expression regulation Cell diversification, role of Notch, 1362 Cell division, 1053, 1055F asymmetric, 1099, 1099F C. elegans embryo, 1323–1324, 1323F oocytes, 1289–1290, 1289F plant development, 1400 cell death balance, 1102 cell number and, 1102 control, 1101–1112 density-dependent (contact inhibition), 1110, 1110F DNA damage response, 1105–1107 mitogens see Mitogen(s) see also speci specific fic factors coordinated growth and division, 1108–1110, 1109F cytoskeletal role, 966–967, 967F delay, 1103 density-dependent inhibition (contact inhibition), 1110, 1233–1234 limits, 1059, 1107 density-dependent, 1110, 1233–1234 see also Replicative cell senescence plane of, 1095–1097 plant cell(s), 1195 stem cells, 1425 total cell mass control, 1111–1112 see also Cell cycle; Cell growth; Cell proliferation; Cytokinesis; Meiosis; Mitosis Cell doctrine, 579 Cell extracts (homogenates ), 510, 512 Cell fate determinants, asymmetric cell division, 1099 Cell fractionation, 510–512 cell-free systems see Cell-free systems cell lysis, 510 chromatography, 512–514 electrophoresis, 517, 518F, 521–522 macromolecule/organelle separation, 510–511, 511F

1088,1066, spindle assemblypoint), checkpoint, 1088F start (restriction 1055, 1061, 1105 cyclical proteolysis, 1064, 1065F, 1066T APC/C see Anaphase promoting complex (APC/C) SCF enzyme complex, 1064, 1065F eucaryotic similarities, 1056 functions, 1060–1061 intracellular triggering of cell-cycle events, DNA replication, 1067–1069, 1068F molecular/biochemical switches, 1061, 1065–1066, 1075 regulatory proteins, 1066T Cdks see Cyclin-dependent kinases (CDKs) cyclins see Cyclin(s) E2F proteins, 1103–1105 inhibitory phosphorylation, 1063–1064 p53 and, 1105 Rb proteins, 1104–1105, 1104F ubiquitin ligases see Ubiquitin ligase(s) see also specif specific ic proteins resetting, 1069 as timer/clock, 1060, 1061F transcriptional regulation, 1065, 1104, 1104F Cell death apoptotic see Apoptosis (programmed cell death) cell number and, 1102 defective in cancer, 1215–1216 neurons, 1389–1390

mitochondria, 817F 510–511, 510F, 511F, 512F ultracentrifugation, see also Protein analysis Cell-free systems biological process reconstruction, 511–512, 516 cell cycle analysis, 1058, 1058F cell fractionation, 516 vesicular transport study, 752, 752F Cell growth, 1053 anchorage dependence, 1175–1176, 1175F control, 1101–1112 coordinated growth and division, 1108–1110 , 1109F organ growth, 1108 organism growth, 1108 see also Cell cycle; Cell division; Cell proliferation Cell homogenate(s), 510, 512 Cell junction(s), 1131–1204 anchoring junctions, 1132, 1132F, 1133–1150, 1133T, 1135T cell–cell, 1132, 1133–1150, 1133T, 1135T adherens junction see Adherens junction(s) desmosome see Desmosome(s) immunoglobulin superfamily, 1145, 1146–1147

selectins, 1145–1146 selective adhesion, 1139–1140, 1139F, 1140F selective assortment, 1140–1141, 1140F, 1141F, 1142F signaling, 1145

see also Cadherin(s) cell–matrix, 1133T, 1135T, 1169–1178 actin-linked, 1133T, 1134, 1135T focal adhesions, 1170 hemidesmosomes see Hemidesmosome(s) see also Integrin(s) intermediate filament attachment, 1133T see also Cell–cell adhesion; Cell–matrix adhesions channel-forming junctions, 1132, 1132F, 1133T, 1133T, 1158–1164

gap junction see Gap junction(s) plasmodesmata, 1158, 1162–1163, 1163F epithelial, 1133–1135 see also Epithelia functional classification, 1132, 1133T homophilic vs. heterophilic, 1137, 1138F occluding junctions, 1132, 1132F, 1133T, 1133T, 1150–1158

septate, 1154–1155, 1154F seeTight tight junction see Tight junction(s) signal-relaying junctions, 1132, 1132F, 1133T chemical synapse see Chemical synapse(s) immunological synapse, 1132 transmembrane signaling, 1132, 1133T transmembrane adhesion proteins, 1134–1135, 1134F, 1135T cadherin superfamily, 1133–1150 immunoglobulin superfamily, 1145, 1146–1147

integrin superfamily, 1134, 1145, 1146, 1169–1178

selectins, 1145–1146 see also Cell adhesion molecules (CAMs); specific types see also Cell adhesion; Extracellular matrix (ECM); specific types Cell lines eucaryotic, 505, 506T hybrid cells, 509F see also Hybridomas immortal, 504F, 505, 506T, 1059 primary vs. secondary, 504 transformed, 505, 506T see also Cell culture Cell–matrix adhesions, 1133T, 1134, 1134F, 1135T, 1169–1178

actin-linked, 1133T, 1134, 1135T CAMs, 1177T fibronectin and, 1191 hemidesmosomes see Hemidesmosome(s) see also Cell–cell adhesion; Cell junction(s); Extracellular matrix (ECM); Integrin(s) Cell-mediated immune responses, 1540, 1540–1551, 1540F, 1569–1589 intracellular pathogens, 1572 transplantation reactions, 1575 see also MHC (major histocompatibility complex); T cell(s); T cell receptor(s) Cellsee memory, 458, 458F, 466 also Cell454, differentiation Cell migration developmental, 1140, 1140F 1140F,, 1373–1375 ECM degradation, 1193, 1194, 1194F external signals/guidance molecules, 1045, 1140 gut epithelial cells, from crypts to villi, 1440F integrins and, 1170–1171 neuronal, 1385F see also Cell motility/movement Cell motility/movement in animal development, 1363–1378 see also Cell migration; Development contribution of myosin II, 1039F crawling see Cell crawling microscopy, 583 protrusion, 1037–1038, 1039F traction, 1040–1041, 1041F via actin polymerization, 1037–1039 Cell number, 1102 Cell plate, 1097 Cell proliferation, 1053 abnormal signals, cell cycle arrest, 1107–1108 anchorage dependence, 1175–1176, 1175F cancer cells, 1107–1108, 1217 DNA tumor virus proteins, 1248, 1249F see also Cancer coordinated growth and division, 1108–1110 density-dependent inhibition, 1110, 1110F integrins and, 1175–1176 limitation, telomere length, 293


requirements, 1244, 1245F scaffold proteins and junctional complexes, 1153–1155

total cell mass control, 1111–1112 see also Cell cycle; Cell division; Cell growth; Replicative cell senescence Cell renewal and turnover epidermis, 1417–1428 in liver, 1443 mammary gland, 1426–1428 small intestine, 1436–1438, 1436F 1436F,, 1439 see also Regeneration; Stem cell(s) Cell senescence macrophage scavenging, 787 replicative see Replicative cell senescence telomere shortening, 293 Cell signaling, 879–974 all-or-none response, 901 general principles, 879–903 see also Cell communication; Signaling molecule(s)/pathway(s); Signal transduction Cell size, control, 1109–1110 Cell-surface receptor(s), 891–895, 893F, 894F, 936F enzyme-linked, 956, 958F G-protein linked see G protein-coupled receptors (GPCRs) intracellular receptors vs., 881, 881F ion-channel-linked see Ion channel(s) in NFkB pathway (Toll family), 1530 plants, 956–960 see also individual types Cell survival integrins and, 1175–1176 regulation of hemopoiesis, 1462 see also Cell death Cell suspension(s), mixed, 502 Cell transformation assay, for oncogenes, 1232 Cellular interactions, mathematical modelling, 35–36, 35F Cellularization, 1099 Cellulase, protein structure, 529F Cellulose control of oriented plant cell expansion, 1406 microfibrils, 1197–1198, 1198F cross-linking g lycans, 1196, 1198, 1198F, 1199T direction of growth and, 1199–1200, 1199F structure, 1197, 1197F plant cell wall, 1180, 1196, 1197–1198, 1198F, 1199T microtubules and deposition, 1200–1202, 1200F, 1201F Cellulose synthase, 1199–1200, 1201 Cell wall(s) plant see Plant cell wall procaryotes, 14, 1490F, 1527 CENP-A, 230–231, 232F Central dogma, 331 Central lymphoid organ,(CNS) 1541F, 1543, 1543F Central nervous system apoptosis, 1115–1116 early embryonic origins, 1367F progenitor cells, 1386F protein aggregation vulnerability, 397 repair, 1479 see also Nervous system Central spindle stimulation model, 1096F 1096F,, 1097F Centrifugation techniques, 510–511, 510F, 511F, 512F molecular weight determination, 522–523 sedimentation coefficient, 511, 522 Centriole(s), 993, 993F, 1076, 1076F replication, 1078, 1078F zygote, 1301, 1301F Centromere(s), 228–230 chromatin structure, 231–233, 231F heterochromatin, 228–229, 232F histones, H3 CENP-A variant, 230–231, 232F memory circuits, 231, 233F see also Chromatin chromosome replication, 209–210, 210, 210F, 1076, 1076F DNA sequence, 210, 229–230 plasticity, 229–230, 230F structure, 229–230, 229F Centrosome, 1076, 1076F center-seeking behavior, 996F composition, 992 duplication and spindle assembly, 1078, 1078F,


see also specif specific ic types Channel protein(s), 652–653 conformational changes, 653F passive transport, 653, 654F see also Ion channel(s); specific types Chaperones bacterial, GroEL, 390F eucaryotic, 388–390, 390F 390F,, 715, 716F 716F,, 717 mitochondrial protein import, 715, 716–717, 716F protein folding role, 130–131, 388–390 see also specif specific ic molecules Charcot–Marie–Tooth Charcot–Marie–T ooth disease, 1048 CheA, 943, 944, 944F under Cell cycle Checkpoints in cell-cycle see underCell control Chemical biology, 527 Chemical bonds, 46–50, 48F, 106F electron interactions, 46–47 energy carriers, 61, 69F see also ATP (adenosine triphosphate) Chemical groups, 107F Chemical reactions, free energy, 75F Chemical synapse(s), 682, 684 acetylcholine receptors, 684 cell signaling, 882 excitatory, 684 inhibitory, 684 mechanism of action, 683F see also Neuromuscular junction (NMJ); Neurotransmitter(s) Chemiosmotic coupling, 813–814, 814F ATP production, 817–819, 819F see also ATP synthesis

photochemistry, 847–848, 848F, 849–850, 849F, 850F see also Photosynthesis; Photosystem(s) see also Chloroplast(s) Chloroplast(s), 30F, 840–855 bacterial resemblance, 857, 863 b barrel proteins, 635 biogenesis, 856, 856F, 867 biosynthetic reactions, 855 cell-free systems, 511 development, 698, 699F distribution during cytokinesis, 1098 electron transport see Photosynthetic electron transport chain(s) energy interconversions, 842 evolutionary origin, 29, 31F, 840–841, 859–860, 874, 875F endosymbiont hypothesis, 859–860, 863–864 maintenance, 868–870 organelle–nuclear gene transfer, 859–860 function, 696 genetic system, 868–870, 869F genome, 856–870 copy number, 858 diversity, 857T, 859 evolution, 859–860, 868–870 genes, 863, 864F gene transfer, 864 higher plants, 863–864, 864F introns, 863 liverwort, 864F maternal inheritance, 866, 866F mutants, 867 replication, 858 variegation and, 866, 866F see also Non-Mendelian inheritance glycolysis, 854–855 growth and division, 857–858 lipid synthesis, 867 mitochondria vs., 842–843, 843F nuclear-encoded tissue-specific proteins, 867 photosynthesis see Photosynthesis protein import, 719–720, 720F protein synthesis, 856–857, 856F 856F,, 869F starch granules, 94F, 95, 841, 842F structure, 713F 713F,, 842–843, 842F, 843F transport, 854–855 see also Chlorophyll(s) Chloroquine, Plasmodium falciparum resistance, 666 Cholecystokinin, in enteroendocrine cells, 1437 Cholera toxin, 629, 906, 1492, 1493, 1504 Cholera, transmission, 1491 Cholesterol biosynthesis, 83F, 743, 744–745, 791 membranes, 620, 623 structure, 620, 620F, 620FF transport see Low-density lipoproteins (LDLs) Choline, 114F

839–840, 839F bacterial, see also Electron transport chain(s) Chemokine(s), 1533–1534, 1550–1551, 1550F in inflammatory response, 1453–1454 proteoglycans and, 1183 receptor, HIV binding, 765F Chemorepulsion, 1140 Chemotaxis, 1045, 1140 bacterial, 941–945, 943F, 945F growth cone guidance, 1388, 1388F neutrophils, 1045, 1045F Chiasma formation, 1274, 1274F 1274F,, 1276, 1276F Chick embryo limb development, 1312–1313, 1313F 1313F,, 1355 see also Limb buds (vertebrate) neural development, 1384F somites, 1372F Chickenpox virus, 1516–1517 Chimeras, mouse, 1380, 1380F 1380F,, 1381F Chimeric proteins, transcription activator proteins, 442F Chimpanzee(s), evolutionary relationships, 247, 247F, 248F Chk1 protein kinase, 1105, 1106F Chk2 protein kinase, 1105, 1106F Chlamydia pneumoniae, 1500, 1500F Chlamydia trachomatis, 1511F, 1512F, 1513 Chlamydomonas, flagella, 1032, 1033 Chloramphenicol, 384, 385T Chloride channels, 666, 673, 674F Chlorophyll(s), 848F

Chondroblasts,1468–1469, ECM production, Chondrocytes, 1469F1179 Chondrodysplasias, 1187 Chondroitin sulfate, 1179, 1388 Chondroma, definition, 1206 Chondrosarcoma, definition, 1206 Chordates, 1370 Chordin, 940, 1336 Chromatids see Sister chromatid(s) Chromatin, 202, 365F chromatin assembly factors (CAFs), 290 condensation, 243, 286, 288, 1070 see also Chromosome condensation; Heterochromatin euchromatin, 220 heterochromatin see Heterochromatin immunoprecipitation, 431–432, 432F nuclear sites, 239–240, 239F 239F,, 240F, 241F packing, 243, 244F remodeling see Chromatin remodeling structure see Chromatin structure see also Chromosome structure; Genome(s); Nucleosome(s) Chromatin assembly factors (CAFs), 290 Chromatin remodeling, 215–216, 442–443, 443F “barrier sequences,” 227–228 “code-writer enzyme,”226–227, 227F, 228F complexes, 215, 215F, 343, 344 histones, 216, 216F, 432, 433F nucleosomes, 216, 432, 433F position effect variegation, 226–227

1079 maturation, 1079 microtubules emanating from, 992–996, 993F reorientation, in cell locomotion, 1046 ‘search and capture’of chromosomes, 1082, 1084F Ceramide, biosynthesis, 744–745 Cerebral cortex, 1386F homunculus, 1391 neuronal migration, 1385F somatosensory region, 1392F Cervical cancer, 1211–1212, 1211F Cesa (cellulose synthase) genes, 1199–1200 Cesium chloride gradients, 511 CG (CpG) islands, 434, 470–471, 1527 DNA damage, 300–301, 470 evolution, 434, 470 role in innate immunity, 1530 seee Ci Ciss Golgi network (CGN) CGN se Ch4 elements, 318T Chagas’ disease, 1509 Chain-terminating nucleotides, DNA sequencing, 550 Channel-forming junctions, 1132, 1132F, 1133T, 1133T, 1158–1164

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



failure (nondisjunction), 1236F 1236F,, 1278–1279 mitotic, 865, 865F, 1089–1090, 1089F see also Meiosis; Mitosis; Sister chromatid(s) Chromosome structure, 554F

V(D)J recombination vs., 1568 Clathrin coat(s), 751, 754–755, 755F, 756F see also Clathrin-coated pit(s); Clathrin-coated vesicle(s) Clathrin-coated pit(s), 743F, 790F LDL endocytosis, 791–792, 791F 791F,, 793F pinocytosis, 789–790, 789F Clathrin-coated vesicle(s), 751, 754, 754F, 755F, 758F adaptin, 756F cargo receptors, 754–755 formation, 755–757, 756F pinching-off, 754–755, 756F, 758F regulation, 795 structure, 755F vesicular traffic, 754F Clathrin, structure, 754, 755F Claudins, 1153 CLAVATA 1, 957F Clavata1 protein, 1410, 1410F CLAVATA 3, 956, 957F Clavata3 protein, 1410, 1410F Cleavage and polyadenylation specificity factor (CPSF), 357–358, 357F Cleavage furrow, 1093, 1093F Cleavage stimulation factor F (CstF), polyadenylation, 357–358, 357F 357F,, 482–483 Clonal anergy, 1548, 1548F see also Immunological tolerance Clonal deletion, 1548, 1548F see also Immunological tolerance Clonal expansion, 1546 Clonal inactivation, 1548, 1548F Clonal selection theor y, adaptive immunity, 1544, 1545F

237FF,ic285F, 534,es535F, 590F see also specif specific techniqu techniques autosomes, 1271, 1284F bacterial, 202, 282, 283F 283F,, 1491F biological functions, 204 evolution, 207, 208F gene content, 204–205, 204F see also Genome(s) historical research, 195–196, 196 homologous see Homologous chromosomes (homologs) human, 202, 203F, 203FF chromosome 3 evolution, 208F chromosome 12 translocation, 204F chromosome 22, 205F, 206T evolution, 207, 208F gene organization, 205F mouse vs., 249–250, 249F replication origins, 287–288 replication rate, 283 see also Human genome lampbrush chromosomes, 234, 234F 234F,, 1288 mitotic see Mitotic chromosome(s)

cellsee cycle 208–209, 208F, 209, 243F alsochan Cellges, cycle; Interphase chromosome(s); Mitotic chromosome(s) centromere see Centromere(s) chromatin see Chromatin DNA packaging, 202–218, 202–219 global (higher order), 233–245 chromatin see Chromatin condensation see Chromosome condensation loops, 234–236, 234F, 235F polyteny see Polytene chromosome(s) linear, 209–210, 209F, 210F replication and, 209, 210F 210F,, 1067 see also Chromosome replication; Replication origin(s) seeTelomere(s) telomere see Telomere(s) X-inactivation see X-inactivation Chromosome translocation, 528F cancer role, 1261 Philadelphia chromosome in CML, 1208, 1208F, 1261, 1261F, 1262F Mycgene, translocation activating Myc gene, 1239 chromosome 12 and, 204F

Cloning, 507–508 see DNA cloning DNA cloning reproductive see Reproductive cloning therapeutic, 507F, 508 under DNA cloning vectors (DNA) see underDNA Cloverleaf structure, tRNAs, 368, 368F Cluster analysis of gene expression, 575, 575F CLV1 (CLAVATA 1), shoot meristem, 957F CLV3 (CLAVATA 3), 956, 957F Coactivator(s), 445, 447F Coat coloration, maternal effects, 474, 474F see also X-inactivation Coated vesicle(s), 751, 754 formation ARF-proteins, 759 coat-recruitment GTPases, 759–760 Sar1 protein, 759 vesicular transport, 751, 754, 754F see also speci specific fic types Coat-recruitment GTPase(s), 758–760 see also GTP-binding proteins (GTPases) Coaxial stack, RNA structure, 403F Cocci, 1490F

packaging, 1069 , 202–219 DNA, 202–218 post-mitotic chromosomes, 1090 see also Chromatin; Chromosome condensation; Chromosome structure polytene chromosomes see Polytene chromosome(s) puffs, 220–222, 239, 239F see also Polytene chromosome(s) rearrangements, 1231 see also Chromosome abnormalities; specific rearrangements replication see Chromosome replication sex chromosomes see Sex chromosome(s) species differences, 204–205, 205F structure see Chromosome structure see also Cytogenetics; Karyotype; individual chromosomes Chromosome abnormalities analysis see Cytogenetics; Karyotype cancer, 1215F, 1231, 1254F meiotic errors, 1278–1279 see also speci specific fic types Chromosome bands, 202–203, 203FF, 237FF Chromosome condensation, 243, 244F, 1075F ATP hydrolysis, 243 cell cycle var iation, 208–209, 208F, 209 chromatin condensation, 1070 chromatin packing, 243, 244F condensins see Condensin(s) M-Cdk role, 1071

DNA repair, homologous recombination, 309 genome evolution, 246–247 Chronic myelogenous leukemia (CML), 1208, 1208F 1208F,, 1210, 1218, 1261, 1261F, 1262F Chymotrypsin, 138F, 144F Cilia, 1031–1034 basal bodies, 1033, 1033F of epithelial cell apical domain, 806 flagella comparison, 1031 in left-right as ymmetry, 1376F, 1376F, 1377 microtubule arrangement, 1032F motility, 1031, 1031F polarity, of beating in respiratory tract, 1435F primary, 1034 Ciliary (axonemal) dynein, 1031–1032, 1032F, 1032F, 1033F hereditary defects, 1033 Ciliated cells, respiratory tract, 1434–1436 Ciliates, 28F Circadian clocks, 460–462, 461F, 462F Cis Golgi network (CGN) (intermediate compartment), 771F 771F,, 772, 778F Cisternal maturation model, of Golgi transport, 778 Citrate synthase, 122F Citric acid, 98, 98F, 122F Citric acid cycle, 97–99, 102F, 817 electron generation, 817 pathway, 98F, 122–123FF, 122F, 123F Clamp loader, 274, 275F, 276F Classical genetics see Genetics,classical Class switching, 1567–1568 B cell activation, 482–483

Cockayne’ s syndrome, 300 Code reader complex, 225–226, 225F “Coding problem,” 367 Codons, 6, 367, 367F, 368F Candida CUG codon, 383 initiation codon, 367F, 380, 489–491 mitochondrial genome, 861–862 redundancy, 246–247 stop codons, 367F, 381 synonymous, 247 wobble, 369, 369F see also Anticodon(s) Coenzyme A (CoA), 83–84, 83F, 84T, 117F see also Acetyl CoA Coenzyme Q, 831, 832F, 835 Coenzymes, 167, 167T see also specif specific ic types Cofilin (actin depolymerizing factor), 994F, 1001, 1002F lamellipodia, 1038F nucleotide hydrolysis, 1002 Cohesin(s), 1070–1071, 1087, 1272 N-terminal degradation, 395 structure, 1070F Coiled-coil motif, 135, 135F 135F,, 145, 349F Coilin, nuclear localization, 365F Co-immunoprecipitation, 458, 523 Colchicine (colcemid), 987, 988T, 1021 Collagen(s), 1131, 1184–1186, 1186T, 1467 in bone, 1469 degradation, 1194

RNA interference (RNAi), 443 RNA polymerase(s), 433 transcriptional, repressor protein-mediated, 445, 446F Chromatin structure, 211–218, 211–219 30nm fiber, 211, 211F, 212F, 216–218, 217F, 218F, 222 see also Histone(s); Nucleosome(s) “beads on a string,” 211, 211F, 212F centromeric see Centromere(s) direct inheritance, 230–234, 232F duplication during S phase, 1069–1070 effect on replication timing, 285–286 epigenetics, 472 historical aspects, 220 inheritance, 473–476 see also Heterochromatin interphase, loops, 234–236, 235F mitotic chromosomes, 243, 243F 243F,, 245 regulation, 219–233 see also Chromatin remodeling; Chromosome structure Chromatography, 512–514, 513F, 534F see also Protein purification; specific types Chromocenter, Drosophila polytene chromosomes, 237F Chromokinesins, 1077 Chromomeres, 234, 235F Chromoplast(s), development, 699F Chromosomal crossing-over see Homologous recombination (crossing-over) Chromosomal instability, 1217 see also Genetic instability Chromosome(s), 195–196, 202–205, 554F aberrant see Chromosome abnormalities analysis, 195F, 196, 196F, 202–203, 203F, 203FF,

X-chromosome inactivation see X-inactivation see also Mitotic chromosome(s) Chromosome deletion cancer role, 235F, 1234–1236, 1236F genome evolution, 246–247 Chromosome duplication centrosome duplication vs., 1078 S phase of cell cycle, 1054 chromatin duplication, 1069–1070 regulation of, 1067, 1068F Chromosome puffs, 220–222, 239, 239F see also Polytene chromosome(s) Chromosome replication, 208–209, 209–210, 209F, 210F centromere, 209–210, 210, 210F chromatin condensation and timing, 285–286 see also Chromosome condensation control see Cell cycle control duplication during S phase of cell cycle, 1054 replication origin, 209, 210F segregation during see Chromosome segregation sister chromatids see Sister chromatid(s) structural changes needed, 1067 telomere, 210, 210F see alsoTelomere(s) alsoTelomere(s) yeast, 210 see also Cell cycle; DNA replication; DNA synthesis; Mitosis Chromosome segregation meiotic (homologous chromosomes), 1276–1278


fibril-associated, 1185, 1187–1189, 1189F fibrillar vs., 1188–1189 fibrillar, 1184–1189, 1186T fibril-associated vs., 1188–1189 genes, 1184–1185 evolution, 1185–1186 mutations, 1187 structure, 144F, 146F, 1184, 1185F fibrils, 1185, 1185F, 1187, 1187F, 1189, 1189F fibrous protein, 146 post-translational modification, 1186, 1187F synthesis, 1186 collagen fibrils, 1187, 1188F pro-a chains, 1186 procollagen, 1186, 1187 propeptides, 1186 tensile strength, 1187–1188, 1189 type I, 1185, 1186T, 1187 type II, 1186T, 1187, 1469 type III, 1186T, 1187 type IV, 1165, 1166–1167, 1167F, 1168, 1185, 1186T type V, 1186T type VII, 1185, 1186T type IX, 1185, 1189, 1189F type XI, 1186T type XII, 1185, 1189 type XVII, 1185, 1186T type XVIII, 1165, 1185, 1186T Collagenases, 1194 Colloidal gold, electron microscopy, 606 Colon cancer see Colorectal cancer Colorectal cancer, 1250–1255, 1352F detection and screening, 1251–1252 genetic abnormalities, 1251–1253, 1252T, 1438 heterogeneity, 1256


phagocytosis, role, 788 Complex oligosaccharide(s), 773–775, 774F Complex traits, 563 Concentration gradient, 653 Condensation, chromosomes see Chromosome condensation Condensation reactions (macromolecule polymerization), 84–87, 85F sugars, 56, 57F Condensin(s), 243, 244F, 245F, 1075 Conditional mutation, 528F temperature-sensitive, 557, 557F, 1057, 1057F Cones (cone photoreceptors), 1432, 1432F Confocal microscope, 591F Confocal microscopy, 590–592, 591F, 592F Conformational changes allosteric regulation see Allosteric regulation cadherins, 1138 EF-Tu elongation factor, 180–181, 181F, 377 integrins, 1170–1172, 1172F ion channel(s), 668F motor protein(s), 1016–1019 negative feedback (feedback inhibition), 171, 172F prion protein (PrP), 397F, 398 ribozymes, 404, 406F tryptophan repressor, 433–434 Congenital abnormality, DNA repair defects, 295T Connective tissue, 1131, 1132F 1132F,, 1178F basal lamina and see Basal lamina cells, 1467–1474, 1467F differentiation, 1468–1470 types, 1467, 1467F see also individual cell types collagen see Collagen(s) extracellular matrix, 1178–1195

antigen-presenting cells, 1542F 1542F,, 1571, 1572F 1572F,, 1593F see also B7 proteins; CD40 ligand dendritic cells, 1571 lymphocyte activation, 1548 Coupled reactions see Reaction coupling Covalent bonds, 47, 48–50, 50F, 51F, 106F bond length, 48, 53T bond strength, 48–49, 53T dipoles, permanent, 50 geometry, 49, 50F ionic bonds vs., 48F phosphate bond energies, 93F phosphoanhydride bonds, 61, 93F phosphodiester, 61–62, 93F see also indiv individual idual types Covalent modification of proteins, 186–187, 186T see also Posttranslational modification; specific types CpG motifs see CG (CpG) islands CPI, b-Globin gene expression, 451F CPSF (cleavage and polyadenylation specificity factor), 357–358, 357F Cranial sensory ganglia, 1384F CRE (Cyclic AMP response element), 908 Creatine phosphokinase, myoblast specialization, 464 CREB (CRE-binding protein), 908, 908F CREB-binding protein (CBP), 908, 908F C region exons, antibody genes, 1562, 1563FF Cre/Lox system, 567–568, 1348, 1444 Creutzfeldt–Jacob disease (CJD), 397–398 Crick, Francis H.C., 196 Critical period, 1396 Cro repressor, 142, 142F, 421F, 457–458, 458F

mismatch of repair defects,1255, 277, 295T, sequence mutations, 1255F steps in progression, 1250–1252, 1254–1256, 1352F Columnar epithelia, 1133, 1150–1151 Combinatorial control, 425 cell determination, 465–466 cell differentiation, 464–465, 465F complex formation, 447, 447FF Drosophila Eve gene, 448–450, 449F heterodimerization, 424–425, 425F, 425FF promoter integration, 449–450, 450F Combinatorial diversification, antibody chains, 1563 Combinatorial regulation, microRNA (miRNA), 494–495 Combustion, 820F Commissural axon(s), 1388, 1388F Commissureless protein, 1389 Common cold, 1518 Common evolutionary ancestor, 862 Compact bone, 1470F Compaction, 1379, 1379F

cell also differentiation influence, 1468–1470 see Extracellular matrix (ECM) see also Epithelia Connexin-26, 1161 Connexins, 1159–1161, 1160F, 1290 Connexons, 1159–1161, 1160F Consensus sequences polyadenylation signals, 357, 357F promoter elements, 338–339, 338F RNA polymerase start sites, 342F splicing signals, 349, 349F Conservation, evolutionary see Evolutionary conservation Conservative site-specific recombination, 316, 324 gene control mechanism, 325–326 reversible DNA rearrangement, 324, 324F, 325F transgenic applications, 325–326, 326F Conserved synteny, 207, 208F Constant domain, Ig heavy chain, 1559F, 1560F Constitutive secretory pathway, 800, 801F see also Exocytosis Contact-dependent signaling, 881, 881F see also Ephrin(s); Notch receptor protein

see also Lambda repressor Cross-beta filaments, 397, 397F Crossing-over see Homologous recombination (crossing-over) Cross presentation, antigen presentation, 1584 Cross-strand exchange see Holliday junctions Cross-talk, prevention between MAP kinases, 930 Crumbs complex, epithelial apico-basal polarity, 1156, 1157F Cryoelectron microscopy, 610 Cryptdins, 1437 Cryptic splicing signals, 352, 352F, 355, 355F Cryptochrome, 961 Crypts of Langerhans, 1526F Crypts, of small intestine, 1436, 1436F, 1441F Crystallization, proteins, 528 Crystallography electron, 611–612 X-ray see X-ray crystallography CstF (cleavage stimulation f actor F), 357–358, 357F, 482–483 CTCF protein, 470F C-terminal domain (CTD), RNA polymerase II,

Compaction DNAhybridization packaging, 210–211 Comparativeratio, genomic (CGH), tumour cell identification, 1239, 1239F Comparative genomics, 22, 207, 245–260 human vs chimpanzee, 247, 248F human vs mouse, 249F phylogenetic footprinting, 431, 431F phylogenetic tree creation, 247, 247F Compartment(s), 1352–1355, 1352F compartmentalization of cell, 695–704 of imaginal discs, 1352, 1353–1354 intracellular see Intracellular compartments Competition between axons for synaptic territory, 1393–1394, 1394F sexual reproduction and, 1271–1272, 1271F Complementary DNA see cDNA Complementation, 528F Complementation tests, 528F, 558 Complement-binding co-receptor complex, 1596 Complement system, 1542 activation, 1528–1529, 1528F adaptive immunity, 1551–1552, 1596, 1596F C3 activation, 1528 C3b and C3a, 1528–1529 cascade, 1528–1529, 1528F early components, 1528 Ig activation, 1557T late components, 1529F lesions in red blood cells, 1529F membrane attack complex, 1529, 1529F

Contact guidance, 1140, Contact inhibition, 1110, 1387–1388 1110F,, 1233, 1234F 1110F Contractile bundles, 1006–1007, 1007F see also Actin/actin filaments Contractile ring see Cytokinesis Convergent extension, 1368, 1369F Coomassie blue, protein staining, 517, 518F Cooperativity (protein interactions) allosteric transitions, 173–174, 173F, 174F, 174F, 175F see also Allosteric regulation DNA replication fork , 273, 274F, 276 hemoglobin, 256, 256F COPI-coated vesicle(s), 751, 754, 754FF COPII-coated vesicle(s), 751, 754F, 759F, 767, 767F Copia opia element, 318T Copy number variation, 258 genome evolution, 259–260, 259F Co-receptor, T cell, 1580–1581, 1580T, 1581F Corepressor(s), 445, 447F 447F,, 457–458, 458–459, 458F see also Cooperativity (protein interactions) Corn see Maize Corneal tumor, angiogenesis, 1448, 1448F Coronaviruses, 1496F Corral(s), membrane partitioning, 647, 648F Cortical reaction, 1299, 1300, 1300F Corticotropin (ACTH), 803F Cortisol, 463, 889, 889F gene expression regulation, 463 receptor, 891F Costal2 protein, 951 Costimulatory signals

341–342 CTLA4, B7 binding, 1591–1592 CTLA-4 protein, T-cell regulation, 1592T CTX f bacteriophage, 1492F Cubitus interruptus (Ci) protein, 951, 952F Culture, cells see Cell culture Cut-and-paste transposition, 319F, 320F see also DNA-only transposons CXCR4, 1375, 1505–1506, 1505F Cy3 fluorescence, 587, 587F Cy5 fluorescence, 587, 587F Cyanide, cytochrome oxidase binding, 834 Cyanobacteria evolutionary significance, 873–875 photosynthesis, 827F, 840 in tree of life, 16F Cyclic AMP (cAMP), 117F 117F,, 905–909, 906F, 907F, 907T bacterial toxin action, 1503 cyclic-AMP-gated cation channels, 917 gene activation by, 909F regulation, G protein, 905–906 regulation of PKA, 908, 908F synthesis and degradation, 905–906, 907F Cyclic-AMP phosphodiesterases, 906, 907F Cyclic-AMP response element (CRE), 908 Cyclic GMP (cGMP) cyclic-GMP-gated Na+ channel, 917 photoreceptors, 917–918, 917F response to NO, 887, 888F Cyclic-GMP phosphodiesterase, 918


Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



Cyclic-nucleotide-gated ion channels, 916, 917 Cyclic photophosphorylation, 853 Cyclin(s), 1062 APC/C and, 1087 Cdk complexes see Cyclin–Cdk complexes cyclical changes, 1062, 1063 G1-cyclins, 1062 G1/S-cyclins, 1062 gene expression, 1101 M-cyclins, 395, 1062, 1064, 1074, 1087, 1101 S-cyclins, 1062, 1064, 1087 signal integrating device, 177–178, 177F vertebrates, 1063F yeast, 1063F Cyclin–Cdk complexes, 177–178, 177F 177F,, 1062, 1062F 1062F,, 1063F CKI binding, 1063–1064 G1-Cdk, 1062, 1066, 1103–1105 G1/S-Cdk, 1062, 1066, 1103–1105 M-Cdk, 1062, 1066 activation by dephosphorylation, 1074–1075, 1074F entry into mitosis, 1071, 1074 microtubule dynamics and, 1080 spindle assembly role, 1078–1079, 1079F, 1080 mechanism of action, 1062–1063, 1062F S-Cdk, 1062, 1066, 1067–1069, 1068 see also Cyclin(s); Cyclin-dependent kinases (Cdks) Cyclin-dependent kinase-activating kinase (CAK), 1063, 1063F, 1066T Cyclin-dependent kinase inhibitory proteins (CKIs), 1063–1064, 1064F, 1066T, 1101 Cyclin-dependent kinases (Cdks), 1062–1063 activation by dephosphorylation, 75F, 177, 1063,

cleavage furrow, 1093, 1093F contractile ring, 1093F actin and myosin II as force generators,

transfer experiments, 1581F virus-infected cells, 1581F see also CD8 T-cell(s)


see also Actin/actin filaments; Myosin assembly, 1093–1094, 1093F dynamic behavior, 966 RhoA role, 1094–1095, 1095F site of assembly, 1097 midbody, 1094, 1094F mitotic spindle and plane of division in animal cells, 1095–1097 astral relaxation model, 1096–1097, 1096F astral stimulation model, 1096, 1096F central spindle stimulation model, 1096, 1096F, 1097F organelle distribution, 1098 phragmoplast role in higher plants, 1097–1098, 1097F, 1098F plasma membrane enlargement, 805 timing, 1095 see also Mitosis Cytolytic effects, of viruses, 1496 Cytomegalovirus (CMV), MHC class I protein translocation inhibition, 1536 Cytoplasm, 74–75, 75F, 696 division of see Cytokinesis egg (ovum), 1287 strands in plant cells, 782F see also Cytosol; specific components Cytoplasmic bridges, 1290, 1290F, 1294, 1296F Cytoplasmic dyneins, 1014 Cytoplasmic inheritance see Non-Mendelian inheritance Cytoplasmic tyrosine kinases, 935 Cytosine, 116F, 197, 301F


1063F,in1066T, , 1074F cyclical changes activity, 1062 cyclin complexes see Cyclin–Cdk complexes evolution, 177F G2/M checkpoint, 1062 inactivation/inhibition G1 phase, 1100–1101 phosphorylation, 1063–1064, 1064F, 1066T regulation, 177–178, 177F vertebrates, 1062, 1063F yeast, 1062, 1063F see also Serine/threonine kinases; specific kinases Cycloheximide, 384, 385T Cyclostome see Anaphase promoting complex (APC/C) Cys–Cys–His–His zinc finger proteins, 422F Cysteine, 101, 129F Cystic fibrosis, 560, 666, 768 Cystic fibrosis transmembrane conductance regulator protein (CFTR), 666 Cystinuria, 652 Cytochalasin, 988T Cytochrome(s), 829, 831, 832–833, 833F, 852F

base-pairing, 198F C-to-U editing, 484 deamination, 296, 297F, 298F, 301F RNA structure, 332 Cytoskeletal filaments, 647, 648F, 965–1053 assembly/formation drug-induced changes, 987–989, 988T kinetics, 973 nucleation, 973, 978F, 992 rate of subunit addition, 977 self-assembly, 965–991 subunits, 970–971 see also Actin polymerization behavior, 966–969 capping, 1003, 1003F cross-linking, 1001, 1005–1008 dynamic behavior, 965–991, 1002–1003 elongated, 972F, 976 nucleation regulation, 992–1010 organization, 1005–1008 stabilization, 1001–1002 subunit stoichiometries, 1002–1003 see also Actin/actin filaments; Intermediate

Dac (dach (dachsund) sund) gene, 466F Dachsous, planar cell polarity, 1158 Dally/Dally-like genes, 1184, 1184T Dalton, definition, 45 DAN enzyme, 492F DAPI fluorescence, 587F Darkfield microscopy, 583 Databases, 530–531 Dazgene/protein, Daz gene/protein, spermatogenesis regulation, 1295–1296 DCC receptor protein, 1388, 1388F Deadenylation-independent mRNA decay, 492, 492F Deadenylation-mediated mRNA decay, 492, 492F Deafness, connexin-26 mutations, 1161 Deamination, 296, 297F, 301F DNA methylation role, 300–301, 301F hypoxanthine production, 300, 301F inosine production, 369, 369F, 484, 484F 5-methylcytosine, 470 mutagenesis mechanism, 298F, 300–301 Death (of cells) see Cell death Death inducing signaling complex (DISC), apoptosis, 1120, 1120F Death receptor(s), apoptosis, 1120–1121, 1120F Decapentapl Decap entaplegic egic (Dpp) gene, 1335 Decapentaplegic protein (Dpp), 1335, 1335F 1335F,, 1353, 1353F Decapping, 492 Decorin, 1181–1182, 1182F, 1184T Default pathway, 800, 801F see also Exocytosis Defensins, 1525–1526, 1533 Degradation signals, protein(s), 396F Dehydrogenation reactions, 71F, 72 Delayed K+ channel(s), 689 Deletion cassettes, yeast mutagenesis, 570 Deletions, chromosomal see Chromosome deletion d chain, T-cell receptor, 1571 Delta G (DG) see Free energy change Delta G (DG) Delta–Notch signaling see Notch signaling pathway Delta protein C. elegans early embryo, 1324 Drosophila sensory bristle development, 1359 lateral inhibition, 946–947, 947F, 1358FF see also Notch receptor protein; Notch signaling pathway Denaturation, protein, 130 Dendrite(s), 1047, 1050F, 1386–1387, 1387F microtubule orientation, 1049 neuronal computation, 688F neurosignaling, 675

see also individual cytochromes Cytochrome b6-f complex, photosystem II, 851, 852F Cytochrome b562, structure, 137F Cytochrome b-c1 complex, 832, 833F proton pumping, 835 Q-cycle, 835–836 structure, 836F Cytochrome c, 833F apoptosis, 1118, 1121, 1121F, 1122F mutation rate, 265 structure, 144F Cytochrome oxidase complex, 832, 833F essential nature, 834 iron–copper center, 834 mammalian, 834 oxygen reduction, 832–834, 833F poisoning, 834 structure, 833F, 834, 834F Cytochrome P-450 oxidase, carcinogen activation, 1225 Cytogenetics, 202–203, 203F, 203FF, 204F Cytokine(s) antagonists, viral-encoded, 1534 dendritic cells, 1413F 1413F,, 1592–1593 inflammatory response, 1533–1534 T cells, 1582 see also Interleukin(s); specific molecules Cytokinesis, 1054, 1055, 1055F, 1073F, 1092–1101, 1093F asymmetric, 1099, 1099F

Microtubule(s) Cytoskeleton,filament(s); 26, 965–1053 , 965F cell junction attachment, 1131, 1142, 1142F cellular polarity, 969, 1044 function, 965 helical filaments, 143, 145 influencing cell behavior, 1025–1050 integrin attachment, 1170, 1170F intracellular anchor proteins, 1142 motor proteins see Motor protein(s) pathogen utilization, 1514–1517 properties, 965 Rho proteins, 1041–1043 RNA localization, 1022–1023 spectrin (membrane cytoskeleton), 646, 647F stability, 969 see also Actin/actin filaments; Cytoskeletal filaments; Intermediate filament(s); Microtubule(s); specific components Cytosol, 696 pH regulation, 657–658, 661–662 volume, 697T Cytotoxic T-cells T-cells ( TC), 1535, 1560–1561, 1572–1573, 1581–1582 activation, helper T-cells (T H), 1574–1575 antigen presentation, 1581–1582, 1583F helper T-cells vs., 1584 CD8 co-receptor role, 1580–1581, 1581F, 1586 cell killing mechanism, 1572–1573, 1573F interferon-geffects, 1592 selection in thymus, 1585–1586, 1587F

Dendritic cells,1571, 1533,1590–1591 1542, 1571–1572, 1571F activation, cell–cell adhesion molecules, 1571 co-stimulatory proteins, 1571 distribution, 1571 functions, 1542, 1542F 1542F,, 1593F, 1594 maturation, 1571 MHC expression, 1571, 1590 NOD proteins, 1536 nonactivated, 1571 pattern recognition receptors, 1536, 1571 phagocytosis, 787, 1452 self-reactive T-cell elimination, 1591 Toll-like receptors (TLR), 1531, 1536 De novo DNA methyltransferases, DNA methylation, 467 Dense-core vesicles see Secretory vesicle(s) Density gradient centrifugation, 511, 512F, 522 Deoxyribonucleic acid see DNA Deoxyribonucleoside triphosphates (dNTPs), 266, 268F Deoxyribose, 116F, 332F Dephosphorylation, 176, 176F see also Protein phosphatase(s) Depth of field, electron microscopy, 606, 608 Depurination, 296, 297–298, 297F, 298F, 298F, 299F Dermal papillae, 1422F Dermatan sulfate, 1179 Dermis, 1418, 1418F, 1477 Desensitization see Adaptation Desert Hedgehog protein, 950




Desmin, 985T, 987 Desmocollins, 1136, 1138T Desmogelins, 1136, 1138T Desmosome(s), 1134, 1134F 1134F,, 1135T, 1143–1144, 1144F, 1177T keratin filaments, 986 Desmotubule, 1162 Detergent(s), 517, 517F, 638F, 639F ionic vs. nonionic, 636 membrane protein solubility, 636–640 see also specific detergents Determination see Cell determination Detoxification reaction(s), smooth endoplasmic reticulum, 725 Development, 1305–1320 asymmetric cell division, 1099, 1289–1290, 1289F, 1313–1315, 1314F C. elegans see Caenor Caenorhabdi habditis tis elegans elegans development cell determination, 1311–1312, 1312F cell fate, 1311–1312 cell lineage tracing, 1310–1311, 1311F cell memory, 1305, 1312, 1315 cell migration, 1140, 1140F cleavage of egg, 1307 descriptive embryology, 1310 Drosophila Drosop hila melanogaster melanogaster see Drosop Drosophila hila development epithelial folding, 1142, 1143F epithelial–mesenchymal transitions, 1141 evolutionary conservation among animals, 1306F, 1307 experimental embryology, 1310, 1310F four essential processes, 1305, 1306F gap junctions, 1161 genetics see Developmental genetics and gene

Differential-interference microscopy, 583 see also Phase-contrast microscopy Differentiation of cells see Cell differentiation Diffraction patterns, 528, 528F Diffusion-limited enzyme catalysis, 163, 163T, 169 Diffusion, random nature, 74, 75F Digestion, 88, 1436 see also Lysosome(s) Dihydrofolate reductase, cancer treatment, 1260 Dihydrouridine, tRNA modification, 368F, 369F Dihydroxyacetone, 112F Dihydroxyacetone phosphate, 120F Dimer formation DNA damage, 296, 298F proteins, 142F see also DNA-binding proteins Dimethylbenz[a]anthracene (DMBA), 1226, 1238 2, 4-Dinitrophenol, 836 Dinitrophenyl, 1545, 1545F Diploid cells classical genetics, 554F sexual reproduction, 1269, 1270F see also Meiosis yeast life cycle, 34, 34F Diplotene, 1275–1276, 1280, 1288 Dipoles, covalent bonds, 50 Disaccharides, 56, 57F, 113F Discs large (D lg) protein, 1148–1149, 1148F, 1154 Dishevelledgene/protein, Dishevelled gene/protein, planar cell polarity, 1158, 1359 Disintegrins, 1193 Dislocation, proteins see Retrotranslocation, misfolded proteins Dissociation constant (K (Kd), 158F Dissociation rate, 158F, 526 Distal-less gene, 1351, 1351F, 1355

see also DNA repair manipulation see Recombinant DNA technology noncoding see Noncoding DNA packaging, 202–218, 202–219 chromatin packing, 243, 244F see also Chromatin; Nucleosome(s) compaction, 210–211 see also Chromosome(s); Chromosome structure polarity, 3F protein interactions see Protein–DNA interactions recombination see Recombination regulatory see Regulatory DNA repair see DNA repair repeats see Repetitive DNA replication see DNA replication structure see DNA structure synthesis see DNA synthesis telomeric, 210 see alsoTelomere(s) alsoTelomere(s) templated polymerization, 3–4, 3F thermal stability, 296 unwinding replication, 273, 273F transcription, 333 see also also entri entries es beginning beginning DNA DNA array(s) see DNA microarray(s) DNA bending nucleosome–DNA interactions, 214F proteins, enhancesome formation, 446, 447F see also DNA-binding proteins DNA-binding dyes, cell cycle analysis, 1059 DNA-binding motifs (proteins), 416–454 b sheet motif, 422, 423F DNA-binding homeodomains, paired domains,

germ layersregulation and gastrulation, 1307, 1307F inductive interactions and signals, 1310, 1313, 1313F, 1316T lateral inhibition, 1314, 1315F mitosis in absence of cytokinesis, 1099–1100 model organisms, 1311 morphogens and gradients, 1316–1317, 1318F mouse see Mouse development nervous system, 1383–1397 see also Neuron(s),development plants see Plant development and growth positional controls, 1111 positional values, 1312–1313, 1312F, 1313F regulatory DNA defines program, 1309, 1309–1310, 1309F sequential induction, 1319, 1320F timekeeping, 1319–1320, 1320F total cell mass, 1111 vertebrates see Vertebrate development Xenopus laevis see Xenopus laevis development see also Embryo(s)/embryogenesis; Signaling molecule(s)/pathway(s); individual

Disulfide amino bonds acids, 129F, 147–148 electrophoresis, 518F protein stability, 147–148, 147F Diurnal rhythms, 460–462, 461F see also Circadian clocks Divergence (evolutionary) mutation rate analysis, 264 phylogenetics, 247, 247F, 248F see also Gene duplication(s) “Diverse animalcules,” animalcules,” Leeuwenhoek, Anton van, 501F Divisional asymmetry, in stem cell production, 1421, 1421F DMBA (dimethylbenz[a]anthracene), as mutagenic chemical carcinogen, 1226, 1238 DNA (deoxyribonucleic acid), 3, 3F amplification via PCR see Polymerase chain reaction (PCR) analysis, 532–553 bending see DNA bending catenation, 1071 cell macromolecule, 62F

141 proteins, 418–419, 418T gene regulatory helix-loop-helix motif, 425–426, 426F helix-turn-helix motif, 419–420 homeodomain, 420–421, 421F see also Homeodomain proteins recognition helix, 419, 420F structure, 419, 420F leucine zipper motif, 423, 424F protein–DNA interaction, 417, 418–419 base-pair recognition, 417, 417F see also DNA structure zinc finger motifs, 421–422, 422F, 423F see also Protein–DNA interactions DNA-binding proteins, 427F binding site prediction, 426 dimerization, 420, 420F, 422 Cro repressor, 142, 142F functional role, 423 heterodimerization, 424–425, 425FF homodimerization, 424, 425F DNA-binding motifs see DNA-binding motifs DNA structure relationship, 416–417, 417F, 419

organisms and processes Developmental genetics and gene regulation, 450–451, 451F, 1308, 1309 cell differentiation, 464–465, 465F combinatorial gene control, 464–4695, 465F Drosophila Drosop hila see under under Drosop Drosophila hila development genes specially required, 1308 genetic screens, 1308 organ formation, 465–466, 466F regulatory DNA defines program, 1309, 1309–1310, 1309F transcriptional synergy, 464 see also Cell differentiation; specific genes Diabetes mellitus type 1, 1549 Diacylglycerol, 910 Diakinesis, 1275, 1276 Diapedesis see Lymphocyte(s),recirculation Diarrhea bloody, in dysentery, 1491 enteropathogenic E. coli, 1504 Salmonella enterica spread, 1518 spread of infection, 1487–1488 Dicer protein, RNA interference (RNAi), 496 Dickkopf protein, 1316T Dictyostelium, 16F chemotaxis, 1045 myosin I and II localization in crawling amoeba, 1041, 1041F Dideoxy DNA sequencing, 549–550 Didinium, 28F Dietary requirements, nitrogen, 101

chemical synthesis, 548 chromatography, DNA-binding proteins, 428–429, 429F cloning see DNA cloning compaction, 210–211 complementary see cDNA damage see DNA damage fingerprinting, 546, 547F helix-passing reaction, DNA topoisomerase II, 281F historical research, 195–196, 195–197, 329 identification as genetic material, 195–196, 196F, 197, 198F Streptococcus pneumoniae experiments, 196F, 198F structure elucidation, 195–196, 196, 197, 329 hybridization see DNA hybridization information coding, 199–200, 329, 330F, 331 DNA makes RNA makes protein, 331, 331F relation to proteins, 199–200, 199F as universal information store, 2, 297, 408 see also DNA sequence; Genetic code; Genome(s) labeling, 534 linker, 211 location, 200–201, 201F see also Nucleus maintenance, 263–265 failure, 263, 265, 1212 see also Cancer; DNA damage; Mutation(s) genome evolution, 246–247

see also DNA structure helix-turn-helix proteins, 420–421, 420F homeodomain proteins see Homeodomain proteins histones see Histone(s) leucine zipper proteins, 423, 424F, 425F major groove-binding, 423, 424F minor groove-binding, 423, 424F sequence-specific, 430F affinity chromatography, 428–429, 429F chromatin immunoprecipitation, 432, 432F DNA sequence determination, 429–431, 430F gel-mobility shift assay, 427–428, 428F zinc finger interactions, 427F SSBs see Single-strand DNA-binding proteins (SSBs) zinc finger proteins, 421–422, 422F, 423F see also DNA replication; Gene regulatory protein(s); Protein–DNA interactions DnaB protein, 283F DNA catenation, 1071 DNA cloning, 532, 540–541 cloning vectors, 540–541, 541FF, 542F genomic library production, 540–541, 542F ligation reaction, 540, 541F restriction fragments, 540 reverse genetics, 575 see also cDNA; DNA libraries DnaC protein, 283F DNA crosslinks, 295T, 296, 297F DNA damage, 296, 296F, 297F

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



agents causing see DNA-damaging agents apoptosis, 1106, 1117 ATM/ATR ATM/A TR signaling pathway, 1105 bulky lesions, 298 cancer and, 1216–1217, 1225, 1246 see also Carcinogens; Mutation(s) cell cycle and, 303–304 checkpoints, 303, 1105–1107, 1106F cross-linking, 296, 297F failure to repair, 1106 see also Cancer; Mutation(s) repair see DNA repair replication, 296, 298F see also Mutation(s) spontaneous alterations, 296, 296F see also speci specific fic types see also DNA repair DNA-damaging agents carcinogens see Carcinogens ionizing radiation, 300–301 see also Ultraviolet (UV) radiation sensitivity, DNA repair defects, 295T see also Mutagenesis DNA–DNA interactions, 306F hybridization see DNA hybridization DNA duplication(s) chromosomes see Chromosome duplication exon recombination, 257 genes see Gene duplication(s) genome evolution, 246–247 whole genome, 38–39, 39F, 255 DNA excision, site-specific recombination, 323, 324, 324F DNA fingerprinting, 546, 547F DNA footprinting, 429–431, 430F DNA glycosylases, 297–298

strand-directed mismatch repair, 277–278, 277F, 284F uncontrolled, 296F DNA methyltransferase(s), 284F, 467 DNA microarray(s), 574 cell cycle analysis, 1065 gene expression analysis, 537, 574–575 cancer cell typing, 414F 414F,, 1240, 1249, 1264 cluster analysis, 575, 575F human genes, 412 metastases, 1249 methodology, 574, 574F replication fork analysis, 285, 286F sizes, 574 DNA mismatch repair see Mismatch repair DNA-only transposons, 318F, 318T, 318T, 323 cut-and-paste transposition, 318T, 319F, 319F, 320F DNA polymerase(s), 266 5¢-3¢ chain elongation, 267, 268F catalytic mechanism, 267F 267F,, 268F cooperativity, 275–276 DNA repair, 302 dNTP substrates, 266, 267F, 268F eucaryotic, 280, 281F, 293F, 294F, 295T fidelity, 269 movement along DNA, 273–274 proofreading, 269–270, 270F see also Mismatch repair RNA polymerases vs., 334, 335 sliding clamp, 274–275, 275–276, 275F, 276F structure, 268F T7 polymerase, 269 thermophilic, 544 see also Polymerase chain reaction (PCR) viral, 1517 see also speci specific fic enzymes

seeTelomere(s) chromosome ends see Telomere(s) initiation see DNA replication initiation multiple replication forks, 283, 284F under Replication fork replication forks see underReplication under Replication replication origins see underReplication origin(s) replication rate, 283 S phase of cell cycle, 284, 285, 285F 285F,, 1067–1069, 1068F timing, 285 see also Cell cycle fidelity, 269–270, 271FT see also DNA repair historical research, 266–267 incorrect model of DNA replication, 269F initiation see DNA replication initiation machinery, 266–281, 276F cooperativity, 275–276 DNA helicases, 273, 273F 273F,, 274F DNA ligase, 272, 273F DNA polymerase see DNA polymerase(s) DNA primase, 272, 272F, 273, 276F DNA topoisomerases, 278–280, 279F, 280F primosome, 276 single-strand DNA-binding proteins, 273, 274F, 275F mitochondrial, 856–857, 857F nucleosome assembly, 289–290 origins see Replication origin(s) phylogenetic conservation, 280 proofreading, 269–270, 270FF replication fork see Replication fork replication origins see Replication origin(s) semiconservative nature, 266, 266F, 268F strand recognition, 277 methylation in procaryotes see DNA

mechanism, 299F recognition of DNA damage, 300–301, 300F DnaG protein, 283F DNA helicase(s), 273, 274F assay, 273F defects, 295T DnaB protein, 283F inhibition, DnaC protein, 283F mechanism of action, 273, 282, 283F TFIIH transcription factors, 340–341 DNA-helix-passing reaction, DNA topoisomerase II, 281F DNA hybridization, 306 chromosome paints, 202–203 DNA–RNA hybridization, 535–537, 538F Northern blotting, 538–539, 539F helix nucleation, 306F hybridization conditions, 535–536, 537F model of recombinational base-pairing, 306F nonpairing interactions, 306F recombinant DNA technology, 532 Southern blotting, 539–540, 539F see also DNA probe(s)

DNA primases, 272,283F 272F,, 273, 276F 272F bacterial dnaG, eucaryotic, 280 mechanism of action, 282, 283F DNA probe(s), 534, 536F nucleic acid detection, 539–540, 539F see also DNA hybridization DNA–protein interactions see Protein–DNA interactions DNA rearrangement(s) bacterial phase variation, 454–455, 455F conservative site-specific recombination heritable, 325–326 reversible, 324, 324F see also Recombination; specific rearrangements DNA recombination see Recombination DNA renaturation see DNA hybridization DNA repair, 263, 295–304 base excision repair (BER), 297–298, 299F cell-cycle delay, 303–304 cross-link repair, 295T defects in see DNA repair disorders direct chemical reversal, 298

methylation278, 278F nicks in eucaryotes, see also Single-strand DNA breaks see also Mismatch repair transcription vs., 333–334 “winding problem,” 278F see also Chromosome replication; individual components DNA replication initiation, 281–282 bacterial chromosomes, 282, 283FF, 284F eucaryotic, 289F, 1067, 1068F preinitiation complex, 1067 prereplication complex, 1067–1068, 1068F ORC (origin recognition complex), 287 origins see Replication origin(s) origins of replication see Replication origin(s) proteins, 281, 282, 283F 283F,, 1067 regulation, 282 DNA–RNA hybridization, 536–537, 538F see also RNA–DNA hybrids DNA segment shuffling, 19, 19F DNA sequence, 199–200 alterations in genome evolution, 246–247

DNA labels, 534 DNA libraries, 540–542, 541–542 cDNA, 542, 543F, 544 genomic, 542, 542F cDNA vs., 543F, 544 in yeast two-hybrid system, 524 see also DNA cloning DNA ligase(s) DNA cloning, 540–541, 541F DNA repair, 295T, 302–303 Lagging strand DNA synthesis, 272 reaction mechanism, 273F DNA looping, 437F 437F,, 438F transcription regulation, 438, 438F, 480–481 DNA melting, 537F DNA methylase(s) see DNA methyltransferase(s) DNA methylation, 472F cancer cells, 1213 CG (CpG) islands, 434, 470–471 damage recognition, 300–301 enzymes, 284F, 467 eucaryotes, 278 gene expression and, 467–468, 468F genomic imprinting, 468–470 inheritance, 467–468, 467F methylated DNA binding proteins, 468 5-methylcytosine, 467, 467F procaryotes, 277–278, 282, 284F restriction–modification systems, 532 recognition functions, 277–278, 532 role in mutation, 300–301, 301F

DNA polymerases, 302 DNA structure importance, 297 double-strand breaks, 295T, 302–303, 303F enzymes, 296, 299F error prone, 310–311 failure see Mutagenesis homologous recombination, 295T, 305 identification, 295 importance, 295 mismatch repair see Mismatch repair multiple pathways, 295, 297–298 nucleotide excision repair (NER), 295T, 298, 299F RNA polymerase coupling, 299–300 transcription coupling, 299–300 translesion synthesis, 295T see also DNA damage; individual repair pathways DNA repair disorders, 277, 295–296, 295T, 304, 1106 see also Cancer; specific disorders DNA repeats see Repetitive DNA DNA replication, 3, 200, 201F, 263, 266–295 analysis techniques, 282–283, 284F 284F,, 285, 285F bacterial, 280, 282, 283F end-replication, 292 DNA catenation, 1071 DNA synthesis see DNA synthesis DNA templating, 200, 201F 201F,, 266 end-replication problem, 292 errors, 246–247, 269, 271–272, 276–277 see also DNA damage; Mutation(s) eucaryotic, 280 chromatin effects, 285–286

analysis techniques see DNA sequencing bacterial, as immunostimulant, 1527 evolutionary conservation, 207, 208F 208F,, 250 human b-globin gene, 199F, 200F recognition, 418–419, 418T see also DNA-binding motifs structural effects, 416–417 DNA sequencing, 548–550 alignment, 530–531 automation, 550, 550F chain-terminating nucleotides, 550 gel electrophoresis, 534, 535F genomic see Genome sequencing historical aspects, 549–550 human genome, 142, 205–206 comparative, 207, 247, 247F, 248F intron–exon recognition, 551 open reading frame prediction, 551 protein sequence prediction, 139, 550–551, 550F recombinant DNA technology, 532, 534, 535F DNA structure, 62F 62F,, 195–201, 197–201 backbone (sugar–phosphate), 197, 198–199, 198F base-pairing, 197–199, 198F, 417F complementary chains (strands), 197–199, 266F antiparallel nature, 198F, 199, 267 role in repair, 297 role in replication, 200, 200F, 201F, 266 deformation, coupled to packaging, 213, 214F double helix, 197–199, 198F, 199F, 199F, 338F complementary chains (strands) see DNA


replication hydrogen bonds, 197–198, 198F, 199F, 199F, 417 major groove, 199F, 416F minor groove, 199F, 416F repair, 296–297 see also DNA repair rotation, 278, 278F strand separation, 273 turns, 198–199, 199 elucidation, 195–196, 196, 197 hairpin helices, 273 mechanism for heredity, 199–200 see also Gene(s) nucleotides, 62, 197–199, 198F see also Nucleotide(s) phosphodiester bonds, 199F polarity, 198F 3¢ to 5¢ polarity, 197 protein–DNA interactions, 416–417, 417F see also DNA-binding motifs (proteins) RNA vs., 408 sequence effects, 416–417 see also DNA bending X-ray diffraction analysis, 195–196, 196 see also DNA topology DNA supercoiling see Supercoiling DNA synthesis, 266–268 analysis autoradiography, 282–283, 284F, 602–603 BrdU staining, 285, 285F 285F,, 1059, 1059F, 1422, 1425 ATP requirement, 86, 87F chemistry, 268F 5¢-3¢ chain elong ation, 266–267, 267F, 268F, 271–272, 271F deoxyribonucleoside triphosphates, 266, 267F, 268F 266–268 DNA replication, 5¢-3¢ chain elongation (leading strand), 267, 267F, 268, 268F, 271–273, 271F, 276F lagging strand see Lagging strand synthesis (DNA replication) primer strand, 267F, 268F pyrophosphate release, 267F, 268F template strand, 267F, 268F see also DNA polymerase; DNA synthesis initiation, 281 mechanism, 268F see also DNA polymerase(s) relation to histone synthesis, 289–290 see also DNA replication DNA topoisomerases, 278 catalytic reaction, 279F DNA replication role, 278–280 see also DNA replication lambda integrase vs., 324 mechanisms of ac tion, 278–279, 279F, 280F topoisomerase I, 278, 279F topoisomerase II, 278–279, 280F, 281F DNA topology supercoiling see Supercoiling transcription elongation, 343–345, 344F see also Nucleosome(s) DNA transfer see Horizontal gene transfer DNA tumor virus(es), 1247–1249, 1248F DNA virus(es), 1496F 1496F,, 1497F in cancer, 1227–1228, 1228T see also DNA tumor virus(es) dNTPs see Deoxyribonucleoside triphosphates (dNTPs) Docking proteins, insulin receptor substrate (IRS-1), 924 Dolichol phosphate, 115F Dolichol, protein glycoslation, 737, 738F, 747F Dolly the sheep, 1287 Domain fusion, activator proteins, 442F Domains, living world, 16, 16F Dominant negative mutation(s), 528F, 564F antisense RNA, 564F genetic engineering, 564 RNA interference, 564F Dopamine, gap junction permeability regulation, 1162, 1162F Dormancy, Epstein–Barr virus (EBV), 1499 Dorsal lip, of blastopore, 1367–1368, 1367F Dorsal protein, of Drosophila, 1334–1335, 1335F Dosage compensation, 473, 475–476, 476F Double bonds, carbon–carbon, 106F Double-checking, DNA polymerase proofreading, 269

Doublesex Doubles ex (Dsx) gene, Drosophila sex determination, 481F, 482F Double-strand breaks (DSBs) homologous pairing/meiotic recombination, 305F, 312, 1275, 1280 production, 300–301 repair, 302–303, 303F, 304–305, 308–309 defects, 295T see also Homologous recombination (crossing-over) topoisomerase II production, 280F Double-stranded RNA (dsRNA), viruses, 1534 Down syndrome, meiotic nondisjunction, 1278–1279 Dpp (decapentaplegic) gene/protein, 1335, 1353, 1353F, 1355 Drk gene, 928F Drosophila development, 1328–1341 anteroposterior patterning, 1341–1347 see also Drosop Drosophila hila melanogaster melanogasterhomeotic homeotic genes cell cycle analysis, 1058 cellularization, 1099, 1100F early embryo and genesis of body plan, 1328–1341 blastoderm, 1330–1331, 1330FF body axis specif ication, 1332F, 1333–1334, 1334F dorsoventral patterning, 1334–1337, 1335F 1335F,, 1335FF egg, 1330, 1331F egg polarity genes see Egg polarity genes (Drosophila) fate map, 1331F, 1332F follicle providing egg-polarizing signals, 1333F gastrulation and mesoderm formation, 1335, 1336F, 1340 morphogen gradients, 1333–1334, 1334FF 1334FF,, 1335F, 1335FF, 1336 mRNA localization, 487, 488F, 1333–1334, 1334F oocyte, 1333F planar cell polarity, 1157, 1157F regulatory hierarchy, genes, 1338F Drosophila hila segmentation genes see Drosop melanogastersegmentation melanogaster segmentation genes sex determination, 1286 syncytial to cellular transition, 1330–1331 syncytium formation, 1099, 1100F synopsis, 1329F vertebrate body plan vs., 1336F genetic control/gene regulation, 408–409, 447–450, 448F, 449F, 449FF Even-skipp Evenskipped ed see Eve (Even (Even-skipp -skipped) ed) gene Eygene, Ey gene, 466, 466F Drosophila hila melanogaster homeotic genes see Drosop homeotic genes Ras role in eye development, 927, 927F Drosophila ila segmentation genes see Drosoph melanogastersegmentation melanogaster segmentation genes see also speci specific fic genes genetic model, 1329 genetic screening for early patterning, 1332 genetic techniques, 1329 imaginal discs, 1331 see also underImaginal under Imaginal discs key to developmental mechanisms in other animals, 38 oogonia formation, 1290, 1290F organogenesis and patterning of appendages, 1347–1362, 1347–1363 compartment boundaries as signaling centers, 1353–1355, 1353F compartments, 1352–1355, 1352FF, 1353F eye development, 466, 466F imaginal discs, 1349–1351, 1350F, 1356–1357 individuality specified by homeotic selector genes, 1351 intercalary regeneration, 1354, 1354F size regulation, 1353–1354 parasegments vs. segments, 1330, 1330F sex determination, 481–482, 481F, 482F Drosophila melanogaster adult anatomy, 1328–1330, 1328F apoptosis, 1125, 1126 chromosomes, 237F chromosome 2, 330F gene-chromosome relationship (proof), 37–38, 38F


polytene see Polytene chromosome(s) sex chromosomes, 481 circadian clock, 461–462, 462F cytoskeleton, 967, 967F, 983 Drosophila hila development development see Drosop gene expression alternative splicing, 479 chromosome puffs, 220–222 dosage compensation, 475 gene regulatory proteins, 418T, 447, 448F, 1400T position effects, 221–222, 221F gene regulatory proteins, 1400T genome information coding, 329, 330F mobile genetic elements, 318T, 480, 556 sequencing, 551, 552 size, 18T see also chromo chromosomes somes (above) (above) homeodomain proteins, 429 see also Homeodomain proteins as model organism, 37–38 mRNA localization, 1022–1023 multicellular development and, 447–450, 448F, 449F, 449FF, 465–466, 466F oocyte, 1022–1023 photoreceptor assembly, 927F protein interaction maps, 188 RNA interference (RNAi), 571 vertebrate homologies, 1306, 1306F 1306F,, 1308 wing hair mutants, 1157–1158, 1157F Drosophila melanogasterhomeotic melanogaster homeotic genes, 1341–1347

bithorax and Antennapedia complexes, 1342, 1342F Hox complex, 1342–1347 see also Hox complex; Hox genes memory mechanism, 1344 modulated repetition strategy, 1341–1342 mutations, 1342 Polycomb and Trithorax group genes, 1344, 1345F positional values, 1344 sequential Hox gene expression, 1343–1344, 1343F vertebrate homologies, 1344–1347, 1346F, 1346FF see also speci specific fic genes Drosophila melanogastersegmentation melanogaster segmentation genes, 1336–1338, 1337F, 1338F gap genes, 1333, 1337–1338, 1337F, 1337F, 1338F pair-rule genes, 1333, 1337–1338, 1337F regulatory DNA controlling pattern (eve (eve gene), 447–450, 448F, 449F, 449FF, 1339–1340, 1339F, 1340F segment polarity genes, 1333, 1338F, 1339 see also indiv individual idual genes Drug-induced changes, cytoskeletal filament polymerization, 987–989, 988T Drug resistance, 1521–1524 Dscam gene, alternative splicing, 479F Dynamic instability, cytoskeletal filaments, 980, 981F, 982F catastrophe, 980, 1003 catastrophe vs. rescue, 1080 of microtubules see Microtubule(s) nucleotide hydrolysis, 979F rescue, 980, 981F Dynamin protein, 756F, 757–758, 758F Dynein(s), 1014–1015, 1015F, 1018, 1019F ATP hydrolysis, 1019 attachment to membrane-enclosed organelles, 1022, 1022F axonemal, 1015 ciliary beating and left-right asymmetry, 1377 cytoplasmic, 1014 force generation, 1018 linker region, 1019 mechanochemical cycle, 1019 mitotic spindles, 1077, 1077F 1077F,, 1079 power stroke, 1019, 1019F Dysentery, epidemic, 1491 Dyskeratosis congenita, 294 Dystrophin, 1466

E E2F proteins, 1103–1105, 1244F E6 viral oncogene/protein, 1248, 1249F

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



E7viral E7 viral oncogene/protein, 1248, 1249F Ear, embryonic origin, 1384F 1384F,, 1429 Early cell plate, 1098 Early genes, chromatin condensation effect, 285–286 Eastern equine encephalitis virus, 1496F Ebola virus, cell entry, multivesicular bodies, 797 E-cadherin, 1136, 1138T in cancer invasiveness, 1249–1250 epithelial–mesenchymal transitions, 1141 E. coli coli see Escher Escherichia ichia coli Ectoderm, 1307, 1365 Edema, 1493 Edema toxin, 1493 Edge effects, 582F EDTA, EDT A, cell separation techniques, 502 EF-1 elongation factor, 377F EF-2 elongation factor, 377F Effector B cells, 1543, 1546, 1546F, 1552F Effector T cells, 1543, 1544F, 1546, 1546F, 1552F Efflux transporter proteins, auxin transport, 959 EF-G elongation factor, 377, 377F EF-Tu EF-T u elongation factor, 181, 181F conformational change, 180–181, 181F 181F,, 377 GTP-binding protein, 180–181, 181F 181F,, 377 protein synthesis, 180, 377–378, 377F EGF see Epidermal growth factor (EGF) Egg (ovum), 1287–1292 activation, 1287, 1298 Ca2+ increases, 1299 cortical granules, 1288 cortical reaction, 1299, 1300, 1300F sperm binding to, 1270F, 1270F, 1298–1299, 1298F, 1300F see also Fertilization C. elegans, 1323–1324

Electron microscopy, 604–613 3-D reconstruction, 606, 607F, 611–612 EM-tomography, 611F, 612, 612F autoradiography, 603F chromosome puffs, 239 contrast generation, 606, 610 colloidal gold, 606, 607F heavy metal stains, 606 metal shadowing, 608–609, 610F negative staining, 610, 611F cryoelectron microscopy, 610 depth of field, 606, 608 electron lens, 604 electron scattering, 605 freeze-etch, 610F grids, 605, 605F history, 604T imaging, 610–612 immunogold, 606–607, 607F microscope, 604 molecular localization, 606–607 resolution, 604–605, 604F, 608 sample preparation, 605–606, 605F scanning electron microscopy (SEM), 607–608, 608F, 609F SEM see Scanning electron microscopy (SEM) single-particle reconstruction, 611, 612F, 613F surface analysis, 607–609, 608F, 609F tomography, 611F, 612, 612F, 613F seeTransmission transmission see Transmission electron microscopy (TEM) Electron-motive force, 814, 815F Electron scattering, electron microscopy, 605 Electron stains, 606, 607F Electron transfer, 71–72, 100F, 813, 814F energetics, 820–821, 829, 830F

cell crawling, 1036 cell cycle analysis, 1057–1058, 1057F, 1058F descriptive embryology, 1310 dissociation experiments, 1139–1140, 1139F 1139F,, 1140F experimental embryology, 1310, 1310F G1 phase of cell cycle, 1100 gastrulation, 1364–1369 plant, 1400, 1401F, 1402, 1402F polarity, 1364 stem cells see Embryonic stem (ES) cells see also Development; individual species; specific stages Embryonic germ cells, 1283 Embryonic stem (ES) cells, 505–507, 1283 control of differentiation by different factors, 1481F derivation, 505–507, 506F differentiated cell production in vitro, 1481 drug discovery, 1482 immune rejection problem, 1481–1482 mouse, 567F, 1480 “personalized,” 1303, 1303F, 1481–1482 “therapeutic cloning,” 507 in tissue repair, 1481–1482 Encephalitis, viral, 1502

1288–1290 , 1289F, 1291F development oocytes seestages, Oocytes PGCs see Primordial germ cells (PGCs) timing, 1288 enucleation, 411, 413F parthenogenesis, 1287 size, 1287, 1287F 1287F,, 1290–1291, 1290F specialized cell struc ture, 288F, 288F, 1287–1288, 1291F, 1298F totipotency, 1282 Egg polarity genes (Drosophila),1332–1335, 1332F, 1334F Ehlers–Danlos syndrome, 1187 eIFs (eucaryotic initiation factors), 380F eIF-2, 488–489, 490F, 1535 eIF4E, 380, 491 eIF4G, 380 regulation by phosphorylation, 488–489, 490–491, 490F see also Cap-binding complex (CBC) Elastase, 138F Elastic fibers, 146F 146F,, 1189–1191, 1190F Elastin, 1179, 1189–1191, 1191F

see also ATPvs. (adenosine triphosphate) mitochondria chloroplasts, 814, 815F NADH/NADPH carriers, 82–83, 82F 82F,, 818–819, 818F see also Activated carriers in metabolism oxidative phosphorylation, 100, 819, 819F photochemical reaction centers, 848, 850F, 852F protons, 827–828, 828F redox potentials, 829, 831, 835, 835F, 852F, 852F, 853 see also Electron transport chain(s); Oxidative phosphorylation Electron transport chain(s), 827–840 ATP synthesis, 100, 100F, 817–819, 819F proton gradients, 821–823, 821F proton movement, 828, 828F, 829F uncoupling, 836 see also ATP synthase; Electrochemical proton gradients; Proton pumps bacterial, 839–840, 839F, 8734F evolutionary implications, 871–872 chloroplasts see Photosynthetic electron transport chain(s) cyanobacteria, 872, 873–875

Endochondral Endocrine cells,bone 882 formation, 1470 gut (enteroendocrine cells), 1437, 1437F in respiratory epithelium, 1435 Endocrine signaling, 882–883, 882F, 883F Endocytic–exocytic cycle, 789 Endocytic pathway, 749, 750F, 751F, 795F Endocytosis, 749, 787–799 early endosomes, 782, 792 fluid-phase, 789 late endosomes, 782 LDLs, 791–792, 791F, 793F receptor-mediated see Receptor-mediated endocytosis signal, 793 see also Endocytic pathway Endoderm, 1307, 1365 Endoglycosidase H (Endo H), oligosaccharide processing, 775F Endo H-resistant oligosaccharides, 775F Endoplasmic reticulum (ER), 723–745 antibody synthesis, 768F antigen processing/presentation, 1583F

structure, 146–147, 146F, 1190–1191, 1191F synthesis, 1190 Electrical activity, in synapse maintenance and elimination, 1393–1397 Electrical potential, neuron(s), 675 Electrical synapses, gap junctions, 1161 Electrochemical gradients, 654F Electrochemical proton gradients, 653, 813, 821F 821F,, 827–840, 853–854 across bacterial membranes, 839, 839F ATP production, 662, 817–819, 819F, 822–824 see also ATP synthase bacterial flagellum, 821–822, 823F chemiosmosis, 813–814, 814F coupling to active transport, 822, 823F generation, 100, 100F 100F,, 820–821, 821F see also Proton pumps membranes and, 640, 655, 820–821, 821F mitochondrial protein import, 716–717, 716F noncyclic photophosphorylation, 850–851, 852F pH gradient, 820–821, 821F proton-motive force, 821, 839F Electrogenic pumps, 662–663, 671 Electron(s) atomic interactions, 46–48 see also Chemical bonds electron shell, 46, 48F, 49 orbitals, 46 Electron crystallography, 611–612 Electron density maps, X-ray diffraction analysis, 528

energetics, 820–821 evolution, 870–876 anaerobic bacteria, 871–872 cyanobacteria, 872, 873–875 fermentation, 870–871 photosynthetic bacteria, 872 iron–sulfur centers, 101 mitochondria see Mitochondrial electron transport chain(s)(s) photosynthesis see Photosynthetic electron transport chain(s) see also ATP (adenosine triphosphate); Electron transfer Electrophoresis, 517 agarose gel, 534 cell fractionation, 517, 518F 518F,, 521–522 gel staining, 517, 518F, 534, 535F polyacrylamide gel see Polyacrylamide gel electrophoresis (PAGE) protein analysis, 518, 521–522, 521F, 522FF protein denaturation, 517 protein purification, 517, 518FF, 521–522, 522FF pulsed-field, 534 recombinant DNA technology, 534 blotting see Blotting DNA sequencing, 532, 534, 535F 535F,, 551 pulsed-field gels, 534, 535F Electroporation, 565–566, 598, 598F Electrostatic interactions, 54 Elements (chemical), 45, 46, 47F 47F,, 48F Elongation factor(s), 179–180

EF-G see EF-G elongation factor EF-Tu see EF-Tu elongation factor transcriptional, 343–345 translational, 376F 376F,, 377–378, 377F Embryo(s)/embryogenesis anteroposterior axis see Anteroposterior axis development cadherins, 1136, 1136F cancer-critical gene function analysis, 1241–1242

calcium store, 725–726 ceramide synthesis, 744–745 cholesterol synthesis, 743, 744–745 COPII-coated vesicle formation, 767, 767F development, 702, 704 distribution during cytokinesis, 1098 evolution, 700F glycolipid synthesis, 744–745 glycoprotein synthesis, 736–738, 737F, 747F glycosphingolipid synthesis, 744–745 lipid bilayer assembly, 743–745, 744F lipid metabolism, 626 membrane, amounts, 697T membrane proteins, 486, 630, 635 microsomes, 511, 726 microtubule motors, membrane organization, 1021 oligosaccharide processing, 775F phospholipid exchange proteins, 745 phospholipid synthesis, 743, 743F phospholipid transport, 745 position in cell, 697 protein assembly, 736 GPI anchor attachment, 742–743, 742F virus assembly and, 1513, 1514F protein degradation see Proteasome(s) protein folding, 736 misfolded protein fate, 739–742, 741F unfolded protein response, 740–742 see also Protein folding protein glycosylation, 736–738, 737F, 747F



Enveloped viruses, 1497, 1505 see also specif specific ic viruses Envgene, Env gene, HIV (human immunodeficiency virus), 1521 Environmental reservoirs, antibiotic resistance, 1523–1524 Enzyme(s), 6, 62–63, 72–75, 158–159 antibiotic resistance and, 1522, 1523F catalysis see Enzyme catalysis classification, 159, 159T coenzymes/cofactors, 167 energetics, 72–73 mechanism of action, 74F multienzyme complexes, 168–169, 169F receptor coupling see Enzyme-coupled receptor(s) regulation, 169–171, 170F cooperativity, 172–173, 173F phosphorylation, 175–176 see also Allosteric regulation; Feedback regulation structure, 72 active site see Active site regulatory sites, 170 tetrahedral intermediate, 160 transition state, 160 see also Metabolic pathway(s); individual enzymes Enzyme catalysis, 159–169 catalytic antibodies, 160, 161F diffusion-limited, 163, 163T, 169 energetics, 72–73 activation energy, 72, 73F, 160, 160F free energy, 72 heat energy, 74 enzyme–product complex, 164F, 166, 166F

Epidermal cells, 1419–1420 Epidermal growth factor (EGF), 1103, 1238 Epidermal growth factor receptor (EGFR), uptake by endocytosis, 794 Epidermis, 1417–1428, 1418F associated structures/appendages, 1418 cells, 1419–1420 granular layer, 1419, 1419F interfollicular, 1418–1419 plants, 1402, 1404F renewal by stem cells, 1417–1428 associated signaling pathways, 1426 rate, 1420 signaling, 1426 stem cell distribution, 1422F waterproof barrier, 1418, 1420–1421 Epidermolysis bullosa simplex, 986, 1005 Epididymis, 1294 Epigenetic phenomena, 219, 471–473, 472F bacteria, 472 in cancer, 1208 chromatin structure, 472 DNA methylation see DNA methylation eucaryotes, 472 genetic inheritance vs., 219F histone modification see Histone modification imprinting see Genomic imprinting inheritance see Inheritance mechanisms, 472–473, 472F mono-allelic expression, 473 positive feedback loop, 471, 472F protein aggregation state, 472F silencing of tumor suppressor genes, 1236, 1236F twin studies, 473, 473F see also Genomic imprinting

b-Endorphin, production, 803F Endosome(s) antigen processing/presentation, 1583F early, 782, 784F, 791, 794F apical and basolateral, 799F epithelial cells, 798, 799F material retrieval, 792–794 function, 696 late, 782, 784F, 794F, 798, 799F membrane amounts, 697T protein sorting, 807F recycling, 793F, 794, 794F, 797–798, 797F, 798F transport to lysosomes, 791–792 volume, 697T see also Endocytosis Endosymbiont hypothesis, organelle evolutionary origin, 859–860 Endothelial cells, 1445–1450, 1447F embryonic origin, 1446 inflammatory response, 1534 structure, 1445 Endothelin-3, 1375 End-replication problem, 292

see enzyme–substrate interactioninteractions Enzyme–substrate equilibrium points, 76, 78F floating ball analogies, 74F kinetics see Enzyme kinetics lysozyme catalysis, 163–165 mechanisms, 74F, 159–160, 160, 164F 164F,, 166F molecular tunneling, 167–168, 168F Enzyme-coupled receptor(s), 892, 892, 893F, classes of, 921 see also individual receptors Enzyme kinetics, 159–160, 162–163FF double reciprocal plot, 163 Kcat cat, 162F, 163 Km, 160, 160F, 162F, 163 Michaelis–Menten kine tics, 162F, 163 reaction rates, 159–160, 160F 160F,, 161F inhibitory ligands, 173, 173F multienzyme complexes, 169 steady-state, 162F–163F turnover number, 159–160, 162F Vmax max, 159, 160F

Epigenome, 473 Epilepsy, voltage-gated cation channels, 682 Epinephrine see Adrenaline (epinephrine) Epistasis analysis, 558–559 Epithelia, 1131, 1132F bacterial adhesion, 1503 cell–cell adhesion and cell junctions, 1133–1135, 1134F anchoring junctions, 1133–1150 apico-basal polarity mechanisms, 1155–1157, 1155F, 1156F occluding junctions, 806, 1150–1158 planar cell polarity mechanisms, 1157–1158, 1157F see also Adherens junction(s); Cadherin(s); Cell adhesion; Cell junction(s); Desmosome(s) columnar, 1133 epithelial–mesenchymal transitions, 1141 folding, 1142, 1143F host defenses, 1525–1526, 1526F microbial evasion of, 1502–1504 mucus and, 1502, 1525

Energy ATP as carrier, 61, 62F see also Activated carriers in metabolism; ATP (adenosine triphosphate) cell use catabolism, 70, 88–103 catalysis, 65–87 energy conversion, 813–815 oxidation reactions, 70 see also Chloroplast(s); Mitochondria; specific uses chemical bonds, 48–49, 49F, 69F electrical energy, 69F forms, 69F free energy see Free energy heat energy, 67–68, 69F see alsoThermodynamics alsoThermodynamics interconversions, 69F, 813 kinetic energy, 69F light energy, 69F see also Photosynthesis potential energy, 69F Engrailedgene/protein, Engrailed gene/protein, 1306F, 1340–1341, 1340F 1340F,, 1352, 1352F protein structure vs. yeast alpha2 protein, 138F Enhancers, 438F, 1309 Enhancesome, 447, 447F Enkephalins, proteolytic processing, 803 Enolase, 121F Enteroendocrine cells, 1437, 1437F Entropy (S), 66–67, 67F, 119F

Enzyme-linked immunosorbent assay (ELISA), 588–589 Enzyme–substrate interactions, 74, 164F diffusion, 74, 75F, 163 fit, 160 kinetics effects, 159–160, 162F see also Enzyme kinetics lysozyme, 164–165, 164F substrate binding, 159–160, 164–165, 164F Eosinophils attack on schistosomes, 1532, 1532F cytokinesis, 1556 lineage and formation, 1452F structure, 1452F upregulation in parasitic infection, 1451 Eosin, staining, 585F Eph B, gut epithelial cell migration, 1440–1441, 1441F Ephexin, 931 Eph receptors, 922, 923T, 1392–1393 Ephrin(s), 922, 923T, 931 receptors see Eph receptors signaling, gut epithelial cell migration, 1440–1441, 1441F see also specif specific ic types Ephrin A2, retinotectal axon guidance, 1393 Ephrin A5, retinotectal axon guidance, 1392 Ephrin A proteins, 1392–1393 Ephrin B2, capillary sprouting, 1447–1448 Ephrin B family, gut epithelium, 1440–1441 Epidemics, 1487

as permeability barriers, 1150 sensory, 1429–1433 structure, 1134F, 1150 see also Connective tissue Epithelial cell(s) apical domain, 798, 799F, 806, 806F endocytosis, 798, 799F glycolipids, 628 IgA transport, 1556F membrane protein distribution, 645 microvilli formation, 1007 polarity, 798, 799F, 806F surface area, 1007 tight junctions, 806 Epithelial–mesenchymal transitions, 1141 Epitopes (antigenic determinants), 1545, 1558F Epitope tagging, 514, 515F 515F,, 516F see also Protein tags Epstein-Barr virus (EBV), 1228T, 1499 Epulopiscium fishelsoni, 14F Equilibrium chemical, 76–77, 77F free energy changes, 76, 77F Equilibrium constant (K), 157–159 relation to free energy changes, 76, 77T, 157, 158F, 159F Equilibrium sedimentation, 511, 512F ERGIC53 protein, ER to Golgi apparatus transport, 767 Erk (MAP-kinase), 929F ERM (ezrin, radixin, mesin) family of proteins, 1009, 1010F

quality control, 767–768 resident proteins, 732F 732F,, 736, 737F, 747F, 767, 770–771, 770F selective retention, 771 retention signal, 736 retrieval pathway, 769–770, 770–771, 770F rough ER, 725F, 726, 726F smooth ER, 724–725, 725F, 726F see also Sarcoplasmic reticulum sphingomyelin synthesis, 744–745 structure, 696, 723, 724F T-cell receptor assembly, 768 unfolded protein response, 740–742 virus assembly and, 1513, 1514F volume, 697T Endoplasmic reticulum (ER), protein transport, 723–745

co-translational translocation, mechanism, 732F to Golgi apparatus, 766–787, 768–769 MHC class I proteins, inhibition by viruses, 1536 misfolded protein fate, 739–741, 741F multipass transmembrane protein integration, 734–736, 735F post-translational translocation, 732F 732F,, 736 quality control, 767–768 retrotranslocation, 391, 739–740, 740F Sec61 protein translocator complex, 730–731, 730F, 731F signal recognition particle (SRP), 727–730, 729F mechanism of action, 728, 730 signal sequences, 726–727, 733–734 single pass transmembrane protein integration, 724–725, 733F SRP receptor, 728 start-transfer signal, 732 stop-transfer signal, 733, 733F


Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



ERp57, protein folding, 737F 737F,, 747F Error correction, DNA polymerase, 269–270, 270FF Erythroblasts, 1459, 1459F Erythrocyte(s), 1453T, 1459 complement lesion, 1529F cytoskeleton, 646, 1008–1009 development, 1454, 1457F, 1459, 1459F see also Erythropoiesis lifespan and turnover, 1459 membrane, 618F, 646 phospholipids, 626 osmolarity regulation, 663, 663F Erythromycin, 385T Erythropoiesis, 1292–1293 colony-stimulating factors role, 1459–1460, 1462 erythropoietin role, 1103, 1459–1460 Erythropoietin, 1103, 1459–1460 cells responsive to, 1459 synthesis, 1459, 1460T target cells and receptors, 1460T ES cells see Embryonic stem (ES) cells Escherichia coli, 14F double membrane, 665F enteropathogenic, 1504, 1504F flagella, tumbling, 942, 943F gene expression reg ulation, 416, 433F, 439, 439T seee La Lac coperon lactose (Lac) operon se operon (Escherichia coli) genome, 25F, 282 chromosome, 1491F replication, 282, 283F, 284F sequencing, 552 size, 18T as model organism, 24–25, 25F mutations, 264, 276–277 phylogenetics, tree of life, 16F

see also Gene expression; Transcription gene structure see Gene structure,eucaryotic metabolic rate, 169 mRNA see Messenger RNA,eucaryotic protein phosphorylation, 176–177 seeTranslation protein synthesis see Translation RNA polymerase(s) see RNA polymerase(s) rRNAs see Ribosomal RNA,eucaryotic seeTranscription transcription see Transcription Euchromatin, 220, 1070 see also Heterochromatin Euglena, tree of life, 16F Eve (Even-skipped) gene combinatorial control, 448–450, 449F modular control of expression pattern, 448–449, 448F, 449F, 1337, 1339, 1339F Evolution Algae, 874, 875F animal–plant divergence, 955 ATP synthesis, 870–876, 871–872, 872–875 cancer as a microevolutionary process,

P pili, 1502sequences, 338F promoter RecA protein see RecA protein replication, 282, 283F clamp loader structure, 275F DNA polymerase structure, 268F refractory period, 282, 284F strand-directed mismatch repair, 277 transposons, 318T uropathogenic, 1502, 1503F E-selectin, 1146 Estradiol, 889F Estrogen, receptor, 891F Ethical issues, reproductive cloning, 1302–1303 Ethylene, 957–959, 958F Ethylenediaminetetraacetic acid (EDTA), 502 Ethylene receptor, 958 Etioplasts, 841 Eubacteria see Bacteria Eucaryote(s), 14, 16F cells see Eucaryotic cell(s) epigenetics, 472 evolutionary origin, 26–27

aerobic fixation, metabolism, 12, 27, 873–874 872–875 carbon molecular see Molecular evolution multicellularity and cell communication, 955 mutation rate analysis, 264 see also Mutation rates myosin and kinesins, 1015–1016 organelle(s), 697–699, 700F see also speci specific fic organelles organelles pathogens, 1520–1521 plant(s), 36, 840–841 proteins see Protein evolution sexual reproduction and, 1271–1272, 1271F tree of life, 15–17, 16F 16F,, 23 see also Origin of life Evolutionary conservation, 17, 17F cytoskeletal elements, 982–983 genome sequence, 39–40, 207, 208F, 246, 250, 292 histones, 213 homeodomain proteins, 138F 138F,, 420–421 meiosis, 1280, 1286 multicellular development, 1306F, 1307

general features, 26–32, 27F genomes DNA methylation, 278 hybrid, 30 Regulatory DNA, 31–32 size, 18T, 30–31, 31F non-coding DNA, 31, 204 see also Noncoding DNA predators, 26–27 transmembrane proteins, 635 Eucaryotic cell(s) cell cycle see Cell cycle cell lines, 505, 506T cell types, 411 see also Cell differentiation chemical composition, mammalian, 63T compartmentalization, 169 DNA localization, 200–201 see also Nucleus intracellular membranes, 169 see also Organelle(s); specific compartments division see Cell division DNA packaging, 202–203 see also Chromatin; Chromosome(s) DNA replication see DNA replication gene expression, 345F, 412 coordination, 462, 463F under Gene regulatory regulatory proteins see underGene protein(s) seeTranscriptional transcriptional regulation see Transcriptional control of gene expression

Evolutionary time, units, 265 Evolutionary tracing, protein family binding-sites, 155–156, 155F Excisionase, phage lambda, 326 Excitatory postsynaptic potential (EPSP), 688 Exocytosis, 750F, 799–809 constitutive, 800, 801F default pathway, 800, 801F extracellular matrix, 800 neurotransmitters see Synaptic vesicle(s) proteolytic processing of cargo, 803 regulated see Regulated secretory pathway secretory proteins, 800 secretory vesicles see Secretory vesicle(s) Exon(s), 346, 347 gene structure (eucaryotic), 206 length variation, 352, 353F recombination in evolution, 255 skipping, 352, 355, 355F “Exon definition hypothesis,” hypothesis,” 352, 353F Exon–junction complexes (EJC), nonsensemediated mRNA decay, 386 Exonucleolytic proofreading, 269–270, 270F Exosome, 358, 485 Experimental embryology, 1310–1311 , 1310F, 1311F Exportin(s), HIV mRNA transport, 485, 486F Export-ready mRNA, 327, 357, 358–359, 359F Expressed (DNA) sequences see Exon(s) Extracellular matrix (ECM), 1178–1195 basal lamina see Basal lamina


carrier protein(s), 655 conservation in see Evolutionary conservation electron transport chain(s), 870–876 gene(s), 16–17 collagen genes, 1185–1186 duplication/divergence see Gene duplication(s) see also Genome evolution genomes see Genome evolution Hemoglobin (Hb), 256–257, 256F homologous recombination and, 305 innate immune system, 1524 major events, 874F metabolic pathway(s), 870–872

cell adhesion/interaction see Cell–matrix adhesions cell secreting/synthesis, 1179, 1179F components, 1165 fibrous proteins, 145–146, 147F, 1179 see also speci specific fic proteins proteins shapes/sizes, 1166F see also Glycoprotein(s); specific macromolecules compressive forces and, 1180–1181 degradation, 1193 localisation, 1194 matrix metalloproteinases, 1194 serine proteinases, 1194 diversity, 1178 exocytosis, 800 matrix receptors, 1169 see also Integrin(s) mechanical interactions, 1189, 1189F, 1190F fibronectin fibril assembly and, 1191–1193, 1192F plant(s), 1180, 1195 see also Plant cell wall tensile forces and, 1042F, 1187–1189 tissue morphogenesis and repair, 1180–1181 see also Bone; Cell adhesion; Cell junction(s) Extracellular signal molecule(s)/pathway(s), 880–881, 880–886 cell response, 885 cell size/number regulation, 1102 classified by range of action, 881–883 CO, 889 combinatorial action, 884 competition for, 1110 development, gonad specification, 1283 growth factors see Growth factors hydrophobic, 8891103, 1110, 1111F inhibitory, 1102, mitogens see Mitogen(s) NO, 887–889, 888F survival factors see Survival factor(s) see also specific types/pathways Extracellular space, 1164 Eya (Eyes absent) absent) gene, 466F Eye color, as polygenic trait, 563 Eye development, genetic control, 466, 466F see also speci specific fic genes Ey (Eyele (Eyeless) ss) gene/protein, 466, 466FF 466FF,, 1306F, 1352 Ezrin, 1009

F F0F1 ATPase see ATP synthase Facilitated diffusion, 653 FACS see Fluorescence-activated cell sorter Factor V, secretion from ER, 767 Factor VIII, 348F, 767 Facultative pathogens, 1490 2 FAD/FADH citric acid cycle, 98, 817 electron carrier, 818–819, 819F fatty acid oxidation, 97F structure, 99F FAK (focal adhesion kinase), 937, 1176–1177, 1176F Familial adenomatous polyposis coli (FAP), 1253, 1253F Familial hypertrophic cardiomyopathy, 1031 Fanconi anaemia groups A-G, DNA repair disorders, 295T FAP (familial adenomatous polyposis coli), 1253, 1253F Fascicles (fiber tracts), neuronal, 1387 Fasciclin3, synapse formation, 1147 Fas ligand, 1120, 1571, 1573F, 1594 Fas receptor protein, 1571, 1594 FASTA FAST A sequence alignment, protein analysis, 531 Fat(s) composition, 58–59 see also Fatty acids digestion, 96 energy source, 91, 94, 96, 824T storage, 8F, 91, 94 structure, 97F see also Lipid(s); specific types Fat cells, 625, 1474–1476, 1475F, 1475FF gene expression regulation, glucocorticoids, 415 Fat droplets, 1474 Fat proteins (cadherin superfamily), 1137, 1138T



Fatty acids, 58–59, 58F, 95, 114–115FF cell membrane components, 58–59, 59F see also Membrane(s); Phospholipid(s) mobilization, 96F oxidation, 96–97, 97F synthesis, 855 see also speci specific fic types Fatty acyl CoA, 96 F-box proteins, SCF regulation, 1064 Fc receptor(s), 1555, 1555F, 1596, 1596F, 1599F phagocytosis role, 788 transcytosis, 797F Fc region, antibody molecule, 1552F, 1554F, 1554F, 1555, 1555F, 1559 Feedback regulation, 170–171 metabolic pathways, 170–171, 837–838 positive see Positive feedback see also Allosteric regulation; Negative feedback (feedback inhibition); Regulatory cascades Feed-forward loops, transcription circuits, 459, 459F F elements, 318T FepA protein, structure, 635 Fermentation(s), 90, 839 earliest cells, 870–871 lactic acid production, 90 pathways, 90F see also Glycolysis Ferredoxin-NADPH reductase, 852F Ferridoxin, 852, 852F Fertility, reduced, 1301 Fertilization, 1297–1303 capacitation and, 1294, 1297 egg activation and sperm binding, 1270F, 1287, 1298, 1298F acrosome reaction, 1297, 1298, 1299F

integrin binding via RGD motif, 1193 protein modules, 141F soluble form, 1191 structure, 1191, 1192F type III fibronectin repeat, 1191, 1193 Fibrous proteins basal lamina, 1165 collagen see Collagen(s) ECM see Extracellular matrix (ECM) see also specif specific ic proteins Field emission guns, 604, 609 Filaggrin protein, 1005 Filaments, cytoskeletal see Actin/actin filaments; Cytoskeletal filaments Filamin actin filament packing, 994F actin filament web formation, 1008–1009 loss, abnormal cell motility, 1008, 1009F Filopodia, 1006, 1037 actin filament nucleation, 996 angiogenesis, 1449 steering neuronal growth cone, 1049, 1387, Fimbriae, 1490F Fimbrin actin cross-linking, 1007, 1007F actin filament packing, 994F Firing rule, for synapse modification, 1395 Fission yeast cell cycle, 1056–1057, 1056F shape mutants, 24F see also Schizosaccharomyces pombe Fitness (evolutionary), sexual reproduction and, 1271, 1271F Fixation carbon dioxide see Carbon fixation

Follicle cells, 1290–1291, 1290F Follicle stimulating hormone (FSH), 1292 Follistatin, 940 Food molecules nonfermentable, evolution of ability to use, 872 obtaining energy, 88–103, 100F see also Catabolism storage, 91, 94–95 Forensic genetics, 547F Formaldehyde, tissue fixation, 585 Formic acid oxidation, 871, 871F Formin, 994F, 998, 999F, 1000F, 1094 Formylmethionine, 380, 1526, 1531 Fossil record, phylogenetic tree comparisons, 248 Founder cell, in C. elegans, 1322–1323 Foxp3, regulatory T cell(s), 1574 Fractionation see Cell fractionation seeTranslational Frameshifting, translational see Translational frameshifting FRAP see Fluorescence recovery after photobleaching (FRAP) Free energy, 75–78, 118–119FF catalysis, 72, 164 see also Enzyme catalysis changes in see Free energy change Delta G (DG) favorable vs. unfavorable reactions, 75F 75F,, 824–825, 825F importance for life, 1, 8 sources, for organotrophs vs phototrophs vs lithotrophs, 12 translation accuracy, 385 Free energy change Delta G (DG), 75–78, 119F calculation, redox potentials, 830 electron transfer, 829 equilibrium constants, 76, 77T reaction concentration effects, 76

Ca increases 1299 and egg activation, 912, 912F, cortical reaction, 1299, 1300, 1300F sperm–egg fusion mechanism, 1298–1299 marine invertebrates, 1297 pronuclei fusion, 1301, 1301F, 1302F sperm-donated centrioles, 1301, 1301F in vitro (IVF) and related procedures, 1301–1303 capacitation, 1297 pronuclei fusion, 1302F Xenopus embryo, 1057 zygote formation, 1269 see also Zygote Fever, 1488, 1534 FGF see Fibroblast growth factor (FGF) FGF8 protein, 1371 Fiber tracts (fascicles), neuronal, 1387 Fibril-associated collagen(s), 1185, 1187–1189, 1189F Fibrillar collagen(s), 1184–1189, 1186T fibril-associated vs., 1188–1189 see also Collagen(s) Fibrillarin, nuclear localization, 365F

microscopy preparation, 585, 605, 605F 13, 15F, nitrogen, 13,sample 100 Flagella, 1031–1034 bacterial, 14F, 942, 943F, 1033, 1490F proton gradients, 821–822, 823F, 839–840, 839F cilia comparison, 1031 motility, 1031F sperm, 1293, 1293F Flagellin, 1033 gene rearrangements, 454–455, 455F Flamingo protein, 1137, 1138T, 1145, 1158 Fleas, plague transmission, 1502, 1502F FLIP,, fluorescence loss in photobleaching (FLIP) FLIP Flip-flop switch, 457, 458F, 466 Floor plate, of spinal cord, in growth cone guidance, 1388, 1388F Flora, normal microbial, of human body, 1486, 1501 Flow cytometry, 576, 1059–1060, 1060F Flower(s), 1401F development, 1413, 1413–1414 specification by homeotic selector genes, 1414F Flowering plants see Plant(s)

reaction coupling, 75F, 78F, 825, 825F sequential reactions, 77–78 Free radicals, 832–833, 874, 1532 Freeze-etch electron microscopy, 610F FRET see Fluorescence resonance energy transfer (FRET) Fringe family of glycosyltransferases, 947 Frizzledgene/protein, Frizzled gene/protein, 1316T C. elegans development, 1324, 1325 planar cell polarity, 1158 polarity-signaling pathway, 1359 Frog(s), 411, 413F see also Xenop Xenopus us laevis Frozen sections, 585 Fructose 1, 6-bisphosphate, 120F Fructose 6-phosphate, 120F Fructose, structure, 112F Drosophila hila melanogaster Fruit fly see Drosop F-site (ribosome binding), 375F, 376 FtsZ protein, 989–991, 989F 989F,, 989FF F-type pumps (ATP (ATPases), ases), 659–660, 660F Fugu rubripes rubripes see Puffer fish (Fugu rubripes) Fumarase, 123F

Fibrillin, 1190–1191 Fibrin, formation, 264 Fibrinogen, activation, fibrinopeptides, 264 Fibrinopeptides, mutation rate, 264 Fibroblast(s) cell crawling, 1036 cell culture, phase-contrast microscopy, 504F chondrocyte transformation into, 1468–1469 differentiation and changes, 464, 1467–1468 ECM organization, 1189 ECM synthesis, 1179, 1179F functions, 1467–1468 mature and immature, 1468 organization of microtubules, 1048F replicative senescence, telomeric repeats, 293 transformation to cartilage and bone, 1468–1471 to fat cells, 1475F in wound repair, 1467 Fibroblast growth factor (FGF) in angiogenesis, 1449 FGF8 protein, 1371 FGF10, in lung development, 1381–1382, 1382F heparan sulfate binding, 1183 Fibronectin, 1191 basal lamina, 1165 connective tissue, 1188 fibril assembly integrins and, 1192 tension effects, 1191–1193, 1192F, 1193F gene, 1191

FLP recombinase, 1348, 1349F FLP recombinase target (FRT), 1348 Fluid-phase endocytosis, 789 Fluorescein, 586–587 Fluorescence, 586 Fluorescence-activated cell sorter (FACS), 502, 503F, 1218, 1218F Fluorescence in situ hybridization (FISH), chromosome puffs, 239 Fluorescence loss in photobleaching (FLIP), 643, 644F, 753F Fluorescence microscopy, 586–589 applications, 587 confocal, 590–592, 591F, 592F fluorescent dyes, 586–587, 587F immunofluorescence, 587F 587F,, 588–589, 588F, 589F microscopes, 586, 586F, 591F nanoparticles, 587, 588F quantum dots, 587, 588F single-cell expression analysis, 576 total internal, 599, 600F Fluorescence recovery after photobleaching (FRAP), 595, 596F, 643, 644F, 753F Fluorescence resonance energy transfer (FRET), 526, 526F, 593–594, 595F Fluorescent analog cytochemistry, 597 Fluorescent dyes, 586–587, 587F Foam cells, 1500, 1500F Focal adhesion kinase (FAK), 937, 1176–1177, 1176F Focal adhesions, 1170, 1176–1177, 1176F

Fumarate, 122F, 123F Functional genomics, tagged knockouts, 569–571 Fungi antibiotic production, 383–384 dimorphism, 1494 evolutionary origin, 29–30 pathogenic, 1494 prion proteins, 398 Fushi tarazu mutant, Drosophila, 1337 Fusion proteins virus, membrane fusion, 764–765 see also Protein tags; individual fusions



G Delta G (DG) see Free energy change Delta G (DG) G0 phase of cell cycle see Cell cycle G1-Cdk, 1062, 1066, 1103–1105 G1-cyclins, 1062 G1 phase of cell cycle see Cell cycle; Cell cycle control G1/S-Cdk, 1062, 1066, 1103–1105 G1/S-cyclins, 1062 G2/M checkpoint, 1061, 1062, 1066, 1105 G2 phase of cell cycle see Cell cycle GABA (g-aminobutyric -aminobutyric acid) neurotransmitter role, 684, 808 receptors, psychoactive drug effects, 686 Gag (viral capsid) proteins, translational frameshifting, 383, 384F, 485F, 1498F,

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



1521F GAGs see Glycosaminoglycans (GAGs) Gain-of-function mutation(s), 528F 528F,, 557–558, 564F Gal4 gene/protein, 1350F DNA sequence recognition, 418T GAL4/UAS technique, 1350F Galactocerebroside, 628F Galactose, in N-linked oligosaccharides, 773F Gamete(s), 1269 haploid state, 1269, 1272, 1281 production by cell division see Meiosis see also Egg (ovum); Spermatozoa Gamma aminobutyric acid (GABA) see GABA (g-aminobutyric -aminobutyric acid) Ganglioside(s) GM1, 628F, 629 membranes, 628 GAP see GTPase-activating proteins (GAPs) Gap genes, 1333, 1337–1338, 1337F, 1338F Gap junction(s), 1158–1164 cell communication, 884, 884F channel proteins, 667 columnar epithelium, 1134, 1134F dynamics/turnover, 1160–1161, 1160F electrical coupling, 1158–1159 functions, 1161 metabolic coupling, 1158–1159 oocyte–follicle cell, 1290 permeability regulation, 1161–1162, 1162F plasmodesmata vs., 1163 size determination, 1159, 1159F structure, 1159, 1159–1161, 1159F, 1160F see also Connexins structure–function relationship, 1159–1160 GARP gene regulatory proteins, family members in different eucaryotes, 1400T

loss, cancer cells, 1232 see also Cancer-critical genes manipulation see Recombinant DNA technology; Transgenic organism(s) numbers, 204, 204F orthologs, 20–21, 20F, 21F paralogs, 20–21, 20F, 21F pseudogenes see Pseudogenes sequencing see DNA sequencing structure see Gene structure transcription units, 336 see also entries beginning gene/genetic seeTranscriptional Gene activator proteins see Transcriptional activator(s) Gene batteries, coordinated by critical regulatory protein, 463–464 Gene clock, 461F Gene cloning, 542 PCR cloning, 544–546, 545F “shotgun”approach, 542 see also DNA cloning Gene control region(s), 438F 438F,, 440, 441F enhancers, 438F insulators, 452F, 453 LCRs, 450–452, 451F promoters see Promoter elements regulatory modules in Drosophila (eve gene), 448, 449F in mammals, 450–453, 450F, 451F, 452F see also Gene regulatory protein(s) Gene conversion, 314–315 Holliday junctions, 311, 314–315 mismatch conversion, 315F in tumor suppressor gene loss, 1236F Gene duplication(s), 18, 19F, 40F, 246 collagen genes, 1185–1186

Gastric acid secretion, 1436 pyloriassociation, Helicobacter pylori association, 1503 Gastric cancer, Gastrula, 1363F Gastrulation, 1307 gut origin by, 1307, 1307F sea urchin, 1307F Xenopus see Xenopus laevis development GATA-1, 418T, 451F, 1456 Gated transport, between nucleus and cytoplasm, 700, 701F Gating, ion channels see Ion channel(s) Gcn4 protein, 418T, 424F, 424F, 490–491 GEF see Guanine nucleotide exchange factor Geiger counter, 601 Gel(s) GAGs and, 1179–1180 gel-forming proteins, 1006, 1009F Gel-filtration chromatography, 512, 514F matrices, 534F protein purification, 535F Gel-mobility shift assay, 427–428, 428, 428F Gelsolin, 994F, 1000 Gel transfer see Blotting

fate of duplicates, 255 40F, 246, 254–255 functional divergence, see also Gene families genome evolution, 253–254 protein kinase evolution, 176 in protein module shuffling, 140–141, 141F rates, 255 vertebrate evolution, 38–39 Xenopus genome, 38–39, 39F zebrafish genomes, 255 see also Gene families; Genetic redundancy; Pseudogenes Gene expression, 6, 199F 199F,, 200F analysis, 414FF, 553–576 2D-PAGE, 412, 414F approaches, 553 see also Genetics DNA microarrays, 34–35, 412, 414F, 537, 574–575, 574F, 575F cluster analysis, 575, 575F reporter gene assay, 572–573, 572F cancer and, 1237–1239 chromatin condensation, 285–286

Geminin, destruction by APC/C, 1068–1069 GEMS (gemini of coiled bodies), 363–364, 364, 365F Gene(s) amplification in cancer, oncogenes, 1237–1239 PCR see Polymerase chain reaction (PCR) cancer-critical see Cancer-critical genes chromosomal location, 204–205, 204F 204F,, 554F see also Genetic mapping definition, 7–8, 195, 204, 440, 554F history of concept, 480–481 modification, 480–481 DNA structure and, 199–200, 202 see also DNA structure; Genetic code evolutionary innovation, 19 expression see Gene expression function(s) antibiotic resistance, 318F biochemical analysis, 23–24 deduction from mutant phenotype, 23–24,

heterochromatin role, 220 see also Chromatin; Chromosome condensation; Gene silencing; Heterochromatin control/regulation see Gene expression regulation DNA methylation and, 467–468, 468F DNA signals for transcription, 336–340 see also Gene control region(s) efficiency, 331, 332F eucaryotic, 345F, 412, 462, 463f heritability, 454, 458, 458F, 466 see also DNA methylation; Epigenetic phenomena; Gene silencing human, 412 position effects, 220, 221F position effect variegation (PEV), 221, 221F procaryotic, 345F proportion of genome expressed, 412 transcription units, 334F 334F,, 336 variation between cell types, 412 see alsoTranscription; alsoTranscription; Translation Translation Gene expression regulation, 411–499, 451F combinatorial control, 424–425, 425, 425F, 465, 465F controllable steps, 379F, 415 coordinated control, 462–463, 462F, 464, 464F DNA structure role, 416–417, 417F evolution, 439–440 gene control regions see Gene control region(s) genetic switches see Genetic switches


tagged knockouts, 570 targeted mutations, 575 housekeeping, 434, 470 prediction from sequence homology, 22 generation from pre-existing genes, 18–19 homologs, 20–21, 20F, 21F, 246 identification, 207, 329, 429, 560F see also speci specific fic methods imprinted see Genomic imprinting localization see Genetic mapping

hormonal, glucocorticoid regulation, 412, 415, 463, 463F manipulation site-specific recombination, 325–326

memory devices, 458, 458F mRNA degradation control, 379F 379F,, 415, 492–493 “noise,” 476–477 oscillatory devices, 461, 461F post-transcriptional see Post-transcriptional regulation protein activity control, 379F, 415 regulatory proteins see Gene regulatory protein(s) seeTranscriptional transcriptional see Transcriptional control of gene expression see also Chromosome puffs; Drosophila development Gene families common to archaea, bacteria, and eucaryotes, 23, 24T evolution, 19–21 duplication and divergence, 255 globin genes, 256–257, 256F see also Globin genes see also Protein families Gene knockouts deletion cassettes, 570 functional genomics, 569–571 mouse, 566–568, 567F, 568F production, 567F Gene oscillation, synthetic biology, 461F General recombination see Homologous recombination Gene regulatory circuits, mathematical modeling, 35, 35F Gene regulatory protein(s), 222, 343, 343F, 379–471, 418T analysis techniques affinity chromatography, 428–429, 429F chromatin immunoprecipitation, 431–432, 432F DNA sequence determination, 429–430, 430F gel mobility shift assay, 427–428, 428F discovery, 416 DNA sequence recognition, 418–419, 418T prediction, 426 sequence determination, 429–430, 430F see also DNA-binding motifs eucaryotic, 399–409, 434, 440–441 seeTranscriptional activators see Transcriptional activator(s) complex assembly, 445–447, 447, 447FF, 464–465 see also Combinatorial control coordinated gene control, 462–463, 463F, 464, 464F developmental expression, 448, 448F 448F,, 449FF diversity, 31 downstream gene batteries, 463–464 enhancesome, 446–447, 447F

glucocorticoid receptor protein, 463, 463F major families, 1400T mechanisms, 438F, 442F, 445, 445F, 446F modular nature, 442, 442F 442F,, 447–448, 449FF multicellular development and, 465, 465F see also Drosop Drosophila hila development regulation, 450–451, 451F repressors see Repressor protein(s) transcriptional synergy, 444–445, 444F, 464–465 see alsoTranscription alsoTranscription factors,general (TFII) heterodimerization, 424–425, 425F see also Combinatorial control latent see Latent gene regulatory proteins negative control, 434, 436F see also Repressor protein(s) positive control, 434, 436F see alsoTranscriptional alsoTranscriptional activator(s) protein–DNA interactions, 416, 417F 417F,, 418–419, 419F see also DNA-binding motifs (proteins); Protein–DNA interactions protein–protein interactions see Combinatorial control recognition sites see Genetic switches seeTranscription transcription factors see Transcription factors,general (TFII) seeTranscriptional transcription regulation see Transcriptional control of gene expression see also speci specific fic proteins proteins Gene replacement, genetic engineering, 566F


Gene repressor proteins see Repressor protein(s) Gene silencing CG (CpG) islands, DNA damage, 300–301 heterochromatin role, 220, 221F mating-type switching in yeast, 456, 457F tumor suppressor genes, 1236, 1236F see also DNA methylation; Genomic imprinting; Repetitive DNA; X-inactivation Gene structure eucaryotic, 347, 348F exons see Exon(s) gene control region see Gene control region(s) human, 205–207, 206, 206T, 348F intron–exon organization, 348 introns see Intron(s) pre-mRNA processing, 347 see also Splicing procaryotic bacterial chromosomes, 202, 1491F operons, 433F, 462–463 Genetic code, 199–200 codons see Codons DNA structure and heredity, 199 evolution, 300, 407–408 reading frames, 368, 368F redundancy, 247, 354, 367, 368 universal, 367 variations, 382–383 Candida CUG codon, 383 mitochondrial variations, 367, 383, 862, 862T translational recoding, 383, 383F 383F,, 384F see alsoTranslation alsoTranslation Genetic disease integrin mutations, 1172–1174 somatic nuclear transplantation, 508 Genetic diversity, meiosis role, 1271, 1279–1280, 1279F Genetic engineering, 532, 564–568 dominant negative mutant generation, 564, 564FF gene replacement, 566F germ cell gene insertion, 565–566 inducible promoters, 564 protein sequence alteration, 564–565, 565F sequence tags, 570 seeTransgenic transgenic organisms see Transgenic organism(s) see also Genetics; Recombinant DNA technology; specific techniques Genetic exchange, homologous recombination, 305 Genetic information defining feature of life, 2 not necessarily encoded in nucleic acid (prions), 1498 Genetic instability cancer, 1214–1215, 1254, 1254F DNA repair defects, 295T p53 loss after telomere shortening, 1217 fromp53 from prevention, 315F Genetic mapping based on meiotic recombination, 554F linkage analysis, 559–560, 560F see also DNA sequencing Genetic mosaic, Drosophila development, 1348 Genetic recombination see Recombination Genetic redundancy, 39 Genetics classical, 553, 554–527 chromosomes see Chromosome(s) complementation tests, 528F, 558 genes see Gene(s) genotype, 553 haploid–diploid cycle, 554F see also Meiosis heterozygote, 554F historical aspects, 195–196, 195–197 homozygote, 554F linkage analysis, 560F mutation see Mutation(s) phenotype, 553, 554F recombination see Recombination two genes or one?, 528F see also Complementation tests reverse, 553, 563, 563–564, 575 dominant negative mutant generation, 564FF gain-of-function mutant generation, 564F gene replacement, 567F see also Recombination; Transgenic organism(s)

germ-line mutations, 575 protein sequence alteration, 565F RNA interference (RNAi), 572 site-directed mutagenesis, 565F techniques, 563–564 in vitro mutagenesis, 575 see also DNA cloning; Genetic engineering Genetic screens, 553, 553, 555 mutant identification, 556–557 behavioral, 556, 557F Genetic switches complex developmental, 447–448, 448F see also Eve (even-skipped (even-skipped)) gene DNA sequences, 418 see also DNA-binding motifs evolution, 439–440 mechanisms, 432–454, 436F operators, 433–434, 433F, 434F repressors see Repressor protein(s) seeTranscriptional transcriptional activators see Transcriptional activator(s) Genital ridge, 1283 Genome(s), 8, 200 Arabidopsis thaliana, 142 chromosomes see Chromosome(s) cloning, 541–542 see also DNA cloning; DNA libraries completely sequenced organisms, 18T complexity, 142, 204–205 CG (CpG) islands, 470–471 gene numbers in different organisms, 18T, 863–864, 864F noncoding regions see Noncoding DNA variation in intron/exon length, 352, 353F composition, 329 conserved synteny, 207, 208F, 250 11–26 diversity, Xenopus, 38–39 duplication(s),Xenopus, duplication(s), evolution see Genome evolution HIV, 485F human see Human genome; Human genome information coding, 329, 330F, 331, 331F central dogma see Messenger RNA; Transcription; Translation Translation potential, 348 see also Genome evolution see also DNA (deoxyribonucleic acid); Gene expression; Genetic code mitochondrial see Mitochondrial genome mouse see Mouse multicellular development control, 31–32, 32F organelles chloroplast see Chloroplast(s), genome mitochondrial see Mitochondrial genome replication, 200 see also Chromosome replication; DNA replication sequencing see Genome sequencing size variations, 18T, 30–31, 200, 246, 251

minimal for life, 10, 11F minimum gene complement (Mycoplasma), 10, 570–571 see also Genome evolution transposon movements, 323 see also indiv individual idual species species Genome evolution, 245–260 accelerated change, 253, 254F additions, 250, 258 CG (CpG) islands, 434, 470 chromosome(s), 207, 208F gene duplications, 253–254 gene number vs complexity, 246 human variation, 258–260, 259–260, 259F human vs chimpanzee, 247, 247F, 248F human vs mouse, 249–250, 249F human vs puffer fish, 251F intron–exon gene structure, 348 losses, 250, 258 mechanisms, 246 exon shuffling, 257 gene duplication see Gene duplication(s) genome duplication, 38–39, 140–141, 255 mutation see Mutation(s) see also Mutation rates neutral mutations, 257–258 organellar, 859–860, 860F, 861F protein module integration, 140 sequence analysis, 207, 246 conservation, 39–40, 246 conserved sequence identification, 252–253,


252F conserved synteny, 207, 208F, 250 mammals, conservation in, 39–40 single nucleotide polymorphisms (SNPs), 259 see also Genome sequencing sequence divergence, 247 ancestor tracing, 247, 248F human–mouse, 249F molecular clock hypothesis, 248–249 phylogenetic trees, 247, 247F see also Comparative genomics size changes, 251 synteny blocks, 250 transposons, 249F, 250F, 323, 323F zebrafish, 255 Genome instability DNA repair defects, 295T prevention, 315F Genome sequencing, 18T, 142, 551–552 comparative see Comparative genomics conserved vs. nonconserved regions, 207 homology searches, domain fusions, 560F see also Genome evolution Genomic DNA clone, 542 PCR cloning, 544–546, 545F, 546F Genomic DNA libraries, 542 human, 542F vs. cDNA, 543F, 544 Genomic imprinting, 468–470, 469F, 1287 as epigenetic phenomena, 472–473 insulin-like growth factor-2, 469–470 see also Gene silencing; X-inactivation Genomic plasticity, retroviruses, 1520–1521 Genomics comparative see Comparative genomics genome sequence analysis, 552 tagged knockouts, Genotype, 553, 554F 569–571 Geochemical energy, fueling life, 12 Germ cell(s), 1271 Caenorhabditis elegans, 1322–1323 determinants, 1282, 1282F gene insertion, genetic engineering, 565–566 see also Egg (ovum); Gamete(s); Spermatozoa Germinal centers, antibody affinity maturation, 1566 Germination, energy reserves, 95 Germ layers, 1365–1366, 1365F Germ-line DNA, antibody genes, 1563F functions, 265F seeTransgenic gene replacement see Transgenic organism(s) mutations, 264, 265, 575 reverse genetics, 575 P granules role, 1323–1324 Vasa protein in determination of, 1324 GFP see Green fluorescent protein (GFP) Giant chromosomes see Polytene chromosome(s) Giardia, in tree of life, 16F Gibberellic acid (GA3), 1406F Gibberellins, 957, 1403 Gibbs free energy see Free energy Glandular fever, Epstein–Barr virus (EBV), 1499 Glanzmann’ss disease, 1174 Glanzmann’ GlcNAc phosphotransferase, 785, 786F Gleevec (STI-751), chronic myelogenous leukemia therapy, 1261 Glial cells, 680F 680F,, 1383–1384 myelin production, 678 radial, 1385F Glioblastoma, epidermal growth factor (EGF), 1238 Gli protein, 951 Globin(s), 256 fetal, 256, 256F genes see Globin genes homologies and evolutionary tree, 21F, 256F see also speci specific fic types b-Globin gene, 256 abnormal pre-mRNA processing, 355F chromatin structure, 288 gene expression regulation, 450–452, 451F human DNA sequence, 199F 199F,, 200F human vs mouse, 250F, 323F mutations, 288, 288F, 355F, 452 see alsoThalassemia, alsoThalassemia, b-globin abnormalities structure, 348F Globin genes expression regulation, 450–452, 451F, 452F see also Locus control region(s) gene clusters, 450–451, 451F, 452F

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



evolution by duplication, 256–257, 256F a-globin, 256–257 b-globin seeb-Globin gene d-globin, 256–257, 451, 452F g-globin, -globin, 451, 452F pseudogenes, 257 Glomeruli, of olfactory bulb, 1430 Glucagon, 907T Glucocorticoid receptor protein, gene expression regulation, 463, 463F Glucocorticoids, gene expression regulation, 412, 415, 463, 463F Gluconeogenesis, 102 Glucose disaccharide biosynthesis, 57F oxidation, 57, 100F, 120F total energy yield, 823, 824T see also Glycolysis structure, 56F, 112F transport, 657F, 798 Glucose 6-phosphate, 120F Glucose transporter, transcytosis, 798 Glucosyl transferase, protein folding function, 739 Glutamate (glutamic acid) neurotransmitter role, 684, 691, 808 structure, 129F Glutamine, structure, 129F Glutamine synthase, ATP hydrolysis, 81F Glutaraldehyde, 585, 605, 605F Glutathione dismutase, 868 Glutathione S-transferase (GST), protein tags, 514–515, 515F, 516F Glyceraldehyde, 112F Glyceraldehyde 3-phosphate, 91, 92F, 120F, 121F, 846 carbohydrate source, 854 carbon-fixation cycle, 845, 845F glycolysis, 854–855 Glyceraldehyde 3-phosphate dehydrogenase, 91, 121F Glycine, 129F neurotransmitter role, 684, 808 Glycocalyx, 636, 637F Glycogen, 91, 94, 94F Glycogen synthase kinase 3b (GSK3b), 949, 949F Glycolipid(s) aggregates, 115F membranes, 628–629, 628F side chain diversity, 636 structure, 115F synthesis in ER, 744–745 Glycolysis, 88–91 anaerobic, 88, 839 see also Fermentation(s) ATP production (net gain), 89, 121F chloroplasts, glyceraldehyde 3-phosphate, 854–855 energetics, 91 energy storage by reaction coupling, 91, 92F enzymes, 88–89, 88–89, 91, 92F, 120–121FF see also specif specific ic enzymes evolution, 88 metabolic interrelationships, 102F NAD+/NADH role, 89 pathway, 89F, 91, 92F, 93F, 120–121FF Glycoprotein(s), 635–636 cell–cell adhesion, 636 synthesis, 736–738, 737F, 747F Glycosaminoglycans (GAGs), 1179–1180 basal lamina, 1165 compressive forces, 1180–1181 protein attachment see Proteoglycan(s) proteoglycan production, 776 structure, 1179, 1179F, 1180F see also speci specific fic types Glycosphingolipid(s) lipid rafts, 807 protein sorting, 806–807 synthesis, endoplasmic reticulum (ER), 744–745 Glycosylation, 776–777 proteins see Protein glycosylation Glycosylphosphatidylinositol (GPI) anchor, 630, 636, 742–743, 742F, 807 cell-surface proteoglycans, 1183 Glyoxylate cycle, 722 Glyoxysome(s), 722, 722F Glypican, 1184 Goblet cells, 1434–1436 Golgi apparatus, 772 intestinal, 1526F

mucus secretion, 772, 774F 774F,, 1437 respiratory epithelium, 1435, 1435F structure, 774F Golgi apparatus (Golgi complex), 766 antigen processing/presentation, 1583F cellular distribution, 772 cis Golgi network (CGN) seeCis Golgi network (CGN) cisternae, 771–772, 771F, 778F cisternal maturation model, of transport through, 778 clathrin-coated vesicle formation, 754–758, 756F distribution during cytokinesis, 1098 enzymes, importance, 731 exit face, 772, 778F functional compartmentalization, 778F membrane amounts, 697T membrane proteins, glycosylation, 635 microtubule motors, membrane organization, 1021 molecular compartmentalization, 773 oligosaccharide chain processing, 773–775, 775F, 777 position in cell, 697 proteoglycan assembly, 775–776 selective protein retention, 731 structure, 696, 771–773, 771F, 778F trans face (exit face), 772, 778F trans Golgi network (TGN) see Tr Trans ans Golgi network (TGN) transport from ER, 766–787 see also Endoplasmic reticulum (ER) transport through, 777–778 transport to cell surface from, 799–809 see also Exocytosis transport lysosomes, 779–787 , 785F GlcNActo phosphotransferase, 785, 786F M6P addition, 785 M6P receptor, 783–784 vesicular transport model, of transport through, 777–778

volume, 697T Gonad(s), development PGC migration, 1283, 1283F, 1285 Srygene Sry gene and testes development, 1283–1285, 1286F Gooseberrymutant, Gooseberry mutant, Drosophila, 1337 Gp 120 protein, 765F GPI-anchored proteins see Glycosylphosphatidylinositol (GPI) anchor G protein(s) (trimeric GTP-binding proteins/ATPases), proteins/ATP ases), 179, 892, 905 a subunit, 905, 906F bgcomplex, 905, 906F activation, 905–906, 906F downstream effects cAMP, 905–906 inositol-phospholipid signaling, 909–911 on ion channels, 906–907 G12, 906 Gi (inhibitory G protein), 906–907, 919T Go, 919T Golf, 917, 919T Gq, 919T Gs (stimulatory G protein), 906–907, 919T Gt (transducin), 918, 919T inactivation, 906F monomeric GTPases vs G proteins, 896 receptor coupling see G protein-coupled receptors (GPCRs) G protein-coupled receptors (GPCRs), 641, 892, 893F, 903F, 904, 904–921, 904F, 905F cyclic AMP and, 905–908, 906F, 907F, 907T desensitization, 920, 920F Flamingo proteins, 1145 inositol phospholipids and, 910F, 910T, 911F, 911F, 911FF, 919–921 olfactory receptors, 917 photoreceptors, 917–918 regulating ion channels, 916 signal amplification, 919–920, 920F visual transduction, 917–918, 918F see also specific receptors G protein-linked receptor kinases (GRKs), 920, 920F Graft rejection, 1575 Gram-negative bacteria, 1490F 1490F,, 1527 Gram-positive bacteria, 1490F 1490F,, 1527 Granular layer, of epidermis, 1419, 1419F

Granules, phagocytic cells, 1532 Granulocyte(s), 1460, 1460T see also Basophils; Eosinophils; Neutrophil(s) Granulocyte CSF (G-CSF), 1460T Granulocyte/macrophage CSF (GM-CSF), 1460T, 1461F Granulocyte/macrophage (GM) progenitor cells, 1460 Granulosa cells, 1291, 1291F, 1298 Granzyme B protease, 1571, 1573F Grb-2 protein, 928 Green fluorescent protein (GFP), 592–593, 594F gene expression regulation, 476–477 intracellular visualization see Fluorescence resonance energy transfer (FRET) structure, 593F vesicular and intracellular transport studies, 753F Green sulfur bacteria, electron transport, 873F Grids, electron microscopy, 605, 605F GroEL chaperone, 390F Ground tissue, of plants, 1402, 1404F Group I introns, 334, 356, 356F Group II introns, self-splicing mechanism, 356, 356F Growth cones, neuronal, 1048, 1049F, 1386–1389, 1386F, 1447F change of sensibilities, 1389 collapse, 932F steering developing neurite, 1387–1389 Growth factors, 1102 competition for, 1110 mechanisms of action, 1108, 1109F see also Mitogen(s); specific factors Growth regulators in plants (plant hormones), 957–961

Growth, retardation, DNA repair defects, 295T GSK3b, 950, 952F GTP (guanosine triphosphate), 98 protein phosphorylation, 178–179 structure, 99F GTPase see GTP-binding proteins (GTPases) GTPase-activating proteins (GAPs), 179, 180F, 896, 896F GTP-binding proteins (GTPases), 178–181 cellular regulators, 178–179, 179F, 180F phosphorylation vs., 180F monomeric, 179–180, 179F, 180F, 758–760 Rab family (vesicle docking), 760–761 Ran GTPase, 708–709, 709F, 710F Ras family see Ras GTPase(s) Rho family see Rho GTPase(s) Sar1 (vesicular coat assembly), 759, 759F trimeric (G proteins) vs., 896 see also speci specific fic GTPases movement generators, 179–181, 181 regulation, 179, 180F see also GTPase-activating proteins (GAPs); Guanine nucleotide exchange factor (GEF) trimeric see G protein(s); G protein(s) (trimeric GTP-binding proteins/ATPases) GTP caps, microtubules, 977, 979, 979F GTP exchange factors, 377F Guanine, 197 base-pairing, 198F deamination, 301F RNA structure, 332 structure, 116F, 301F Guanine nucleotide disocciation inhibitors (GDIs), 931 Guanine nucleotide exchange factor (GEF), 896, 896F eIF-2 recycling, 488–489, 490F functional role, 179, 180F microtubule association, 1043–1044 mitotic spindle formation, 1081 Ras GEF, 179 RhoA activation, 1095 Guanosine triphosphate see GTP (guanosine triphosphate) Guanyl transferase, 5¢ mRNA capping, 346, 347F Guanylyl cyclase regulation, 888F, 889 see also Receptor guanylyl cyclases Guide RNAs, 361, 362F RNA editing, 483, 484F Gut cell migration, 1440–1441, 1440F cell turnover, 1436–1437 development, 1307, 1307F, 1322F endocrine cells (enteroendocrine cells), 1437,

intestinal, 1526F

Granular layer, of epidermis, 1419, 1419F

endocrine cells (enteroendocrine cells), 1437,


1437F histology, 1436, 1436–1444, 1436F Vibrio cholerae colonization of, 1503

H H+ (proton) see Hydrogen ion (H+, proton) Haemophilus influenzae, genome sequence, 551–552 Hair cells, 609F 609F,, 1429, 1430–1432, 1431FF Hair follicle, 1418F 1418F,, 1426 Hairpin structures, RNA, 338, 403F Hairygene, Hairy gene, 1337, 1371 Half-life, radioisotopes, 601, 601T Halobacterium salinarum,640–642, 640F Haloferax, in tree of life, 16F Haploid state diploid state vs., 34 in sexual reproduction, 1269–1271 , 1270F, 1272, 1281 see also Meiosis yeast, 34 Haplotype blocks, 561–562, 562F Haplotype maps (hapmaps), 561, 562 HATS see Histone acetyltransferases (HATS) HDACs see Histone deacetylases (HDACs) HDV fold, 406F Head polymerization, 86, 87F 87F,, 373 Heart muscle see Cardiac muscle Heat energy, 67–68, 69F, 118F brown adipose tissue, 838 enzyme catalysis, 74 Heat-shock induced somatic recombination, 1348 proteins (HSPs), 388 also specific proteins Chaperones; seesee also DNA repair Heavy (H) chain (antibodies), 157F, 1553–1557, 1554F constant domains, 1558–1559 , 1559F, 1560F gene segment pool, 1563F IgM, 1555F repeating domains, 1559 variable domains, 1558–1559, 1559F, 1560F Heavy isotopes, equilibrium sedimentation, 511 Hebb rule, 1396 Hedgehog protein, 950 Hedgehog signaling pathway, 950 absent inArabidopsis, in Arabidopsis, 1400 animal development, 1316F Drosophila, 1340, 1353, 1353F in gut, 1441 in skin, 1426 Helicobacter pylori chronic illness, 1500 colonization of stomach, 1503 genome size, 18T stomach cancer causation, 1228, 1229 Helix common molecular structure, 143, 145 double (DNA) see DNA structure handedness, 143 properties, 146F Helix destabilizing proteins see Single-strand DNAbinding proteins (SSBs) Helix–loop–helix motif, 425–426, 426F Helix–loop–helix proteins, 425–426, 426F Helix–turn–helix motif, 419–420, 420F sequence recognition, 420–421, 421F structure, 420F Helix–turn–helix proteins, 420, 420F DNA-binding motif see Helix–turn–helix motif homeodomain proteins see Homeodomain proteins Helper T-cell(s) (TH), 1570, 1574–1575, 1583–1585 antigen recognition, 1583–1585 B cell activation, 1574–1575, 1597–1598 CD4 co-receptor role, 1580–1581, 1581F class switching, 1568 cytokine production by, 1598T immunological synapse, 1597T selection in thymus, 1585–1586, 1587F vs.T TH1 vs. TH2 choice, 1574F, 1592–1594, 1593F type 1 (TH1), 1574F, 1575, 1592 activation of macrophages, 1594–1595, 1595F dendritic cell activation, 1593F TH2 vs., 1574F, 1592–1594, 1593F type 2 (T 2), 1574F, 1575, 1592–1593


activation of B cells, 1598 cytokines, 1593 dendritic cell activation, 1593F TH1 vs., 1574F, 1592–1594, 1593F see also CD4 T-cell(s); T cell(s) Hemangioblastoma, 1449 Hematoxylin, 585, 585F Heme groups, 830F, 831 iron coordination, 166, 166F porphyrin rings, 830F 830F,, 831 Hemidesmosome(s), 1134, 1134F 1134F,, 1135T, 1170, 1171F intermediate filament attachment, 1144F 1144F,, 1171F keratin filaments, 986 Hemoglobin (Hb), 21F cooperativity, 256, 256F evolution, 256–257, 256F gene homologies, 20 see also Globin genes iron coordination, 166, 166F structure, 144F, 166F, 256–257 globin chains, 256–257, 256F heme groups see Heme groups see also Globin(s) subunit interactions, 142–143, 143F Hemolysin, Listeria monocytogenes, 1511–1512 Hemophilia, mutations, 348F Hemopoiesis, 1450–1463 bone marrow, 1453–1456 cell death in, 1462 commitment, in, 1456–1458 see alsoTransit alsoTransit amplifying cells control, 1454 by apoptosis, 1462 by colony-stimulating factors, 1459–1461 multiple control points, 1461F

see also Centromere(s) dynamics, 220 gene expression regulation, 366, 445, 452–453 gene silencing, 220, 221F position effects and position effect variegation, 221, 221F X-inactivation, 285 see also Gene silencing; Insulator elements heritability, 221, 221F histone modification, 238–239 multiple forms, 238–239, 238F organization, 220–222 replication, 285 short tandem repeats, 547F X-inactivation, 474–475 Heterochromatin protein 1 (HP1), 238 Heterochronic genes, 1326–1327, 1326F Heteroduplex joints, 305F, 306, 324, 325F Heteroduplex, meiotic recombination, 314, 314F Heterogeneous nuclear ribonucleoproteins, 353F, 358 Heterophilic binding, 1146 homophilic vs., 1138F Heterotypic membrane fusion, 768 Heterozygote, definition, 554F Hexokinase, 120F, 159 Hexoses, 112F High-density protein arrays, protein–protein interactions, 523 High-mannose oligosaccharide(s), 774, 774F High-performance liquid chromatography (HPLC), 513 Hinge region, antibody molecule, 1552, 1553F Hippocampus, glutamate receptors, 691–692 HIS gene, Saccharomyces cerevisiae, 285F Histamine, 804, 1556

lineage diagram (scheme), 1457F from multipotent stem cells, 1456 see also Erythropoiesis; Hemopoietic stem cells Hemopoietic cells, 1461–1462 Hemopoietic stem cells, 1450–1463 in bone marrow, 1454–1462 cell-surface markers, 1456 commitment, 1456–1458 dependence on stromal cell contact, 1458–1459, 1458F division rate, 1458 gene therapy potential, 1456 pluripotent, lymphocyte origin, 1543 rescue of irradiated individuals, 1456 self-renewal, 1458 see also Hemopoiesis Hemopoietic tissues, origin of lymphocytes, 1543 Hemorrhagic fever, viral, 1502 Heparan sulfate, 881, 1183 Hepatitis, 1505 Hepatitis B infection, liver cancer causation, 1227–1228, 1227T Hepatitis virus(es) chronic illness, 1500 liver cancer and, 1227–1228 receptors, 1505 Hepatocyte(s), 1442, 1443–1444 electron micrograph, 698F glucocorticoid-mediated gene expression, 412, 415, 463 organelles, membrane amounts, 697T smooth endoplasmic reticulum, 725 Hepatocyte growth factor (HGF), 1443 Her2 protein, in cancer therapy, 1260 Hereditary nonpolyposis colorectal cancer (HNPCC), 277, 1254 Heredity, 195 defining feature of life, 1 see also Inheritance Hermaphrodite, C. elegans, 1321 Herpes simplex virus (HSV), 1487–1488, 1496 MHC class I protein translocation inhibition, 1535–1536 receptors, 1505 Herpes virus(es), 1496F assembly, 1514F envelope acquisition, 1514F microtubule-based movement in axons, 1516–1517, 1516F Hes1 gene, 1371 Heterocaryon(s), 509F, 643, 643F Heterochromatin, 220–222, 238–239, 1070 biological functions, 220–221

mast cells, 1557F release, 804, 804F secretion, 804, 804F, 1557F Histidine, 128F, 548 Histidine-kinase-associated receptors, 922, 941–942

Histochemical staining, 554–555, 579, 585F Histocompatibility molecule, 1575 see also MHC (major histocompatibility complex) Histology airways, 1434–1436 blood vessels, 1445–1450 endothelial cells, 1445–1450 epidermis, 1417–1428 gut, 1436–1444 liver, 1442–1444 sensory epithelia, 1429–1433 Histone(s), 211–216 addition to DNA (postreplication), 290 analysis, 211F, 212F evolutionary conservation, 213 fold, 212, 213F genes, 289 histone octamer, 211, 212 assembly, 212, 214F identification, 212F S phase, 1070 inheritance following replication, 290–291, 291F in vitro mutagenesis, 213 modification see Histone modification mutations, 213 protein–DNA interactions, 212–213 structure, 212, 213, 213F 213F,, 214F synthesis in S phase, 289–290 variants, 224, 224F see also indiv individual idual histones histones Histone acetyltransferases (HAT (HATs), s), 222, 343, 343F Histone chaperones see Chromatin assembly factors (CAFs) Histone code hypothesis, 224–226, 226F Histone deacetylases (HDACs), 222, 446F Histone H1, 218, 218F Histone H2A, 211 H2B dimer, 290 interactions, 212, 214F modifications, 216F variants, 224F, 474–475 Histone H2B, 211 H2A dimer, 290 interactions, 212, 214F modifications, 216F Histone H3, 211 centromere-specific variant CENP-A, 231–232,


centromeric (centric), 220


Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



H4 tetramer, 290–291 histone code hypothesis, 225, 225F interactions, 212, 214F modifications, 187, 187F 187F,, 226, 226F 226F,, 290–291, 291F variants, 224F, 475 Histone H4, 211 evolutionary conservation, 213, 265 H3 tetramer, 290–291 interactions, 212, 214F, 217–218, 218F modifications, 290–291, 291F variants, X-inactivation, 475 Histone modification, 222–224, 223F acetylation/deacetylation, 290 amino acid side chains, 222, 222F chromatin immunoprecipitation analysis, 432, 432F chromatin remodeling, 432, 433F functional roles epigenetic, 472, 472F histone code hypothesis, 224–226, 226F transcriptional, 343 histone acetyl transferases (HAT (HATs), s), 222, 343, 343F histone deactylase complexes (HDACs), 222, 446F histone tail modification, 222, 223F polytene chromosomes, 238F Histoplasma capsulatum, 1494, 1494F HIV (human immunodeficiency virus), 1496F, 1581 cancer and, 1228T cell entry and uncoating, 764–765, 765F, 1505–1506, 1506F, 1507 multivesicular bodies, 797 chemokine receptor binding, 765F co-receptors, 1505–1506, 1505F drug resistance, 1521

Drosophila, 1342, 1342F Homing receptors, lymphocytes, 1550 Homologous chromosomes (homologs), 202, 1090, 1271 axial cores, 1275 meiotic pairing, 1091–1092, 1271, 1273–1274, 1274–1275, 1274F, 1276F bivalent formation, 1274, 1274F 1274F,, 1276F double strand breaks, 1275, 1280 genetic diversity and, 1271, 1279–1280, 1279F morphological changes, 1275 nondisjunction, 1236F, 1278–1279 pairing sites, 1274 sex chromosomes, 1275 synapsis, 1275, 1276F synaptonemal complex, 1274F 1274F,, 1275–1276, 1275F telomeres and, 1274, 1274F transverse filaments, 1276, 1277F see also Homologous recombination (crossing-over) meiotic segregation, 1276–1278, 1277F nondisjunction, 1236F, 1278–1279 Homologous end-joining, DNA double-strand break repair, 303 Homologous genes, 20–21, 20F, 21F Homologous recombination (crossing-over),

fusion peptide, 1507 1521 genome, 485F, 1498F, life cycle, 321F, 486, 486F microtubule-based movement in axons, 1517 mutation rate, 1520–1521 Nef protein, 485F receptors, 1505–1506, 1505F regulated nuclear transpor t, 443FF, 485–486, 485F, 486F reverse transcriptase structure, 321F Rev protein, 443F, 485–486, 485F, 486F Rev responsive element (RRE), 485, 485F, 486F Tat protein, 478, 485F transcription attenuation, 478 translational frameshifting, 383, 384F vaccine development, 1521 see also speci specific fic types HIV-1, 1521, 1521F HIV-2, diversification and origin, 1521F HLA (human-leucocyte-associated) antigen see MHC (major histocompatibility complex) HLA-DM protein, 1406 HNPCC see Hereditary nonpolyposis colorectal cancer (HNPCC) hnRNPs, 353F, 358 Holliday junctions, 311, 312F double branch migration, 312, 312F gene conversion, 311, 314–315 isomerization, 311F Homeobox genes see Homeotic (homeobox) genes Homeodomain DNA-binding motifs, 420–421, 421F see also Homeodomain proteins Homeodomain proteins, 420–421 DNA-binding, 420–421, 421F, 426–432, 430F evolutionary conservation, 138F, 420–421 heterodimerization, 425F homologies, 138, 138F, 421 isolation, 429 plants, 1399 Wuschel, 1410F Homeotic (homeobox) genes, 420, 1338F,

regulation, 310–311 “repair factories, ” 310, 310F evolutionary benefit, 305 genetic exchange/assortment, 305, 1348 see also meiotic recombination recombination (below) mechanism base-flipping, 307F base-pairing, 305–306 branch migration, 307F, 308, 308F heteroduplex joints, 306, 308 Holliday junctions see Holliday junctions hybridization (synapsis), models, 306F strand invasion, 306 meiotic recombination, 305F, 312–314, 1092, 1092F, 1271, 1274–1275, 1274F, 1280F chiasma formation, 1274, 1274F, 1276, 1276F crossover control, 314 crossover interference, 1280 double Holliday junction, 312, 313F double-strand breaks, 305F, 312 gene conversion, 314 genetic diversity and, 1271, 1279–1280, 1279F heteroduplex, 314, 314F hot spots and cold spots, 1280 non-crossovers, 313–314 recombination complex, 1275, 1280 regulation, 314, 1280 Spo11, 1280 proteins, 312F RecA, 306–307, 307–308, 307F strand exchange see Holliday junctions strand invasion, 305 see also Linkage analysis; Meiosis Homology, 20F, 246 Homophilic adhesion, 1137–1139 heterophilic vs., 1138F Homo sapiens sapiens see Humans (Homo sapiens) Homotypic membrane fusion, 768, 769F Homozygote, definition, 554F Homunculus, 1391 Horizontal gene transfer, 19F, 19F, 21–22 antigenic variation, 1520 evolutionary innovation, 19 Hormones, 882 gene expression regulation, 412, 415, 463, 463F see also individual hormones Host behavior, modification to facilitate pathogen spread, 1518 Host cells invasion by pathogens, 1501, 1504–1505 bacteria, 1507–1511, 1508F, 1509F evasion of defenses, 1502–1504


chromosomal ordering in Hox complexes, 1343–1344 Drosophila Drosop hila see Drosop Drosophila hila melanogaster melanogaster homeotic genes family members in different eucaryotes, 1400T flower development, 1413–1414, 1414F Hox complex see Hox complex see also Homeodomain proteins; Hox genes Homeotic mutation


biological functions, 304–305, 305F common features, 305 control via mismatch correction, 315F double-strand break repair, 302–303, 303F, 304–305, 305F, 308–309, 309F defects, 295T heterozygosity loss, 310

viruses, 1505, 1506F membrane traffic and pathogen strategies, 1511–1514 , 1511F response to pathogens, 1488 transcription shut-down, 1517 virus-induced metabolic changes, 1517–1518 Host defenses, 1501–1502 epithelial surfaces, 1525–1526 evasion by pathogens, 1502–1504 antigenic variation, 1519–1520 Housekeeping genes, CG (CpG) islands, 434, 470 HoxB complex, expression in mouse, 1346F HOX code, anteroposterior axis determination, 1342–1346

Hox complex anteroposterior axis determination, 1342–1346 expression in mouse, 1346F expression pattern in Drosophila, 1343F insect and mammal compared, 1346F sequential gene expression, 1343–1344 Hox genes, 1345, 1355 HPLC (high-performance liquid chromatography), 513 HS4 protein, 227–228 hsp40 proteins, 390F Hsp60 protein, 388, 389 Hsp60 protein, mitochondrial protein import, 717 Hsp70 protein, 388, 389, 390F Hsp70 protein, mitochondrial protein transport, 715, 716F, 717 HTH motif see Helix–turn–helix motif Human accelerated regions (HARs), 253 Human genetics, 556 Human genome, 205–206, 206T chromosomes, 202, 203FF chromosome 12 translocation, 204F chromosome 22, 205F, 206T gene organization, 205F replication origins, 287–288 replication rate, 283 t-loop, 293F complexity, 142, 205–206 composition, 207F Alu elements, 323F mobile elements, 207F, 318T, 323 see also Mobile genetic elements see also Noncoding DNA genes, 142, 206T regulatory, 206 size, 206 structure, 205–207, 205F, 206, 206T see also Gene structure genomic DNA library, 541, 542F individual variation, 41 mitochondrial, 861–862, 861F nonretroviral-like retrotransposons, 321–322 phylogeny reconstruction, 248F, 251F scale, 206F, 206T, 209F sequencing, 142, 205–206 comparative, 207, 247, 247F, 248F Human Genome Project, 205–206, 206, 532 size, 18T Human Genome Project, 205–206, 206, 532 see also Human genome Human immunodeficiency virus see HIV Human papillomavirus, cervical cancer, 1499 Humans (Homo sapiens) genome see Human genome as model organism, 40 in tree of life, 16F Humoral immune response, 1552–1568 see also B cell(s); Immunoglobulin(s) Hunchback protein, eve gene activation, 448–450, 449F Hunter’s disease, 785 Huntingtin, sequence comparisons, 251F Huntington’s disease, 397, 560 Hurler’s disease, 785 Hyaluronan (hyaluronic acid; hyaluronate), 1179, 1180–1181, 1180F Hyaluronidase, 1181 Hybrid cells hybridomas see Hybridomas production, 509F Hybridization, DNA see DNA hybridization Hybridomas, 508–509, 509F Hydra, asexual reproduction, 1269, 1269F Hydride ions, electron carriers, 82 Hydrocarbon(s), 106F, 623, 623F

Arabidopsis, 1413F

intracellular parasites, 1508 1511

Hydrogenation reactions, 71F, 72


Hydrogen, atomic structure, 46F Hydrogen bonds, 54, 108F 108F,, 110F aquaporin(s), 675 ball and stick model, 54F bond length/strength, 53T DNA structure, 197–198, 198F 198F,, 199F, 417 protein–DNA interactions, 417, 417F protein folding, 130F protein–ligand binding, 153, 154, 154F protein structure, 126, 127, 130F in water, 108F, 110F Hydrogen ion (H+, proton) acids, 52 exchange, 109F gradients to drive ATP synthesis, 100F intracellular ion concentration, 596 movement, 827–828, 835, 835F see also Electrochemical proton gradients; Proton pumps pH measurement, 596 water, 828, 828F Hydrogen ion pump (H+ pump) see Proton pumps Hydrogen peroxide, peroxisomes, 721 Hydrolysis, 85F ATP see ATP hydrolysis macromolecules, energetics, 84–87 nucleotide see Nucleotide(s),hydrolysis sugars, 56, 57F, 164–165 Hydrolytic editing, aminoacyl-tRNA synthetases, 372, 372F Hydronium ion, 52, 53, 109F, 828F Hydropathy plots, transmembrane protein(s), 632, 633F Hydrophilic molecules, 52, 108F, 618, 620, 621F see also Water Hydrophobic chromatography, 512

primary vs secondary, 1546 see also B cell(s); Immunoglobulin(s); T cell(s) innate, 1485, 1524–1537, 1539, 1540FF adaptive vs., 1539, 1540FF elicitors, 1526–1527, 1527 evolution, 1524, 1531 function, 1524 recognition of pathogens, 1526–1528 response to viruses, 1534–1536 Toll-like receptors role, 1530 see also Phagocytosis Immunoblotting, 518, 519F Immunoglobulin a (Iga), 1599F Immunoglobulin b (Igb), 1599F Immunoglobulin(s), 1540, 1552–1561, 1552–1568, 1552F, 1554F, 1557T affinity, 1558 applications cell separation techniques, 502 FACS, 502, 503F fluorescent labeling, 502, 588 immunoelectron microscopy, 606–607, 607F immunofluorescence microscopy, 587F 587F,,

Hydrophobic 111F, 381 Hydrophobic interactions, molecules, 52, 108F, 618, 620, 621F proteins, 390–391 see also Water Hydrothermal vents, 12, 13FF Hydroxyl ion, 109F Hydroxylysines, collagens, 1186, 1187F Hydroxyprolines, 1186, 1187F, 1190 5-Hydroxytryptamine (5-HT) see Serotonin (5-hydroxytryptamine, 5-HT) Hypervariable region, antibody, 1560–1561 Hypodermis (subcutaneous layer), 1418, 1418F Hypopigmentation (albinism), 786 Hypothalamus, circadian clock, 461 Hypoxanthine, 300, 301F Hypoxia, angiogenesis activation, 1221 Hypoxia-inducible factor 1 (HIF1), 1221, 1448–1449

post-transcriptional regulation, 370 segments, 1562, 1563 , 1563FF, 1564–1565 immunoglobulin a (Iga), 1599F immunoglobulin b (Igb), 1599F membrane-bound form, 1557 monoclonal see Monoclonal antibodies responses, 1540, 1540F primary and secondary, 588, 1546F see also speci specific fic types structure, 156, 157F 157F,, 1558–1559, 1558F, 1559F, 1560F binding sites see Antigen-binding site gene-segment pool, 1563F heavy (H) chain see Heavy (H) chain (antibodies) hinge region, 1552, 1553F, 1554F hypervariable region, 157F 157F,, 1559, 1559F 1559F,,


immunoprecipitation, 431–432, 432F microinjection, 597, 598F monoclonal antibodies, 509 avidity, 1558 classes, 1553–1557, 1557T see also speci specific fic types class switching see Class switching diversification, 1562–1569, 1568F evolution, exon recombination, 257F genes gene-pool selection, B cell development, 1566F


I ICAMs see Intercellular cell adhesion molecules (ICAMs) IFNs see Interferon(s) IgA see Immunoglobulin A (IgA) IgD see Immunoglobulin D (IgD) IgE see Immunoglobulin E (IgE) IgG see Immunoglobulin G (IgG) IgM see Immunoglobulin M (IgM) IHog protein, 950 IkB kinase (IKK), 953 IkB protein, 953 ILs see Interleukin(s) Image processing electron microscopy, 610–612 light microscopy, 583–584, 584F Imaginal discs, 1349–1351 growth control, 1353–1354 wing imaginal disc, 1356F Imago, 1329 Immature naive B cell, 1553 Immediate early gene(s), 929 Immortal cell lines/immortalization, 504F, 506T, 1059 see also Cell cycle control Immortal strand hypothesis, 1424–1426, 1425F Immune complexes, 1553F Immune response/system adaptive, 1541–1542, 1542F, 1545 cell-mediated vs antibody, 1540, 1540F complement system see Complement system innate vs., 1539, 1540FF MHC proteins see MHC (major

Ig domains, 1559, 1559F 1559F,, 1560F immunoglobulin fold, 140F light (L) chains see Light (L) chain (antibodies) paired domains, 141 tail (Fc) region, 1552F, 1554F, 1555, 1555F, 1559 synthesis in endoplasmic reticulum, 768F in vitro via hybridomas, 508–509, 509F see also B cell(s) Immunoglobulin A (IgA), 1556, 1556FF, 1557T class switching, 1567 heavy chain, 1553 Immunoglobulin D (IgD), 1557T B-cell development, 1553 class switching, 1567 heavy chain, 1553 Immunoglobulin E (IgE), 1556, 1557T allergic reactions, 1557F class switching, 1567 heavy chain, 1553 histamine secretion, 1557F Immunoglobulin fold, 140F Immunoglobulin G (IgG), 1553, 1554–1556, 1557T, 1559F, 1560F class switching, 1567 structure, 1561F Immunoglobulin-like domain, 1560F, 1599 Immunoglobulin M (IgM), 1553–1554, 1555F, 1557T class switching, 1567, 1568F complement activation, 1554 transmembrane, 1599F Immunoglobulin superfamily, 1560, 1599–1600, 1599F


b2 integrin ligands, 1174 cell adhesion, 1145, 1146–1147, 1177T synapse formation and, 1147–1148 evolution, 257F immunoglobulin fold, 140 structures, 1147F see also Immunoglobulin(s); specific members Immunogold electron microscopy, 606–607, 607FF Immunological memory, 1546, 1546F Immunological synapse, 1573, 1591 B cells/helper T cells, 1597T signal-relaying junctions, 1132 Immunological tolerance, 1547–1549 acquired, 1546F, 1547, 1547, 1547F autimmune regulator (AIRE) protein, 1588 clonal deletion, 1548, 1548F nonactivated dendritic cells, 1571 peripheral, 1587–1588 receptor editing, 1548, 1548F self, 1548F Immunoprecipitation, 432, 432F, 458 Immunostimulants, pathogen-associated, 1526–1527, 1527 Immunosuppression, tuberculosis, 1488 Imprinting see Genomic imprinting Inclusion-cell disease (I-cell disease), 785–786 Indian Hedgehog protein, 950 Indirect immunofluorescence, 587F, 588, 588F Induced proximityy, 185–186 Induced somatic recombination, 1348, 1349F Inducible promoters, 564 Inductive signals, in development, 1313 gastrulation role, 1368F sequential, 1319–1320 see also speci specific fic signals Infection(s) 1227 as cellcarcinogens, biology, 1501–1524 chronic diseases, 1499–1500 intracellular pathogens see Intracellular pathogens response to see Host defenses; Immune response/system route, 1501–1502 signs/symptoms, 1487–1488 see also specific infections/organisms Infectious mononucleosis, 1499 Infertility, 1301 Inflammation/inflammatory response, 1526, 1527, 1533–1534, 1534F proteoglycans and, 1183 Inflammatory mediators, 1533–1534 Influenza virus(es), 1496F 1496F,, 1521 cell entry, 765 entry and uncoating, 1506F 1506F,, 1507 microtubule-based movement in axons, 1517 pandemics, 1521, 1522F Influx transporter proteins, auxin transport, 959 Information transmission defining property of life, 1 energetics, 8 molecules DNA see DNA (deoxyribonucleic acid) origin of life, 401, 402–403, 402F RNA see RNA (ribonucleic acid) quantification, 1 see also Inheritance Inheritance, 1, 195 epigenetic, 291, 702, 704 chromatin structure, 230–234, 232F 232F,, 473–476 DNA methylation, 467–468, 467F histone modifications, 290–291, 291F information transmission, 1–5 non-Mendelian, 864–865, 865F chloroplast(s), 866, 866F maternal, 866 ‘Protein-only inheritance,’ yeast, 398, 398F Inherited spinal muscular atrophy, SMN protein mutation, 364–365 Inhibitors of apoptosis (IAPs), 1124–1125 Inhibitory G protein (Gi), 906–907 Inhibitory postsynaptic potential (IPSP), 688 Initiation codon, 367F, 380, 489–491 Initiation complex, transcriptional, 341 Initiation factors (eucaryotic) see eIFs (eucaryotic initiation factors) Initiator tRNA, 380 Innate immune response see Immune response/system, innate

histocompatibility complex)

alternative splicing, 1146–1147

Innexins, 1159

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



Inosine, 369, 369F, 484, 484F Inositol 1, 4, 5-triphosphate (IP 3), 910, 910F, 911FF egg activation role, 1299 membranes, 910 Inositol phospholipid(s), 624, 627F, 757, 757F, 910F, 933

cellular location, 758F phosphatidylinositol (PI), 743, 910F phosphatidylinositol 4, 5-bisphosphate [PI(4, 5)P2], 909, 910F, 911F phosphoinositide 3-kinase, in cancer, 1244 retromers, 756 signaling pathway, 909–911, 910F, 911FF see also Phospholipase C see also speci specific fic types Input–output devices (“microchips”), protein kinases, 177–178, 177F, 179F Insect(s) as vectors for microbial pathogens, 1501–1502 see also Drosop Drosophila hila melanogaster melanogaster Insertional mutagenesis, 528F, 556 see alsoTransposon(s) alsoTransposon(s) In situ hybridization (ISH), 572–573, 573F fluorescence (FISH), chromosome puffs, 239 Instars, 1329 Insulator-binding proteins, 452–453, 453F Insulator elements, 452–453, 452F, 453, 453F Insulin, 144F proteolytic cleavage, 151, 152F receptor, 798, 798F, 923F, 923T, 924 secretion (b cells), 1444, 1444F Insulin-like growth factor-1 (IGF-1), 923T, 924, 934 receptor, 923F, 924 Insulin-like growth factor-2 (IGF-2), imprinting, 469–470, 470F Integra (skin substitute), 1477 Integrase, lambda318T integrase, 324, 325F Integrin(s), 1169–1178, 1173T, 1177T actin linkage, 1170, 1170F adhesion junctions, 1134, 1145 allosteric regulation, 1171–1172, 1172F b1 integrins, 1173, 1422, 1422F b2 integrins, 1174 b3 integrins, 1174 bacterial invasion and, 1508 bi-directional signaling, 1169 cell migration and, 1170–1171 cell proliferation and survival, anchorage dependence, 1175–1176 , 1175F clustering and strong adhesions, 1174–1175 counterreceptors, 1174 diversity of function, 1172–1174, 1173T, 1174F fibronectin binding, 1193 fibronectin fibril assembly, 1192 heterophiilic binding, 1146 inside-out activation, 1172 intracellular signaling, 1172, 1176–1177, 1176F in mammary gland, 1428 mutation and genetic disease, 1172–1174 outside-in activation, 1172 structure, 1170–1172, 1170F, 1172F tension effects, 1169, 1171, 1171F Interaction domain(s), cell signaling, 897 Intercalary regeneration, 1354, 1354F Intercellular cell adhesion molecules (ICAMs), 411, 1146, 1592T Intercellular gene transfer see Horizontal gene transfer Interchromatin granule clusters (speckles), 241, 241F, 363–364, 365F Interdigitated solenoid model, chromatin structure, 217, 217F Interference effects, 581, 582F Interferon(s) interferon-a (IFNa), 1534–1535 interferon-b (IFNb), 1534–1535, 1536 interferon-g(IFNg) cytotoxic T-cells, effects on, 1592 T-cell development, 1582 TH1 cell secretion, 1592, 1595F, 1598T viral infections, effects on, 1406F Interfollicular epidermis, 1418–1419 Interleukin(s), 1591F, 1598T receptors, 1591F see also specific interleukins Interleukin-1-converting enzyme (ICE), 1118 Interleukin-2 (IL2), 1591, 1591F Interleukin-2 receptor, 1591F

Interleukin-4 (IL4), 1593, 1593F, 1593F, 1598, 1598T Interleukin-5 (IL5), 1593, 1598T Interleukin-10 (IL10), 1575, 1593, 1598T Interleukin-12 (I L12), 1593F, 1594, 1595F, 1595F, 1598T Interleukin-13 (IL13), 1593 Interleukin-17 (IL17), 1594 Intermediate compartment seeCis Golgi network (CGN) Intermediate filament(s) anchoring junction attachment, 1133T, 1134, 1143, 1144, 1144F 1144F,, 1171F see also Desmosome(s) assembly, 145, 984, 984F cellular location, 966 dynamic behavior, 966 elongated, 972F global distribution, 983 isoforms, 985 keratins see Keratin(s) lateral bundling and twisting of coiled coils, 983–985, 984FF mechanical stability, 985–987 organization, 1005–1006 polypeptide structure, 984 properties, 965 role in cell division, 966–967 structure, 968, 968F, 983F subunits, 971 Internal membranes, 26 Internal ribosome entry sites (IRESs), 491, 491F, 1517 Interneurons, 1386F Internode (plant stem), 1398F, 1407 Interphase, 1055 chromosomes see Interphase chromosome(s) microtubule dynamics, 1080

seeTyrosine tyrosine residues see Tyrosine kinase(s) see also Protein kinase(s) positive feedback, 901F second messengers, 893 signal enhancement, 897 signaling complexes, 897, 898F signaling proteins, 893, 894F, 897–899 see also Signaling molecule(s)/pathway(s); specific molecules signal integration, 897F threshold-like response, 900–901, 901F seeTyrosine tyrosine phosphorylation see Tyrosine kinase(s) see also Signal transduction; specific molecules/pathways Intracellular transport GFP-fusion protein studies, 753F membrane-enclosed organelles, 1021–1022 see also Cytoskeleton; Motor protein(s) Intracytoplasmic sperm injection (ICSI), 1302, 1302F Intragenic mutation(s), 18, 19F Intron(s) evolution, 348 fate signals, 358 gene structure, 206 group I, 334, 356, 356F group II, 356, 356F human genes, 205F, 206, 206T length variation, 349, 352, 353F optional, 863 organellar, 863 protein evolution role, 257 removal by RNA splicing, 345–346, 347–348 order, 352–353, 353F splicing signals see Splicing signals see also Splicing sequence ambiguity, 480

stress fibers, 1093 Interphase chromosome(s), 208F, 209 chromatin organization, 236F, 243 see also Heterochromatin histone modifications, 238, 238F lampbrush chromosomes, 234, 234F 234F,, 235F, 1288 looping, 234–236, 235F polyteny, 236–238 see also Cell cycle; Chromosome structure; Polytene chromosome(s) Interpolar microtubules, 1075, 1076F, 1079 Intervening (DNA) sequences see Intron(s) Intestinal defenses, against pathogens, 1526F Intracellular compartments, 695–748, 696F endocytic pathway, 751F maintenance, 750–766 see also Organelle(s) Intracellular ion concentration(s), 596, 597F, 652T Intracellular movement, bacteria and viruses,

Intron–exon 538F Intron–exon mapping, recognition, 551 Invariant chain, 1584, 1596F Invariant pocket, MHC protein, 1577–1578, 1579F Invasin, 1508 Inversion(s), genome evolution, 246–247 Inverted repeats, DNA-only transposons, 318T, 319F In vitro, definition, 503–504 In vitro fertilization (IVF) and related procedures, 1297, 1301–1303, 1302F In vitro mutagenesis, 213, 575 In vitro RNA selection exper iments, 404F, 408 In vivo, definition, 503–504 Involucrin, 1419 Ion(s), 47 concentration, 596, 597F, 652T see also Electrochemical proton gradients membrane channels see Ion channel(s) see also speci specific fic ions Ion channel(s), 667–692 abundancy, 668 conformational changes, 668F cyclic-nucleotide-gated, 916 families, 692T function, 667, 668 gating, 668, 668F, 1431, 1431F ligand-gated see Ligand-gated ion channel(s) mutations, 682 patch-clamp recordings, 651F 651F,, 680–682, 681FF selectivity, 667–669 transport efficiency, 667 voltage-gated, 676–678 see also indiv individual idual types Ion channels, Cyclic-nucleotide-gated, 917 Ion-exchange chromatography, 512, 514F matrices, 534F protein purification, 535F Ionic bonds, 47, 111F aqueous solutions, 111F bond length/strength, 53T covalent bonds vs., 48F protein folding, 130F Ionizing radiation, DNA-damaging agents, 300–301 see also Ultraviolet (UV) radiation Ionotropic receptors see Ion channel(s) Ion-sensitive indicators, 596, 597F IP3 see Inositol 1,4,5-triphosphate (IP3) IRESs see Internal ribosome entry sites (IRESs) Iron–copper center, cytochrome oxidase complex, 832–834 Iron, endocytic uptake, 794 Iron–sulfur center, 830F, 831, 852 Iron–sulfur proteins, 830F 830F,, 831


Intracellular pathogens, 1504–1505 entry/exit from host cells, 1504–1505, 1512F movement using actin polymerization, 1515–1516 parasites, invasion of host cells, 1508–1511 strategies against host membrane traffic, 1511–1514, 1511F escape from phagolysosome, 1511–1512, 1511F lysosomal fusion prevention, 1511F, 1512 modification by bacteria, 1512, 1512F modification by viruses, 1513–1514, 1514F survival in phagolysosome, 1511F, 1511F, 1513 Intracellular processes manipulation, 598–599 visualization electroporation, 598, 598F GFP, 592–593 see also Green fluorescent protein (GFP) ion concentration, 596–597, 597F microinjection, 597–598, 598F radioisotopic tracing, 602–603 see also Radioisotopes see also Fluorescent dyes Intracellular receptors see Nuclear hormone receptor(s); Receptor(s),intracellular Intracellular signal molecule(s)/pathway(s), 880F, 880F, 893–899, 894F input–output devices, 177–178 see also Protein kinase(s) integrins, 1172, 1176–1177, 1176F mitogens, 1103 phosphorylation

Interleukin-3 (IL3), 1460, 1460T, 1461F

cf GTP-binding, 180F

IS1 transposons, 318T


Isletgene, Islet gene, 1385 Islets of Langerhans, 1444, 1444F Isocitrate, 122F, 123F Isocitrate dehydrogenase, 123F Isoelectric focusing, 2D-PAGE, 521, 521F, 521F, 522F Isoleucine, structure, 129F Isomers, 56 amino acids, 128F sugars, 112F Isotopes, 601, 601T radioactive see Radioisotopes Izumo protein, 1298

J Jak (Janus kinase), 937–939 Jak-STAT signaling pathway, 937–939, 938F, 939T Janus kinase (Jak), 937–939 J (joining) chain IgA, 1556F IgM, 1554, 1555F Joint molecules (recombination) conservative site-specific recombination, 324, 325F synapsis, 305F Junctional complexes, 1153, 1154F cell proliferation and, 1153–1155 organization, 1148–1149, 1148F, 1149F see also Scaffold protein(s) Junctional diversification, antibody gene segment joining, 1564–1565 Junctional epidermolysis bullosa, 1165 Junk DNA, 204, 860 see also Noncoding DNA

K Kaposi’s sarcoma, 1228, 1228T Kartagener’s syndrome, 1033 Karyotype, 203 analysis, 203FF human, 203F muntjac deer, 204F, 205F see also Mitotic chromosome(s) Katanin, 770, 995F, 1000, 1001F KDEL sequence, ER retrieval pathway, 770 Keratan sulfate, 1179 Keratin(s), 985–986, 985T, 986F a-keratin, 145 Keratin filaments, epidermal prickle cells, 1419, 1419F Keratinocytes, 1038F, 1418F, 1419 control of differentiation in culture, 1422, 1426 migratory, 1037, 1037F a-Ketoglutarate, 99, 122F, 123F a-Ketoglutarate dehydrogenase complex, 123F Ketoses, monosaccharides, 112F Kidney glomerulus, basal lamina, 1164–1165, 1164F, 1167 Kinases see Protein kinase(s) Kinesin(s), 527, 1014, 1014F ATP hydrolysis, 1018F axonal transport, 1021 central core and force generation, 1016 evolutionary origin, 1015–1016 force generation, 1016–1019 linker region, 1016 mechanochemical cycles, 1016–1017, 1018F microtubule-binding site, 1014, 1014F microtubule disassembly, 995F mitotic spindles, 1034, 1077, 1079, 1082F movement speed, 1020 processivity, 1020 structure, 1014F see also individual kinesins Kinesin-related proteins (KRPs), 1014, 1014F Kinesin superfamily see Kinesin(s); Kinesin-related proteins (KRPs); Motor protein(s) Kinetics enzyme catalysis see Enzyme kinetics motor proteins, 1020–1021 Kinetochore(s), 210, 1076F 1076F,, 1082–1083 bipolarity, 1075–1076, 1076F meiosis I, 1277–1278 microtubules attachment, 1082, 1083F 1083F,, 1084F forces acting on, 1085–1087, 1085F, 1086F, 1086F,


L1 elements see LINE (L1) elements Labeling index, 1059 Lacoperon Lac operon (Escherichia coli), 9F, 416, 418T DNA looping, 438 lacgene lac gene regulation, 9F, 436F CAP activation, 418T, 420F, 436 lac repressor see Lac repressor mutations, 264 two-signal switching, 436F see also Repressor protein(s) Lac repressor, 9F, 416, 418T discovery, 416 DNA sequence recognition, 418T synthetic biology, 461F see also Repressor protein(s)

proteolysis, 946–954 Lateral diffusion (membrane proteins), 643, 646F Lateral inhibition Delta–Notch signaling, 946–947, 947F Drosophila sensory bristle development, 1357–1358 Wnt-Notch signaling, 1439–1440, 1439F Latrunculin, 987, 988T Lck, 1581, 1590F see also Src family of protein tyrosine kinases LCRs see Locus control region(s) LDL-receptor-related protein (LRP), 949, 949F LDLs see Low-density lipoproteins (LDLs) Leading strand synthesis (DNA replication), 267, 267F, 268, 268F, 269F, 271–273, 271F, 276F Leaky scanning, 490 Lectin(s), 1145 complement activation, 1529 glycocalyx interaction, 636 mannan-binding, 1529 trans-Golgi trans -Golgi network, 808 Lectin complement activation pathway, 1529 Leeuwenhoek, Anton van, 501, 501F LEF1/TCF gene regulatory proteins, 950 Left-right asymmetry development, 1376–1377 Lefty1 gene, 1377 Legionella pneumophilia invasion of host cells, 1508, 1508F strategy against host membrane traffic, 1511F, 1512–1513, 1512F transmission, 1508 Legionnaire’s disease, 1508 Leishmaniasis, 1488 Lens(es) electron microscope, 604

Lactate production, see also Glycolysis90 Lactation, 1427–1428, 1427F Lactose permease, 657, 658F Lagging strand synthesis (DNA replication), 268, 269F, 272F, 276F end-replication problem, 292 see alsoTelomerase alsoTelomerase eucaryotic, 280, 281F ligation, 272 Okazaki fragments, 267–268, 269F, 269F, 272, 281F RNA primers, 272, 272F Lakritz mutant, 556 Lambda bacteriophage see Bacteriophage lambda Lambda repressor, 457–458, 458F DNA sequence recognition, 418T gene regulatory protein, 416 helix-turn-helix motif, 420F synthetic biology, 461F Lamellipodia, 1037 actin filament nucleation, 996 actin gels, 1008 cell adhesion, 1040 cell crawling, 1008, 1036F cofilin in, 1038F growth cones, 1040F, 1049 movement mechanism, 1037–1038 organization cf. mitotic spindle, 1039 ruffling at leading edge, 1040F, 1041 web formation by ARP complex, 1038, 1038F Laminin(s) basal lamina, 1165–1166 collagen binding, 1166–1167, 1167F epithelial apico-basal polarity, 1155F isoforms, 1166 laminin-1 (classical laminin), 1165–1166 mutations, 1167 neuronal guidance role, 1388 NMJ, 1168 structure, 1166F Lampbrush chromosomes, 234, 234F, 235F, 1288 Langerhans cell see Dendritic cells Lariat structure, pre-mRNA splicing, 347, 348F, 350F Larva (Drosophila), 1329, 1343F extended germ band, 1330F imaginal discs, 1349, 1350F Laser capture microdissection, 502, 503F Laser tweezers, 599, 599F Late genes, chromatin condensation effect, 285–286 Latent gene regulatory proteins b-catenin, wnt signaling, 948–950, 949F NFkB, B, 952–954, 953F, 1530

light microscope, 581–582, 582F see also Light waves Lepromatous leprosy, 1593–1594 Leprosy, 1593–1594 Leptin, 1475 deficiency, 1476F function/effects, 1475–1476, 1476F gene sequence comparisons, 248F 248F,, 249F secretion from fat cells, 1475–1476 Leptogene, 1275 Let7gene, Let7 gene, 1327 Lethal mutation(s), 528F Lethal toxin, 1493 Leucine-rich repeat (LRR) proteins, 956, 956F Leucine, structure, 129F Leucine zipper proteins, 423, 424F, 425F Leucocyte(s), 1451, 1453T adhesion to endothelial cells, 1453, 1454F inflammatory response, 1453–1454, 1454F integrins, 1174 migration from capillaries, 1453–1454, 1454F structure, 1452F types, 1451–1453 Leucocyte adhesion deficiency, 1174 Leucoplasts, 841 Leukemia B lymphocyte leukemia, origin, 1219 chronic myelogenous see Chronic myelogenous leukemia (CML) DNA repair defects, 295T Lex A protein, domain fusion, 442F Leydig cells, development, 1285 LFA1 (lymphocyte-function-associated protein 1), 1592T Life, 1 autocatalytic process, 7F universal features, 1, 1–11 Ligand(s) ion channel opening see Ion channel(s) protein binding sites, 153 see also Substrate(s),enzyme binding Ligand-gated ion channel(s) ion-channel-linked receptors, 892, 893F mechanically-gated, 1431, 1431F seeTransmitter-gated neurotransmitter-gated see Transmitter-gated ion channel(s) Ligase fold, 406F Ligation DNA cloning, 540, 541F lagging strand synthesis (DNA replication), 272 see also DNA ligase(s) Light (L) chain (an tibodies), 1552–1553, 1554F, 1554F, 1556, 1557T, 1558F

mitotic, 1035F, 1076, 1076F tension, 1084, 1086 spindle assembly checkpoint, 1088 structure, 1083F Kinetochore fiber, 1084 Kin recognition, selective protein retention, 731 Kissing hairpins, RNA structure, 403F Kit protein, 1375, 1458, 1458F KKXX sequence, ER retrieval pathway, 770 Knockout animals see Gene knockouts K-Ras gene, 1251–1252, 1252T, 1255 Krebs cycle see Citric acid cycle Kringle domain, 140F, 141 Krüppelmutant, Krüppel mutant, Drosophila, 1337 Krüppel protein, 418T, 448–450, 449F Kupffer cells, 1443F Kuru, 1499F



Notch, 946–948

constant domains, 1558–1559, 1560F

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



generation of diversity, 1562–1566 repeating domains, 1559, 1560F variable domains, 1558–1559, 1560F Light energy, 69F, 598–599 see also Photosynthesis Light-harvesting complexes, 848, 848F Light microscopy, 581–583 3-D imaging, 589–590 confocal microscopy, 591, 592F image deconvolution, 590, 590F brightfield, 583 contrast generation, 583, 583F, 584, 584F darkfield, 583

g-Lipotropin, -Lipotropin, 803F Liquid chromatography, 522 Listeria monocytogenes actin-based movement, 1514, 1515F 1515F,, 1516, 1516F escape from host phagolysosome, 1511–1512, 1511F hemolysin secretion and action, 1511–1512 invasion of host cells, 1508, 1512F phagosomal membrane destruction, 1512–1513, 1512F receptors, 1508 Lithotroph(s), 12, 15, 15F

differential-interference microscopy, 583 fluorescence see Fluorescence microscopy history, 579 image processing, 583–584, 584F microscope, 581, 581F, 604F phase-contrast see Phase-contrast microscopy resolution, 580–583, 581F, 582F, 590 electron microscopy vs., 609F sample preparation, 554–555, 579, 585, 585F Light waves, 582FF contrast generation, 583F 583F,, 584F diffraction effec ts, 548, 581F, 582F, 583 phase, 580, 582F, 583 interference effects, 581–582, 582F momentum, 598–599 Lignin, plant cell wall, 1195, 1196, 1199T Limb buds (ver tebrate), 1355F, 1374F Limb regeneration, newt, 1480, 1480F Lim gene, 1385 Lin4 gene, 1326 Lin14 gene, 1326F Lineage tracing, Caenorhabditis elegans, 1322, 1322F

Liver, cancer, 1227–1228, 1229 cells see Hepatocyte(s) structure, 1443F Lkb1 gene/protein, epithelial apico-basal polarity, 1155–1156, 1156F Locus control region(s), 450–452, 452, 452F Long interspersed nuclear element see LINE (L1) elements Long-term depression (LTD), synaptic control, 691 Long-term potentiation (LTP), effect, 691, 692F Loss-of-function mutation(s), 528F 528F,, 557–558 Loss of heterozygosity (LOH), 310, 1236 Lou Gehrig’s disease, 987 Low-density lipoprotein (LDL) receptors, 791–794, 791F Low-density lipoproteins (LDLs), 791–792, 791F, 792, 793F Lox recombination element see Cre/Lox system LPS see Lipopolysaccharide (LPS) LRR (leucin-rich repeat proteins), 956, 956F L-selectin, 1145, 1550, 1550F Luminescent molecules, 596–597

LINE (L1) elements, human genome, 318T, 207F 321–322, 322F human vs. mouse genome, 323F see also Repetitive DNA Linkage analysis, 559–560 gene localization, 559–560, 560F gene mapping, 559–560, 560F see also Homologous recombination (crossingover) Linkage, protein–ligand interactions, 171–172, 172FF Linker DNA, 211 Linker region, (kinesin), 1016 Lipid(s), 58, 115F aggregates, 115F bilayer formation see Lipid bilayer(s) cell membrane(s), 617–629, 624 see also Lipid bilayer; Membrane(s) droplets, 94F, 97F, 115F, 625–626, 626F synthesis, 867 see also Fat(s); specific types Lipid anchor(s), membrane proteins, 630 Lipid bilayer(s), 9, 617–629, 618F, 625F assembly, 620–621, 622, 743–745, 744F see also Phospholipid(s) asymmetry, 626–627, 626F barrier function, 651 black membranes, 622 composition, 622–624, 624F diffusion, 622, 652 domain formation, 624–625 fluidity, 621–624, 621F fusion, SNARE proteins, 763F, 764 membrane protein association see Membrane protein(s) mobility, 622, 623F origin, 405–406, 407F permeability, 624, 631, 652 relative permeability, 652F, 653F signaling, 626 spontaneous formation, 620–621 structure, 620F, 621–622 Lipid kinase(s), 627 see also speci specific fic kinases Lipid raft(s), 625, 625F, 807, 807F assembly, 742–743, 742F caveolae formation, 790 Lipopolysaccharide (LPS), 1490F immunostimulation, 1527 macrophage activation by, 1530F structure, 1527F Liposome(s), 621–622, 622F, 625F membrane protein solubility, 638

Lung(s), 1434–1435, Luteinizing hormone1434–1436 (LH), 907T, 1292 Lyme disease, 1500 Lymphatic vessel, function, 1446 Lymph node(s), 1550, 1551F Lymphocyte(s), 1452–1453, 1453T activation, costimulatory signal, 1548 cytotoxic, apoptosis, 1120 effector cells, 1546 general principles, 1540–1551 adaptive immunity, 1540–1541 B cell development, 1543–1544 clonal selection, 1544 dependence on innate immune system,

melanocytes, 786 membranes, 697T plant vacuoles, 781–782 proton pump, 780, 780F structure, 780F transport from endosomes, 791–792, 795F 795F,, 796F from Golgi apparatus, 779–787, 783–784, 785F Trypanosoma cruziinvasion, cruzi invasion, 1511 volume, 697T yeast vacuoles, 781–782 see also Lysozyme



immunological memory, 1546 T cell development, 1543–1544 tolerance, 1548 hemopoietic stem cells, commitment to lymphoid pathway, 1456–1457 homing receptors, 1550 memory cells, 1546 naive cells, 1546 origin(s), 1541F, 1543 recirculation, 1549–1551, 1549F see also B cell(s); T cell(s) Lymphocyte-function-associated protein 1 (LFA1), 1592T Lymphocytic choriomeningitis (LCM) virus, 1496F Lymphoid follicles, 1550, 1551F Lymphoid organ(s), 1540, 1541F central, 1541F, 1543, 1543F central vs. peripheral, 1543 peripheral, 1543, 1549, 1549F 1549F,, 1553F see also Bone marrow; Lymph node(s); Thymus Lymphoma(s) Burkitt’s see Burkitt’s lymphoma DNA repair defects, 295T non-Hodgkins, metastasis, 1206F Lysine, 128F, 1186, 1187F Lysis/lysogeny, phage lambda, 458, 458F Lysosomal hydrolase, 785F, 786F Lysosomal secretion, 786 Lysosomal storage diseases, 785–786 Lysosome(s), 779–787, 780F acid hydrolases, 779–780 degradation pathways, 784F distribution, 780–781 exocytosis, 786 function, 696, 779–780 fusion with phagosomes, 1531–1532 intracellular digestion, 779–780, 784F material import, 782, 783, 783F, 784FF

Lysozyme catalysis, 161, 164–165, 164F, 165F disulfide-bonds, 148 functions, 163–164 structure, 144F, 164F see also Lysosome(s)

M M6P see Mannose-6-phosphate (M6P) Macromolecular interactions DNA–DNA interactions, 306F see also DNA hybridization enzyme–substrate interactions see Enzyme–substrate interactions hydrophobic interactions, 111F noncovalent interactions, 55F, 156, 158F protein–DNA interactions see Protein–DNA interactions protein–ligand interactions see Protein–ligand interactions see also speci specific fic methods methods Macromolecule(s) assembly, 148–152 biosynthesis, 63, 85F energy requirements, 84–87 orientation, 86, 87F cell chemistry, 62–63 abundance, 62F composition, 335–336 mammalian vs bacterial cells, 63T protein subunits, 148 cell fractionation, 510–511 interactions see Macromolecular interactions polymerisation, 56, 84–87 shape specification, 63–64, 64F subunits, 62F, 63F, 148–152 see also speci specific fic types Macrophage(s) activation, 1594–1595 helper T-cells (TH), 1575, 1593F, 1595F lipopolysaccharide, 1530F recruitment of cells, 1534 apoptosis, 1117 cell crawling, 1036 effect of NO, 888 foam cells, 1500 function, 1452 HIV infection, 1581 interleukin secretion and sensitivity, 1598T leprosy, 1593–1594 lifespan and turnover, 1460 lineage and formation, 1457F lung, 1434–1436 NADPH oxidase complex, 1532 phagocytosis, 787, 788F, 1531–1532 antibody-activated, 1555, 1555F, 1557T Mycobacterium tuberculosis, 1507–1508 Salmonella enterica, 1533 receptors, 1531–1532 respiratory tract, 1434–1436 Toll-like receptors (TLR), 1531 tuberculosis, 1507–1508, 1593–1594 see also Antigen-presenting cells Macrophage-colony-stimulating factor (M-CSF), 1460T macrophage production role, 1460–1461 Macropinosomes, 1508 Mad2 protein, spindle assembly checkpoint, 1088, 1088F Mad cow disease see Bovine spongiform encephalopathy (BSE) MADS box gene regulator y proteins, 1400T, 1414 Magnesium, long-term potentiation, 691 Magnetic tweezers, 527

b-Lipotropin, 803F

Maintenance methyltransferase, DNA methylation,

maturation, 781F



467 Maize, 16F, 318T, 1410–1411, 1411F Major groove recognition, 419, 419F DNA-binding proteins, 419F, 423, 424F helix-turn-helix motif, 419, 420F see also DNA structure Major histocompatibility complex see MHC (major histocompatibility complex) Malaria, 1494–1495, 1495, 1495F spread, 1501–1502 see also Plasmodium falciparum Malate, 122F, 123F Malate dehydrogenase, 123F

Mating-type cassette, 455–456, 457F Mating-type switching, 455–456, 456F 456F,, 457F, 458F see also Gene conversion; Gene silencing Matrix-assisted laser desorption ionization–time-offlight (MALDI-TOF) spectrometry, 519–520 Matrix metalloproteinases (MMPs), 1194 Matrix receptors, 1169 integrins see Integrin(s) Mature naive B cell, 1553 Mbl protein, 989, 990F M-Cdk, 1062, 1066 activation by dephosphorylation, 1074–1075,

see also Membrane transport; Vesicular transport viscosity, 644 see also Lipid bilayer(s); Lipid raft(s); Plasma membrane; specific types/locations Membrane attack complex, 1529, 1529F Membrane potential, 653, 669, 671F, 821F mitochondrial inner membrane, 820–821, 821F resting, 669, 669–671, 671 Membrane protein(s), 629–649, 630F amounts, 629 association with lipid bilayer, 629–630, 631F cell surface exposure, 630

MALDI-TOF mass spectrometry, 519–520 see Cancer Malignancy Mammalian cell(s) cell culture, cell cycle analysis, 1059, 1059F chemical composition, 63T DNA replication, 281F 281F,, 283–284 mitochondrial DNA, 859 mRNA editing, 484 replicative senescence, 1059 Mammalian development, 1378–1383 branching morphogenesis (of lung), 1381–1382, 1382F early stages and extraembryonic membranes, 1379–1380, 1379F embryonic stem cells (ES cells), 1380–1381, 1381F left-right asymmetry, 1376–1377, 1376F regulative properties of early embryo, 1380 see also Mouse development; individual species Mammalian genetics gene control regions, 450–453 gene regulatory proteins, 418T genetic conservation, 39–40

1074F 1071, 1074 entry into mitosis, microtubule dynamics and, 1080 spindle assembly role, 1078–1079, 1079F, 1080 Mcm proteins, 289F, 456F, 1068 M-cyclins, 1062, 1064, 1074, 1087, 1101 Mdm2 protein, 1105, 1106F 1106F,, 1107 Mechanoreceptor(s), mechanosensory bristles, 1356F Mef2 genes/proteins, 464F Megakaryocytes, 1099, 1453T, 1454, 1455, 1457F see also Blood cells; Platelet(s) Meiosis, 34, 554F 554F,, 1090–1092, 1269, 1272–1274,

diffusion, , 643F, endoplasmic reticulum, 468 glycosylation, 635–636 glycosylphosphatidylinositol anchor, 742–743, 742F integral, 630 interchain disulfide bonds, 636 lipid-linked, 630 localization, 468–487, 645, 645F multicomponent complexes, 642–643 peripheral, 630 single-particle tracking, 644 solubility, 636–640 structure, 135 seeTransmembrane transmembrane see Transmembrane protein(s) see also specific types/proteins Membrane shuttle, mannose-6-phosphate (M6P) receptor(s), 784 Membrane trafficking, intracellular pathogen strategies, 1511–1514, 1511F Membrane transport importance, 651 intracellular, 750–766


468–470 imprinting, Mammary gland alveoli, 1427–1428, 1427F basal lamina, 1428 development and regression cycles, 1426–1428, 1427F myoepithelial cells, 1427F Mannan-binding lectins, 1529 Mannose-6-phosphate (M6P) lysosomal import, 783–784 lysosomal sorting, 785, 786F receptors, 755, 784 structure, 784F Mannose-6-phosphate (M6P) receptor(s), 755, 784 MAP2 protein, 995F, 1001, 1001F MAP-kinase(s), 928, 928–931, 929FF, 936F EGF effects, 929F Erk, 929, 929F evolution, 177F neuronal, 930 NGF effects, 930 plants, 958 see also Ras GTPase(s) MAP-kinase-kinase (MAPKK), 929, 929FF MAP-kinase-kinase-kinase (MAPKKK), 929, 929F MAP-kinase signaling pathway, 928–931, 929FF, 1103 see also speci specific fic components components MAPs see Microtubule-associated proteins (MAPs) Maps (brain), 1391–1393, 1392F retinotectal, 1391F, 1392–1394 Marfans syndrome, 1190–1191 Marine invertebrates, fertilization in, 1297 Marker genes see Reporter gene(s) Mass spectrometry accuracy, 519 liquid chromatography combination, 522 MALDI-TOF, 519–520 membrane composition, 624 principles, 520F protein analysis, 519–521, 520F tandem, 519–521 Mast cells, 1451, 1556 histamine secretion, 804, 804F, 1557F interleukin secretion, 1598T Master regulatory proteins, 1362 Mata1 protein, 456 Mata2 protein, 418T, 425F, 456 Maternal inheritance chloroplast genome, 866, 866F mitochondrial genome, 865F 865F,, 866 Mathematical modelling, 35–36, 35F Mating factors (yeast), 455–456


checkpoints, 1281 errors, 1278–1279 evolutionary conservation, 1280, 1286 genetic diversity and, 1271, 1279F under Homologous homolog pairing see underHomologous chromosomes (homologs) homolog recombination/crossing-over see under Homologous recombination (crossing-over) homolog segregation, 1278–1279 1276–1278, 1277F, lampbrush chromosomes, 234F meiosis I, 1090–1092, 1091F, 1091F, 1273–1274, 1273F kinetochores, 1277–1278 prophase I stages, 1275–1276, 1276F specific protein complexes, 1278, 1280 meiosis II, 1090, 1091F, 1092, 1273F, 1273F, 1274, 1278 meiotic S phase, 1090 micromanipulation experiments, 1278 mitosis vs., 1091F, 1272, 1273F, 1276–1277, 1277F oocytes, 1280, 1288, 1290, 1292 regulation, 1280–1281 sex differences, 1280–1281 timing differences, 1280, 1281F see also Mitosis under Homologous Meiotic recombination see underHomologous recombination (crossing-over) Mek kinase, 929F Melanocytes, 1418F fish, 1023–1024 lysosomal exocytosis, 786 melanosomes see Melanosomes Melanocyte stimulating hormone (MSH), production, 803F Melanoma, definition, 1206 Melanosomes, 786, 1022, 1022F 1022F,, 1024F Melatonin, circadian clock, 461 Melting temperature, 537F Membrane(s) composition fatty acids, 58–59 lipid(s), 617–629, 645, 645F see also Lipid bilayer(s); Phospholipid(s); individual lipids lipid to protein ratio, 629 phosphoinositides, 757 proteins see Membrane protein(s) disruption, 510 electrical properties, 667–692 see also Membrane potential fluidity, 621–622 fusion, 763F, 764, 768, 769F intracellular, 26, 169, 697–698, 697T intracellular pathogen strategies, 1511–1514, 1511F liver cell (hepatocyte), 697T pancreatic exocrine cell, 697T strength, 646–648 structure, 617–648, 617–649, 618F see also Lipid bilayer(s) transport across, 651–692


principles, 695–736 of proteins,651–654 see also Endoplasmic reticulum (ER); Protein sorting; Protein translocation; Protein transport of small molecules, 651–692 carrier proteins and active transport, 9–10 Thermotoga maritima, 10F see also Active transport; Carrier protein(s); Channel protein(s); Ion channel(s) vesicular traffic see Vesicular transport see also Active transport; Channel protein(s) Memory B cells, 1546 Memory cells, adaptive immunity, 1546, 1546F Memory, synaptic plasticity, 1396 b-Mercaptoethanol, 517 Meristem(s), 956, 1195, 1403 apical see Apical meristem flower, 1413 maintenance, 1409–1410, 1410F plasmodesmata, 1163 regulation by CLV1, 956, 957F sequential development, 1403 size, 1409–1410 MERRF, 866 Mesenchymal cells (“immature”fibroblasts), 1468 Mesenchymal stem cells, 1468 Mesenchyme, 1141 Mesoderm, 1307, 1307F, 1335, 1365, 1445 Mesophyll cells, 846 Mesophyll (parenchyma), cells, 846 Messenger RNA (mRNA), 4, 331, 334 cap snatching, 1517 degradation, 485 gene expression regulation, 379F 379F,, 415, 492–493

nonsense-mediated decay see Nonsensemediated mRNA decay pathways, 492, 492F RNA interference, 495 eucaryotic, 346F, 487–488 3¢ end generation, 357–358, 357F, 482–483 see also Polyadenylation (mRNA 3¢ end) 5¢-caps see 5¢ Capping of eucaryotic mRNA cDNA clones, 543F, 544 editing, 483–485 expression levels, human cell types, 412 internal ribosome entry site (IRES), 491, 491F, 1517 localization, 486–487, 487F under Nuclear–cytoplasmic nuclear export see underNuclear–cytoplasmic transport processing see RNA processing (eucaryotic)

Mating type (yeast), 455–456

impermeant molecules, 597–598

splicing see Splicing

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



translation start sites, 379–380, 380 untranslated regions, 487, 488 function, 336T localization by the cytoskeleton, 1022–1023 polyadenylation see Polyadenylation (mRNA 3’ end) procaryotic, 346F, 380, 381F, 488 ribosome interactions see Messenger RNA–ribosome interactions splicing see Splicing stability, 492, 492–493 transfer RNA interactions, 180–181 translation signals, 379–380, 383

class restriction, 1579–1580 dendritic cells, 1571 H-2 (histocompatibility-2) antigen, 1575 human genes, 1577F 1577F,, 1588 invariant pocket, 1578, 1579F MHC class I, 1575, 1577–1578, 1580T, 1581–1582, 1599F coreceptor recognition, 1580–1581, 1581F expression on viral-infected cells, 1535–1536 nonclassical, 1577 peptide loading, 1581–1582, 1583F recognition by coreceptors, 1581F recognition by natural killer cells, 1535–1536

chromosome effects on, 1081, 1082F cytokinesis and, 1095–1097, 1096F, 1097F instability/dynamics, 1080, 1081F kinetochore attachment, 1082, 1083F 1083F,, 1084F spindle formation, 1035, 1035F 1035F,, 1075–1077, 1079 see also Mitosis; Mitotic spindle motor protein types, 1014–1015 see also Kinesin(s) neurons, 1021, 1047–1048, 1048F nucleation, 992, 992F, 1034 pathogen movement based on, 1516–1517 plant cells, 1097–1098, 1200–1202, 1200F,

see alsoTranscription; alsoTranscription; Translation Translation Messenger RNA–ribosome interactions path through, 376F ribosome binding-site, 375F, 376 bacterial mRNA, 381F bacterial Shine–Dalgarno sequence, 380, 381F, 488 internal ribosome entry site (IRES), 491, 491F, 1517 see also Protein synthesis; Ribosome(s) Messenger RNA–transfer RNA interactions, 180–181 see alsoTransfer alsoTransfer RNA (tRNA); Translation Metabolic balance, 102 Metabolic map(s), 67F 67F,, 102F Metabolic pathway(s) enzyme catalysis, 66F regulation, 169–171, 170F evolution, 870–872 interrelationship, 67F, 100 organization, 66, 66F, 101, 102F, 102FF see also Biosynthesis; Catabolism; specific pathways Metabolic rate enhancement, 168–169, 169

structure, 1576F, subtypes, 1576F 1577–1578, 1578F, 1579F MHC class II, 1575, 1577, 1577–1578, 1580T, 1581F, 1583, 1599F coreceptor recognition, 1581, 1581F peptide loading, 1583–1585 recognition by coreceptors, 1581F structure, 1576F, 1577 subtypes, 1576F peptide-binding, 1574F 1574F,, 1577–1579, 1579F, 1580F see also Protein–protein interactions polymorphism, 1576, 1588 restriction, 1406, 1581, 1584–1585 specificity pocket, 1577–1578, 1579F T cell interactions, 1569–1589 T cell selection, 1585–1586 transplantation reactions, 1575–1576 Micelle(s), 115F, 620, 621F 621F,, 637 Michaelis–Menten equation, 162F Microbial flora normal, 1486, 1501 pathogenic see Pathogen(s)

1201F plus and minus ends, 974–975, 978F properties, 965 structure, 968, 968F, 974–975, 974F see alsoTubulin alsoTubulin subunits, 971 treadmilling, 976–982, 977FF Microtubule-associated proteins (MAPs), 995F, 1080 Microtubule-dependent motor protein(s),

Metabolism, 66 activated carrier molecules, 79–86, 79F anabolism/biosynthetic see Biosynthesis balance, 102 catabolism see Catabolism cooperation, 102 rate increases by multienzyme complexes, 168–169 regulation, 101–102 tissue differences, 102 see also Metabolic pathway(s) Metal affinity chromatography, 514 Metal-shadowing, electron microscopy, 609, 610F Metamorphosis, Drosophila, 1329, 1352 Metaphase, 1054, 1072F chromosome movement, 1086 chromosome structure, 243, 243F microtubule dynamics, 1080 see also Mitotic chromosome(s) Metaphase plate, 1085 Metaphase-to-anaphase transition, 1061, 1066, 1071, 1087 Metastases (secondary tumors), 1206, 1206F, 1220,

see also Bacteria Microdissection techniques, 502, 503F Microelectrode(s), intracellular ion measurement, 596 Microfibrils, 1190–1191, 1197–1198, 1197F Microfilaments see Actin/actin filaments b2-Microglobulin, MHC protein/antigen interactions, 1580F Microinjection, impermeant molecules, 597–598, 598F MicroRNA (miRNA), 336, 493–495, 494F Microsatellite DNA, hypervariable (VNTRs), 547F Microscopy, 579 cell cycle analysis, 1059 cell structure analysis, 579–591 electron microscopy see Electron microscopy historical aspects, 501, 501F image processing, 583–584, 584F light microscopy see Light microscopy resolving power, 581F sample preparation, 554–555, 585 fixation, 585, 605, 605F sectioning, 585, 585F 585F,, 605 staining, 554–555, 579, 585, 585F scale, 580, 580F in situ hybridization, 585, 586F Microsome(s), 511, 726, 726F Microsporidia, 1510–1511, 1511F Microsurgery, C. elegans, 1325 Microtome, 585, 585F Microtubule(s), 965F accessory proteins, 992, 995F assembly, 973, 974, 975 see also Microtubule(s),nucleation; Tubulin bundles, organization by MAPs, 1001, 1002F capping, 1003 cell division and, 969 see also mitosi mitosiss (below) cell polarization, communication with actin cytoskeleton, 1046 cellular location, 969 configuration, astral, 993 depolymerization, 1085, 1085F, 1089, 1201 dynamic instability, 969, 980, 981F, 982F, 1080, 1081F centrosome role, 1046 endoplasmic reticulum organization, 1021 fibroblasts, 1048F Golgi apparatus organization, 1021 growth rate of plus/minus ends, 975–976, 976F interpolar, 1035, 1035F kinesin binding site, 1014F mitochondria association, 815, 816F

Milk, production and secretion, 1427F Minimum gene compliment, 10,1427, 570–571 Minor groove-binding, DNA-binding proteins, 423, 424F Miranda protein, 1361 Mismatch conversion, gene conversion, 315F Mismatch proofreading, 277–279, 277F 277F,, 315–316, 315F Mismatch repair, 272 deaminated methylated cytosines, 302–303 exonucleolytic proofreading, 270, 270F strand-directed mismatch repair, 272, 276–278, 277F dysfunction and cancer, 277–278, 295–296, 295T see also DNA repair disorders Mitochondria, 29F, 696, 815–827 apoptosis role, 1121, 1121F, 1122F, 1124F, 1125F membrane potential, 1118 protein release, 1121, 1123 b barrel proteins, 635 biogenesis, 856, 856F 856F,, 866–867, 867F cardiolipin synthesis, 867–868, 868F cell aging, 868 cell-free systems, 511 cell metabolism, 838–839, 839F distribution during cytokinesis, 1098 DNA see Mitochondrial genome energy conversion, 815–827 citric acid cycle see Citric acid cycle electron transport see Mitochondrial electron transport chain(s)(s) energetics, 819, 819F high-energy electrons, generation, 817 oxidation of food molecules, 97F, 819F oxidative phosphorylation see Oxidative phosphorylation respiratory enzyme complex, 820 see also ATP synthesis evolution, 27–28, 29F, 699, 700F, 859–860, 860F, 874, 875F bacterial resemblance, 857, 859 fractionation, 511, 817F see also Cell fractionation genome see Mitochondrial genome glutathione peroxidase, 868 growth and division, 857–858, 858F heat production, 838 high ATP:ADP ratio maintenance, 823–824 historical aspects, 815–816 import into, 745 see also Mitochondrial protein import lipid import, 867–868


barriers, 1220, 1250F colonization of distant tissues, 1220, 1250 easy and difficult steps, 1250F ECM degradation, 1193, 1194, 1194F entry into circulation, 1220, 1221F 1221F,, 1250 local invasion/invasiveness, 1220, 1249 monitoring, 1250 mutations leading to, 1249–1250 process (steps), 1220, 1221F Methanobacterium, 16F Methanococcus, 16F, 18T Methionine, 101, 129F Methionine aminopeptidases, 395 Methylated DNA binding proteins, DNA methylation, 468 Methylation DNA see DNA methylation histone tails, 222, 223F rRNA, 361, 362F see also Methyltransferase(s) 5-Methylcytosine, 428F deamination, 301F, 470 DNA methylation, 467, 467F structure, 301F Methyltransferase(s) DNA see DNA methyltransferase(s) 5¢ mRNA capping, 346, 347F Met repressor, b sheet motif, 423F MHC (major his tocompatibility complex), 1397F,


see also Kinesin(s) Microtubule flux, 1085, 1086F, 1089 Microtubule-organising center (MTOC), 992 see also Centrosome Microvilli actin filament nucleation, 996 bundle of actin filaments, 969, 970F egg (ovum), 1298, 1298F membrane transport, 659 structure, 1008F Mid-blastula transition, 1365 Midbody (cytokinesis), 1094, 1094F Migration see Cell migration

1569–1589, 1571, 1575, 1575, 1576F

mitosis, 1075–1076, 1076F

localization, 815, 816F


microtubule association, 815, 816F nuclear-encoded tissue-specific proteins, 867 import see Mitochondrial protein import poisons, 834, 836 protein import see Mitochondrial protein import protein synthesis, 856–857, 856F, 867, 869F see also Mitochondrial genome RNA editing, 483, 484F structure see Mitochondrial structure superoxide dismutase, 868 urea cycle, 867 variability with cell type, 857 volume, 697T


Mitogen(s), 1102–1103 competition for, 1110 G1-Cdk stimulation, 1103–1105 G1/S-Cdk stimulation, 1103–1105 intracellular signaling pathways, 1103, 1107, 1107–1108, 1108F specificities, 1102–1103 see also Growth factors; specific mitogens Mitogen-activated protein kinase(s) see MAPkinase(s) Mitogen-activated protein kinase signaling see MAP-kinase signaling pathway Mitosis, 208F, 1054, 1055F, 1071–1092

photoactivation visualization, 594–595, 595F see also Mitotic chromosome(s) Mobile genetic elements, 316 bacterial, 318F Drosophila melanogaster, 318T human genome, 207F 207F,, 318T Alu family, 250F, 323FF DNA transposons, 207F LINEs, 207F retroviral-like elements, 207F SINEs, 207F insertion mechanisms see Site-specific recombination


866 Mitochondrial diseases, DNA see Mitochondrial genome Mitochondrial electron transport chain(s)(s), 814, 819–820, 827F, 831–839 chloroplasts vs., 814, 815F, 853–854, 855F electron carriers, 829, 831 coenzyme Q (ubiquinone), 831, 832F cytochromes, 829, 830F, 831 see also Cytochrome(s) iron–sulfur proteins, 830F 830F,, 831 random collisions, 834 spectroscopy, 831, 832F see also Respiratory enzyme complexes electron tunneling, 823–824 energetics, 819, 820F energy storage, 821 enzyme complexes see Respiratory enzyme complexes natural (brown fat), 838 redox potentials, 835, 835F respiratory control, 837–838 reverse electron flow, 838 uncoupling, 836

in absence cytokinesis, 1087, 1088F APC/C and of completion, asymmetric cell division, 1099 Cdk inactivation, 1100–1101 centriole function, 1076 centrosome duplication, 1078 checkpoints, 1061, 1066, 1071, 1088 see also Cell cycle control chromosome packaging, 1070–1071, 1090 chromosome segregation, 1089–1090 chromosome structure see Mitotic chromosome(s) condensin and, 1075 entry into Aurora kinases, 1074, 1084 M-Cdk and, 1071, 1074–1075, 1078–1079 microtubule dynamics, 1080, 1081F Polo-like kinases, 1074 kinetochore and, 1082–1083 meiosis vs., 1091F, 1272, 1273F, 1276–1277, 1277F microtubule instability and, 1080, 1081F mitotic spindle see Mitotic spindle

see also Repetitive DNA; Transposon(s); Virus(es); specific elements Model organism(s), 25 Arabidopsis,36 , 36F, 1398–1399 Caenorhabditis elegans, 36–37, 367F Drosophila melanogaster, 37–38, 37F, 1328–1329

E. coli,24–25, 25F humans, 40, 43F mouse, 39–40, 43F yeast, 33–34, 34F see also indiv individual idual models Modular organization, Eve gene, 1339 Moesin, 1009 Molarity, definition, 46 Molecular chaperones see Chaperones Molecular clock(s), 248–249, 862 Molecular evolution, 245–260 clock hypothesis, 248–249 mitochondria, 862 phylogenetics, 247, 247F, 248F Molecular mimicry, release factors (translational), 381, 382F

see also Oxidative phosphorylation Mitochondrial genome, 856–857, 861F, 868–870, 869F copy number, 858 diversity, 859, 861F copy number, 857T, 858 sizes, 859F DNA replication, 856–857, 857F, 858 evolution, 859–860, 861F maintenance, 868–870 molecular clock rate, 862 gene expression, 483, 484F 484F,, 861–862 transcription, 863 genetic code variation, 367, 862, 862T human, 861–862, 861F mutations, 866 Mitochondrial diseases, 866 non-Mendelian inheritance, 864–865, 865F, 866 nucleoids, 859 Mitochondrial protein import, 713–719, 716FF chaperone proteins, 715, 716F, 717, 717 contact sites, 715–716, 715F 715F,, 718F energy use, 716–717, 716F into inner membrane/intermembrane space, 717–719, 718F mechanisms, 716FF OXA complex, 714F, 715, 718, 718F precursor proteins, 713, 715 protein translocators, 714–715 SAM complex, 715 signal sequences, 714, 714F stop-transfer sequence, 718 seeTIM TIM complex see TIM complex seeTOM TOM complex see TOM complex Mitochondrial reticulum, in yeast, 857, 858F Mitochondrial structure, 713, 713F, 815–817, 817F, 818F chloroplasts vs., 841–842, 843F cristae, 817, 817F inner membrane, 713, 817, 817F, 818F, 821F electrochemical gradient, 820–821, 821F electron tunneling, 834–835 respiratory enzyme complexes, 820, 831–832 transport across, 822 intermembrane space, 713, 816, 818F

sister chromatids, 243, 243FF bi-orientation mechanism, 1083–1085, 1084F separation, 1087, 1087F, 1088, 1088F spindle attachment, 1082–1083 spindle attachment, 1082–1083, 1084F bi-orientation mechanism, 1083–1085, 1084F forces acting on, 1085–1087, 1085F, 1086F, 1089 unattached chromosomes and, 1088 see also Kinetochore Mitotic index, 1059 Mitotic spindle, 208F 208F,, 1054 assembly, 712F, 1077–1082, 1077F, 1078F, 1079F, 1082F, 1088 asymmetric cell division, 1099, 1099F chromosome attachment, 1082–1083, 1084F bi-orientation mechanism, 1083–1085, 1084F forces acting on, 1085–1087, 1085F, 1089 unattached chromosomes and, 1088 see also Kinetochore cytokinesis plane of division, 1095–1097 disassembly, 1054–1055, 1090 intermediate filaments, role, 966–967 lamellipodia vs., 1039

Molecular motions,see 74–75, 75F Molecular motors Motor protein(s) Molecular switches, 895, 895–897, 895F cell cycle control, 1061, 1065–1066, 1075 GTPases, 179, 179F Ran GTPase, 708–709 Rho family GTPases, 1042–1043 in vesicular coat assembly, 759–760 see also individual proteins Molecular weight, definition, 45 Molecular weight determination, centrifugation techniques, 522–523 Molecule(s), 48 hydrophilic, 52 hydrophobic, 52 large see Macromolecule(s) representation, 51 small cellular organic see Organic molecules (small, cellular) Mollusk, eye development, Pax-6, 1306F Molten globule, 387–388, 388F Mom (more mesoderm) mutants, 1325 Mono-allelic expression, epigenetics, 473 Monoclonal antibodies, 508–509, 509F in cancer therapy, 1260 immunofluorescence microscopy, 587F, 588F, 589 Monoclonal response (lymphocyte), 1545 Monocytes, 1452, 1452F 1452F,, 1453T, 1457F under GTP-binding Monomeric GTPases see underGTP-binding proteins (GTPases) Monosaccharides, 55, 57F, 112F Monoubiquitinylation, 926 Morphogenic gradient(s) cell fate dependent on position, 886, 886F definition, 1318 Drosophila egg, 1333–1335, 1334F, 1335F Drosophila wing imaginal disc, 1352 see also speci specific fic morphogens morphogens Morula, 1379, 1379F Mosquitoes, Plasmodium transmission, 1494, 1501–1502 Motor neuron(s), 688, 688F, 1385, 1386F Motor protein(s), 181–182, 1010–1025 actin-based see Myosin(s)

matrix,space, 816, 818F, 713 853 matrix membrane composition, 697T outer membrane, 713, 713, 816, 817F, 818F porin insertion, 717, 717F role in respiration, 821 see also Electron transport chain; Oxidative phosphorylation

length, 1079 as microtubule-based machine, 1075–1077, 1076F, 1079 assembly, 1034–1035, 1035F bipolar array, 1034–1035, 1075–1076, 1077, 1081 classes, 1034, 1035F instability, 1035, 1080, 1081F

ATPsee hydrolysis, also ATP hydrolysis , 1017F biological functions, 181, 1010, 1021–1022 axonal transport, 1021, 1048F microtubule dynamics and, 1080 mitotic spindle assembly/function, 1077, 1077F, 1079, 1079F mitotic spindle movements, 1034–1035

nuclear lamina, dissociation, 710–712, 712F phases, 1071, 1072FF anaphase, 1054, 1073F 1073F,, 1089–1090, 1089F metaphase, 243, 243F, 1054, 1072F prometaphase, 1072F prophase, 1054, 1072F telophase, 1055, 1073F 1073F,, 1090 see also speci specific fic phases see also Cell cycle; Cytokinesis; Meiosis; Microtubule(s) Mitotic chromosome(s), 208–209, 208F 208F,, 209, 243, 243F, 244F, 245 bipolar spindle assembly, 1081–1082 centrosome duplication, 1078 condensation, 243, 244F, 1075F chromatin condensation, 1070 condensin role, 1075 M-Cdk and, 1071 metaphase, 243, 243F separation/segregation, 865, 865F 865F,, 1087, 1087F, 1089–1090


see also Mitochondrial genome

muscle contraction, 1026–1030

see also Microtubule(s); Motor protein(s)

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



organelle transport, 1021–1022 RNA localization, 487F 487F,, 1022–1023 spindle pole separation, 1089 see also Mitosis; Mitotic spindle conformational changes, 1016–1019 evolutionary origins, 1015–1016 kinetics, 1020–1021 mechanisms, 1016–1020 microtubule-based, 1014–1015 see also Dynein(s); Kinesin(s) regulation, 1023–1025 see also speci specific fic types Mouse

structure, 1026, 1027F 1027F,, 1028F, 1029, 1029F Muscle cell(s) cardiac, 1463–1464 differentiation, 464, 464F, 1464, 1480 see also Myoblast(s); Myogenic protein(s) protein isoforms, 1465 skeletal see Skeletal muscle smooth, 888, 1450, 1463–1464, 1463F syncytium, 1464 uncoordinated growth and division, 1109 visualizing, 1425 Muscle fiber(s), 1026F 1026F,, 1064, 1464–1465, 1465F Muscular atrophy (inherited spinal), SMN protein

mitogen activation and, 1103 as oncogene, 1107, 1238–1239, 1242, 1242F Mycobacterium tuberculosis, 1487 genome size, 18T host cell membrane traffic and, 1512, 1512F persistence, 1507–1508 phagocytosis and survival inside phagocytic cells, 1507–1508 phagosome maturation prevention, 1512 transmission, 1507 Mycoplasma, 14F, 1500 Mycoplasma genitalium, 10 , 11F, 18T, 570–571 Myelin sheath

development see Mouse development genome chromosomes, 293–294 comparative genomics, vs human, 249F conserved synteny, 207, 208F, 250 imprinting, 469F, 470F see also Genomic imprinting transposons, 323, 323F knockouts production, 567F transgenic organism(s), 566–568, 568F see also Gene knockouts as model organism, 39–40, 43F, 1378 chimeras, 1380, 1380F, 1381F genetics, vs. humans, 1378 transgenic mouse production, 567F Mouse development, 1378–1383 branching morphogenesis (of lung), 1381–1382, 1382F early stages and extraembryonic membranes, 1379 egg, 1379 embryo, 1379, 1379F, 1380

mutation, 364–365 Muscular dystrophy, 1005, 1169, 1173, 1466 Mutagenesis carcinogenesis, 1208 gene expression analysis, 556 mechanisms, 296, 298f, 303F, 528F, 556 see also Mobile genetic elements random, 553, 556 site-directed, 565, 565F in vitro mutagenesis, 575 yeast, 570 see also Mutation(s) Mutation(s), 16–17, 263, 528F in cancer, 265, 1106, 1208, 1209, 1209–1210, 1217, 1261 conditional, 528F temperature-sensitive, 557, 557F, 1057, 1057F consequences, 264, 570 cancer development, 1106, 1209–1210, 1217 see also Cancer; Cancer-critical genes evolutionary innovation, 18, 19F, 246 see also Genome evolution deletion, 528F

action potential , 679F see also Actionpropagation, potential(s) structure, 680F Myoblast(s), 464 cell culture micrograph, 504F differentiation, 1464 fusion, 1464, 1464F maintenance, signals, 1466 persistence as satellite (stem) cells, 1466 recruitment, muscle fiber growth, 1466 skeletal muscle fiber formation, 1465–1466 somite origin, 1373–1374 Myoclonic epilepsy and ragged red fiber disease (MERRF), 866 MyoD gene, 464F MyoD gene regulator y proteins, 418T, 464, 464F, 464F, 1464 Myoepithelial cells, 1427F 1427F,, 1463–1464, 1463F Myofibril, 1026, 1027F Myofibroblasts, 1468 Myogenic protein(s), 464, 464F see also MyoD gene regulatory proteins Myogenin gene regulatory protein, 464

embryonic stem cells (ES cells), 1380–1381, 1381F under Cell cycle M phase of cell cycle see underCell MreB protein, 989 Mrf4 gene regulatory protein, 464 MRNA see Messenger RNA MSH, production, 803F MTOR, protein kinase, 934, 934F mu chain, IgM, 1553 Mucociliary escalator, 1435, 1503 Mucus host defense mechanism, 1502, 1525 secretion, 772, 774F, 1435, 1437 Multicellularity cell–cell interactions, 1131–1132 see also Cell adhesion; Cell junction(s); Extracellular matrix (ECM) cell specialization see Cell differentiation evolution, 955 see also Development; Tissue(s) Multidrug resistance, 665–666 Multienzyme complexes, 168–169, 169, 169F see also Protein complexes (assemblies) Multinucleated cells, mitosis without cytokinesis, 1099 seeTransmembrane Multipass proteins see Transmembrane protein(s) Multiple sclerosis, demyelination, 678 Multipotent stem cells see Stem cell(s) Multispecies conserved sequences, 252–253, 252F Multiubiquitylation, 795 Multivalent antigen(s), 1557 Multivesicular bodies, 795–797, 795F, 796F, 797F Mumps virus, 1496F Muntjac deer, chromosome differences, 204–205, 205F Muscarinic acetylcholine receptors (mAChRs), 916 Muscle, 1463–1467 basal lamina, 1164F cardiac see Cardiac muscle cells see Muscle cell(s) classes, 1463, 1463F contraction, 1026–1030 control by troponin, 1029, 1030F role of Ca2+, 1028–1030 sliding-filament model, 1026–1028, 1028F

destabilizing/deleterious, 265, 1214 dominant, 558 dominant negative see Dominant negative mutation(s) elimination by natural selection, 264, 265 gain-of-function, 528F 528F,, 557–558, 564F, 1231 germ-line, 264, 265 histones, 213 identification, 556–557, 559–560 see also Genetic screens intragenic, 18, 19F inversion, 528F lethal, 528F loss-of-function, 528F, 557–558, 1231 mechanisms, 296, 298F see also Mutagenesis neutral mutations, 17 null, 528F point mutation, base substitution, 246 protein, effect on, 558F rate see Mutation rates recessive, 558 screening, IVF and, 1302 silent, 264 somatic, 265, 1208, 1209 suppressor, 528F synonymous, 247 translocations, 528F, 1261 see also speci specific fic types Mutation rates, 246, 263–264 Caenorhabditis elegans, 264 DNA repair defects, 296 Escherichia coli, 263–264 evolutionary significance, 248–249, 264 fibrinopeptides, 264 germ-line, 264 increases, 265 see also Cancer; Genetic instability limitation on number of essential genes, 265 mammals, 264 measurement, 264 mitochondrial DNA, 862 natural selection effects, 264, 265 underestimation, 263–264 Mutator gene(s), 276–277

Myoglobin, 20, 21F, 144F Myosin(s), 1011–1014 ATP hydrolysis, 1012, 1017F cycle of structural changes, 1016 enzymatic digestion, 1012 evolutionary origin, 1015–1016 force generation, 1016 motor activity of head, 1012F movement speed, 1020 muscle contraction, 1026–1028 non-muscle, 1012–1013 power stroke, 1016 rigor state, 1019 structure, 1012, 1013, 1015F 1015F,, 1016 subtypes, 1013, 1013F see also indiv individual idual types Myosin I, 1013, 1013F Myosin II, 1011 cell motility, 1039F, 1041 contractile ring (cytokinesis), 1093–1094, 1095, 1095F filament arrangement, 1026 lever arm, 1020, 1020F mechanochemical cycles, 1017F muscle contraction, 1026–1028 processivity, 1020 regulation by phosphorylation, 1024–1025, 1025F structure, 1011F thick filament, 1012F Myosin V, 1013, 1020, 1022 Myosin light-chain k inase (MLCK), 1024, 1025F, 1030 Myostatin, 1110, 1111F gene mutation, effects, 1455–1466 muscle growth control, 1465, 1466F mutation in mice, 1466F Myotendinous junctions, 1170 Myotonia, voltage-gated cation channels, 682


development, 464, 464F, 1464 see also Myoblast(s); Myogenic protein(s) dilator, 1464 fibers see Muscle fiber(s) heart see Cardiac muscle insect flight muscle, 1027F motor neuron innervation, 1385 skeletal see Skeletal muscle

MutHprotein, protein,277F 277F MutL MutS protein, 277F Myasthenia gravis, 1549 Myb gene regulatory proteins, 1400T Mycgene/protein, Myc gene/protein, 950 amplified in carcinoma, 1238F Burkitt’s lymphoma, 1239

N N-acetylneuraminic -acetylneuraminic acid see Sialic acid (NANA) NAC gene regulatory proteins, 1400T NADH dehydrogenase complex, 832, 833F, 836 NADH/NAD+, 78, 82–83, 92F citric acid cycle, 98, 817 electron carrier, 82–83, 818–819, 818F, 819–820 see also NADH/NAD+ functional roles, 83 generation, 819–820 glycolysis, 89, 92F, 93F

stem cell differentiation, 1425

chromosome translocation activating, 1239

production from pyruvate, 96


NADPH/NADP+, 78, 82–83, 82F electron carriers, 82–83, 82F functional role, 83 photosynthesis, 94 carbon-fixation, 845, 845F evolutionary significance, 872 noncyclic photophosphorylation, 850–853 NADPH oxidase complex, 1532 Naîve cells, immune response, 1546, 1546F Nanos protein, 1283, 1333F 1333F,, 1334, 1334F Nasal placode, 1384F Natural immunological tolerance, 1547 see also Immunological tolerance Natural killer (NK) cell(s), b 1453, activation, interferon(IFNb1453T, ), 15361535–1536 MHC class I recognition, 1535–1536 virus-infected cell destruction, 1535–1536 virus-infected cell recognition, 1536 Natural selection, 16–17 alleles, 561–562, 562F mutations, 264, 265 see also Mutation(s) protein conformation, 137 purifying selection, 247 self-replicating molecules, 404–406 sexual reproduction and, 1271 in tumor progression, 1212–1213 see also Evolution N-cadherin (neural cadherin), 1136, 1138T, 1388 NCAM (neural cell adhesion molecule), 1388 Nebulin, 1028, 1028F Necrosis, 1115 Negative feedback (feedback inhibition), 902, 902F allostery, 171, 172F see also Allosteric regulation conformational coupling, 171, 172F multiple, 170F, 171 rate of inhibition, 172, 173F regulation, 170F, 171 transcription circuits, 459, 459F Negative selection, thymus, 1586–1587, 1587F Negative staining, electron microscopy, 610, 611F Negative supercoiling, 344F, 345 Negative translational control, 488, 490F Neisseria, 1520 Neisseria gonorrhoeae, 22, 456 Caenorhabdi habditis tis elegans Nematodes see Caenor N-end rule see N-terminal degradation Neoplasm (tumor) see Cancer Nernst equation, 669, 670 Nerve cells see Neuron(s) Nerve growth fac tor (NGF), 923F, 923T, 926, 930, 1109 Nervous system apoptosis, 1115–1116 cadherin expression, 1136, 1136F development see Neural development neurons see Neuron(s) see also entrie entriess beginning neuro-/neural; neuro-/neural; speci specific fic regions/cell types Netrin protein, 1049, 1388, 1388F Neural cell adhesion molecule (NCAM), 1146–1147 Neural crest cell migration, 1036, 1140, 1140F, 1374, 1374F Neural development, 1383–1397 axon-dendrite distinction, 1, 1383, 1386–1387, 1387F cadherins and, 1140–1141, 1140F, 1141F early embryonic origins, 1383 brain and spinal cord (CNS), 1367F chick embryo, 1384F neural crest, 1374 peripheral nervous system (PNS), 1384 see also Neural crest cell migration effects of exper ience, 1395–1396, 1395F, 1396–1397 gap junctions, 1161 growth cones, 1049, 1049F 1049F,, 1386–1388, 1386F, 1447F guidance, 1140, 1387–1388, 1388F, 1393F integrins and, 1177 neural birthdays 1386Fand diversification, 1385–1386, neural crest cells see Neural crest cell migration neural map formation, 1391–1392, 1391FF, 1392F, 1393F activity-dependent remodelling, 1393–1395 neural migration, 1385F see also Neural crest cell migration

neural specificity, 1391–1394 neural tube, 1370, 1370F, 1384, 1385F neurite(s), 1390F neuroblasts, 1360 neurogenesis, 1360, 1360F 1360F,, 1383–1385 neuron death, 1389–1390 neurotrophic factors, 1389–1390, 1390F neurulation, 1370–1371, 1370F, 1371 phases, 1383, 1384F synapse elimination and remodeling, 1393–1395, 1394F, 1395F synapse formation, 1149F, 1393–1394 CAMs, 1147–1148


Nicotinamide adenine dinucleotide see NADH/NAD+ Nicotinamide adenine dinucleotide phosphate see NADPH/NADP+ Nicotinic acetylcholine receptors (nAChRs), 916 Nidogen, basal lamina, 1165, 1166, 1167F Nitric oxide (NO), 887–889, 888, 1450 Nitric oxide synthase, 888, 888F Nitrocellulose membranes, 519F, 538–539, 539F Nitrogen cycle, 100–101 Nitrogen fixation, 13, 13, 15F, 100 Nitroglycerine, 888 NK cells see Natural killer (NK) cell(s)


proteins, 1391F , 1148F Neuralscaffold maps, 1391–1393, Neural plate, 1161, 1370–1371, 1371F Neural retina see Retina Neural stem cells, 1478–1479, 1480 Neural tube, 1140, 1141F 1141F,, 1370, 1371F, 1385F Neuraminidase, subunit association, 143, 143F Neurites, definition, 1047 Neuroblasts, 1360–1361 Neurodegeneration, 1048 protein aggregates, 396–397 see also Prion diseases see also specif specific ic diseases Neurofibromatosis, 1010 Neurofilaments, 985T, 987, 987F 987F,, 1048 organization, 1005 see also Intermediate filament(s) Neuroligin, synapse formation, 1147–1148 Neuromuscular junction (NMJ), 684F acetylcholine receptors, basal lamina and, 1168 ion channels, 684–686 regeneration, basal lamina and, 1168–1169, 1168F

N-linked -linked oligosaccharide(s) formation, 774–775, 774F protein folding function, 739F protein glycosylation, 738, 776F three-dimensional structure, 777F NMDA receptors, 691–692 NMR spectroscopy, 139, 529–530, 529F, 530, 530T Nocodazole, 988T, 1021 Nodal protein, 1376–1377 Node, in plants, 1398F 1398F,, 1407 Nodes of Ranvier, 680, 680F NOD proteins, 1531–1532, 1536 Noggin protein, 940, 1316T Noise, electron microscopy, 610–611 Nomanski differential-interference contrast microscopy, 583 Noncoding DNA, 31, 204 genome rich in, 331 introns see Intron(s) from mitochondria, 860 repetitive elements see Repetitive DNA Noncoding RNA, 360–361 see also speci specific fic RNA types

Neuron(s) apoptosis, 1126, 1126F character assignment, 1385–1386 cytoskeleton dynamic instability, 1049 neurofilaments, 985T, 987, 987F, 1005, 1048 see also Intermediate filament(s) organization of microtubules, 1048F specialization dependent on cytoskeleton,

see also Neural development electrical properties, 688–690 see also Action potential(s) gap junctions, 1161 interconnections, 1385–1386 plasma membrane, 645 schematic, 675F size control, 1109, 1110F structure axons see Axon(s) cytoskeleton eleton (above) cytoskeleton see cytosk dendrites see Dendrite(s) function relationship, 675–676, 688F, 1049F polarized cells, 806, 806F see also Neurotransmitter(s); Synapse(s); specific types Neuronal doctrine, 504 Neurospheres, 1478 Neurospora, gene definition, 481 Neurotransmitter(s), 682, 683, 684, 882, 888F seeTransmitter-gated ion channel gating see Transmitter-gated ion channel(s) see also individual neurotransmitters Neutral mutations, 17 Neutrophil(s), 1451 apoptosis, 1117 cell crawling, 1036 cytoskeleton rearrangement, 969, 969F lineage and formation, 1457F 1457F,, 1460–1461 NADPH oxidase complex, 1532 phagocytosis, 787, 788F, 1531–1532, 1557T

Noncovalent interactions, 53–54, 110–111FF hydrogen bonds see Hydrogen bonds hydrophobic forces, 111F ionic bonds see Ionic bonds macromolecules, 55F, 64, 64F, 126–127, 156, 158F van der Waals attractions see Van der Waals forces weak interactions, 110F Noncyclic photophosphorylation, 850–853, 852FF ATP synthesis, 94–95, 95F, 851 NADPH synthesis, 94, 851 Nondisjunction, 1236F, 1278–1279 Non-Hodgkins lymphoma, metastasis, 1206F Nonhomologous end-joining, DNA double-strand break repair, 302–303, 303F Non-Mendelian inheritance, 864–865, 865F, 866, 866F Nonretroviral transposons, 318T Nonsense-mediated mRNA decay, 385–387, 386F Normal microbial flora, 1486, 1501 Northern blotting, nucleic acid hybridization, 538–539, 539F Nose, embryonic origin, 1384F 1384F,, 1429 Notch receptor protein, 777, 946, 947, 948F 948F,, 1356–1358 Notch signaling pathway, 946–948 angiogenesis, 1449 animal development, 1316F Arabidopsis, absence, 1400 at Drosophila wing margin, 1352, 1352F endothelial cells, 1448 gut cell differentiation, 1439–1440, 1439F in neurogenesis, 1360–1361, 1360F in non-neural tissue, 1362 pancreas, 1444 in sensory bristle development, 1356–1358, 1356F, 1358FF in skin, 1426 in vertebral limb, 1355 Notch signal protein, C. elegans early embryo, 1324 Noxa, apoptosis, 1123 NPCs see Nuclear pore complex(es) NSF, 764, 764F, 769F N-terminal degradation, 395–396

polarization, 1045F, 1046F 1462 rapid turnover by apoptosis, receptors, 1531–1532 structure, 1452F Toll-like receptors (TLR), 1531 Newt, limb regeneration, 1480, 1480F NFkB proteins, 952–954, 953F, 1530 NGF see Nerve growth factor (NGF)

Ntrc regulatory protein, DNA looping, 438F Nuclear–cytoplasmic transport directionality, 709, 709F export mechanisms, 708–709, 709F import, 705–710 mechanisms, 708–709, 708F 708F,, 709F, 710F receptors, 707–708, 708F, 710F regulation, 711F


development, 1383–1397 migration, 1385F specification (neurogenesis), 1360, 1360F, 1383–1385

see also Neural crest cell migration neural plate, 1367F 1367F,, 1370–1371, 1370F

N-glycanase, -glycanase, misfolded protein degradation, 740F

mRNA export, 329F 329F,, 358–360, 359F, 383

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



export-ready mRNA, 329F, 357, 358–359, 359F gene expression regulation, 485–486 HIV, 485–486, 486F localization mechanisms, 486–488, 487F regulation, 710 nuclear localization signals (NLSs), 705–707, 706F nuclear pore complexes see Nuclear pore complex(es) nuclear pores see Nuclear pores nucleoporins, 705 Ran GTPase, 708–709, 709F, 710F receptors, 708

nonhistone proteins, 211 protein binding, 215 structural organization, 211, 211F, 212F structure determination, X-ray diffraction, 212F transcriptional effects, 344 see also Chromatin Nucleosome sliding, 215–216, 215F Nucleotide(s), 3, 3, 3F, 61–62, 116–117FF biosynthesis, 101 damage, 296, 296F, 297F energy carriers, 61 see also ATP (adenosine triphosphate) hydrolysis

738, 776, 776F OMP decarboxylase, reaction rates, 161F Oncogene(s), 1107, 1231 activation, 1107, 1231–1234, 1238–1239, 1241–1242 identification, 1232 new methods of identification, 1239 overexpression, 1237–1239 viral, 1232 see also Cancer-critical genes; individual genes/proteins Oncogenesis, retroviruses, 1232 Oocytes, 1288, 1291F

709–710 regulation, , 711F shuttling proteins, 709–710 Nuclear envelope, 26, 200–201, 201F, 704 mitotic cells, 712F, 1071, 1079–1080, 1080, 1090 structure, 201F, 705F, 706F see also Nuclear lamina Nuclear export receptor(s), 708 Nuclear export signal(s), 708 Nuclear hormone receptor(s) gene duplication and divergence, 254, 255F gene regulatory proteins, 1400T zinc finger proteins, 421–422, 423F Nuclear import receptor(s), 707–708, 708F Nuclear lamina, 200, 201F, 704, 705F, 706F electron micrograph, 711F mitosis, 711–712, 712F structure, 710 Nuclear lamins, 984, 985T Nuclear localization signals (NLSs), 705–707, 706F Nuclear magnetic resonance (NMR) spectroscopy see NMR spectroscopy Nuclear matrix (scaffold), 242 Nuclear membrane, 704, 705F, 706F

actin filament cofilin, 1002 assembly, 974, 1002 FtsZ protein, 989 microtubule assembly, 974, 979, 979F motor protein force generation, 1016–1019 treadmilling, 976, 977F see also ATP hydrolysis nomenclature, 117F nucleic acid subunits, 61, 62, 197, 332 see also DNA (deoxyribonucleic acid); RNA (ribonucleic acid) structure, 61, 61F, 116F, 197 in tRNA, 370F see also individual nucleotides Nucleotide excision repair (NER), 295T, 298, 299F Nucleus compartments, 241–243, 241F, 242F DNA localization, 200–201 see also Chromosome(s); DNA (deoxyribonucleic acid) membrane amounts, 697T proteins, 358–359 structure, 200–201, 201F

asymmetrical 1289, 1289F 1288–1290 development division, (oogenesis), , 1289F, 1291F Drosophila, oogonium, 1288, 1290, 1290F follicle/accessory cells and, 1290–1292, 1290F, 1290F, 1291F gene expression, 1290 lampbrush chromosomes, 1288 maturation, 1288–1289, 1291–1292, 1291F meiosis, 1280, 1281, 1288, 1290, 1292 primary, 1288, 1289F, 1291F, 1292 secondary, 1289, 1289F, 1292 size acquisition mechanisms, 1290–1291, 1290F Oogenesis, 1288–1290, 1289F, 1291F Oogonia, 1288, 1290, 1290F Opa membrane protein family, Neisseria, 1520 Open reading frames (ORFs), 490, 551 Operator(s), 433F, 434, 434F lambda, 457–458 Operons, 433F, 462–463 see also also Lac Lacoperon operon (Escherichia coli) Opportunistic pathogens, 1490 Opsin, 1433

Nuclear pore complex(es), 358, 705 mechanism of action, 706–707 mRNA transport, 329F, 358, 359F, 359F, 487 Ran GTPase, 708–709 size exclusion, 705, 706F structure, 358, 359F, 705, 706F visualization, 706–707, 707F Nuclear pores, 200, 201F, 609F see also Nuclear pore complex(es) Nuclear receptor superfamily, 889–890, 891F, 892F Nuclear scaffold see Nuclear matrix Nuclear shuttling protein(s), 709–710 Nuclear transplantation, 411, 413F Nuclear transport receptor(s), 708 Nucleation, of cytoskeletal polymer, 973, 978F, 978F, 992 see also Actin polymerization; Microtubule(s) Nucleic acid(s), 117F biosynthesis, 85, 85F, 86, 87F see also DNA synthesis; RNA,synthesis chemistry, 116–117F DNA see DNA (deoxyribonucleic acid) hybridization hybridization conditions, 535–536, 537F Northern blotting, 538–539, 539F recombinant DNA technology, 532, 537F Southern blotting, 539–540, 539F see also DNA hybridization nucleotide subunits, 61–62 origin of life, 401–402 see also Origin of life; RNA world hypothesis properties, 401 base-pairing see Base-pairing RNA see RNA (ribonucleic acid) structure, 117F Nucleocapsid, viral, 1497F Nucleofilaments, RecA protein–DNA interactions, 307F Nucleoids, 859 Nucleolus, 362–363, 362F 362F,, 363F, 364F ribosome synthesis see Ribosome(s) Nucleoporin(s), 705 Nucleoside triphosphates, RNA polymerization, 334 Nucleosome(s), 211–213, 211–218 30-nm fiber, 211F, 212F see also Chromatin

subnuclear bodies, 363–366, 365F Cajal bodies, 363–364, 364, 365F functions, 364–366 GEMS, 363–364, 364, 365F nucleolus see Nucleolus speckles, 363–364, 365F visualization, 365F transport into/out of see Nuclear–cytoplasmic transport volume, 697T see also entries beginning nucleo-/nuclear Nucleus, egg (ovum), 1287 Null mutation(s), 528F Numb protein, 1358, 1359F Numerical aperture, microscope lens, 581, 582F Nurse cells, 1290, 1290F Nutrient absorption, liver, 1442 N-WASp, pathogen movement, 1516, 1516F Nylon membranes, Northern blotting, 538–539, 539F

Opsonization, 1555, 1555F, 1557T Optical diffraction, 581 Optical sectioning, 590–592, 590F, 592F Optical tweezers, 527 Optic nerve, regeneration, in frog, 1391 Optic tectum, 1391, 1391F Optional introns, 863 ORC see Origin recognition complex (ORC) Organelle(s), 695–697 analysis methods, 509–512 chloroplasts see Chloroplast(s) cytokinesis and, 1098 development, 702, 704 energy converting, 813 see also Chloroplast(s); Mitochondria evolution, 697–699, 700F inheritance, 864–865 membranes, 697T mitochondria see Mitochondria phosphoinositides, 757 position, 697 topological relationships, 700F volume, 696, 697T see also speci specific fic organelles organelles Organic chemistry, 45 Organic molecules (small, cellular), 55 amino acids see Amino acid(s) as building blocks, 56F diffusion rate in cell, 74–75 fatty acids see Fatty acids metabolism, 55 nucleotides see Nucleotide(s) photosynthetic synthesis, 68–70 sugars see Sugars Organism growth cell growth and, 1102, 1108 inhibitory factors, 1110, 1111F total cell mass control, 1102, 1111–1112 see also Development; Multicellularity Organizer (Spemann’s Organizer), 1368, 1370 Organ of Corti, 1430, 1431F Organogenesis, 1347–1363 see also Development; specific organs Organotrophs, 12 Origin of life, 400–408

chromatin remodeling, 432, 433F 212–214, 215–216, core particle, 212F see also Histone(s) DNA interactions, DNA bending, 214F DNA replication, 280, 289–290 dynamic structure, 215–216, 215F histone H1 binding, 218, 218F historical aspects, 220

O Obesity, 1215, 1475 Obligate pathogens, 1490–1491 Occludin, 1153 Occluding junction(s), 1132, 1132F, 1133T see also speci specific fic types Oct1 Pou domain protein, 418T, 425F Octylglucoside, membrane protein solubility, 637 Ocular dominance columns, 1395F Odorant receptor genes, 1430 Odorant receptor proteins, in axon guidance, 1430 Okazaki fragments, 267–268, 269F, 269F, 272, 281F Oleic acid, 114F Olfactory bulb, neural stem cells and neuronal turnover, 1430 Olfactory sensory (receptor) neurons, 917, 1429–1430, 1429F Oligoclonal response, 1545 see also Immune response/system,adaptive Oligodendrocyte(s), 504F, 678 Oligonucleotides, affinity chromatography, 428, 429F Oligosaccharide(s), 55–56, 113F complex, 113F ER processing, 775F Golgi apparatus processing, 773–775, 773F, 775F sialic acid addition, 774F side chain diversity, 636 Oligosaccharyl transferase, 737, 737F 737F,, 747F

DNA as hereditary material, 408 electron transport chain evolution, 871–872, 872–875

lipid bilayers, 405–406 pre-RNA world, 402–403, 402F protein synthesis, 407–408 RNA world see RNA world hypothesis self-replicating molecules

linker DNA, 211

O-linked Olinked oligosaccharide(s), protein glycosylation,

autocatalysis requirement, 401


natural selection, 404–406 polynucleotides, 401–402 polypeptides, 401 see also Catalytic RNA time line, major events, 874F see also Evolution Origin of replication see Replication origin(s) Origin recognition complex (ORC), 287, 288, 288F, 289F, 1068 Orphan receptors, nuclear receptor superfamily, 889 Orthologous genes, 20–21, 20F 20F,, 21F Oscillation

cell-cycle arrest in response to telomere shortening, 1217 DNA binding, 418T, 423, 424F DNA damage checkpoint, 1105, 1106F Mdm2 protein interactions, 1105 modes of action, 1246, 1246F modifications, 187F mutant forms overexpressed, 1246 tumor suppressor, mutated in cancer, 1106, 1127 colorectal cancer, 1251–1252, 1252T deficiency targeted in cancer therapy, 1257 inactivation by DNA tumor virus proteins, 1517–1518


Virus(es) Pathogen-associated immunostimulants, 1526, 1527, 1539 Pathogenesis, definition, 1489–1490 Pathogenicity islands, 1491, 1491F Pathway guidance, of migrating cell, 1045, 1140 neuronal, 1140, 1147, 1177, 1188F, 1385–1389 Pattern recognition receptors, 1527, 1541–1542 dendritic cells, 1536, 1571 pathogen recognition by phagocytes, 1531 Toll-like proteins, 1530–1531 Pax3, 1464 Pax6 (and homologs), eye development, 466, 466F

see Circadian circadian clocks of gene expression in somitogenesis, 1371–1373, 1372F, 1373F Osmium, electron microscopy stains, 606 Osmium tetroxide, EM sample preparation, 605, 605F Osmolarity regulation, 663, 664, 664F, 664FF Ossification, process, 1470–1472, 1471F Osteoblast(s), 1458, 1469–1470, 1470F ECM production, 1179 lineage and formation, 1467F precursor cells, 1470F remodeling of bone, 1473F Osteoclast(s), 1470, 1472, 1472F bone erosion, 1471 cartilage erosion, 1472–1473, 1472F cell crawling, 1036 remodeling of bone, 1473F Osteocytes, 1470, 1470F, 1472F Osteogenesis imperfecta, 1187 Osteogenic cells, 1470F Osteoid, 1469–1470, 1470F Osteopetrosis, 1474

Pachytene, 1275 PAGE see Polyacrylamide gel electrophoresis (PAGE (PAGE)) Pair-rule genes, 1333, 1337–1338, 1337F Pancreas, 1444 Pancreatic exocrine cell(s), organelles, membrane amounts, 697T Pandemics, influenza virus, 1521, 1522F Paneth cells, 1437–1438, 1437F, 1440, 1526F Papanicolaou technique, Cervical cancer, 1212 Papillomas, 1226–1227 Papillomaviruses, 1228, 1228F cancer role, 1228T, 1248 oncogenes (E6 and E7), 1248, 1249F subversion of cell-cycle control, 1248–1249 PAPS see 3¢-Phosphoadenosine-5¢-phosphosulfate (PAPS) Pap smear, 1212 Par3 gene/protein, epithelial apico-basal polarity, 1156–1157, 1157F Par3/Par6/aPKC complex, neuroblast cell division, 1361 Par4 gene/protein, epithelial apico-basal polarity, 1155–1156

Pax7, 1464 1136, 1138T P-cadherin, PCNA protein, 275F PCR see Polymerase chain reaction (PCR) PDGF see Platelet-derived growth factor (PDGF) PDI see Protein disulfide isomerase (PDI) PDZ domains, scaffold proteins, 1148 Pectins, plant cell wall, 1198, 1198F, 1199T P elements, 318T, 480, 556 Pemphigus, 1144 Penicillin, 1521–1522 Pentoses, 112F Peptide-binding groove, MHC protein, 1577, 1578F, 1579F Peptide bonds, 59, 60F bond angles, steric limitations, 127F formation, 128F, 407 hydrolysis, 161 Peptide fragments, immune response, 1581–1585 Peptide-MHC complex, 1577–1579, 1578F, 1579F, 1579F, 1580F see also MHC (major histocompatibility complex) Peptide nucleic acid (PNA), 402, 402F

Osteoporosis, 1474 Ouabain, sodium–potassium pump effects, 663 Ovaries accessory cells, 1290–1292, 1290F, 1290F, 1291F cancer, DNA repair defects, 295T development, 1285, 1288 gap junctions, 1161 Ovulation, meiosis completion after, 1280, 1290, 1292 Ovum see Egg (ovum) OXA complex, 715, 718, 718F Oxaloacetate, 98, 98F, 99, 122F, 123F Oxidation reactions, 71, 71F biological vs combustion, 820F b oxidation, peroxisomes, 722 cellular energy production, 70, 88–103 see also Respiration electron transfers, 72, 828 peroxisomes, 722 Oxidation–reduction (redox) reactions, 828–829, 831 see also Redox potential(s) Oxidative damage, DNA, 296, 296F Oxidative metabolism energetics, 70 glycolysis, 91, 92F see also Glycolysis Oxidative phosphorylation, 819, 819F 819F,, 820F ATP synthesis, 98, 100F, 821–822, 822F, 823 electron transport see Mitochondrial electron transport chain evolution, 870–872, 871F Oxygen atmospheric, 873–874, 874F electron affinity, 832–833 evolutionary significance, 873–875, 874F free radical generation, 833, 874 reduction by cytochrome oxidase, 832–834, 833F requirement for catabolism, 96–97, 817–818 see also Aerobic metabolism toxic compounds, 1532 transport molecules, 256–257 Oxygen-carrying molecules, 256–257 Oxytocin, 1428

Par6 gene/protein, epithelial apico-basal polarity, 1156–1157, 1157F Paracellular transport, tight junction(s), 1152 Paracortex, lymph node, 1550, 1551F Paracrine signaling, 881, 882F, 883 Paralogous genes, 20–21, 20F, 21F Paramecium, in tree of life, 16F Parasegments, Drosophila, 1330 Parasites intracellular, host cell invasion, 1508–1511 parasitic worms, 1489 protozoan, 1494–1495 Parathyroid hormone, 907T Pargenes/proteins, Par genes/proteins, epithelial apico-basal polarity, 1155–1157, 1156F, 1157F see also speci specific fic genes/proteins genes/proteins ParM protein, 990, 990F Parthenogenesis, 1287 Parvoviruses, 1496, 1496F Passive transport, 653, 654F Patch-clamp recording(s), gated channels studies, 680–682, 681F Patched protein, 950, 952F Patch electrodes, 527 Paternity testing, 547F Pathogen(s), 1485–1537, 1539, 1539 colonization of host, 1501–1502 drug resistant, 1521–1524 evasion of host defenses, 1502–1504 evolution (rapid), 1520–1521 facultative, 1490 host behavior modification, 1518 host cell membranes and, 1511–1514, 1511F host cytoskeleton and, 1514–1517 host interactions, 1486–1487 host membrane traffic changes, 1511–1514 host response, signs/symptoms, 1487–1488 human evolution, effects on, 1487 immune response to see Immune response/system infections see Infection(s) infectious process, 1501–1502 intracellular see Intracellular pathogens nonpathogens vs., 1492F obligate, bacterial, 1490–1491

Peptide transporters, class I MHC proteins loading, 1582, 1582F Peptidoglycan(s), bacterial cell wall, 1490F 1490F,, 1527 Peptidyl transferase, 376, 379, 379F 379F,, 407 Peptidyl-tRNA–ribosome binding, 375, 375F Perclock Per clock gene, 462F Perforin, 1573, 1573F Pericentriolar matrix, 1076 Pericytes, 1446F, 1450 Perinuclear space, 705F Periodic table, 49f Peripheral lymphoid organ(s), 1541F, 1543, 1543F Peripheral tolerance, 1587–1588 Periplasmic space, 1490F Peritonitis, 1486 Perlecan, 1165, 1166, 1167F 1167F,, 1184T Permeases see Carrier protein(s) Peroxin(s), peroxisome protein import, 722 Peroxisome(s) electron micrograph, 721F 721F,, 723F enzymes, 721 functions, 696, 721–722 hydrogen peroxide, 721 membrane amounts, 697T b oxidation, 722 oxidative reactions, 721–722 phospholipid import from ER, 745 plasmalogens, 721 production, 723F protein import, 721–723 structure, 721 volume, 697T see also Glyoxysome(s) Per protein, 462F Pertussis, 1503 Pertussis toxin, 906–907, 1503 Petite mutants, 866–867 Peutz–Jeghers syndrome, 1156 PEV (position effect variegation), 221, 221F P granules, 1323, 1323F pH, 52, 109F gradient, 820–821, 821F intracellular, 596 see also Acid(s); Base(s) (chemical) Phagocytic cells, 1531–1534

P P2, cells in C. elegans embryo, 1324–1325, 1324FF p16 (INK4) CKI protein, in cancer, 1243 p21 gene/protein, 1105, 1106F, 1246 p53 gene/protein

opportunistic, 1490 phagocytosis, 1531–1532 phylogenetic diversity, 1488–1489 primary, 1486–1487 recognition by host cells, 1526–1528 requirements to multiply in host, 1487 spread, host behavior modification, 1518 tissue damage, 1488

see also Macrophage(s); Neutrophil(s) 787–789, 1115, Phagocytosis, 26, 27F, 28F, 784F, 1531F antibody-activated, 1555, 1555F bacterial entry into host cells, 1507–1508 complement role, 788, 1528–1529 electron micrographs, 788F induction by bacteria, 1508, 1509F

apoptosis, 1123, 1127

tissue damage, 1488 see also Bacteria; Fungi; Parasites; Protozoa;

induction by bacteria, 1508, 1509F macrophages, apoptosis, 1117

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



pathogens, 1531–1532 process, 1531–1532 resistance mechanisms, 1531–1532 respiratory burst, 1532 Phagolysosome, 1511–1512, 1511F, 1513, 1531–1532 Phagosome(s), 782–783, 787–788, 1452, 1531–1532 Phalloidin, 987, 988T Phase, 581, 583 Phase-contrast microscopy, 504F, 583 Phase transition, membranes, 623 Phase variation, DNA rearrangement, 454–455, 455F

Phospholipid flippase(s), lipid bilayer assembly, 744, 744F Phospholipid scramblase, 627, 744–745, 744F Phospholipid transfer proteins, 745 Phospholipid translocator(s) apoptosis, 627 flippases, 744, 744F lipid bilayer assembly, 622, 743–745 scramblases, 627, 744–745, 744F Phosphorus-32, DNA label, 534 Phosphorylation ATP-mediated, 84F cascades, 895

bacterial, 850F, 853, 854F electron transfer see Photosynthetic electron transport chain(s) evolution, 853 light-harvesting complexes, 848, 848F photosystem I, 851–852, 852F, 853, 854F photosystem II, 851, 851F 851F,, 852F, 853, 854F reaction centers see Photosynthetic reaction centers redox potentials, 852F, 853 structural relationships, 853 see also Chlorophyll(s); Cytochrome(s) Phototrophs, 12

see also Site-specific Phenobarbital, effect onrecombination liver, 1444 Phenol extractions, nucleic acids, 538 Phenotype, 553, 554F analysis, 556–557 see also Genetic screens heritability see Genomic imprinting Phenylalanine, structure, 129F Pheromones, 917 Philadelphia chromosome, in chronic myelogenous leukemia, 1208, 1208F, 1261, 1261F Phorbol esters, as tumor promoters, 1226 Phosphatase(s) see Protein phosphatase(s) Phosphate bonds, 107F bond energies, 93F phosphoanhydride bonds, 61, 93F phosphodiester, 61–62, 93F Phosphate groups, 107F, 175 Phosphate transfer reactions, 80, 84F dephosphorylation, 176, 176F glycolysis, 91, 92F phosphorylation see Phosphorylation see also ATP (adenosine triphosphate); Protein

vs., 180F GTP-binding histone tails, 222, 223F noncyclic photophosphorylation see Noncyclic photophosphorylation oxidative see Oxidative phosphorylation protein see Protein phosphorylation Phosphotyrosine-binding domain (PTB domain, PTB site), 898, 899F Photoactivation, 594–595, 595F, 596F Photochemical reaction centers, 848, 849F 849F,, 854F bacterial, 850, 850F, 853–854 electron transfer, 849 photosystem I, 854F Photophosphorylation, 850–853, 852FF see also Photosystem(s) Photoprotein, 960–961 Photoreceptors (photoreceptor cells), 918F, 1429, 1432–1433, 1433F see also Cones; Rod photoreceptors (rods) Photorespiration, 846–847 see also Carbon fixation Photosynthesis, 69–70, 840–855, 844F, 849–850, 850F

Phototropin, 961 Phototropism, 961 Phragmoplast, cytokinesis in higher plants,

kinase(s); Protein phosphatase(s) Phosphatidylcholine, 618, 619F, 743, 743F Phosphatidylethanolamine, 618, 619F, 743 Phosphatidylinositol (PI), 627, 743, 796–797, 909F, 933 Phosphatidylinositol 3, 4-bisphosphate [PI(3, 4)P2], 1010 Phosphatidylinositol 3¢-kinase (PI 3-kinase),

bacterial, 840, 863, 872–875 see also Cyanobacteria; Purple bacteria carbon fixation (dark reactions) see Carbon fixation chlorophyll photochemistry, 847–848, 847F, 848F see also Chlorophyll(s); Photosystem(s) chloroplast(s), 843–848, 844F cyclic photophosphorylation, 853 electron transport see Photosynthetic electron transport chain(s) noncyclic photophosphorylation, 850–853, 852FF proton-motive force, 853–854 cyclic photophosphorylation, 853 electron-transfer (light reactions) see Photosynthetic electron transport chain(s) energetics, 68–70 equation, 70 evolution, 840–841, 853 bacterial, 872–875 noncyclic photophosphorylation see Noncyclic photophosphorylation photosystems see Photosystem(s) relation to respiration, 70, 70F stages, 69, 70F see also speci specific fic components components Photosynthetic electron transport chain(s), 827F, 843–844, 844F, 849–850, 850F, 852F, 873F across thylakoid membrane, 852F see alsoThylakoid(s) alsoThylakoid(s) electron carriers, 850–853, 852F evolution, 872–875 mitochondrial electron transport vs., 815F, 853–854, 855F reaction centers, 848, 849–850, 850F redox potentials, 852F, 853 water-splitting enzyme, 851, 852F, 873 Z scheme, 852 see also Carbon fixation; Chloroplast(s) Photosynthetic organisms, 840 bacteria, 840, 863 evolution, 872–875 see also Cyanobacteria; Purple bacteria

1360F Plant(s) comparative anatomy, C3 vs C4 plants, 846–847, 847F development see Plant development; Plant development and growth evolution, 36, 840–841 extracellular matrix, 1180, 1195 flowering, recent evolutionary origin, 36 Arabidopsi dopsiss thalia thaliana na as model organisms see Arabi (wall cress) plasmodesmata, 1158, 1162–1163, 1163F transgenic, 568–569, 569F, 570F Plant cell(s), 846 bundle-sheath cells, 846 carbon fixation see Carbon fixation; Photosynthesis cell differentiation, genome preservation, 411, 413F cel walls see Plant cell wall centrosome lack, 1081 culture, 504–505, 568 cytokinesis in, 1097–1098, 1097F, 1098F development see Plant development and growth division, 1195 evolutionary origin, 29 mesophyll cells, 846 microtubules, 1097–1098, 1200–1202, 1200F 1200F,, 1201F photosynthetic organelles see Chloroplast(s) plasticity, 5568 plastids, 841–842, 841F totipotency, 568 transformation, 570F turgor pressure, 1197 vacuoles see Plant vacuoles Plant cell wall, 1195–1202 composition/structure, 1199F cell type and, 1195–1197 cellulose, 1180, 1196, 1197–1198, 1197F, 1198F cross-linking glycans, 1196, 1198, 1198F, 1199T lignin, 1195, 1196, 1199T pectins, 1198, 1198F, 1199T


actin organization, 1043F, 1046 extracellular signaling, 627, 627F growth factor signaling, 1108, 1109F Phosphatidylinositol 4, 5-bisphosphate [PI(4, 5)P2], 909, 909, 910F, 911FF Phosphatidylinositol 4-phosphate [PI(4)P], 910F Phosphatidylinositol-specific phospholipase C, 630 Phosphatidylserine, 618, 619F, 626, 788, 1117 3’-Phosphoadenosine-5’-phosphosulfate (PAPS), 776, 776F Phosphoanhydride bonds, 61, 93F Phosphodiesterase, base excision repair (BER), 299F Phosphodiester bonds, 61–62, 93F 93F,, 199F Phosphoenolpyruvate, 121F Phosphofructokinase, 120F Phosphoglucose isomerase, 120F 2-Phosphoglycerate, 121F 3-Phosphoglycerate, 91, 92F, 121F Phosphoglycerate kinase, 91, 121F Phosphoglycerate mutase, 121F Phosphoglyceride(s), 618, 618–620, 619F see also individual molecules Phosphoinositide-dependent protein kinase I, 934 Phosphoinositide kinases, 757, 757F Phosphoinositides see Inositol phospholipid(s) Phosphoinositol (PI), 757, 757F Phosphoinositol kinases, 757, 757F Phospholipase(s), 627 see also specific phospholipases Phospholipase C (PLC), 909, 910F, 1299 Phospholipid(s), 9, 618 aggregates, 115F amphipathic molecules, 58–59 bilayers, 59F, 405–406, 407F see also Lipid bilayer(s) biosynthesis, 58, 867–868


Phylogenetic footprinting, 431, 431F Phylogenetic tree(s), 16F 16F,, 247, 247F 247F,, 248 Physical gene mapping, 560, 560F Phytochrome, 960–961, 961F PI see Phosphatidylinositol (PI) PI 3-kinase see Phosphatidylinositol 3¢-kinase (PI 3-kinase) Pigment cells, fish, 1023–1024, 1024F Pili, 1490F Pilin protein, Neisseria, 1520 Pineal gland, circadian clock, 461 Pinocytosis, 787, 789–790, 789F Pit fields, 1162 PKC see Protein kinase C (PKC) Placenta, 1379 Placodes, 1384F Plague, bubonic, 1502, 1502F Plakoglobin (g-catenin), -catenin), cadherin binding, 1142 Planar cell polarity, 1157–1158, 1157F, 1358, 1359F,


cell 62F lipidmacromolecules, droplets, 625–626 membrane composition, 618–620 properties, 620 structure, 58–59, 59F, 114F, 618 synthesis, ER, 743–745 see also speci specific fic molecules molecules

evolution, 840–841, plants see Plant(s) Photosynthetic reaction centers, 848, 849F, 854F bacterial, 642, 642F electron transfer, 849–850, 850F photosystem II complex, 642 redox potentials, 852F

proteins, 1198, development and 1199T growth, 1195–1197, 1196F actin filaments and, 1202 microtubules and, 1200–1202, 1200F orientation of deposition, 1199–1200 primary cell walls, 1195, 1197–1198, 1198F secondary cell walls, 1195, 1196

Phospholipid exchange proteins, endoplasmic reticulum (ER), 745

Photosystem(s), 848 antenna complex, 848, 848F

functional roles and specialization, 1196 1197, 1197F


compression resistance, 1196 tensile strength, 1196, 1197, 1199 plasmodesmata, 1162–1163, 1163F Plant development and growth, 1398–1415,


Polar covalent bonds, 50, 51F Polar ejection force, 1085, 1086F Polarity/polarization, 1042 cytoskeleton and, 969, 974–975, 1044, 1046 developmental, 1364 see also under Drosophila development DNA strands, 3F epithelia apico-basal polarity mechanisms, 1155–1157, 1155F, 1156F epiethial cells, 798, 799F, 806F planar cell polarity mechanisms, 1157–1158, 1157F

Polysaccharides, 56, 113F biosynthesis, 85, 85F cell macromolecules, 62F digestion, 88F, 164–165 Polyspermy,, 1300 Polyspermy Polytene chromosome(s), 236–238 chromosome puffs, 220–222 Drosophila melanogaster, 38, 38F, 236–237, 236–238, 237FF deconvolution microscopy, 590F gene expression, 220–222 histone modifications, 238F insulator-binding, 413, 453F

805–806 exocytosis control, kinetochore, 1075–1076, 1076F mitotic spindle, 1077–1078, 1081–1082 neutrophil(s), 1045F, 1046F Saccharomyces cerevisiae, 1044 T cell(s), 1047, 1573 tissues, 1155 Yeast budding, 880, 1044, 1045F Polar molecules, 52–53 Poleward flux, 1035, 1035F Poliomyelitis, eradication by vaccination, 1498F Poliovirus, 1496F, 1513–1514, 1515F capsid, 149F entry and uncoating, 1506F, 1507 host cell transcription shut-off, 1517 structure, 1489F TFIID cleavage, 1517 Pollen, 592F, 1269 Polo-like kinases, 1074 Pol proteins, translational frameshifting, 383, 384F Poly-A-binding protein, 357F Polyacrylamide, 517 Polyacrylamide gel electrophoresis (PA (PAGE), GE), 517

microscopy, 590F see also Chromosome structure RNA synthesis, 239F visualization, 236 see also Chromosome puffs Polyubiquitylation, 795 Polyvalent antigen(s), 1557 Pop1 gene regulatory protein, 1325 Pop (plenty of pharynx) mutants, 1325 Porin(s), 144F, 635, 667, 707, 707F, 717, 717F Porphyrin rings, heme groups, 830F, 831 Porphyromonas gingivalis, chronic illness, 1500 Positional information, imaginal discs, 1351 Positional value, 1312–1313, 1392–1393 Position effects, 221, 221F Position effect variegation (PEV), 221, 221F Positive feedback control, 901, 901F cell asymmetry, 1314–1315 cell memory, 458, 458F 458F,, 466 conformational coupling, 171, 172F epigenetics, 471, 472F transcription circuits, 459, 459F Positive selection, in thymus, 1585–1586, 1586F,

universality, 9–10 see also Membrane(s) Plasmid(s), 21, 540–541, 541FF, 1491–1492, 1491F, 1492F Plasmin, 1194 Plasminogen, 1194 Plasminogen activators, 1194 Plasmodesmata, 1158, 1162–1163, 1163F Plasmodium falciparum, 1494–1495 antigenic variation, 1519 life cycle, 1495F 1495F,, 1502 mitochondrial DNA, 859 time-dependent transcription, 1495F transmission and vector, 1494–1495, 1501–1502 see also Malaria Plastid(s), 696, 841–842 amyloplasts, 841, 841F chloroplasts see Chloroplast(s) development, 698, 699F, 841 diversity, 841F etioplasts, 841 evolution, 699 genomes, 855–856 growth and division, 857–858 leucoplasts, 841 Plastocyanin, 852F Plastoquinone, 852F Platelet(s), 1102, 1102F, 1174 Platelet-derived growth f actor (PDGF), 923T, 925F, 925F, 1102, 1441, 1450 Pleckstrin homology (PH) domain, 933 Plectin, 995F, 1005, 1006F Ploidy variation, 38–39, 39F 39F,, 255, 1111, 1111F 1111F,, 1112F

2D-PAGE, 414F, 521–522 DNA sequencing gels, 534, 535F gel-mobility shift assay, 426–427, 428F SDS-PAGE, 517, 518F, 637 staining, 517, 518F Polyadenylation (mRNA 3¢ end), 346, 357–358, 357F CPSF protein, 357–358, 357F CstF protein, 357–358, 357F cytoplasmic, 493 deadenylation-mediated mRNA decay, 492, 492F messenger RNA 3¢ end, 357–358, 357F nonretroviral transposons, 318T nonsense-mediated mRNA decay, 386 poly-A-binding protein, 357F poly-A polymerase, 357F, 358 post-transcriptional gene regulation, 370–371, 372F Poly-A polymerase, 357F, 358 Poly-A tails see Polyadenylation (mRNA 3¢ end) Polycistronic mRNA, 380 Polyclonal response, 1545 see also Immune response/system; Immunoglobulin(s) Polycomb group, 1344, 1345F Polygenic traits, 563 Polyisoprenoid(s), 115F Polymerase chain reaction (PCR), 544–546, 545F, 546F, 547F Polymerases DNA see DNA polymerase(s); DNA replication RNA see RNA polymerase(s) thermophilic, 544 see also DNA replication; specific enzymes Polymerization reactions actin see Actin polymerization DNA see DNA replication energetics, 84–87 head polymerization, 86, 87F, 373 tail polymerization, 86, 87F see also Macromolecule(s) Polymorphism, MHC proteins, 1575, 1588 Polymorphonuclear leucocytes see Neutrophil(s) Polynucleotides DNA see DNA (deoxyribonucleic acid) origin of life, 401

1587F Positive supercoiling, 344F, 345 Post-capillary venule, 1549, 1549F, 1551F Postsynaptic potential (PSP), 689F Post-transcriptional regulation, 477–499, 477F alternative splicing, 479–480 immunoglobulin genes, 370, 482–483 m RNA polyadenylation, 370–371, 372F RNA localization control, 379F, 415 RNA processing control, 379F, 415, 477–485 see also Splicing RNA transport control, 379F, 379F, 415, 485–486 seeTranslational translational see Translational control of gene expression Post-translational modification, 388F collagens, 1186, 1187F covalent, 388F see also Protein glycosylation; Protein phosphorylation elastin, 1190 function regulation, 186–187, 186T noncovalent, 388F see also specific modifications Potassium channel(s) (K+ channel) bacterial, structure, 671–673, 672F chloride channel vs., 674F conductance, 671 gating, 672 leak channels, 669 selectivity filter, 673F voltage-gated see Voltage-gated potassium channel(s) Potassium leak channels (K+ leak channels), 669 POU-domain, structure, 425F Power stroke, of myosin, 1016 Poxviruses, 1496, 1496F Pre-B cell, 1553 Precursor oligosaccharide(s), 737, 737F, 747F Preimmune antibody repertoire, 1562 Preinitiation complex, 1067 Premature ageing, DNA repair defects, 295T Pre-mRNA modifications capping see 5’ Capping of eucaryotic mRNA mRNA hnRNP packaging, 353F, 358 polyadenylation see Polyadenylation (mRNA

Pluripotent hemopoietic origin, 1543stem cells, lymphocyte Plus end tracking proteins (+TIPs), microtubule formation, 995F, 1004, 1004F PNA (peptide nucleic acid), 402, 402F Pneumocystis carinii, antigenic variation, 1519 Point mutations, 246

see also RNA properties, 401 world hypothesis RNA see RNA (ribonucleic acid) see also Nucleic acid(s) Polypeptide backbone protein models, 132F Polypeptides see Protein(s) Polyprotein(s), 803

splicing see3’end) Splicing Pre-pro-protein(s), 803 Prereplication complex (pre-RC), 1067–1068, 1068F Pre-replicative ORC complex, 288 Pre-RNA world, origin of life, 402–403 Presenilin, 947


Arabidopsis see Arabidopsis thaliana (wall cress) cell signaling, 1409–1410 under Plant cell cell wall formation, 1196F see underPlant wall egg (zygote), asymmetric division, 1400 embryogenesis, 1400, 1401F, 1402F environmental influences, 1403 flower development, 1413–1414, 1413F, 1414F hormonal signals, 1406F long-range, 957, 1403, 1406, meristems see Meristem(s) microtubules and, 1200–1202, 1201F plant module growth from primordia, 1407–1408

regulatory mutations in maize, 1410–1412, 1411FF repetitive patterning, 1408F sequential, by meristems, 1403 sexual reproduction, haploid cells, 1270 shaping and by oriented cell division, 1406 signals for seedlings, 1399F 1399F,, 1401, 1403 turgor pressure and, 1197, 1199 Plant hormones (growth regulators), 957, 1403, 1406, 1406F Plant modules, 1407–1408 Plant vacuoles, 781–782, 781F, 782F Plant viruses, plasmodesmata and, 1163 Plasma cells (effector B cells), 1543, 1544F, 1547, 1552 see also B cell(s) Plasmalogen(s), 721, 722F Plasma membrane(s), 9, 617 actin filament contact, 1009–1010, 1010F actin filament nucleation, 996–998 domains, tight junctions, 1151 enlargement, regulated secretory pathway (exocytosis), 805, 806F lipids see Lipid bilayer(s) origin, 405–406, 407F, 408F proteoglycans, 1183–1184 protrusion driven by actin polymerization, 1037–1039

Point spread function, 590 Polar body, 1289, 1289F

Polyribosome(s), 381 382, 382F, 728, 730 see also Ribosome(s)

Presomitic mesoderm, 1371 Prickle cells, 1419, 1419F

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



Primary antibodies, immunofluorescence microscopy, 588 Primary antibody response, 1546F see also Immune response/system,adaptive Primary cell walls, 1195, 1197–1198, 1198F Primary cilium, 899 Primary cultures, 504 Primary immune response, 1546, 1546 see also Immune response/system, adaptive Primary lymphoid organ see Central lymphoid organ Primary oocytes, 1288, 1289F Primary pathogens, 1486–1487 Primer strand, DNA synthesis, 267F,, 268F 267F Primordial follicle cells, 1291, 1291F Primordial germ cells (PGCs), 1282–1286 migration into developing gonad, 1283, 1283F, 1285, 1288 pluripotency, 1283 specification by germ cell determinants, 1282, 1282F specification by neighboring cells in mammals, 1282–1283

Primosome, 276, 282, 283F Prion diseases, 397–398, 397F Prion proteins (PrP), 1489, 1498–1499 conformational change, 397F, 398 fungi, 398 infectivity, 397–398 misfolding/aggregation, 397–398 neural degeneration due to, 1498, 1499F normal cellular PrP PrP,, 397–398 positive cellular roles, 398 replication, 1498 structure and aggregation, 1498–1499 Procaryotes, 14 cells, 14–15, 14F, 15F diversity, 15 DNA methylation see DNA methylation gene expression, 345F mRNA, 346F, 380, 381F, 488 repressors see Repressor protein(s) transcription see underTranscription Transcription transcriptional control, eucaryotes vs., 434–436 protein synthesis, 345F, 380 strand-directed mismatch repair, 277 Translation initiation, 1527 see also Archaea (archaebacteria); Bacteria Procaspase(s), 1118, 1119F, 1120F, 1121, 1573F, 1574 Processing bodies (P-bodies), 494, 495F Procollagen, 1186, 1187 Profilin, 999–1000, 999F, 1000F Progenitor cells, 1386F 1386F,, 1456–1458 see also Stem cell(s) Programmed cell death see Apoptosis (programmed cell death) Proinsulin, 151, 152F Projection, retinotectal, 1391 Proline, 129F, 1187, 1187F Prometaphase, 1072F, 1080, 1086 Promiscuous recombination, 315–316 Promoter elements, 336, 338–339 asymmetry, 339, 339F bacterial, 37F, 336–337, 338–339, 338F eucaryotic, 440 CG (CpG) islands, 434, 470–471 consensus sequences, 339 transcriptional integration, 449–450, 450F Promoters, inducible, 564 Pronuclei fusion, 1301, 1301F 1301F,, 1302F Proofreading by DNA polymerase, 269–270, 270FF see also Mismatch repair Proopiomelanocortin, proteolytic processing, 803F Pro-peptide(s), 803 Prophase meiosis, 1091–1092, 1274, 1275–1276, 1276F mitosis, 1054, 1072F, 1078–1079, 1080 see also Mitotic spindle Proplastids, 698, 841 Prospero protein, Protease(s), 1183, 1361 1194, 1194F see also Proteasome(s) Protease inhibitors, regulation, 1183 Proteasome(s), 391–394, 392F antigen processing/presentation, 1582, 1583F misfolded protein degradation, 740F

structure, 392–393, 392F see also Ubiquitin pathway Protein(s), 125–194 abundance in cells, 62F aggregation see Protein aggregation allosteric, 171, 172–173 see also Allosteric regulation analysis methods see Protein analysis assemblies see Protein complexes (assemblies) basic principles, 5 binding site(s), 142, 153–157 see also Active site; Protein complexes (assemblies)

Protein purification Protein-coding RNA, transcription, RNA pol II, 340T Protein complexes (assemblies), 142–143, 145F assembly, 148–152 assembly factors, 151 dimers, 142, 142F phosphorylation effects, 175 ribosomes, 149 self-assembly, 149–151 viruses, 148, 148F, 149 cooperativity, 172–173, 173F see also Allosteric regulation eucaryotic gene-regulatory proteins complexes,

5–6, 6F as catalysts, see also Enzyme(s) chemical synthesis, 548 classification, 138–139 conformational changes see Conformational changes crystals, 528, 528F degradation see Proteolysis denaturation, 130, 517 DNA interaction see Protein–DNA interactions evolution see Protein evolution families see Protein families fibrous, 145–146 see also speci specific fic types folding see Protein folding functions see Protein function gene regulation by see Gene regulatory protein(s) GFP tagging for visualization in living cells, 592–593, 594F globular, 143, 145 glycosylation see Protein glycosylation identification see Protein identification

447, 447FF protein-to-protein binding, 141F, 142–143, 143F see also Protein machines; Protein–protein interactions Protein databases, 139, 139F Protein disulfide isomerase (PDI), 736 Protein–DNA interactions, 144F binding site prediction, 426 common interactions, 426, 427 DNA structure effects, 416–417 see also DNA structure enhancesome, 447, 447F gene regulatory proteins, 416–417, 417F, 417F, 418–419, 419F histones, 212–213 Rad51 protein, 307F RecA protein, 307F replication initiation, 282 RNA polymerases, structural changes and, 336–337, 338 see also DNA-binding motifs; DNA-binding proteins Protein evolution, 136–142

as machines see Protein machines macromolecular subunits, 148 modules, 136, 136F, 140–141, 140F phosphorylation, 175, 187 see also Protein structure,domains motor see Motor protein(s) movements (shape changes), 179–181, 181F nonprotein components, 166–167 phosphorylation see Protein phosphorylation protein interaction see Protein–protein interactions quality control, 390–391, 391F under Protein analysis sequencing see underProtein shape/size, 131 see also Protein structure sorting see Protein sorting stability, 137, 147F structure see Protein structure subunits, 141F, 142–143, 142F, 143F, 148 see also Protein complexes; Protein–protein interactions synthesis see Protein synthesis translocation see Protein transport Protein aggregation CNS vulnerability, 397 human disease, 397–398, 397F proteolytic resistance, 397 state, epigenetics, 472F see also Prion diseases Protein analysis chromatography, 512–514, 513F, 514F, 515F dynamics, visualization by GFP tagging, 593, 594F electrophoresis, 518FF 2D-PAGE, 521–522, 521–522, 521F, 522FF isoelectric focusing, 522F Western blotting, 518, 519F hydrodynamic measurements, 522–523 mass spectrometry, 519–521, 520F protein–protein interactions, 523–524, 524F 524F,, 525–526, 525F proteomics, 519 sequencing homology searches, 139, 139F ligand-binding site identification, 155

amino acid changes, 137, 264, 265 domain fusion, 560F domain shuffling, 140–141, 140F, 257, 257F facilitated by introns and splicing, 257, 348 modules, 140–141, 257 see also Immunoglobulin superfamily mutation rates, 264 protein families, 137–139, 155–156 see also Gene families sequence homology, 138, 138F, 139, 155–156 unit evolutionary time, 265 Protein expression vectors, 546, 548, 548FF Protein families, 137–139 evolutionary tracing, 155–156, 155F sequence homology, 138, 138F, 139, 139F structural resemblance vs sequence resemblance, 138–139, 138F see also Gene families; specific types Protein folding, 126, 387–390, 1498–1499 abnormal, 391, 391F, 397–398 see also Prion proteins (PrP); Proteolysis amino acid side-chain role, 130, 130F binding site creation, 154F calreticulin and calnexin, 738–739 chaperones, 388–390, 390F, 738–739, 739F, 767 see also Chaperones constraints, 126 co-translational, 387–388, 388F energetics, 130–131 ER, 736 ERp57 role, 739F glucosyl transferase role, 739, 739F misfolded proteins, 739–741, 740F molten globule, 387–388, 388F monitoring, 738–739 N-linked -linked glycosylation role, 737F 737F,, 747F noncovalent interactions, 64, 64F 64F,, 126–127, 130F pathways, 388F prion proteins, 1498–1499 see also Prion proteins (PrP) quality control, 390–391, 391F, 767–768 refolding, 131, 131F, 391, 391F see also Chaperones relation to synthesis, 387 Protein function, 152–196

mass spectrometry, sequence alignment,519–521 531, 531F see also DNA sequencing structure determination, 139, 517–532 NMR studies, 139, 529–530 nuclear magnetic resonance, 139 SDS-PAGE, 517

enzymes see Enzyme(s) phosphorylation effects see Protein phosphorylation protein–ligand binding see Protein–ligand interactions structure–function relationship, 154–155 Protein glycosylation, 388F 388F,, 736–738, 737F, 747F

processivity of proteolysis, 392, 392F protein quality control, 391–393, 767

X-ray diffraction, 139, 527–529, 528F see also Microscopy; Protein identification;

see also Endoplasmic reticulum (ER) Protein identification, 519–532


mass spectrometry, 519–521 see also Protein analysis; Protein purification Protein interaction maps, 188–190, 189F, 190F Protein kinase(s), 176–178, 895 Cdk inactivation, 1063–1064, 1064F, 1066T evolution, 176, 177F regulation, “microchips,” 177–178, 177F, 179F sequence homology, 176, 177F structure, 141, 176F seeTyrosine tyrosine kinases see Tyrosine kinase(s) see also indiv individual idual enzymes Protein kinase B (Akt; PKB), 934, 1244 Protein kinase C (PKC), 185, 626, 911 Protein–ligand interactions, 153 amino acid sidechains, 154–155, 154F, 155F antigen–antibody see Antigen–antibody binding binding sites, 153, 153F 153F,, 154F, 155F binding strength, 157–158 see also Equilibrium constant (K) cooperativity, 172–173, 173F see also Allosteric regulation enzyme–substrate see Enzyme–substrate interactions linkage, 171–172, 172FF noncovalent interactions, 153, 153F, 154, 154F, 155F regulation, 169–170 allostery see Allosteric regulation specificity, 153 water exclusion, 154 see also Protein–DNA interactions; Protein–protein interactions Protein machines, 184–186 activation, 185–186 gene minimization, 184–185 interchangeable parts, 184–185

Protein structure, 59–60, 125–152 amino acid sequence, 125–137 see also Amino acid(s) analysis, 139 components, 126F computational analysis, 139, 139F conformation, 130–131, 154–155, 154F, 155F see also Allosteric regulation; Conformational changes core structure, 131, 135, 135F C-terminus, 59, 126F 126F,, 482–483 depicting, 132–133FF, 144F determination, 139, 517–532 SDS-PAGE, 517 139, 527–529, 528F X-ray diffraction, domains, 131, 136, 348 3-D models, 131, 132–133FF 132–133FF,, 137F evolutionary tracing, 155–156, 155F 155F,, 257F fusion, 560F large kinase domain, 136F modules, 140–141, 140F paired, 141 SH2 domain, 131, 132–133FF 132–133FF,, 136F, 155, 156 SH3 domain, 136F helical filaments, 143, 144F 144F,, 145, 145F actin, 145F see also Actin/actin filaments assembly, 145F electron microscopy, 610F handedness, 143 limited fold numbers, 136–137 membrane spanning regions, 135 noncovalent forces, 126–127 N-terminus, 59, 126F polypeptide backbone, 125 primary structure, 136


chloroplasts see Chloroplast(s), protein import endoplasmic reticulum see Endoplasmic reticulum (ER), protein transport gated, 700, 701F general flow, 701F mitochondria see Mitochondrial protein import nucleus see Nuclear–cytoplasmic transport between organelles, 699–701 peroxisomes see Peroxisome(s), protein import signal hypothesis, 726–727, 727F, 728F studies, 703F through secretory pathway, 749–787 see also Protein sorting; Transmembrane

position in cell, 185–186, 186F scaffold proteins, 184–185, 185–186 structure, 184 see also Protein complexes (assemblies) Protein microarrays, 188 Protein modules, 140–141, 175–176 Protein motifs, DNA-binding motifs see DNAbinding motifs (proteins) ‘Protein-only inheritance,’ yeast, 398, 398F Protein phosphatase(s), 176–177, 176F, 895 Cdk activation, 1063, 1063F, 1066T, 1074–1075 5’ mRNA capping, 347F, 347F, 3446 protein tyrosine phosphatases (PTPs), 938–939 Protein phosphorylation, 175–178 ATP as phosphate donor, 84F energetics, 177 enzymes involved, 176, 176F see also Protein kinase(s); Protein phosphatase(s) functional effects, 175–176, 186–187, 187F gene regulatory proteins, 450, 451F GTP-GDP exchange as alternative to phosphorylation, 178–179 GTP-mediated see GTP-binding proteins (GTPases) phosphorylation cycles, 177 phosphorylation site as recognition signal for protein binding, 175–176 Rb protein regulation, 1104 Protein–protein interactions, 187–190 analysis methods, 523–527 dimerization, 142 interface types, 156, 156F map construction, 188–190, 524 optical methods, 524–526 quaternary structure, 136 SH2 domains see SH2 domain (Src homology 2 domain) single molecules, 526–527 subunits, 140F, 141F, 142–143, 148F Protein purification chromatography, 512–514, 515F, 535F electrophoresis, 517, 518FF, 521–522, 522FF Western blotting, 519F see also Protein analysis; Recombinant proteins

coding, 199–200, 199F, 200F see also Genetic code prediction, 550–551 quaternary structure, 136 secondary structure, 136 a helix, 131, 134F, 135, 135F b sheets, 131, 134F, 135, 135F, 422, 423F stability, 137, 147–148, 147F structure–function relationship, 154–155 subunits, 140F, 141F, 142–143, 143F tertiary structure, 136 unstructured polypeptide chains, 146–147 see also Peptide bonds; Protein folding Protein structure–function relationship, 154–155 Protein synthesis, 85, 85F 85F,, 366–400 elongation cycle, 373, 373F, 376F, 376F, 377F elongation factors, 179–180, 377–378, 377F peptidyl transferase, 376, 379, 379F steps, 375–376, 376F under Endoplasmic reticulum (ER) ER and see underEndoplasmic eucaryotic, 345F, 380, 380F, 399F evolution, 407–408 experimental analysis, cell-free systems, 512 inhibitors, 384, 385T see also Antibiotics initiation, 379–380, 380F levels of regulation, 399 location see Ribosome(s) peptide bond formation, 59, 60F, 125, 373F post-translational alterations see Posttranslational modification procaryotic, 345F, 380 reading frames, 368, 368F relation to DNA see Gene expression; Genetic code; Messenger RNA termination, 381, 381F see also Protein folding; Translation Protein tags affinity chromatography, 515F cleavable, 515 GST, 514–515, 516F histidine tag, 548 see also Affinity chromatography; Epitope tagging Protein translocation, 703F

protein(s); transport seeTyrosine see Protein tyrosine kinases Vesicular Tyrosine kinase(s) Protein tyrosine phosphatases (PTPs), 938–939 Proteoglycan(s), 1184T aggregates, 1182, 1182F, 1183F assembly/synthesis, 775–776, 1181, 1181F basal lamina, 1165 cell surface co-receptors, 1183–1184 connective tissues, 1179, 1181–1182 membrane proteins, 636 as molecular sieves, 1182–1183 protein regulation by, 1182–1183 sizes, 1181–1182, 1181F see also speci specific fic types Proteolysis, 391 apoptosis (programmed cell death), caspases see Caspase(s) cell cycle control, 1064 degradation signals, 396F insulin, 151, 152F protein aggregate resistance, 397 regulated destruction, 395–396, 396F regulatory function, 395–396 see also Proteasome(s); Ubiquitin pathway Proteomics, 188 Protists, 32–34, 33F Protocadherins, 1136, 1138T Protofilament, 971–972, 972F Proton see Hydrogen ion (H+, proton) Proton gradients see Electrochemical proton gradients Proton-motive force, 821, 821F, 853–854 Proton pumps, 827–828, 829F allostery, 836 atomic detail, 835 bacteriorhodopsin, 640–642 evolution, 871 general mechanism, 837F lysosomes, 780, 780F photosynthesis, 851, 854 redox potentials, 835, 835F see also Respiratory enzyme complexes Proto-oncogenes, 1231, 1237, 1237F Protozoa, 28F, 32–33 as parasites, 1494–1495, 1508–1511 Protrusion, in cell movement, of actin meshwork at leading edge, 1039F Prox1 protein, 1448 P-selectin, 1145–1146 Pseudogenes, 248, 255, 257 Pseudoknot, RNA structure, 403F Pseudomonas aeruginosa, 1491 Pseudopodia, 1037 Pseudouridine, transfer RNA modification, 368F P-site (ribosome binding), 375F, 376 Psychoactive drugs, 686, 690 PTB domain (phosphotyrosine-binding domain), 898, 899F, 925 PTEN phosphatase (tumor suppressor), 933 P-type pumps (ATPases), 659, 660F see also Calcium pump; Sodium–potassium pump (ATPase) Puberty, 1288–1289, 1292, 1293 Puffer fish (Fugu rubripes), 30, 31F, 251F Pulse-chase experiments, 602, 602F Pulsed-field gel electrophoresis, 534 Puma, apoptosis, 1123 Pumps see Carrier protein(s)

Protein apicalsorting domain, 806–807 basolateral domain, 807 endosomes, 807F glycosphingolipids, 807 lipid rafts, 807 signals, 699, 701–702, 701F, 702T, 703F

across chloroplast membranes, 719–720 see also Chloroplast(s),protein import across mitochondrial membranes, 713–718 see also Mitochondrial protein import in endoplasmic reticulum see Endoplasmic reticulum (ER) Protein translocators, 714–715

Pupa, Drosophila, 1329 Purifying selection, 247 Purine base(s), 61, 116F depurination, 296, 297F see also Adenine; Guanine Purkinje cell, intracellular calcium, 597F Puromycin, 384, 385T

trans Golgi network, 807F Protein stains, Coomassie blue, 517, 518F

Protein transport across membranes, 695–748

Purple bacteria mitochondrial evolution, role, 860

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



photosynthetic reaction centers, 827F, 850, 850F, 854F Pus, 1531 Pyranosyl-RNA (p-RNA), 402F Pyrimidine base(s), 61, 116F see also Cytosine; Thymine; Uracil Pyrophosphate release, DNA synthesis, 268F Pyruvate anaerobic breakdown, 89–90, 90F citric acid cycle, 122F glycolysis, 88, 89F, 121F oxidation to acetyl CoA, 96, 96F transport, 822

Reaction coupling, 75F, 78F, 78F, 824–825 activated carrier formation, 79–80 ATP role, 81 glycolysis, 91 mechanical model, 80F see also Free energy Reading frames open see Open reading frames (ORFs) protein synthesis, 368, 368F RecA protein homologous recombination, 306–307, 307F synapsis, 307–308, 307F homologs, 307–308, 307F, 308F

Recombination complex, 1280 Recombination signal sequences, V(D)J joining, 1564F Red blood cell(s) see Erythrocyte(s) Redox pairs, 828 Redox potential(s), 828–829, 830F concentration changes, 830 DG calculation, 830 electron transfer, 829, 831, 835, 835F, 852F, 852F, 853 measurement, 830, 830F standard, 830T Reduction–oxidation (redox) reactions, 828–829, 831

Pyruvate carboxylase, biotin Pyruvate decarboxylase, 96F use, 84F Pyruvate dehydrogenase complex, 96, 96F Pyruvate kinase, 121F

Brca1/Brac2interactions, proteins, 310 protein–DNA 307F Receptor(s) cell-surface see Cell-surface receptor(s) down-regulation, 795 editing, 1548, 1548F 1548F,, 1565, 1565 see also Immunological tolerance intracellular, 881, 881F see also Nuclear hormone receptor(s) ligand-gated ion channels see Ligand-gated ion channel(s) see also Receptor-mediated endocytosis; specific types Receptor guanylyl cyclases, 922 Receptor-like tyrosine phosphatase, 922 see also Protein tyrosine phosphatases (PTPs) Receptor-mediated endocytosis, 784, 791–799 EGF uptake, 794 extracellular macromolecule import, 791–792, 793F iron uptake, 794 material degradation, 793F membrane protein sorting, 794F receptor recycling, 792–794, 793F signal peptides, 792 transcytosis, 793F 793F,, 797–798, 797F Receptor proteins see Receptor(s) Receptor serine kinase family, evolution, 177F Receptor tyrosine kinases (RTK), 922–924, 923F, 923T, 924FF, 925, 925F animal development, 1316F docking with SH2-domain proteins, 924–925, 924F, 925F Ras pathway activation, 926–930, 928F, 929FF Recessive mutation(s), 558 Reclinomonas, 862 Recombinant DNA technology, 532–553 basic principles, 532 DNA cloning see DNA cloning DNA labeling, 534, 536F see also DNA probe(s) DNA libraries, 540–542, 541–542, 542F, 543F DNA microarrays, 537 DNA sequencing see DNA sequencing electrophoresis see Electrophoresis historical aspects, 532, 533T human replication origin identification, 288 see also Human genome nucleic acid hybridization, 532, 537F, 538F, 538F, 539F in situ hybridization, 532 PCR, 544–546, 545F, 546F protein production see Recombinant proteins reporter genes see Reporter gene(s) restriction enzymes, 532, 532–533, 534F RNA production, 546 site-specific recombination applications, 325–326 seeTransgenic transgenic organisms see Transgenic organism(s) see also Genetic engineering; Recombinant proteins; specific techniques Recombinant proteins applications, 546, 548 expression vectors, 546, 548F protein tags, 514–516, 548 see also Protein purification Recombination, 263, 305F, 554F antibody chains, 1564–1565 DNA repair role, homologous end-joining (DSB

Reduction reactions, 71F, 828 39 Redundancy, genetic,71–72, coli replication, 282, 284F Refractory period, E. colireplication, Regeneration basal lamina and, 1168–1169, 1168F intercalary, 1354, 1354F optic nerve, in frog, 1391 skeletal muscle, 1463–1467 Regulated secretory pathway (exocytosis), 800, 801F, 804 localization, 804, 804F plasma membrane enlargement, 805, 806F see also Exocytosis Regulation by multisite modifications, 186–187, 187F Regulatory cascades, 170, 482–483, 482F Regulatory DNA, 7–8, 206 eve gene modular organization, 1340F patterning of Drosophila embryo, 1332 programming of development and, 1309, 1309F as speciality of eucaryotes, 31–32 Regulatory myosin light chain (RMLC), Rhomediated phosphorylation, 1095 Regulatory T cell(s), 1543–1544, 1569–1570,

Q Q-cycle, 835–836 Quantitative reverse transcriptase polymerase chain reaction (RT-PCR), 573–574, 573F Quantum dots, 587, 588F Quaternary structure, 136 Quinone(s), 832F, 835, 851, 852F

R Rab5, 762, 762F Rab effector(s), 761, 761F Rab GTPase(s), 760–761, 761, 761T Rabies virus, 1496F, 1517, 1518 1505 Racreceptor, GTPase(s), 931 activation, microtubules role, 1043 effect on ac tin organization, 1042F, 1046–1047 epithelial apico-basal polarity, 1155F, 1155F, 1156 growth cone steering, 1387 Rad51 protein, 307F see also RecA protein Rad52 protein, 308, 308F Radiation, DNA effects, 300–301 see also Ultraviolet (UV) radiation Radiofrequency, NMR, 529 Radioisotopes, 600–601, 601T applications, 534, 602, 602–603, 602F, 603F see also Autoradiography measurement, 601 Radiolabeling, 534, 602–603, 603F Radixin, 1009 Raf kinase (MAP-kinase-kinase-kinase), 929, 929F, 1239 RAG protein, 1563, 1564, 1564F, 1600 Ramachandran plot, peptide bond angles, 127F Random mutagenesis, gene expression analysis, 553, 556 Ran-GAP, 708 Ran-GEF, 708 Ran-GTP, 711 Ran GTPase(s) compartmentalization, 709F mitotic spindle formation, 1081 nuclear transport, 708–709, 709F, 710F Ran-GTPase-activating protein (Ran-GAP), 708 Ran-guanine exchange factor (Ran-GEF), 708 Ras gene, 1107, 1233–1234, 1241, 1242, 1242F Ras GTPase(s), 179, 180F, 926–927, 936F activation of MAP-kinase pathway, 929F activation of PI 3-kinase, 934 active and inactive forms, 181F mitogen activation, 1103 mutated in cancers, 1107, 1233–1234 , 1241 normal Ras proteins, 1234 as oncogene, 1107 regulation, GEFs, 927, 928F structure, 180F Ras guanine nucleotide exchange factor (Ras GEF), 927, 928F Ras–MAP-kinase signaling pathway, 928–930, 929F, 1103, 1176 Rb (retinoblastoma) gene/protein cancer, 1104–1105, 1234, 1235 cell cycle control, 1103–1105, 1104F, 1244F knock-out in mice, 1242

repair), 303 see Homologous general (homologous) recombination (crossing-over) genetic engineering see Recombinant DNA technology meiotic see Homologous recombination (crossing-over); Meiosis


Release factors (transl ational), 381, 381F, 382F Remodeling, of synaptic connections, 1393 Reoviruses, host defences, 1535 “Repair factories,” factories,” homologous recombination, 310, 310F Repeat-induced recombination, prevention, 315F Repetitive DNA centromeric sequences, 210–211 genetic markers, VNTRs, 547F human genome, 207F, 323F multiplication in genome, 323F repeat-induced recombination, 315F RNA pol II CTD, 346 short tandem repeats, hypervariable microsatellites, 547F telomeric sequences, 210, 292 see alsoTransposon(s); alsoTransposon(s); specific types Replication errors, 269, 271–272, 276–277 see also Mismatch repair Replication fork, 266, 267–268, 269F arrangement, 276F asymmetry, 266, 268 bacterial, 266, 276–277, 282 cooperativity, 275–276 DNA microarray analysis, 285, 286F eucaryotic, 280, 1067 chromatin assembly factors (CAFs), 290 DNA damage response, 1105 experimental analysis, 284F histone association, 290 mammalian, 281F, 283–284 movement rate, 284 nucleosome assembly, 289–290 nucleosome interaction, 280 initiation, 282, 282F see also Replication origin(s) lagging strand s ynthesis, 267–268, 269F, 272, 272F, 276F, 281F leading strand synthesis, 268, 269F, 276F, 281F strand separation, 273 see also DNA helicase(s); DNA topoisomerases structure, 268, 269F template strand, 200, 200F 200F,, 201F, 266, 266F see also DNA replication Replication origin(s), 282F, 1067 bacterial, 282, 283FF hemimethylation, 282, 284F chromosomal, 209, 210F DNA sequences, 210, 281, 286, 287F, 288 DNA synthesis, 281–282

regulation by phosphorylation, 1104 ways of losing, 1236F

promiscuous, 315–316 site-specific see Site-specific recombination

eucaryotic, 283, 285F human, 288


origin recognition complex (ORC), 287, 288F replication units, 283–284 S. cerevisiae, 286, 287F, 288F licensing, 1067 prereplication complex (pre-RC) binding, 1067 Replication units, eucaryotic replication origins, 283–284 Replicative cell senescence, 293, 505, 1059, 1107, 1217 Reporter gene(s) gene expression analysis, 572–573, 572F GFP see Green fluorescent protein (GFP) LacZ, 442F Repressor protein(s) discovery, 416 DNA-binding, 418T, 420F, 421F, 423F eucaryotic, 445, 445, 445–447, 447F, 447FF mechanisms, 433–434, 434F 434F,, 436F, 445, 446F procaryotic Cro repressor see Cro repressor lac repressor see Lac repressor lambda repressor see Lambda repressor Met repressor, 423F operator binding, 434–434, 434F seeTryptophan tryptophan repressor see Tryptophan repressor translational repressors, 488, 490F Reproductive cloning, 507, 507F 507F,, 1302–1303, 1303F Dolly the sheep, 1287 Reproductive hormones, effect on cancer incidence, 1229 see also speci specific fic hormones Rescue, in dynamic in stability, 980, 981F, 981F, 1080 Respiration evolutionary aspects, 874–875 oxidation of organic molecules, 70 relation to photosynthesis, 70, 70F Respiratory burst, phagocytosis, 1532 Respiratory chain see Electron transport chain(s) Respiratory control, 837–838 Respiratory enzyme complexes, 819–820, 831–839 cytochrome b-c1 complex, 832, 833F, 835–836, 836F cytochrome oxidase complex, 832–834, 833F, 834, 834F energetics, 819, 819F, 835, 835F see also Proton pumps identification, 831–832 localization, 831–832, 833F see also Mitochondrial structure NADH dehydrogenase complex, 832, 833F, 836 Respiratory epithelium, 1435, 1435F colonization, 1502, 1503 function, 1502 mucus, as host defense mechanism, 1502, 1525 Restriction enzymes biological function, 532–533 recombinant DNA technology, 532, 532–533, 534F, 540–541 sequence specificity, 533 Restriction–modification systems, 532 Restriction (start) point of cell cycle, 1055, 1061, 1066, 1105 Retina gap junctions, 1162, 1162F histology and cell renewal, 1432–1433 neuronal specificity and retinotectal map, 1392–1393, 1393F structure, 1432–1433, 1432F Retinal, 166, 166F, 640, 1432 Retinal ganglion cells, 1391, 1432 Retinoblastoma, 1104, 1234–1235, 1235F seee Rb Retinoblastoma gene/protein se (retinoblastoma) gene/protein Retinoic acid, 889F, 890, 1285 Retinoic acid receptor, 891F Retinotectal map, refinement, 1393–1395, 1394F Retinotectal projection, 1391, 1393F Retromers, 755–756, 756, 756F Retrotranslocation, misfolded proteins, 391, 739–740, 740F Retrotransposons, 318T, 323 see also Retroviral-like retrotransposons Retroviral-like retrotransposons, 317, 318T, 320, 322F human genome, 207F LTRs, 318T reverse transcriptase, 318T

Gag proteins, translational frameshifting, 383, 384F genome, 321F genome integration, 321F see alsoTransposition alsoTransposition HIV see HIV (human immunodeficiency virus) integrase see Integrase life cycle, 321F mutation rate, 1450 oncogenesis, 1232 Pol proteins, translational frameshifting, 383, 384F reverse transcriptase see Reverse transcriptases translational frameshifting, 383, 384F see also Retroviral-like retrotransposons Reverse electron flow, 838, 872, 873F Reverse genetics see Genetics,reverse Reverse transcriptases, 264F, 292 applications, cDNA cloning, 542, 543F retrotransposons, 318T structure, HIV, 321F see alsoTelomerase alsoTelomerase Reverse two-hybrid system, 524 Rev protein, HIV mRNA transport, 485–486, 485F, 486F Rev responsive element (RRE), 485, 485F, 486F RGD motif, integrin–fibronectin binding, 1193 R-gene product, 1522, 1523F RhoA GTPase(s), 1094–1095, 1095F, 1177 RhoCgene, RhoC gene, in metastasis, 1249 Rhodamine, 586–587 Rhodopsin, 918, 918F, 1432 binding to dynein, 1022 ER membrane integration, 735F retinal binding, 166, 166F RhoGEF, 1095 Rho GTPase(s) actin organization, 1041–1043, 1042F, 1043–1045

growth cone steering, 1387 monomeric, 931, 1042–1043 RhoA see RhoA GTPase(s) Rhombomeres, 1345 Ribbon protein models, 132F, 137F Ribonuclease, size, 1182F Ribonucleic acid see RNA (ribonucleic acid) Ribose, 112F, 116F, 332, 332F Ribosomal proteins, 373 bacterial, 378F, 379F ribosomal location, 378–379, 379F translational control, 488 Ribosomal RNA (rRNA), 6–7, 6–7, 373 bacterial, 378F, 379F eucaryotic, 360–361, 361F functions, 336T, 378 genes, 360–361, 361F, 363, 863, 1290 modifications, 361, 361F, 362F processing, 360–361, 361F, 362F see also SnoRNAs synthesis, 360–361 see also RNA polymerase I; RNA polymerase III transcription, 334F, 335–336, 340T Ribosome(s), 6–7, 8F, 374F assembly, 488 bacterial, 149–151 eucaryotic, 362–363, 364F, 374–375 see also Nucleolus bacterial, 149–151, 378F, 379F antibiotic binding, 384, 384F 384F,, 385T eucaryotic vs., 374F composition see Ribosomal proteins; Ribosomal RNA efficiency, 375 electron microscopy single-particle reconstruction, 612F eucaryotic, 360–361, 362–363, 374F free, 728, 729F hydrophobic interactions, 381 internal ribosome entry site (IRES), 491 leaky scanning, 490 membrane-bound, 728, 729F polyribosomes (polysomes) 373–376, see protein synthesis, 488Polyribosome(s) see also Protein synthesis; Translation ribozyme activity, 378–379 rough ER, 724–725 structure, 373, 374–375, 374F, 378–379, 378F, 379F


large subunit, 375 protein location, 378–379, 379F RNA location, 378, 378F small subunit, 375 Ribosome recycling factor, 381F Riboswitches, 478–479, 478F, 489F Ribozymes, 378–379, 404FF, 406F allostery, 406F conformational changes, 404, 406F protein catalysts vs., 404 ribosomes, 378–379 ribozyme-catalysed reactions, 405T RNA folding, 404, 404F synthetic, 404F, 408 see also Catalytic RNA Ribulose, 112F Ribulose bisphosphate carboxylase, 844, 844F, 846 Rickettsia prowazekii, genome size, 18T Rickettsia rickettsia, actin-based movement, 1515–1516 Rifamycin, 385T Rigor state, of myosin, 1019 RISC (RNA-induced silencing complex), 494, 494F RITS (RNA-induced transcriptional silencing complex), 496 River blindness, 1518 RNA (ribonucleic acid), 4–8, 62F biosynthesis, 85, 85F, 86, 87F cellular types, 336T mRNA see Messenger RNA noncoding, 360–361, 362F see also speci specific fic types composition, 335–336 degradation, 379F, 415, 485, 492–493, 495 double-stranded (dsRNA), 1535 editing see RNA editing evolutionary significance, 300, 408, 408F see also RNA world hypothesis genetic material, 300 information transfer, 331, 331F see alsoTranscription alsoTranscription localization, gene expression regulation, 379F, 415, 486–488 molecular conformation, 4–5, 5F, 7F processing see RNA processing (eucaryotic) recombinant DNA technology, 546, 548 in situ hybridization, 585, 586F splicing see Splicing structure see RNA structure synthesis, 335–336, 408 autoradiography, 602 error frequency, 270 polytene chromosome(s), 239F see alsoTranscription alsoTranscription RNA cleavage regulation, 439–441 RNA–DNA hybrids, 338, 536–537, 538F RNA editing, 483 evolutionary significance, 483–484 gene expression regulation, 483–485 mammalian mRNA, 484 rRNA processing, 361, 361F, 362F transfer RNA, 368F, 369, 369F trypanosome mitochondrial mRNA, 483, 484F see also Guide RNAs RNA endonuclease, 492, 492F “RNA factory” concept, RNA polymerase polymerase II, 346, 347F RNA-induced silencing complex (RISC), 494, 494F RNA-induced transcriptional silencing complex (RITS), 496 RNA interference (RNAi), 495–497, 571–572 Caenorhabditis elegans, 571, 571F chromatin remodeling, 443 Dicer protein, 496 Drosophila, 571 experimental applications, 497, 564F in human disease, 497 mechanism of action, 571 reverse genetics, 572 technique, 571–572 transposable element reduction, 496 tumor cell identification, 1240 viral dsRNA-directed ssRNA destruction, 1535 RNA-like polymers, origin of life, 402, 402F RNA polymerase(s), 334, 334F, 335F bacterial, 336–337, 337F, 438F RNA pol II vs., 339–340, 340F sigma factors, 336, 439, 439T

see also Retroviruses Retroviruses

binding-sites, 375–376, 375F catalytic site, 378–379

structure, 337F transcription cycle, 337F

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



transcription regulation, 438–439, 439T, 440 chromatin remodeling, 433 DNA polymerases vs., 334, 335 DNA repair coupling, 299–300 elongation factor association, 343–344 energetics, 337 eucaryotic, 339–340, 340T chromatin effects, 343, 343F, 344 functions, 339, 340T RNA polymerase I, 339, 340T RNA polymerase II, 339, 340T RNA polymerase III, 339, 340T transcription regulation, 440 see alsoTranscription alsoof, Transcription factors,general (TFII) evolution 335F fidelity, 270, 334–335 nucleoside triphosphate substrates, 334 orientation, 339, 339F promoter binding, 337 proofreading, 334–335 protein–DNA interaction, structural changes coupled to DNA-binding, 336–337, 338 reaction mechanism, 334 structure, 334F superhelical tension generation, 344–345, 345F see also indiv individual idual enzymes RNA polymerase I, 339, 340T, 360, 363 RNA polymerase II, 339, 340T general transcription factors, 340–342 see alsoTranscription alsoTranscription factors,general (TFII) processivity, 357–358 “RNA factory” concept, 346, 347F structure, 340F bacterial polymerase vs, 339–340, 340F C-terminal domain (CTD), 341, 346 transcription initiation, 341–342, 341F, 343F chromatin-modifying proteins, 343 transcriptional activators, 342–343, 343F, 440 transcriptional mediator, 343 transcription termination, 358 RNA polymerase III, 339, 340T, 361 RNA primers, DNA replication, 272, 272F RNA probe(s), 537 RNA processing (eucaryotic), 345–346 editing, 483–485 gene expression regulation, 379F, 415, 477–485 3¢ changes, 482–483 splicing, 477–481 see also Alternative splicing mRNA capping, 346 nuclear subdomains, 364–366 polyadenylation, 346 splicing see Splicing RNA–RNA rearrangements snRNPs, 351 splicing mechanism, 350–351, 350F, 351F AT–AC AT –AC spliceosome, 353–354 ATP hydrolysis, 351–352 RNA splicing see Splicing RNA structure, 272, 332–333, 332F, 333F base-pairing, 332, 333F, 403 DNA comparison, 408 double-stranded, RNA interference (RNAi), 495 folding, 332, 333F, 403–404, 403F, 404 noncovalent interactions, 64, 64F 64F,, 403 tRNAs, 368, 368F nucleotides, 62, 332 see also Nucleotide(s) phosphodiester backbone, 332F secondary, 403, 403F hairpins, 338, 403F Tar,, transcription attenuation role, 478 Tar tertiary, 403–404, 403F RNA transcripts see Messenger RNA RNA transport, 486–488 gene expression regulation, 379F 379F,, 415, 485–486, 486–488

mechanisms, 486–487, 487F 3¢ UTR, 487–488, 488F nuclear see Nuclear–cytoplasmic transport regulation, RNA virus(es) 710 assembly, 149–151 defense, RNAi, 495 double-stranded RNA (dsRNA), 1534, 1535–1536 genomes, 1497F mutation rate, 1520–1521

limited genetic code?, 407 natural selection, 404–406 self-replicating system, 401, 402F transition from pre-RNA world, 402–403 see also Catalytic RNA; Ribozymes Rock kinase, 1095 Rod photoreceptors (rods), 1432, 1433F amplification of signal in visual transduction cascade, 919–920, 920F outer segment, renewal, 1433, 1433F renewal, 1433F response to light, 918F Root(s)

1056F Schwann cell(s), myelin production, 678 Scintillation counter, 601 Scrapie, 397–398, 1498 Scribble complex, epithelial apico-basal polarity, 1156, 1157F Scurvy, 1186 Scute gene, 1356 S-cyclins, 1062, 1064, 1087 SDS (sodium dodecyl sulfate), 517, 517F membrane protein solubility, 637 SDS-PAGE, 517, 518F, 637 see also Polyacrylamide gel electrophoresis

apical meristem, 1163, 1400, 1401F1400F in plant development, structure, 1404–1405F tip, 1407F Root cap, 1407F Root hairs, 1405F 1405F,, 1407F Rosettes, cellulose synthase, 1199, 1201 Rotational diffusion, membrane proteins, 642 Rotaviruses, 1496F Rough endoplasmic reticulum see Endoplasmic reticulum (ER), rough Roundabout receptor protein, 1388F, 1389 Rous sarcoma virus, 1232, 1233F 1233F,, 1499 rRNA see Ribosomal RNA RTK (receptor tyrosine kinase) see Receptor tyrosine kinases (RTK) Rubisco see Ribulose bisphosphate carboxylase Ruffling, at leading edge of cells, 1040F RuvA, Holliday junctions, 312F RuvB, Holliday junctions, 312F

S1 fragment, myosin, 1012 S6 kinase (S6K), 1108 Saccharomyces cerevisiae actin, interactions with other proteins, 983, 983F cell cycle, 1056–1057, 1056F cell polarization, 1044 centromere structure, 229, 229F DNA replication, 286–287, 287F genome, 286–287, 287F, 552 His gene gene,, 285F as model genetic organism, 286–287, 864 mutants, 287 protein interaction maps, 188, 190F role of cytoskeleton, cellular polarity, 969–970 “shmoo,” 1044, 1044F Saccharomyces pombe, genome, sequencing, 552 Salivary gland, Drosophila polyteny, 236–238, 237F, 237FF Salmonella enterica, 1491 invasion of host cells, 1508, 1509F pathogenicity islands, 1491F phagocytosis, 1533 spread, 1518 strategy against host membrane traffic, 1511F, 1512, 1512F Salmonella, phase variation, 454–455, 455F Saltatory conduction, action potential propagation, 680 SAM complex, 715 Sar1 protein, coated-vesicle formation, 759, 759F Sarcoma(s), 1206, 1232 Sarcomere, 1026, 1028, 1028F Sarcoplasmic reticulum, 660, 725–726, 1029 Satellite cells, skeletal muscle, 1466 Satellite tobacco necrosis virus, virus, capsid, 149F Scaffold protein(s), 894, 897, 930, 931F, 1145, 1148F PDZ domains, 1148 synapse formation and, 1148–1149, 1149F tight junction(s), 1153–1155 unstructured polypeptide chains, 147 Scale, 580, 580F Scanning electron microscopy (SEM), 607–608, 608F, 609F S-Cdk, 1066, 1067–1069, 1068

(PAGE) Sealing strands, tight junc tion(s), 1152, 1152F, 1153F Sea urchin, gastrulation, 1307F Sebaceous gland, 1418F Secondary antibody response, 1546F Secondary cell walls, 1195, 1196 Secondary cultures, 504 Secondary immune response, 1546 see also Immune response/system,adaptive Secondary lymphoid organ see Peripheral lymphoid organ Secondary oocytes, 1289, 1289F Second messenger(s), 893 see also Cyclic AMP (cAMP) g-Secretase, -Secretase, 947 Secretory component, 1556F Secretory C-terminal, 482–483 Secretory granule(s) see Secretory vesicle(s) Secretory protein(s), exocytosis, 800 Secretory vesicle(s), 800 egg (ovum), 1288 exocytosis, 802F formation, 801–802, 801F membrane fusion, 803 membrane recycling, 805 proteolytic processing of cargo, 803, 803F sperm, 1293 synapses see Synaptic vesicle(s) Sectioning, microscopy sample preparation, 585, 585F, 605 Securin, destruction by APC/C, 1064, 1066, 1087 Sedimentation coefficient, 511, 522 Seed(s), 1402, 1404F Seedlings, 1403 Arabidopsis mutants, 1403F Segmentation genes controlling, 1336–1338, 1337F, 1338F Drosophila Drosop hila see Drosop Drosophila hila melanogaster melanogaster segmentation genes see also speci specific fic genes insect body, 1329, 1330F see also Drosop Drosophila hila development vertebrates, 1345, 1346F 1346F,, 1371–1372, 1372F Segmentation clock, 1372–1373 Segmentation, Drosophila, 1329 Segment-polarity genes, 1333, 1338F, 1339 Segment shuffling, DNA, 19, 19F Selectin(s), 1145–1146, 1177T functions, 1145, 1146F L-selectin, 1145, 1550, 1550F structure, 1145–1146, 1146F Selective pressure, Antibiotic resistance, 1523 Selectivity filter(s), ion channels, 668, 672 Selenocysteine, translational recoding, 383, 383F Self-assembly, lipid bilayers, 9, 10F “Selfish DNA,” DNA,” definition, 317 Self-replicating molecules, evolution autocatalysis requirement, 401 catalytic RNA, 404, 407F natural selection, 404–406 polynucleotides, 401 polypeptides, 401 Self-splicing RNA, 356–357, 356F see also Catalytic RNA SEM see Scanning electron microscopy Semaphorin protein, 1388F 1388F,, 1389 Semiconservative DNA replication, 266, 266F

S. cerevisiae seefactor), Saccharomyce Sacchar omycess cerev cerevisiae isiae SCF (stem-cell 1375 SCF enzyme complex, 184–185, 185F, 1064, 1065F, 1066T protein interaction maps, 188, 190F Schistosoma haematobium, bladder cancer causation, 1228

Seminiferous 1293 Semliki forest tubules, virus, 1507 virus, Senescence see Cell senescence Sensory bristles, 1356, 1356F Sensory cells, as transducers, 1429 see also specif specific ic types Sensory epithelia, 1429, 1429–1433


structures, 1496F RNA world hypothesis, 300, 400–404, 402F, 408F

Schistosomes, eosinophil attack, 1532, 1532F Schizosaccharomyces pombe, 24F, 1056–1057,

Sensory mother cell, 1356–1357, 1356FF Sensory neuron(s), 1386F, 1390



Sepallata, ta, Arab Arabidops idopsis is mutant, 1414 Sepalla Separase, 1087, 1278 Sepsis, 1534 Septate junctions, 1154–1155, 1154F Septic shock, 1534 Septins, 1097 Sequence tags, genetic engineering, 570 Sequential induction, 1319–1320 see also Drosop Drosophila hila development Serine protease(s) active site, 154, 155F extracellular matrix degradation, 1194 protein family evolution, 138–139, 140–141,

Signaling cascades, 895 Signaling cell(s), 880 Signaling molecule(s)/pathway(s) BH3-only proteins, 1123 cancer role, 1242–1245, 1243F caspases, 1119 cell adhesion and, 1136–1137 , 1145, 1172 developmental, 1316, 1316T C. elegans, 1325–1326 inhibitors, 1317–1318 mechanisms of signal spread, 1318–1319, 1318F morphogens, 1316–1317, 1317F, 1318F

applications, 325–326 consequences gene control, 325–326 genome rearrangement, 324, 324F, 455, 455F mutations, 565, 565F mechanisms conservative, 324, 324F, 325–326 seeTransposition transpositional see Transposition see also Integrase; Transposase Skeletal muscle, 1463–1467 actin filaments, 1003, 1012 see also Actin/actin filaments; Myosin(s) cells, 1463

140F structural homologies, 137–138, 138F Serine, structure, 129F Serine/threonine kinases, 941 cell signaling, 939, 940F plants, 956–959 receptor-linked, 177F regulation, 177 see also also individual kinases Serine/threonine phosphatases, 938 Serotonin (5-hydroxytryptamine, 5-HT), 904 endocrine cells of respiratory epithelium, 1435 neurotransmitter role, 684 Sertoli cells, development, 1284–1285, 1286F Sevenless mutant, Drosophila Drosophila,, 927 Drosophila,, 927 Sev protein, Drosophila Sex chromosome(s), 202, 473, 554F meiotic pairing, 1275 sex determination and, 1271, 1284F see also X-chromosome; Y-chromosome Sex determination, 1282–1286 Drosophila melanogaster, 481–482, 481F, 482F gonad development, 1283, 1283–1285, 1283F, 1286F variation between species, 1286 see also Primordial germ cells (PGCs) Sex differences, meiosis regulation, 1280–1281 Sex hormone, 890 Sex-lethal Sex-let hal (Sxl) gene, Drosophila sex determination, 481F, 482F Sex-reversed mice, 1284 Sexual reproduction, 1269–1304 evolutionary perspective competitive advantage, 1271–1272, 1271F genetic diversity, 1271, 1279–1280, 1279F fertilization see Fertilization gamete production, 1090, 1269, 1272–1274 see also Egg (ovum); Meiosis; Spermatozoa germ cell development see Primordial germ cells (PGCs) haploid vs. diploid cells, 1269–1271, 1270F horizontal gene transfer, 22 overview, 1269–1272 sex determination see Sex determination species differences, 1285–1286 strategy differences, 1282 SH2 domain (Src homology 2 domain) cell signaling proteins, 898, 899F, 924–926, 925F, 936 Src family, 178, 178F STATs, 937–938, 938F evolutionary tracing, 155, 155F protein phosphorylation, 175 regulatory role, 178, 178F structure, 131, 132–133FF 132–133FF,, 136F, 141, 144F surface–string interactions, 156, 156F SH3 domain (Src homology 3 domain), 898, 899F, 925, 936 regulatory role, 178, 178F structure, 136F, 141 Shigella flexneri, 1491 actin-based movement, 1516, 1516F antibiotic-resistant, 1524 virulence plasmid, 1491F Shine–Dalgarno sequence, 380, 488, 489F “Shmoo,” of yeast, 1044, 1044F Shoot apical meristem, 1163, 1401F, 1408FF, 1409–1410, 1411F

see also Development; Morphogenic gradient(s) DISC, 1120 extracellular see Extracellular signal molecule(s)/pathway(s) intracellular see Intracellular signal molecule(s)/pathway(s) kinases as input–output devices, 177F proteoglycans, 1183 signaling proteins, 627F 627F,, 630–631 signal transduction see Signal transduction turnover rate of signaling molecules, 886–887, 887F see also specif specific ic pathw pathways/c ays/componen omponents; ts; specif specific ic types/pathways Signaling networks, “microchip”analogy, 177–178, 177F Signal patch(es), 701–702, 701F M6P addition recognition, 785 nuclear localization signals, 705–707 Signal-recognition particle(s) (SRP) protein transport, 727–730, 728, 730 structure, 728, 728F Signal-relaying junction(s), 1132, 1132F, 1133T see also specif specific ic types Signal sequence(s), 701–702, 701F, 703F chloroplast proteins, 719–720 mitochondrial proteins, 713, 714F nuclear localization signals, 705 peroxisomes protein import, 722 rough endoplasmic reticulum protein import, 726–727 types, 702T Signal transducers, 641, 891 Signal transduction adaptation (desensitization), 902, 920, 920F cyclic AMP, 905–909 G proteins see G protein(s) (trimeric GTP-binding proteins/ATPases) NFkB, B, Toll-like receptors, 1530 nuclear receptor superfamily, 889–891, 889F, 891F photoreceptors, plant photoproteins, 960–961, 961F Silent mutation(s), 264 Simian immunodeficiency virus (SIV), diversification and origin, 1521F Simian virus 40 (SV40), (SV40), capsid, 149F SINEs (short interspersed nuclear elements), 207F, 322 Single-cell expression analysis, 575–576, 576F Single-nucleotide polymorphisms (SNPs), 560 genome evolution, 259 inheritance tracking, 562F see also Haplotype blocks physical gene mapping, 560, 560F seeTransmembrane Single-pass proteins see Transmembrane protein(s) Single-strand DNA-binding proteins (SSBs) cooperativity, 273, 274F DNA hybridization role, 306 DNA replication machiner y, 273, 274F, 274F, 276F eucaryotic, 280 structure, 275F Single-strand DNA breaks (nicks), 277, 277F, 278, 279F see also Strand-directed mismatch repair Single-strand DNA, effect of SSBs, 273, 274F Sister chromatid(s), 243FF, 1054

cell size, 1026, 1026F 1026F, , 1463 differentiation, 464, 464F satellite cells, 1466 see also Muscle fiber(s) genesis, 1463–1467 modulation, 1463–1467 regeneration, 1463–1467 structure, 1012F, 1026, 1027F, 1029, 1029F Skin architecture, 1418, 1418F cancer, 295T, 1226 function, 1417 Mammalian, 1418F replicative senescence, telomeric repeats, 293 supportive functional requirements, 1417–1418 Sliding clamp, 274, 275F, 281F Slit protein, 1388F, 1389 SL RNP, 353–354, 354F Slug gene/protein, epithelial–mesenchymal transitions, 1141 Smad4 gene, colorectal cancer, 1255 Smad-dependent signaling pathway, 940F Smad family, 939–940, 941 Small-cell lung cancer, associated mutations, 1256 Small interfering RNA (siRNA), 336 Small intestine, histology, 1436–1442, 1436F Small-molecule inhibitors, 527, 527F Small molecules organic see Organic molecules (small, cellular) transmembrane transport, 651 universality, 8–9 Small nuclear ribonucloproteins see SnRNPs Small nuclear RNAs see SnRNAs Small nucleolar RNAs see SnoRNAs Smallpox virus, 1496 SMC proteins, 243, 244F, 1070 SMN (survival of motor neurons) protein, 364–365 Smooth endoplasmic reticulum see Endoplasmic reticulum (ER),smooth Smoothened protein, 951 Smooth muscle calcium influx, 1030 cells, 1463–1464, 1463F blood vessels, 888, 1450 mechanism of action, 1030 Snailgene/protein, Snail gene/protein, epithelial–mesenchymal transitions, 1141 SNARE proteins disassembly, 764, 764F membrane fusion, 762–764, 763F, 768, 769F Rab effector interaction, 761 target membrane SNAREs, 762–763, 763FF tetanus toxin target, 760 vesicle SNAREs, 762–763, 763F vesicular transport guidance, 760 SnoRNAs, 361 function, 336T, 362F nuclear localization, 365F transcription, 340T snRNAs, 349–350 catalytic functions, 351 function, 336T see also Splicing nuclear localization, 364, 365F protein complexes (snRNPs) see SnRNPs SL snRNA, 354F transcription, 336, 340T U1 snRNA, 349, 351, 352

“Shotgun”g cloning, 542, 551 Shugoshins,ene 1278 Sialic acid (NANA), 628F, 774F, 774F, 775F Sic1 protein, 1101 Sickle-cell anemia, 1495 Sidekicks proteins, synapse formation, 1147 Sigma factors, 336, 337F, 439, 439T

meiotic, 1273243FF mitotic, 243, cohesion, 1054, 1070–1071, 1070F resolution, 1075 separation, 1075, 1087, 1087F, 1088, 1088F, 1089–1090, 1089F spindle attachment, 1083–1085, 1084F

U2 U4 snRNA, snRNA, 349, 349 352 U5 snRNA, 349, 352 U6 snRNA, 349, 351, 352, 363 see also Spliceosome snRNPs, 349–350 assembly, 365F

Signal hypothesis, protein transport, 726–727, 727F, 728F

Site-directed mutagenesis, 565, 565F Site-specific recombination

AT–AC spliceosomal, 354–355, 354F AT–AC recycling, 364

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



RNA–RNA rearrangement, 351–352 SL RNP, 353–354, 354F sm proteins, 365F splicing mechanism, 350F 350F,, 352 U1snRNP, 350F, 351, 351F U2 snRNP, 350F, 351F U4/5/6 triple snRNP snRNP,, 350F U4 snRNP, 350F U5 snRNP, 350F, 351F U6 snRNP, 350F, 351F assembly, 363 see also SnRNAs; Splicing Sodium-calcium exchanger, 660

motility, 1293, 1293F plasma membrane domains, 645, 646F precursors see Spermatocytes production see Spermatogenesis structure, 1292–1293, 1293F Spermatozoon see Spermatozoa under Cell cycle S phase of cell cycle see underCell Sphingolipid(s), membrane lipid(s), 618–620, 625 see also speci specific fic types Sphingomyelin, 618, 619F, 744–745 Sphingosine, 618, 619F, 628, 744–745 Spinal cord development, 1385–1386, 1386F

Staining, histochemical, 554–555, 579, 585F Staphylococcal nuclease, reaction rates, 161F Staphylococcus, infection route, 1501 Starch biosynthesis, 846 granules amyloplasts, 841, 841F chloroplasts, 94F, 95, 841, 842F structure, 94F synthesis, 95 Start (restriction) point of cell cycle, 1055, 1061, 1066, 1105 Start-transfer signal(s), ER protein transport, 732

see VoltageSodium channel(s), gated voltage-gated sodium channel(s) Sodium dodecyl sulfate see SDS (sodium dodecyl sulfate) Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), 517, 518F, 637 Sodium independent chloride–hydrogen carbonate exchanger, 658 Sodium-linked symporter, 659 Sodium–potassium pump (ATP (ATPase), ase), 661–663, 662F osmotic regulation, 669 pumping cycle, 662F selectivity, 671 So (sine oculis oculis)) gene, 466F Sog gene, 1335 Solvent(s), water, 109F Somatic cell(s), 1271 functions, 265F heat-shock induced recombination, 1348 induced recombination, 1348, 1349F mutations, 265, 1208, 1209 Somatic hypermutation, antibodies, 1566–1567, 1567F Somatic mutation(s), 265, 1208, 1209 see also Cancer; Mutation(s) Somatic nuclear transplantation, 507–508, 507F Somatosensory region, cerebral cortex, 1392F Somatostatin, 908 Somite(s), 1371, 1372F Sonic Hedgehog protein, 950 Son-of-sevenless mutant, Drosophila Drosophila,, 928 SOS response, 310–311 see also DNA repair Southern blotting, 539–540, 539F Sox9 gene/protein, testes development, 1285 Sp1 protein, DNA sequence recognition, 418T Space-filling models, 50 lysozyme, 164F protein molecules, 144F SH2 protein domain, 133F Species differences chromosomes, 204–205, 205F sex determination, 1286 sexual reproduction, 1282, 1285–1286 Xenopus laevis, 38–39 Species divergence, mutation rates, 264 Specificity pocket, MHC protein, 1577–1578, 1579F Spectrin actin cross-linking, 1007F actin filament packing, 994F actin filament web formation, 1008 membrane cytoskeleton, 646, 647F structure, 1008 Spectroscopy, electron carriers, 831, 832F Sperm see Spermatozoa Spermatids, 1293, 1294 Spermatocytes, 1293 meiosis in, 1281 primary, 1293 secondary, 1293, 1294 Spermatogenesis genes regulating, 1295–1296 spermatids, 1293, 1294 spermatocytes see Spermatocytes spermatogonia, 1293 stages, 1293–1294, 1294F, 1295F syncytia, 1294–1296, 1296F

tissue culture,atrophy, 504 Spinal muscular inherited, SMN protein mutation, 364–365 Spindle assembly checkpoint, 1088 Spindle pole body, 993 Spirochaetes, structure, 1490F Spiroplasma, 14F Spisula development, cell cycle analysis, 1058 Spliceosome(s), 349–351, 349–351, 354F active site, 352 assembly, 350 AT–AC AT –AC spliceosome, 353–354, 354F ATP hydrolysis, 351–352 catalytic RNAs, 352 components, 350F, 352 see also SnRNAs evolution, 355–357 fidelity mechanisms, 352 mode of action, 350–351, 350F RNA–RNA rearrangements, 351–352, 351F, 353 SR proteins, 352, 353 trans-spliceosome, trans -spliceosome, 354–355, 354F Splice sites, 350F Splicing, 346, 347–348 alternative see Alternative splicing AT–AC AT –AC splicing, 353–354, 354F cellular location, 366 errors, 347–348, 352, 352F 352F,, 355, 355F evolution, 355–357 evolutionary advantage, 348 gene expression regulation, 477–481 Drosophila sex determination, 481–482, 481F, 482F intron removal, 347–348 mechanisms, 347–348, 350F, 354F base-pairing, 351 lariat structure, 347, 348F, 350F machinery see Spliceosome(s) release, 352 RNA–RNA rearrangements, 350–351, 351–352, 351F self-splicing see Self-splicing RNA transesterification, 347, 348F muscle cell isoforms, 1465 plasticity, 355, 480 regulation, 480, 480F signals, 349, 349F splice sites, 350F, 352–353, 353F trans-splicing, trans -splicing, 354–355, 354F tRNA, 369, 369F Splicing signals, 349, 349F, 352, 352F, 355, 355F Spo11 meiosis-specific protein, 1280 S. pombe, 552 Spore(s), 1269 SPR see Surface plasmon resonance (SPR) Squames, 1419, 1419F Squid giant axon, classical experiments, 678, 679, 679F Squint, 1396 Src family of protein tyrosine kinases, 936 deletions leading to cancer, 1232 evolution, 177F membranes, 631 regulation, 178, 178F Src see Src protein structure, 178F Src homology 2 domain (SH2) see SH2 domain Src homology 3 domain (SH3) see SH3 domain

mechanism, 733Frelease, 463 Starvation, cortisol Stathmin, 995F, 1000 Stearic acid, 114F Steel factor (SCF; stem-cell factor), 1375 Stem cell(s), 1417–1484 asymmetry of daughter-cell fates, 1421, 1421F division rate, 1420, 1425 embryonic (ES) see Embryonic stem (ES) cells engineering, 1476–1483 epidermal, 1417–1428 founder cell population, 1424F gut epithelium, 1436–1437 hemopoietic see Hemopoietic stem cells immortal strand hypothesis, 1424–1426, 1425F multipotent, hemopoietic, 1450–1463 production, 1421–1422, 1421F, 1424 role in cancer, 1217–1218, 1219 Stem cell factor (SCF), 1375 Stem cell niche, signaling pathways, 1441, 1442F Stem-loops, RNA structure, 403F Stereocilia, 1430, 1430F, 1431F Stereo vision, 1396 Steric limitations, peptide bonds, 127F Steriocillia, 609F Steroids, structure, 115F Sterol(s), membrane lipid(s), 618–620 STI-751 (Gleevec), chronic myelogenous leukemia therapy, 1261 Stimulatory G protein (G S), 906–907, 919T Stomach bacterial colonization, 1503 pylori association, 1228, cancer, Helicobacter pyloriassociation, 1229, 1503 epithelium, 1436 ulcers, 1228, 1503 Stomata, 846 Stop codons, 367F, 381 Strand-directed mismatch repair, 272, 276–278, 277F Strand invasion, homologous recombination, 305, 306 Stratified squamous epithelium, 1434 Streptococcus, 14F, 1501 Streptomycin, 385T Stress, cortisol release, 463 Stress fibers, 1093 Stroma, 1165 cells, hemopoiesis control, 1458–1459, 1458F chloroplasts, 713F, 719–720, 842, 843F, 853 mammary gland, 1428 protein transport, 719–720, 720F role in tumor progression, 1222 Strychnine, mode of action, 684 Subcutaneous layer (hypodermis) of skin, 1418, 1418F Substrate(s), enzyme binding, 72–73, 159–160 see also Ligand(s) Subunits (macromolecules), 148–152 Succinate, 122F, 123F Succinyl CoA, 122F, 123F Succinyl-CoA synthetase, 123F Sucrose, 511, 846 Sugars, 55–58, 112–113FF biosynthesis via photosynthesis, 69, 70F, 845–846, 845F see also Photosynthesis as building blocks, 56

Spermatogonia, 1293 1292–1296 Spermatozoa, adaptation for DNA delivery, 1292–1293 binding to eg g, 1270F, 1298–1299, 1298F acrosome reaction, 1297, 1298, 1299F cortical reaction and, 1299, 1300F see also Fertilization

Src-like kinase, B-cell signaling, 1596F Src protein functional role, 178, 179F regulation, 178, 178F structure, 136, 136F, 178F SRP see Signal-recognition particle(s) (SRP) SR proteins, 352, 353

derivatives, 113F 55–58, 88F, 96–97, 824T energy source, polymerization, 56 storage, 94F see also Starch structure, 55–56, 57F, 112F, 113F see also Carbohydrates; Monosaccharides;

capacitation, 1294, 1297 mitochondria, 816F

Sry gene/protein, 1283–1285, 1285, 1286F Srygene/protein, S–S bonds see Disulfide bonds

Polysaccharides; individual sugars Sulfolobus, tree of life, 16F



Supercoiling, 344–345, 344F Superhelical tension, 344–345, 344F Superoxide, aging, 868 Superoxide dismutase (SOD), 860, 868 Superoxide radical, 833 Supporting cells, olfactory epithelium, 1429, 1429F Suppression, self-reactive lymphocytes, 1548 see also Immunological tolerance Suppressor mutation(s), 528F Suprachiasmatic nucleus (SCN), circadian clock, 461 Surface plasmon resonance (SPR), 525–526, 525F Surfactant, 1434, 1435F Surrogate light chains, pre-B cell, 1553, 1565–1566,

TATA TA TA box consensus sequence, 342F location, 340 transcription factor-binding, 340–341, 341F, 342F Tat protein, transcription attenuation, 478 Tau protein, 995F, 995F, 1001, 1002F Tautomeric shift, DNA bases, 269, 270 Taxol, 988, 988F, 988F, 988T seeTA TBP see TATA-binding TA-binding protein (TBP) TC see Cytotoxic T-cells T-cells ( TC) TCA cycle see Citric acid cycle T-cadherin, 1136–1137, 1138T T cell(s), 1392–1409, 1540, 1569–1589

see also DNA replication; Transcription Teosinte, 1411, 1411, 1411F Teosinte branched-1 (Tb1) gene, 1411 Terminal differentiation, 1103, 1420 Terminator elements, transcription, 337, 338, 339 Testes development, 1283–1285, 1286F spermatogenesis, 1293–1294, 1294F, 1295F structure, 1293, 1294F Testosterone, Testoster one, 889F Tetracyclin, 318F, 318F, 385T Tetradecanoylphorbol acetate, acetate, as tumor promoter, 1226

1566F Survival factor(s), 1102, 1126, 1127F Suspensor, 1400, 1400F, 1401F Swinholide, 988T Switch helix, GTP-binding proteins, 181 Switch sequences, class switching, 1568 Syk kinase, B-cell signaling, 1596F Symbiosis chloroplast origins, 29 mitochondrial origins, 27–28 Sympathetic ganglion, 1390F Sympathetic neurons, NGF dependence, 1390 Symporter(s), 656, 656F, 659 Synapse(s), 682 chemical see Chemical synapse(s) electrical, 1161 elimination, 1393–1395, 1394F formation, 1149F, 1393–1394 cell adhesion molecules and, 1147–1148 scaffold proteins and, 1148–1149, 1148F immunological, signal-relaying junctions, 1132 modification, dependence on electrical activity, 1395F organization/structure, 1149F regeneration, 1168–1169, 1168F remodeling, 1393, 1396–1397 signaling, 882, 882, 882F synaptic cleft, 682 vesicles see Synaptic vesicle(s) Synapsis, 305F, 306F, 1275, 1276F Synaptic cleft(s), definition, 682 Synaptic connections, remodeling, 1393, 1396–1397 Synaptic signaling, 882, 882F Synaptic vesicle(s), 807–808 membrane fusion, 803 structure, 809F see also Neurotransmitter(s) Synaptobrevin, v-SNARE, 763F Synaptonemal complex, 1274F 1274F,, 1275–1276, 1275F Synchronized cells, 285 Synchrony, of electrical activity in synapse modification, 1393–1395 Synchrotron X-ray sources, 529 Syncytia, 1099 Drosophila embryo, 448F, 1330 muscle cells, 1464 Syndecan-1, 1184T Syndecans, 1183–1184 Synechocystis, genome size, 18T Synonymous mutation, 247 Syntaxin, t-SNARE, 763F Synteny blocks, genome evolution, 250 conserved, 207, 250 human–mouse, 208F Synthetic biology, 460, 461F Synthetic lethality, 559 Synthetic phenotype, 559

T4 bacteriophage, 22F T7 polymerase, proofreading, 269 Tagged knockouts, functional genomics, 569–571 Tail polymerization, 86, 87F Tail region see Fc region,antibody molecule Talin, 1170, 1170F

accessory 1580–1581 1571–1572, 1572T, activation, receptors, 711F, 1543F, 1590F, 1591–1592, 1591F antigen recognition, 1575 CD4 see Helper T-cell(s) (TH) cytoskeletal polarization in, 1047, 1573 development, 1543F direction to targets, 1579–1580 general properties, 1540–1551 helper see Helper T-cell(s) (TH) integrins, 1174, 1174F lymph node, 1551F main classes, 1543 MHC class restriction, 1579–1580 MHC protein interaction, 1569–1589, 1575 recirculation, 1549–1551, 1550 resting, 1544F selection in thymus, 1585–1586, 1585–1586, 1587F tolerance, nonactivated dendritic cells, 1571 see also CD4 T-cell(s); CD8 T-cell(s); Cytotoxic T-cells (T C); Regulatory T cell(s); T cell receptor(s) T cell co-receptors CD4, 1580–1581, 1580T, 1581F see also Helper T-cell(s) (TH) CD8, 1580–1581, 1580T, 1581F see also Cytotoxic T-cells T-cells ( TC) structure, 1599F T cell development, 1586, 1587, 1587F T cell-independent antigen, 1598–1599 T cell-mediated immune response, 1540 T cell receptor(s), 1570–1571, 1580F, 1599F antigen presentation to, 1590 assembly in ER, 768 B-cell receptor vs., 1595–1596 CD3 complex association, 1590F g chain, 1571 MHC protein/antigen interactions, 1574F 1574F,, 1577–1579, 1579F, 1580F signaling function, 1590F structure, 1570–1571, 1570F, 1571 TCF4 gene regulatory protein, colorectal cancer, 1439 TCP-I chaperone, 390F Tectorial membrane, 1430, 1430F, 1430F, 1431F Tectum, optic, 1391, 1391F neuronal specificity and retinotectal map, 1392–1393 Teichoic acids, 1527 Telomerase, 292–294, 505 cell senescence and, 1107 nucleolar assembly, 363 structure, 292F see also Reverse transcriptases Telomere(s), 292–294 cancer, 1217 heterochromatin role see Heterochromatin length regulation, 293–294 senescence role, 293, 1107 yeast, 293, 294F meiotic homolog pairing and, 1274, 1274F repetitive DNA sequences, 210 evolutionary conservation, 292 replicative loss, 293 replication, 210, 210F, 292, 294F T-loops, 292, 293F see alsoTelomerase alsoTelomerase

Tetraspanin, Tet repressor, repressor,1298–1299 synthetic biology, 461F TFIIH transcription factors, 340–341 seeTranscription TFII transcription factors see Transcription factors,general seeTransforming TGFb superfamily see Transforming growth factor-b (TGFb) family Trans ans Golgi network (TGN) TGN see Tr TH see Helper T-cell(s) (TH) TH17 cells, 1594 Thalassemia, b-globin abnormalities, 288, 288F 288F,, 355F, 452 Therapeutic cloning, 507, 507F, 508 Thermal motions, 49, 49F Thermodynamics, 66–67, 118–119FF entropy, 66–67, 67F first law, 67–68, 118F second law, 66–67, 118F see also Free energy Thermofilum, tree of life, 16F Thermomicrobium, tree of life, 16F Thermotoga maritima, 10F, 18T Thick filaments, 1012F see also Myosin Thoracic duct, 1549, 1549F Threading, computational protein analysis, 139 Threonine, structure, 129F Thrombin, 159 Thy1 protein, 1599, 1599F Thylakoid(s), 719–720, 842–843, 843 membrane, 713F, 843, 843F, 852F protein transport, 719–720, 720F vesicles, generation, 698 Thylakoid space, 843, 843F Thymidine, 3H-thymidine autoradiography, 282–283, 284F, 602–603 Thymine, 197 base-pairing, 198F dimer formation, 296, 297F structure, 116F, 301F, 332F Thymosin, actin filament modification, 999 Thymus, 1541F, 1541F, 1585–1586 organization, 1585F organ-specific protein expression, 1587–1588 T cell selection, 1585–1586 Thyroid hormone, 890, 907T receptor, 891F Thyroxine, 889F Tight junction(s), 1150–1158 epithelial cells, 806, 1133, 1134F, 1134F, 1150–1151 functions, 1150–1153 junctional complexes, 1153–1155, 1154F paracellular transport, 1152 as permeability barriers, 1151–1152, 1152F scaffold proteins, 1153–1155 structure, 1152–1153, 1152F, 1153F transcellular transport, 1151, 1151F transmembrane adhesion proteins, 1153 TIM23, 718 Tim clock gene, 462F TIM complex, 714–715 membrane association, 714F mitochondrial protein import, mechanism, 716–717, 716F, 718F, 719 Timeless protein, 462F Tip cell, capillary sprouting, 1447 Tissue(s) basal lamina see Basal lamina

Tam3 transposon, 318T Tandem affinity purification tagging (tap-tagging), 515–516 Tandem mass spectrometry, 519–521, 522 Tap-tagging, 515–516 Target proteins, apoptosis, 1118–1119 1118–1119 Tar RNA structure, transcription attenuation role,

replicative cell 1073F, senescence Telophase, 1055, 1073F , 1090 and, 293, 1107 seeTransmission TEM see Transmission electron microscopy Temperature-sensitive mutation(s), 557, 557F, 557F, 1057, 1057F Templated polymerization, 3–4, 3F DNA, 200, 200F, 201F, 266, 266F, 267F, 268F


cell–cell interactions, 1139–11401132F selective adhesion,1131–1132, , 1139F, 1140F selective assortment, 1140–1141, 1141F, 1142F see also Cell adhesion; Cell junction(s); Extracellular matrix (ECM) cell growth and, 1102, 1108

478 TATA-binding TA TA-binding protein (TBP), 340, 341FF, 342F

information transmission, 3–4, 3–5, 3F, 4F, 5F, 333, 334F

connective see Connective tissue developmental segregation, 1140–1141, 1141F 1141F,,

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



1142F engineering, 1479 epithelial see Epithelia explants, 504 extracellular factors, 1102, 1110 organization and maintenance, 1140 polarity, 1155 renewal, 1417–1484 repair, 1193, 1477 sectioning, microscopy sample preparation, 585, 585F, 605 specialized, 1417–1484 variety, 1131 see also specific speci fic tissues tissues 503–504 Tissue culture, explants, 504 historical aspects, 504 requirements, 503–504 spinal cord, 504 see also Cell culture Tissue explants, 504 Tissue-inhibitors of metalloproteinases ( TIMPs), 1194 Tissue slices, microdissection techniques, 502, 503F Tissue staining, 554–555, 579, 585F Tissue-type plasminogen activator (tPA), 1194 Titin, 1028, 1028F Tjp protein family, 1154 T-loops, 292, 293F T lymphocytes (T cells) see Lymphocyte(s); T cell(s) Tn3 transposons, 318T seeTumor TNFa see Tumor necrosis factor-a (TNFa) Tobacco cells, cell culture micrograph, 504F Tobacco mosaic virus (TMV), (TMV), self assembly, 149 Toll-like proteins, 1530–1531 Toll-like receptors (TLRs), 1530–1531, 1530F, 1530F, 1542 activation, 1533–1534 dendritic cells, 1531, 1536 inflammatory response, 1533–1534 Tomato Tomat o bushy stunt virus, virus, capsid, 149F TOM complex, 714–715, 714F, 716–717, 716F, 718F Tomography,, electron microscope (EM), 611F, 612, Tomography 612F Tonoplast(s), plant vacuoles, 782F Topoisomerases see DNA topoisomerases TOR kinase, 934, 1108 Torso protein, 1333F, 1333F, 1334, 1334F Total cell mass, control, 1102, 1111–1112 Total internal reflection fluorescence microscopy (TRIF), 599, 600F Totipotency, Totipot ency, plant cells, 568 Toxin(s), 1493 bacterial see Bacterial toxins cholera, 1492 mechanism of action, 1493–1494 Toxoplasma Toxop lasma gondii conoid, 1509 host cell membrane traffic, 1512 invasion of host cells, 1509, 1510F structure, 1489F vacuole formation and replication, 1509, 1510F Toy (twin of eyeless) gene, 466F TP53 TP 53 seep53 gene/protein TPA (tetradecanoylphorbol (tetradecanoylphorbol acetate), as tumor promoter, 1226 Trabecular bone, 1470, 1470F Traction, cell movement, 1040–1041, 1041F Transcellular transport, 658–659, 659F tight junction(s), 1151, 1151F Transcription, 4–5, 4F, 331–343, 334F, 335F basic principles, 4F, 331, 332–333, 333, 334, 334F, 335–336 see also Messenger RNA directionality, 339, 339F DNA signals, 336–340 consensus sequences, 338–339, 338F heterogeneity, 338–339 promoters, 337 elongation, 343–346, 344F eucaryotic, 339, 339–346, 341F, 343F, 399F elongation, 343–345 initiation, 341F,DNA, 343F863 mitochondrial RNA polymerases, 339, 339–340, 340T see also RNA polymerase(s) RNA processing, 345–346 see alsoTranscription alsoTranscription factors, general (TFI I) fidelity, 270, 334

initiation, 336–337 abortive, 337F complex, 341–342 eucaryotic, 339, 340–342, 341F 341F,, 343F histone code reading, 444F promoters, 338–339 seeTranscriptional transcriptional activators see Transcriptional activator(s) see also Promoter elements procaryotic (bacterial), 336–338, 337F, 338–339, 338F, 339F, 345F directionality, 339, 339F promoters, 337, 337F, 338F RNA polymerase, sigma factors, 336,336–337, 337F 337F terminators, 337, 339 transcription attenuation, 477–478 rates, 334, 337, 370 replication vs., 333 RNA polymerase orientation, 339, 339F rRNA genes, 361F termination, 337, 339 universal principles, 4–5 Transcriptional activator(s), 341, 342–343, 343F, 343F, 435 eucaryotic, 436F coactivators, 445, 447F complex formation, 447, 447FF holoenzyme interaction, 438F repressor interactions, 445, 446F structure, 441, 442, 442F see also DNA-binding motifs transcriptional synergy, 444–445, 444F see also RNA polymerase II mechanisms, 436F procaryotic, 418T, 420F, 435–436, 436, 436F Transcriptional control of gene expression, 379F, 415, 432–477 seeTranscriptional activators see Transcriptional activator(s) eucaryotes “action at a distance,” 438F cell cycle control, 1065, 1104, 1104F complexity, 434–436 DNA looping, 438F under Gene gene regulatory proteins see underGene regulatory protein(s) procaryotes vs., 434–436 promoters, 339, 438F, 440 see also Promoter elements regulatory elements, 438F, 440 insulators, 453 locus control regions (LCRs), 450–452, 452F seeTA TATA TA TA box see TATA TA box transcriptional attenuation, 478 transcriptional synergy, 444–445, 444F 444F,, 464–465 see also DNA-binding motifs; Transcription factors,general (TFII) evolution, 439–440 heritability, 458, 458F procaryotes (bacterial), 436FF, 438–439, 439F, 439T, 477–478 eucaryotes vs., 434–436 Lacoperon Lac seee La Lac coperon operon se operon (Escherichia coli) regulatory proteins see Gene regulatory protein(s) repressors see Repressor protein(s) see also RNA polymerase(s) Transcriptional mediator, 343 Transcriptional repressors see Repressor protein(s) Transcriptional silencing see Gene silencing Transcriptional synergy, 444–445, 444F, 444F, 464–465 Transcription attenuation, 477–478 Transcription circuits, 459–460, 459F, 459F, 460F Transcription-coupled repair, 299–300 Transcription factors, general (TFII), 340–342 activator protein interaction, 438F function, 340 nomenclature, 340 repressor protein interaction, 445, 446F TATA TA TA box-binding, 340–341, 341–342, 341–342, 341F, 342F, 342F, 438F transcription initiation, 341F Transcription initiation complex, 341–342 Transcription unit(s), 336, 477 see also Gene(s) Transcytosis, 793, 793F, 793F, 797–798, 797F glucose transporters, 798

recycling endosomes, 798 Transducers, 1429 Transesterification reactions, pre-mRNA splicing, 347–348, 348F Transfection, DNA cloning vectors, 540–541 Transferrin receptor, 794 Transfer RNA (tRNA), 6, 7F, 368–369 aminoacylation reaction, 370–371, 371F, 372F accuracy, 371–373 origin, 407 synthetase recognition, 372–373, 372F see also Aminoacyl-tRNA synthetases aminoacyl-tRNA–ribosome binding, 375–376, see Anticodon(s) anticodons375F evolutionary significance, 407–408 function, 336T initiator tRNAs, 380 modification, 368F, 369, 369F, 370F peptidyl-tRNA–ribosome binding, 375–376, 375F structure, 368, 368F, 370F, 373F transcription, 335–336, 863 see also Genetic code ‘Transformed’ phenotype, cancer cells, 506T, 506T, 1232, 1233 Transfor Tr ansformer mer (Tra) gene, Drosophila sex determination, 481F, 482F Transforming growth factor-b (TGFb) family activation of Smad-dependent signaling pathway, 939–941, 940F animal development, 1316F Arabidopsis absence of, 1400 Drosophila development, 1336 inhibitor signals, 1103, 1110, 1111F loss of function mutations, 1243 myostatin, 1466 proteoglycans and, 1183 regulatory T cell(s), 1575 skin, 1426 Transgenic organism(s), 566–568 plants, 568–569, 569F, 570F production, 566–568, 570F site-specific recombination, 325–326 Cre/Lox system, 567–568 see also Gene knockouts Trans Golgi network (TGN), 772 electron micrograph, 771F functional compartmentalization, 778F lipid raft assembly, 807, 807F M6P receptor proteins, 784 protein sorting pathways, 801F, 801F, 807F structure, 771F transport, 779–787, 785F see also Exocytosis Transit amplifying cells, 1422–1424, 1422F benefits, 1425–1426 growth control strategy, 1423 gut epithelium, 1437 Transitional endoplasmic reticulum see Endoplasmic reticulum (ER),smooth Transition state, 160 activation energy, 160, 160F analogs, 160, 161F stabilization, enzyme catalysis, 159–160, 160, 164 Translation, 4–8, 4F, 331, 366–383, 376F accuracy, 270, 382 EF-Tu EF-T u role, 377–378 free energy expenditure, 385 basic principles, 4–8, 4F decoding, 367, 367F adaptor molecules, 371, 372F reading frames, 368, 368F see also Genetic code; Transfer RNA eucaryotes, 345F, 380, 380F, 399F ribosomes, 360–361, 362–363, 374F seeTranslational gene expression regulation see Translational control of gene expression historical aspects, 366–367 inhibitors, 384, 385T initiation, 379–380, 380F bacteria, 380, 488380F, 487–488 eucaryotes, 380, formylmethionine, 380 initiation codon, 380, 489–490 initiation factors (eIFs), 380, 488–489, 490F initiator tRNA, 380 internal ribosome entry site (IRES), 491

seeTranscriptional gene expression regulation see Transcriptional control of gene expression

IgA, 1556F insulin receptor, 798, 798F

leaky scanning, 490 mRNA cap, 1517


mRNA signals, 379 procaryotic, 1527 viruses, 1517 peptide chain elongation, 373F, 375F, 375F, 376F elongation factors, 377–378 peptidyl transferase, 375–376, 379, 379F see also Protein synthesis quality control, 382–383, 385–387, 387F see also Nonsense-mediated mRNA decay regulation, 489F termination, 381, 381F viral RNA, 1517–1518 see also Messenger RNA (mRNA); Protein


DNA-only, 317, 318F, 318T retrotransposons, 317, 318T see also Retrotransposons; Retroviral-like retrotransposons evolutionary movements, 323 b-globin genes, 250F human genome, 207F insertional mutagenesis, 528F 528F,, 556 phylogenetic variation, human vs. mouse, 323F seeTransposition transposition mechanism see Transposition see alsoTransposase; alsoTransposase; individual elements Trans-splicing, Trans -splicing, 354–355, 354F SL RNP, 353, 354F

TUNEL technique, apoptotic cells, 1117, 1118F Turgor pressure, 781, 1197, 1199 Turnover number, enzyme catalysis, 159–160 Twin studies, epigenetics, 473, 473F Twistgene/protein, Twist gene/protein, 1141, 1335 Two-component signaling pathway/system, 942, 944F Two-dimensional polyacrylamide gel electrophoresis (2D-PAGE), 521–522 gene expression analysis, 412, 414F isoelectric focusing step, 521, 521F, 522F SDS-PAGE step, 521–522 visualization, autoradiography, 522F

cytoplasmic polyadenylation, 493 initiation regulation, 489–491, 490F internal ribosome entry site (IRES), 491 mRNA degradation, 492–493, 492F negative, 488, 490F see also Messenger RNA (mRNA) Translational frameshifting, 383, 384F Translational recoding, 383, 383F, 383F, 384F Translational repressors, 488, 490F Translation release factor (eRFI), molecular mimicr y, 382F Translocase of the inner mitochondrial membrane seeTIM see TIM complex Translocase of the outer mitochondrial membrane seeTOM see TOM complex Translocations, chromosomal see Chromosome translocation Transmembrane adhesion proteins, tight junction(s), 1153 Transmembrane protein(s), 629–630, 630F assembly, 634 b barrel conformation, 632, 634–635, 635F cell–cell adhesion, 1134–1135, 1134F, 1134F, 1135T, 1153 see also Cadherin(s) cell–matrix adhesion, 1169, 1177T see also Integrin(s) domains, 632 a-helix conformation, 631–632, 632F a-helix interactions, 632–634 hydrogen bonding, 632 hydropathy plots, 632 multipass, 632, 634F, 634FF, 653, 734–735, 734–736, 735F single-pass, 632, 636F 636F,, 733–734, 733F transport, small molecules, 651 see also Porin(s); specific proteins/types Transmission electron microscopy (TEM), 604–607, 604F 3-D reconstruction, 606, 607F immunoelectron microscopy, 606–607, 607F microscope, 604–605, 604F sample preparation, 605–606, 605F surface analysis, 608–609 metal shadowing, 608–609, 610F Transmitter-gated ion channel(s), 682–684, 892 acetylcholine receptors as, 684–686 localization, 683 neuromuscular junctions, 684–686, 687–688 permeability changes, 683 psychoactive drug effects, 686–687 see also specif specific ic receptors Transplantation reaction, 1575–1576 Transporters/transport proteins see Carrier protein(s) Transport vesicle(s), 749, 760 seeTransposon(s) Transposable elements see Transposon(s) Transposase, 317, 318F alternative splicing, 480 DNA-only transposons, 317, 318T genes, 318F Transposition, 316 DNA-only transposons, 318T cut-and-paste mechanism, 319F 319F,, 320F enzymes, 318T

trypanosomes, 354,meiotic 354F homolog pairing, Transverse filaments, 1276, 1277F Treadmilling, 976–980, 977FF Tree of life, 12–13, 12–13, 15–16 Treponema pallidum, 14F genome size, 18T Triacylglycerols, 115F energy storage, 95, 96F fatty acid storage, 58 structure, 97F, 114F Tricarboxylic acid cycle see Citric acid cycle Tricellulin, 1153 Trichomonas, tree of life, 16F Trichothiodystrophy,, mouse knockouts, 568F Trichothiodystrophy seeTriacylglycerols Triglyceride(s) see Triacylglycerols Trimeric GTP-binding proteins (G proteins) see G protein(s); G protein(s) (trimeric GTP-binding proteins/ATPases) Triosephosphate isomerase, 120F, 120F, 161F Trioses, 112F Triple response, growing seedling, 957, 958F Triple snRNP, snRNP, splicing mechanism, 350F Trithorax group, 1344 Triton, membrane protein solubility, 637 Trk A, 923T TrkA receptor protein (NGF receptor), 1390 seeTransfer tRNA see Transfer RNA tRNA-splicing endonuclease, 369, 370F Tropoelastin, 1190 Tropomodulin, 1003 Tropomyosin, Tropomy osin, 349F, 480, 994F, 994F, 1001 Trypanosoma, 16F, 354, 354F, 483, 484F Trypanosoma brucei, 1502, 1519F, 1520 Trypanosoma cruzi, 1509, 1511, 1511F Trypanosome(s) antigenic variation, 1519F 1519F,, 1520 tsetse flies, 1502 Trypsin, cell isolation techniques, 502 Tryptophan, 129F, 129F, 433F Tryptophan operon, 433F Tryptophan repressor, 433–434, 433F, 433F, 434F helix-turn-helix motif, 420F T segments, Drosophila, 1329 Tsetse fly, 1502 T-SNAREs see SNARE proteins, target membrane SNAREs Tubercle, 1507 Tuberculoid leprosy, 1593–1594 1593–1594 Tuberculosis, 1488, 1507–1508, 1508 see also Mycobacterium tuberculosis Tube worms, 13F Tubulin(s) bacterial homolog, 989 evolutionary conservation, 982–983 filament assembly, 973–975 isoforms, 982 photoactivation visualization, 594–595, 595F polymerization, time course, 914F structure, 973 T-form and D-form, 980 g-tubulin, -tubulin, 992, 992F, 998 see also Microtubule(s) g-Tubulin -Tubulin ring complex ( g-TuRC), -TuRC), 992, 992F, 994F, 1077, 1079 Tumor(s) see Cancer; specific types/locations Tumor initiators, 1226, 1227 Tumor necrosis factor-a (TNFa), 953, 953F, 1592,

Two-hybrid methods, 523–524, 524F see also Protein–protein interactions Two-hybrid system, 523–524, 524F “Two-photon”ef fect, confocal microscopy, 592, 592, 592F Ty1 retrotransposon, 318T Type III secretion system, bacterial toxins, 1493, 1494F, 1504 Tyrosine aminotransferase, gene expression regulation, 415 Tyrosine kinase(s), 177F B cell receptor signaling, 1590F receptor-linked see Receptor tyrosine kinases (RTK) T-cell receptor signaling, 1590F see also Src family of protein tyrosine kinases Tyrosine-kinase-associated receptor, 922, 935 Tyrosine, structure, 129F

see also speci specific enzymes recombination see fic mechanism Site-specific retrotransposons, 318T viral integration, 321F Transpositional site-specific recombination see Transposition Transposon(s), 317, 1599

1598T 1226, 1227 Tumor promoter(s), Tumor suppressor genes (TSGs), 1231, 1232F genetic vs. epigenetic change, 1237F hereditary cancer syndromes, 1234–1235 identification, 1234–1235 loss by mutation, 1235–1236

Urea cycle, mitochondria, 867 Urease, 1503 3H-Uridine autoradiography, 603 Uridine isomerization, rRNA modifications, 361, 362F Urokinase plasminogen activator (uPA), 1194 UTR see Untranslated regions

synthesis; Ribosome(s) Translational control of gene expression, 379F, 415, 488

U U1 snRNP, snRNP, splicing mechani sm, 350F U2AF spliceosomal protein, 350F U2 snRNP, snRNP, splicing mechani sm, 350F U4 snRNP, snRNP, splicing mechani sm, 350F U6 snRNP, snRNP, splicing mechani sm, 350F UAS (upstream activating sequence) element, 1350F Ubiquinone see Coenzyme Q Ubiquitin, 392–393, 740F Ubiquitin-activating enzyme, 393, 394F Ubiquitin ligase(s), 393, 394F, 396F cell cycle control, 1064, 1065F 1065F,, 1066T SCF, 184–185, 185F, 188 see also speci specific fic enzymes Ubiquitin pathway, 393–394, 394F, 396F activation, 393–394, 394F enzymes, 393, 394F N-terminal degradation, 395–396 proteasome targeting, 393–394 protein labeling, 395F ubiquitin, 393, 740F see also Proteasome(s) Ubiquitylation, histone tails, 223F Ultracentrifugation cell fractionation, 510–511, 511F microsome purification, 726 preparative ultracentrifuge, 510–511, 510F Ultraviolet (UV) radiation DNA damage, 296, 297F, 298 see also DNA damage; DNA repair sensitivity, DNA repair defects, 295T Unc5H, netrin receptor, 1389 Unc5, netrin receptor, 1389 Unc6 gene, 1388 Uncgenes, Unc genes, 1388 Uncoupling agents, 836, 838 Uniporter(s), 656, 656F Unit evolutionary time, protein evolution, 265 Universe, time line see Origin of life Untranslated regions 3¢ untranslated region, 487, 488, 488F 5¢ untranslated region, 488 Upstream ORFs, 490 Uracil, 116F, 332, 332F, 333F Uranium, electron microscopy stains, 606 Urea, 101

bacterial genome, 318F classification, 318T

UV light see Ultraviolet (UV) radiation

mechanisms of losing, 1236F see also individual genes/proteins

Page numbers in boldface refer to a major text discussion of the entry; page numbers with an F refer to a figure, with an FF to figures that follow consecutively; page numbers with a T refer to a table; vs means compare/comparison.



V Vaccines/vaccination, 1498, 1498F HIV prevention, development, 1521 Vaccinia virus, 1514F, 1516F, 1517 Valine, structure, 129F Valium, mechanism of action, 686 Vancomycin, resistance, 1523 Van der Waals forces, 51, 51F, 54, 110F bond length/strength, 53T protein folding, 130F Van der Waals radius, 51, 110F Variable domain 1563 genes, heavy Ig chai ns, 1559F, 1560F light Ig chains, 1559F, 1560F Variable number tandem repeats (VNTRs), 547F Varicella zoster virus, microtubule-based movement, 1516–1517 Variegation, 866, 866F Vasa family proteins, 1282 Vascular cell adhesion molecules (VCAMs), 1146 Vascular endothelial growth factor (VEGF) cell–cell junctions and, 1145 ECM binding, 1183 endothelial cells, 1448, 1449 role in tumour progression, 1221 Vascular tissue blood vessels see Blood vessels of plants, 1402, 1404F Vasopressin, 907T VE-cadherin, 1138T, 1145 Vectors DNA cloning, 540–541, 541FF see also DNA cloning of pathogens, 1501–1502 protein expression, 546, 548, 548F 548F,, 548FF virus transmission by, 1502 “Velcro principle” cadherin adhesion, 1138–1139, 1139F integrin adhesion, 1174 Velocity sedimentation, 510–511, 512F Vertebrate(s) development see Vertebrate development times of evolutionary divergence, 43F Vertebrate development, 1363–1378 cadherins and, 1139–1140, 1140–1141, 1140F, 1141F see also Cadherin(s) cell movements and shaping of body plan, 1363–1378

blastula, 1363F, 1365, 1366F cell adhesion and sorting-out, 1369–1370, 1370F cleavage, 1365, 1365F convergent extension, 1368–1369, 1369F egg asymmetries in amphibia, 1364, 1364F gastrulation, 1365–1369, 1366F, 1367F left-right asymmetry, 1376–1377, 1376F mid-blastula transition, 1365 migratory cells, 1373–1375 myoblast migration, 1373–1374, 1374F neural crest, 1374, 1374F neurulation, 1370–1371, 1370F 1370F,, 1372F notochord, 1370–1371 pigment cells, 1375, 1376F somite formation, 1371–1372, 1372F see also under Xenopus laevis development mouse see Mouse development neural crest, 1140, 1140F neural tube formation, 1140, 1141F Xenopus laevis see Xenopus laevis development see also individual processes processes and species Vesicular transport, 701, 701F, 750–766, 750F coated vesicles see Coated vesicle(s) docking specificity, 760–761, 761–762 ER to Golgi apparatus, 766–787 exocytosis, 799–809 see also Exocytosis Golgi apparatus transport to cell surface, 799–809 see also Exocytosis 779–787 to lysosomes, model, 777–778 investigations, 752, 752F, 753, 753F organelle relationship, 701F secretory vesicles see Secretory vesicle(s) SNARE proteins and see SNARE proteins

formation, 769, 769F retrieval pathway, 769, 769F 769F,, 770F transport from ER to Golgi apparatus, homotypic membrane fusion, 768, 769F Vibrio cholerae, 14F bacteriophage, 1491 chromosome, 1492F colonization of gut, 1503 CTX f bacteriophage, 1492F gene map, 1492F pandemics, 1491 structure, 1489F toxin see Cholera toxin

Vitamin D, 890 receptor, 891F Vitamin D3, 889F Vitelline layer, 1287 Vitreous ice, 605, 610 V(D)J joining, 1564–1566 class switching vs., 1568 control, 1565–1566 recombination signal sequences, 1564F V-J joining process, klight chain production, 1563F V(D)J recombinase, 1564 Voltage-gated calcium channel(s), 682, 687–688 Voltage-gated ion channel(s), 676–678

virulence genes, 1491 1007 Villin, actin cross-linking, Villi, of small intestine, 1436, 1436F, 1441 Vimentin, 985, 985T Vinblastine (vincristine), 988T Viral infection(s) interferon-g, effects of, 1406F vaccination, 1498, 1498F see also Virus(es); specific infections/organisms Virion, definition, 1496 Virulence factors, 1491 anthrax, 1493 type III secretion system for, 1493, 1494F, 1494F, 1504 see also Bacterial toxins Virulence genes, bacterial, 1491 Virulence plasmids, 1491, 1491F, 1492F Virus(es), 1488, 1496–1498, 1534–1536 adhesion to host cells, 1505–1506 bacterial see Bacteriophage(s) bloodborne, 1502 as carcinogens, 1227–1228 see also DNA tumor virus(es) cytolytic effects, 1496 diversity, 1488 DNA tumor virus(es), 1247–1249, 1248F entry and uncoating, 1505, 1506F enveloped, 1497, 1497F, 1505, 1513, 1514F enzymes encoded, 1517–1518 evolution, 1520–1521 genome, 1496, 1497, 1497F genome integration see Mobile genetic elements; Site-specific recombination host cell membrane traffic changes, 1513–1514, 1514F host metabolism changes, 1517–1518 intracellular movement, 1514–1517 life cycles, 1496–1497, 1496F MHC class I expression inhibition, 1535–1536 morphology, 1496, 1496F nonenveloped, 1497, 1507 plant, plasmodesmata and, 1163 proteins, 1497 protein synthesis, 1517, 1535–1536 receptors, 1505–1506 replication, 1497 retroviruses see Retroviruses RNA viruses see RNA virus(es) size, 1496 structure, 148–149, 1496 capsids, 148, 148F, 149F, 150F, 1489F, 1497, 1513 icosahedral, 611F, 612 nucleocapsid, 1497F self assembly, 149 spherical, 150F transmission by vectors, 1502 see also specific infections/organisms Visual connections, in mammalian cortex, 1395–1396 molded by experience, 1395–1396, 1395F segregation of right- and left-eye inputs, 1395, 1395F Visual cortex, ocular dominance columns, 1395F Visual experience, influence on ocular dominance columns, 1395F Visual transduction, 917–918 adaptation, 920, 920F amplification of signal in rod photoreceptors,

see also speci specific fic types Voltage-gated potassium channel(s), 677 delayed, 678, 689 epilepsy, 682 evolutionary relationship, 682 inactivation, ball-and-chain model, 678F mutants, 678 Voltage-gated sodium channel(s) inactivating mechanism, 676 neuromuscular junctions, 687 states, 676–677 Volvox, 501F Von Hippel–Lindau (VHL) syndrome, 1449 V-SNAREs, 762–763, 763F V-type pumps (ATPases), 660

919–920, 920F photoreceptor cells, 918 see also Arrestin; Rhodopsin; Rod photoreceptors (rods) Vitamin(s) as coenzymes, 167, 167T see also individual vitamins

W Arabidopsi dopsiss thali thaliana ana Wall cress see Arabi Warburg effect, 1245 WASp family, 1043, 1516, 1516F Water, 108–109FF cell content, 51–52 channel(s) see Aquaporin channel(s) chemical properties, 51–52 electron source, 851, 873 functional roles, proteins, 154 proton behavior, 828, 828F solvent, 109F structure, 52F, 108F Water-splitting enzyme, 851, 852F 852F,, 873 Watson, James D., 196 Wee1 kinase, 1063, 1074, 1074F Werner syndrome, DNA repair disorders, 295T Western blotting, 518, 519F White blood cells see Leucocyte(s); individual cell types Whooping cough (pertussis), 1503 see also Pertussis toxin “Winding problem,” DNA replication, 278F Wing bud, 1355F Wing imaginal disc, 1356F Wingless (Wg) gene/protein, 1353, 1353F in Drosophila segmentation, 1340 in vertebrate limb, 1355 see also Wnt signaling pathway Wingless signaling pathway, 1353 see also Wnt signaling Wing margin, 1201, 1352 Wire protein models, 133F Wnt signaling pathway absent inArabidopsis, in Arabidopsis, 1400 animal development, 1316F b-catenin, 948–950, 949F in bone marrow, 1458 cell–cell adhesion and, 1145 colorectal cancer, 1253 gut stem-cell population maintenance, 1438–1441 planar cell polarity, 1158 in skin, 1426 Wobble base-pairing, 369, 369F Wolbachia host behavior modification, 1518 infection treatment, 1518 microtubule-based movement, 1517, 1517F vertical spread, 1517, 1518 see Caenorh Caenorhabdit abditis is elegans Worm Wound(s) angiogenesis, 1448, 1448F healing angiogenesis, 1448 control of cell turnover, 1425–1426 role of TGFb, 1426

Vesicular tubular clusters, 768–769 electron micrograph, 769F, 772F

see also individual vitamins Vitamin A, 640, 890 Vitamin C, deficiency, 1186

infection route, 1501–1502 WRKY (Zn finger) gene regulatory proteins, family


members in different eucaryotes, 1400T Wuschel protein, 1410, 1410F

X X-chromosome(s), 202, 473, 1271, 1284 inactivation see X-inactivation meiotic pairing, 1275 Xenografts, transplantation reactions, 1575 Xenopus laevis, 39, 39F Xenopuss laevis development development see Xenopu genome duplication,38–39 38–39 species differences, Xenopus laevis development, 1363F cell movement during development, 1363 effect of blocking Notch signaling in, 1360F egg, 1364F cell-free systems, 1058, 1058F fertilization, 1057 growth, 1058F microtubule dynamics during mitosis, 1080, 1081F embryo cell cycle analysis, 1057–1058, 1057F cleavage, 1058F gastrulation, 1365–1369, 1366F, 1367F, 1368F, 1369F cell movements, 1365–1367, 1365F, 1366F, 1367F cell packing changes (convergent extension), 1368–1369, 1369F signals controlling, 1367 Xenopus ruwenzoriensis, 39 Xenopus tropicalis, 39, 39F Xeroderma pigmentosum (XP), 295T, 1208 XIC (X-inactivation center), 474 X-inactivation, 473–475, 473F, 474F Barr body, 473 dosage compensation, 473, 475–476 histone H2A variants, 474–475 histone H3 variants, 475 histone H4 variants, 475 mechanism, 285, 473–475, 473F mosaics, 1209F random chromosome choice, 473–474 see also Gene silencing; Genomic imprinting X-inactivation center (XIC), 474 XIST RNA, 473F 473F,, 474 XMAP215, microtubule formation, 995F 995F,, 1004, 1004F Xpdgene/protein, Xpd gene/protein, mouse knockouts, 568F

X-ray(s), 527–528 sensitivity, DNA repair defects, 295T synchrotron sources, 529 X-ray crystallography DNA, 195–196, 197 electron density maps, 528 historical aspects, 530T IgG structure, 1561F protein structure determination, 139, 527–529, 528F


mitochondrial DNA, 863 inheritance, 864–865, 865F petite mutants, 866–867 mutagenesis, deletion cassettes, 570 Yersinia pestis, 1502, 1502F, 1520 Yersinia pseudotuberculosis, 1508, 1520 Yolk, 1287, 1290 Yolk granules, 1287


Zap70 tyrosine kinase, 1590F

YACs see Yeast artificial chromosomes ( YACs) Y-chromosome, 202, 473, 1271, 1284 meiotic pairing, 1275 Srygene, Sry gene, 1284 Yeast(s), 33, 606F, 1494 budding see Budding yeast(s) cell cycle control, 1056–1057, 1056F, 1057F, 1062, 1063F chromosome replication, 210 E. coli coli vs., 34 fermentations, 90 see also Glycolysis fission yeast see Schizosaccharomyces pombe gene expression analysis, 34–35 genetics see Yeast genetics genome, 34, 318T metabolic map, 102F mitochondria, 857, 858F, 867F DNA, 863, 864–865, 865F 865F,, 866–867 as model eucaryote, 33–34 ‘protein-only inheritance,’ 398, 398F protein transport studies, 703F reproductive cycles, 34F sexual reproduction, haploid vs. diploid cells, 1269–1270, 1270F “shmoo,” 1044, 1044F in tree of life, 16F two-hybrid methods, protein–protein interactions, 523–524, 524F utility as model organisms, 1056 vacuoles, lysosomal properties, 781–782 Yeast artificial chromosomes ( YACs), 541, 542F Yeast budding cellular polarity, 880, 1044, 1045F mating types, 1044 signaling pathway, 880, 880F, 1045F Yeast genetics gene regulatory proteins, DNA sequence recognition, 418T

Z disc, 1026, 1027F Zebrafish, 255, 556, 592F 592F,, 1391F Zellweger syndrome, 723 Zigzag model, 30-nm fiber formation, 217, 217F Zinc finger motifs, 421, 421–422, 422F Zinc finger proteins, 421–422, 422F, 423F DNA-binding, 422F sequence specificity, 427F structure, 421, 422F types, 421–422, 422F, 423F zinc finger repeats, 421 Zinc protease, lethal toxin, 1493 Zona adherens (adhesion belt), 1142, 1143F seeTight Zona occludens see Tight junction(s) Zona pellucida, 1287, 1288F, 1291F, 1298, 1298F, 1300 ZO proteins, 1154 ZP1 glycoprotein, 1298 ZP2 glycoprotein, 1298, 1300 ZP3 glycoprotein, 1298, 1300 Z-ring, formation during cell division, 989, 989F Z scheme (photosynthesis), 852 Zygote, 1269 centrioles, 1301, 1301F reconstruction (cloning), genome preservation, 411, 413F zygotic-effect genes, 1337 see also Fertilization Zygotene, 1275 Zygotic-effect genes, 1337 Zymogens, 793

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