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Dedication

In memory of Gordon Hartman (1936–2004), friend and colleague whose enthusiasm and encyclopaedic knowledge were an asset to all who knew him.

MitochondrionInner membrane

Outer membrane

Intermembranespace

urocanate

histidine

4-imidazolone-5-propionate

2

FIGLU

N 5-formimino -THF

glutamate

NADPH+H+

ATP

ADP+Pi

NADH+H+

g

glutamateg-semialdehyde

(P 5-C)

proline

FADH2

FAD

ornithine

NH4+

N 5,N 10

-methenyl-THF

folatecycle

THF

NAD+

NADP+

NADPH+H+

NADP+

4H+10H+4H+ 4H+ 2H+

4H+ 4H+

H+Pi

H+

QC

NAD+

ADPNADH+H+

ATP

ATP

ComplexComplexComplex

H2O Pi

–O212

2H+

FO

F1

Respiratory chain

ATP

ADP

H2O

a-ketoglutarate glutamate

aspartate

alanine

cysteineserine

glycine

pyruvate

NAD+ NADH+H+

pyruvate

oxaloacetate

lactatemalate

GTPGDP CO2

phosphoenolpyruvate

2-phosphoglycerate

3-phosphoglycerate

NADH+H+

NAD+

H2O

Pi

ATP

ADP

dihydroxyacetonephosphate

ATP ADP

glucose

ATP

ADP

1,3-bisphosphoglycerate

fructose1,6-bisphosphate

fructose6-phosphate

glucose6-phosphate

Pi

Pi

Endoplasmic reticulum

CytosolPi

a-ketoglutarate glutamate

NAD+

NADH+H+

H2O

Complex

4H+

2H+2H+

3H+

6H+

Complex

H+

F1

FADH2

ATPATP

Pi Pi

H+

4H+

H2O –O212

Complex4H+

Q

C

FO

ADP

Pi H+

NADH+H+

malate oxaloacetate

isocitrate

a-ketoglutaratesuccinyl CoAsuccinate

fumarate

a

CoASHH2O

citrate

[cis-aconitate]

CoASH

FAD

acetyl CoA

ADP+Pi

ATP CoASH

HCO3–

GTP GDP

CoASH

CO2

CO2

pyruvate

NAD+

NAD+

NADH+H+

H2O

Pi H+NADH+H+

NAD+

NADH+H+

NAD+

CO2

H2O

H2O

ADP ATPGTP GDP

FADH2

glutamate

NH4+

NADH+H+

FADH2

myristoyl CoA(C14)

C12

C10

C8

C6

C4

(8) acetyl CoA

palmitoylcarnitine

palmitoyl Co A

2 Pi

C14

acetoacetyl CoACoASH

“Ketonebodies"

acetoacetyl CoA

CoASH

hydroxymethylglutaryl CoA(HMGCoA)

acetoacetate

3-hydroxybutyrate

acetyl CoA

CoASH

NADH+H+

FADH2

NADH+H+

FADH2

NADH+H+

FADH2

NADH+H+

FADH2

NADH+H+

FADH2

acetyl CoA

acetyl CoAH2O

NAD+

NADH+H+

CoASH

b-Oxidation

Ketogenesis

glycogen

a (1Æ4) glucoseoligosaccharide(n+1 residues)

a Æ

uridine diphosphateglucose

PPi

UTP

a (1Æ4) glucoseoligosaccharide primer

(n residues)

glycogen(n–1 residues)

glucose1-phosphate

2 Pi

Pi

UDP NADP+ NADPH+H+

6-phosphogluconate6-phosphoglucono-d-lactone

glyceraldehyde3-phosphate

sedoheptulose7-phosphate

erythrose4-phosphate

fructose6-phosphate

fructose6-phosphate

glucose6-phosphate

NADP+ NADPH+H+

glyceraldehyde3-phosphate

fructose6-phosphate

glucose6-phosphate

glyceraldehyde3-phosphate

H2O CO2

Pentose phosphate pathway(hexose monophosphate shunt)

NADP+

NADPH+H+

b b

enoyl ACP

HCO3–+ATP

H++ADP+Pi

CoASH

malonyl ACP

CoASH

C6

malonyl CoA

acetyl CoA

acyl ACP

C4

acetoacetyl ACP

b

acetoacetyl ACP

malonyl CoA

cysteine–SHgroup of

condensingenzyme

hydroxymethylglutaryl CoA(HMGCoA)

acetoacetyl CoA

mevalonate

cholesterolmany intermediates

acetyl CoA

NADP+

NADPH+H+

H2O

D-3-hydroxybutyryl ACP

NADP+

NADPH+H+

H2ONADH+H+ NAD+

NADP+NADPH+H+

citrate

oxaloacetate

ADP+Pi

CoASH

ATP

malate

CO2

acyl carrier protein

CO2

CoASH

b

CO2

O2

tetrahydrobiopterin

dihydrobiopterin

NADP+

NADPH+H+

a-ketoglutarate

glutamate

4-hydroxyphenylpyruvate

homogentisate

4-maleylacetoacetate

fumarylacetoacetate

acetoacetate

phenylalanine

tyrosine

fumarate

oxidised byextrahepatic

tissues

L-DOPA

dopamine

noradrenaline

S-adenosyl-methionine

S-adenosyl-homocysteine

adrenaline

H2O

O2

CO2

O2

H2O

O2

CO2

H2O

Glycolysis

Krebs cycle

Regulatory enzyme

glutamine-PRPPamidotransferase

carbamoylphosphate

synthetase II

palmitoyl CoA (C16)

acyl CoAdehydrogenase

FAD

FADH2

enoyl CoAhydratase

L-3-hydroxyacyl CoAdehydrogenase

L-3-hydroxyacyl CoA

thiolase

3-ketoacyl CoA

CoASH

acetyl CoA

carnitine

(3) palmitateATP

CoASH

PPi+AMP

trans-D2-enoyl CoA

long chain acyl CoA synthetase

H2O

NADH+H+

NAD+

pyrophosphatase

inner CPT

outer CPT

ribulosephosphate

3-epimerase

ribose5-phosphateisomerase

ribulose5-phosphate

xylulose5-phosphate

ribose5-phosphate

transketolase

(thiamine PP)

H2OC16C14C12C10C8

acylcarrierprotein

ATP

ADPglycerol kinase

(not in whiteadipose tissue)

glycerol

tripalmitin(triacylglycerol)

palmitate

esterification

CO2CO2 CO2 CO2 CO2

glycerol3-phosphate

CoASH CoASH CoASH CoASH CoASH

palmitoyl ACP

thio-esterase

3 H2O

lypolysis hormonesensitive lipase(adipose tissue)

Fatty acid synthesis

CoASH

CO2

NAD+

NADH+H+

HCO3–

acetyl CoA

CoASH

CO2

dehydrogenase

CoASH NAD+

CO2

CoASH

argininosuccinate

lyase

synthetase

citrulline

ornithinetranscarbamoylase

2ADP+Pi2ATP

arginine

urea

isovaleryl CoAisobutyryl CoA

methylmalonatesemialdehyde

propionyl CoA

a-methylbutyryl CoA

D-methylmalonyl CoA

L-methylmalonyl CoA

succinylCoA

acetylCoA

acetyl CoA

CoASH

dehydrogenase

glutaryl CoApropionyl CoA

dehydrogenasedehydrogenase

acetyl CoA

THF

Vitamin B12

Odd numberedfatty acids

ornithine

NADH+H+

NAD+

CO2

CO2

CoASH

NADH+H+

NAD+

CO2

NAD+

NADH+H+ NADH+H+

Pi

carbamoylphosphateNH4

+

AMP+PPi

ATPaspartate

fumarate

mutase

acetoacetate

carnitineshuttle

carnitineshuttle

arginase

dehydrogenase

a-ketoisocaproatea-ketoisovalerate

aminotransferaseaminotransferaseaminotransferase

a-keto-b-methylvalerate

isoleucine valine leucine

a-ketobutyrate

threonine

glycine

lysine

saccharopine

2 aminoadipatesemialdehyde

2-aminoadipate

amino-transferase

a-ketoadipate

carnitineshuttle

N5, N10

-methylene THF

Ureacycle

H2O

H2O

CO2

H2O

H2O

CO2

glutamate

IMP

AIR

PRPP

fumarate

aspartate

ADP+Pi

ATP

AMP

ATP

ribose 5-phosphate

b-5-phosphoribosylamine

glycinamideribonucleotide (GAR)

formylglycinamideribonucleotide (FGAR)

FAICAR

AICAR

SAICAR

CAIR

formylglycinamidineribonucleotide (FGAM)

N10-formyl THF

glycine

glutamate

glutamine

glutamine

carbamoyl phosphate

carbamoyl aspartate

dihydroorotate

orotate

OMP(orotidine monophosphate)

aspartate

UMP(uridine monophosphate)

UDP

UTP

FMNH2

2ATP

glutamate

FMN

bicarbonate

GDP

GTP

RNA

ADP

ATP

DNA

dGTP dATP dTTP dCTPUTPCTP

CDP

dCDP

dCMP

dUMP

dTMP

dTDP

UTP

UTP

THF

THF

N 5, N10-methenyl THF

DHF

ATP

ADP+Pi

ATP

ADP+Pi

ATP

ADP+Pi

N10-formylTHF

glutamine

2ADP+Pi

PPi

ADP+Pi

ATP

N 5, N10-methenyl THF

DHF(dihydrofolate)

folate

THF(tetrahydrofolate)

N 5, N10--methylene THF

N10-formyl THF

N5-methyl THF

H2O

NADPH+H+

NADP+

NADPH+H+

NADP+

NADPH+H+

NADP+

NADPH+H+

NADP+

methionine

methyl grouptransferred to

acceptor

SAM(S-adenosylmethionine)

methyltransferase

S-adenosylhomocysteine

homocysteine

cystathionine

homoserine

cysteine

vitamin B6

homocysteinemethyltransferase

N5-methyl THF

THF

homocysteine

vitamin B12

Folatecycle

Methioninesalvagepathway

N-formylkynurenine

kynurenine

3-hydroxykynurenine

3-hydroxyanthranilate

2-amino-3-carboxymuconatesemialdehyde

2-aminomuconatesemialdehyde

2-aminomuconate

tryptophan

alanine

xanthurenate(yellow)

NAD+ andNADP+

synthesis

NH4+

formate

a-ketoadipate

carbamoylphosphatesynthetase I

–CH3

methyl

SAM

Medical Biochemistry at a Glance

Companion website

This book is accompanied by a companion website which contains interactive Multiple-Choice Questions:

www.ataglanceseries.com/medicalbiochemistry

Medical Biochemistry at a GlanceDr J. G. SalwaySchool of Biomedical and Molecular SciencesUniversity of SurreyGuildfordSurrey, UK

Third edition

A John Wiley & Sons, Ltd., Publication

This edition first published 2012 © 2012 by John Wiley & Sons, Ltd.

Wiley-Blackwell is an imprint of John Wiley & Sons, formed by the merger of Wiley’s global Scientific, Technical and Medical business with Blackwell Publishing.

Registered office: John Wiley & Sons, Ltd, The Atrium, Southern Gate, Chichester, West Sussex, PO19 8SQ, UK

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The right of the author to be identified as the author of this work has been asserted in accordance with the UK Copyright, Designs and Patents Act 1988.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, except as permitted by the UK Copyright, Designs and Patents Act 1988, without the prior permission of the publisher.

First edition published 1996Second edition published 2006Second edition translations:Chinese Translation 2007 Taiwan Yi Hsien Publishing Co. LtdJapanese Translation 2007 Medical Sciences International Ltd, TokyoKorean Translation 2007 E*PUBLIC KOREA Co. LtdPolish Translation 2009 Górnicki Wydawnictwo Medyczne

Designations used by companies to distinguish their products are often claimed as trademarks. All brand names and product names used in this book are trade names, service marks, trademarks or registered trademarks of their respective owners. The publisher is not associated with any product or vendor mentioned in this book. This publication is designed to provide accurate and authoritative information in regard to the subject matter covered. It is sold on the understanding that the publisher is not engaged in rendering professional services. If professional advice or other expert assistance is required, the services of a competent professional should be sought.

The contents of this work are intended to further general scientific research, understanding, and discussion only and are not intended and should not be relied upon as recommending or promoting a specific method, diagnosis, or treatment by physicians for any particular patient. The publisher and the author make no representations or warranties with respect to the accuracy or completeness of the contents of this work and specifically disclaim all warranties, including without limitation any implied warranties of fitness for a particular purpose. In view of ongoing research, equipment modifications, changes in governmental regulations, and the constant flow of information relating to the use of medicines, equipment, and devices, the reader is urged to review and evaluate the information provided in the package insert or instructions for each medicine, equipment, or device for, among other things, any changes in the instructions or indication of usage and for added warnings and precautions. Readers should consult with a specialist where appropriate. The fact that an organization or Website is referred to in this work as a citation and/or a potential source of further information does not mean that the author or the publisher endorses the information the organization or Website may provide or recommendations it may make. Further, readers should be aware that Internet Websites listed in this work may have changed or disappeared between when this work was written and when it is read. No warranty may be created or extended by any promotional statements for this work. Neither the publisher nor the author shall be liable for any damages arising herefrom.

Library of Congress Cataloging-in-Publication DataSalway, J. G. Medical biochemistry at a glance. – 3rd ed. / J.G. Salway. p. ; cm. – (At a glance) Includes bibliographical references and index. ISBN-13: 978-0-470-65451-4 (pbk. : alk. paper) ISBN-10: 0-470-65451-1 (pbk. : alk. paper) 1. Biochemistry–Outlines, syllabi, etc. 2. Clinical biochemistry–Outlines, syllabi, etc. I. Title. II. Series: At a glance series (Oxford, England) [DNLM: 1. Biochemical Phenomena. QU 34] QP514.2.G76 2012 612'.015–dc23 2011024248

A catalogue record for this book is available from the British Library.

Set in 9 on 11.5 pt Times by Toppan Best-set Premedia Limited

1 2012

Contents  5

Contents

32 RegulationofglycolysisandKrebscycle 7233 OxidationoffattyacidstoproduceATPinmuscleandketone

bodiesinliver 7434 Regulationoflipolysis,β-oxidation,ketogenesisand

gluconeogenesis 76

Part 6 Lipids and lipid metabolism35 Structureoflipids 7836 PhospholipidsI:phospholipidsandsphingolipids 8037 PhospholipidsII:micelles,liposomes,lipoproteinsand

membranes 8238 Metabolismofcarbohydratetocholesterol 8439 VLDLandLDLmetabolismI:“forward”cholesterol

transport 8640 VLDLandLDLmetabolismII:endogenoustriacylglycerol

transport 8841 HDLmetabolism:“reverse”cholesteroltransport 9042 Absorptionanddisposalofdietarytriacylglycerolsand

cholesterolbychylomicrons 9243 Steroidhormones:aldosterone,cortisol,androgensand

oestrogens 94

Part 7 Metabolism of amino acids and porphyrins44 Ureacycleandoverviewofaminoacidcatabolism 9645 Non-essentialandessentialaminoacids 9846 Aminoacidmetabolism:toenergyasATP;toglucoseand

ketonebodies 10047 Aminoaciddisorders:maplesyrupurinedisease,

homocystinuria,cystinuria,alkaptonuriaandalbinism 10248 Phenylalanineandtyrosinemetabolisminhealthand

disease 10449 Productsoftryptophanandhistidinemetabolism 10650 Haem,bilirubinandporphyria 108

Part 8 Vitamins51 Fat-solublevitaminsI:vitaminsAandD 11052 Fat-solublevitaminsII:vitaminsEandK 11253 Water-solublevitaminsI:thiamin,riboflavin,niacinand

pantothenate 11454 Water-solublevitaminsII:pyridoxalphosphate(B6) 11655 Water-solublevitaminsIII:folateandvitaminB12 11856 Water-solublevitaminsIV:biotinandvitaminC 120

Part 9 Molecular biology57 Thecellcycle 12258 Pyrimidinemetabolism 12459 Purinemetabolism 12660 StructureofDNA 12861 The“centraldogma”ofmolecularbiology 13062 OrganisationofDNAinchromosomes 13263 ReplicationofDNA(part1) 13464 ReplicationofDNA(part2) 13665 DNAdamageandrepair 13866 TranscriptionofDNAtomakemessengerRNA(part1) 14067 TranscriptionofDNAtomakemessengerRNA(part2) 142

Prefacetothethirdedition 7Acknowledgementstothethirdedition 7Figurekey 8SI/massunitconversions 9

Part 1 Acids, bases and pH 1 Acids,basesandhydrogenions(protons) 10 2 UnderstandingpH 12 3 Productionandremovalofprotonsintoandfrom

theblood 14 4 Metabolicalkalosisandmetabolicacidosis 16 5 Respiratoryalkalosisandrespiratoryacidosis 18

Part 2 Structure of amino acids and proteins 6 Aminoacidsandtheprimarystructureofproteins 20 7 Secondarystructureofproteins 22 8 Tertiaryandquaternarystructureandcollagen 24

Part 3 Formation of ATP: oxidation and reduction reactions

9 Oxidation/reductionreactions,coenzymesandprostheticgroups 26

10 AnaerobicproductionofATPbysubstrate-levelphosphorylation,fromphosphocreatineandbytheadenylatekinase(myokinase)reaction 28

11 AerobicproductionofATP 3012 BiosynthesisofATPbyoxidativephosphorylationI 3213 BiosynthesisofATPbyoxidativephosphorylationII 3414 Whathappenswhenprotonsorelectronsleakfromthe

respiratorychain? 3615 Freeradicals,reactiveoxygenspeciesandoxidativedamage 3816 AerobicoxidationofglucosetoprovideenergyasATP 4017 AnaerobicoxidationofglucosebyglycolysistoformATPand

lactate 4218 Anaerobicglycolysisinredbloodcells,2,3-BPG(2,3-DPG)and

theBohreffect 44

Part 4 Carbohydrates19 Carbohydrates 4620 Absorptionofcarbohydratesandmetabolismofgalactose 4821 Fateofglucoseinliver:glycogenesisandlipogenesis 5022 Fructosemetabolism 5223 Glucosehomeostasis 5424 Glucose-stimulatedsecretionofinsulinfromβ-cells 5625 Regulationofglycogenmetabolism 5826 Glycogenbreakdown(glycogenolysis)andglycogenstorage

diseases 6027 Insulinsignaltransductionanddiabetesmellitus 6228 Diabetesmellitus 6429 Alcoholmetabolism:hypoglycaemia,hyperlactataemiaand

steatosis 66

Part 5 Enzymes and regulation of pathways30 Enzymes:nomenclature,kineticsandinhibitors 6831 Regulationofenzymeactivity 70

6  Contents

68 TranscriptionofDNAtomaketransferRNA 14469 TranscriptionofDNAtomakeribosomalRNA 14670 Translationandproteinsynthesis 14871 ComparisonofDNAreplication,DNAtranscriptionandprotein

synthesisineukaryotesandprokaryotes 150

Part 10 Diagnostic clinical biochemistry72 Diagnosticclinicalbiochemistry(withDrJ.W.WrightFRCP,

MRCPath) 152

Index 154

Companion website

ThisbookisaccompaniedbyacompanionwebsitewhichcontainsinteractiveMultiple-ChoiceQuestions:

www.ataglanceseries.com/medicalbiochemistry

Preface to the third edition

The subject matter in Medical Biochemistry at a Glance is selected from the biochemistry content of First Aid for the USMLE Step 1 : the most popular guide used by students preparing for examinations. As such, it is written for medical students, but is equally accessible to students of the biomedical sciences such as biochemists, medical labo-ratory scientists, veterinary scientists, dentists, pharmacologists, phys-iologists, physiotherapists, nutritionists, food scientists, nurses, medical physicists, microbiologists and students of sports science. This book aspires to present medical biochemistry in the concise two - page format of the “ At a Glance ” series.

Students who study biochemistry as a subsidiary part of their course are frequently overwhelmed by the complexity and huge amount of detail involved. Lecturers will be familiar with the anxious expression of students as they complain “ How much of this do we need to know? ” or “ Do we need to memorise all the structural formulae and the chemi-cal reactions? ” In fairness, biochemistry is a complex and heavily detailed subject. Students should have two objectives: (i) to study and understand biochemical concepts and reactions but not necessarily memorise the structural details, (ii) to prepare for examinations by

determining the amount of detail required by intelligent perusal of lecture notes and past examination papers.

Medical Biochemistry at a Glance is written with these two objec-tives in mind. Judicious study of the back inside cover featuring a metabolic chart including formulae and the enzymes catalysing the reactions plus the comprehensive chart on the front inside cover will enable an understanding of metabolic biochemistry. The enzymes which regulate metabolic pathways are indicated in both charts and throughout the book. In the text of the book, complex detail is subju-gated to a faint background so as to emphasise the most important aspects of the topic. However, students must familiarise themselves with the requirements of their particular examination board to deter-mine how much should be trusted to memory.

Finally, the inspiration for Medical Biochemistry at a Glance has developed from my book Metabolism at a Glance . The latter is a more advanced book but the similarity of style between these two books facilitates progression to a higher level by students specialising in metabolism and disorders of metabolism.

Preface and acknowledgements 7

Acknowledgements to the third edition

Following discussion with my editor, it was clear this new, third edition must include a section on “Molecular Biology”: not my strong-est subject. So the start of this book was marked by a four-day trip to Cheshire visiting my friends Dr Peter Barth and his wife Jane. Peter has dedicated his career to molecular biology and so I was most for-tunate when he offered to update me in this fascinating subject. Jane provided excellent food and warm hospitality in their beautiful house. Peter’s patient, clear and authoritative tuition defined the structure of the chapters. We also made time for recreation, and together they gave me a most enjoyable, productive and unforgettable visit. Peter’s support, advice and encouragement continued through to the last moments of the final proofs. This book would not have been possible without Peter’s invaluable help.

Once again I have been very fortunate to work with Elaine Leggett of Oxford Designers & Illustrators and the facilities provided by Mr Richard Corfield and his team. Elaine’s first task was to update the artwork colour scheme from the second edition to full colour. Then, with her customary aplomb and talent she rose to the challenge of interpreting my sketches for the new Molecular Biology section.

At a Christmas drinks party, I met my old colleague Professor Peter Goldfarb. Inspired with Yuletide spirit, he offered help and generously gave his time, wise advice with characteristic attention to detail and constructive criticism.

I am very grateful to readers who have emailed to report errors and to friends and colleagues for expert advice, especially Dr Kimberly Dawdy, Dr Lucy Elphick, Dr Anna Gloyn, Professor Keith Frayn, Mrs

Rosemary James, Professor Gary John, Professor George Kass, Dr Lisa Meira, and Dr Helen Stokes.

Also, I wish again to record my gratitude to those who contributed to the second edition of this book, namely: Professor Loranne Agius, Dr Wynne Aherne, Dr Beatrice Evans, Dr Martyn Egerton, Professor George Elder, Dr Janet Brown, Dr Geoffrey Gibbons, Dr Barry Gould, Dr Bruce Griffin, Professor Stephen Halloran, Professor Chris O’Callaghan, Dr Anna Saada, and Mrs Marie Skerry.

Many reviewers commented on the excellent index compiled by Philip Aslett for the second edition, so I was very pleased when he agreed to help once more.

My editor Martin Davies has been exceptionally supportive. He has replied to my emails with extraordinary promptness and provided every facility requested to ensure efficient completion of the work. Also, it has been a great pleasure to work with other members of a most pro-fessional Wiley-Blackwell team, especially Heather Addison, Lesley Aslett, Helen Harvey, Karen Moore, Laura Murphy, and Beth Norton.

Regrettably, omissions and errors will have occurred and I would be most grateful to have these drawn to my attention.

Finally, I am grateful to my wife Nicky once again for her support, and for tolerating the intrusion of publication deadlines into our social programme; also the accumulation of documents and papers associ-ated with writing this book.

J. G. SalwaySurrey, UK

[email protected]

8  Figure key

Figure key

Disease or poison

Explanation of the cartoon icons

Therapeutic drug

RC C

R R

cyclic AMP

active proteinkinase A

R

inactive protein kinase A

cyclic AMP

–CH3

methyl

SAM

p85P

PDK-1

PAKT

1 2

P

GSK-3

P

αα

P P

active insulin

receptorβ β

-S-S- -S-S--S-S-

IRS-1

P P

PP

Associated with diagnostic blood test

Excretion in urine or faeces. Product may be used in diagnosis

SAM(s-adenosylmethionine) The methyl-donor man

Regulatory enzyme

Fed state or dietary intake

Fasting state, starvation

Pathway operates in cardiac muscle

Pathway operates in skeletal muscle

Pathway operates in liver

Pathway operates in kidney

A hydrophobic group

A hydrophilic group

PKA (protein kinase A) is activated by cyclic AMP which binds to and removes the regulatory (inhibiting) subunits

Insulin receptor is activated by autophosphorylation of the β-subunits when insulin binds to the α-subunits

IRS-1 (insulin receptor substrate-1)

P85. 85 kDa protein is regulatory subunit of PI-3 kinase. Links IRS-1 to PI-3 kinase

AKT (previously known as PKB). A serine/threonine protein kinase. Binds to PIP3

PDK-1. Phosphoinositide- dependent kinase-1 is activated by phosphatidylinositol 3,4,5-trisphosphate

Glycogen synthase kinase -3. Constitutively active in fasting state. Is inhibited when phosphorylated by AKT

Protein phosphatase-1. Activated by insulin-generated signals

PI-3 kinase. Phosphorylates the 3-hydroxyl group of PIP2 to form phosphatidylinositol 3,4,5-trisphosphate

Currently the subject of research, debate or clinical trials

SI/mass unit conversions  9

SI/mass unit conversions

µmol/l mg/dl< 1.2 2.0–2.5 60–120 < 6.0 < 1108–10

mg/dl0.6–1.3mg/dl mg/dl

< 20

160

140

916

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

8

7

6

5

4

3

2

1

0

8

7

6

5

4

3

2

1

0

1

3

4

5

6

7

8

9

10

9

8

7

6

5

4

3

2

1

0

120

100

80

60

40

20

0

0

20.5

1.0

1.5

2.0

2.5

3.0

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0806.0

5.5

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

70

60

50

40

30

20

10

0

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0 800

600

10

15

20

25

30

40

50

60

708090100

130

160

200

550

500

450

400

350

300

250

200

150

100

50

0

350 45

40

35

30

25

20

15

10

5

300

250

200

150

100

50

0

300

250

200

150

100

50

0

2

4

6

8

10

12

14

16

0 0 0

35 8.0

7.9

7.8

7.7

7.6

7.5

7.4

7.3

7.2

7.1

7.0

6.9

6.8

6.7

30

25

20

15

10

5

0

700

600

500

400

300

200

100

0

(¥ 17.1) (¥ 0.25)

Total bilirubin Calcium Creatinine Glucose [H+]

PhosphatePhosphorus

Thyroxine (T4) Triglycerides Urea BUN Total cholesterol

(∏ 17.1) (∏ 0.25)

(¥ 88.4) (¥ 0.056)

(∏ 88.4) (∏ 0.056)mmol/l

mmol/l mmol/l mmol/lρmol/l

µmol/l mmol/l

mg/dl1.9–3.9 7–25 < 1.5

target target3–7 8–200.5–2.0

ng/dl< 133mg/dl mg/dl

0.6–1.25(¥ 0.323) (¥ 12.87)

(∏ 0.323) (∏ 12.87)

(¥ 0.0113) (¥ 0.357)

(∏ 0.0113) (∏ 0.357) mmol/l< 4.0target target

< 155mg/dl

(¥ 0.0259)

(∏ 0.0259)

nmol/l

nmol/lpH = –log10 [H+] in moles

e.g. 100nmol/l

e.g. antilog10 of –7.4 = 0.000000040 mol/l= 40 nmol/l

= –log10 0.000000 = pH 7.0

nmol/lmol/l

(pH 7.35–7.45) (35–45 nmol/l)


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