Edited by Andrew B. Hughes Amino Acids, Peptides and Proteins in Organic Chemistry Further Reading Pignataro, B.(ed.) Fessner,W.-D.,Anthonsen, T. Ideas in Chemistry and Modern Biocatalysis Molecular Sciences StereoselectiveandEnvironmentally FriendlyReactions AdvancesinSyntheticChemistry 2009 2010 ISBN:978-3-527-32071-4 ISBN:978-3-527-32539-9 Lutz, S., Bornscheuer,U. T. (eds.) Tulla-Puche, Judit /Albericio, Protein Engineering Handbook Fernando (eds.) ThePowerofFunctionalResins 2VolumeSet 2009 in Organic Synthesis ISBN:978-3-527-31850-6 2008 ISBN:978-3-527-31936-7 Castanho, Miguel/Santos, Nuno(eds.) Peptide Drug Discovery and Eicher, T., Hauptmann,S., Speicher, A. Development The Chemistry of Heterocycles TranslationalResearchinAcademia Structure,Reactions,Synthesis,and andIndustry Applications 2011 2011 ISBN:978-3-527-32891-8 ISBN:978-3-527-32868-0(Hardcover) ISBN:978-3-527-32747-8(Softcover) Sewald, N., Jakubke,H.-D. Royer,J. (ed.) Peptides: Chemistry and Biology Asymmetric Synthesis of Nitrogen Heterocycles 2009 ISBN:978-3-527-31867-4 2009 ISBN:978-3-527-32036-3 JNicolaou,K. C.,Chen,J. S. Drauz, K.,Gröger,H., May,O. (eds.) Classics in Total Synthesis III Enzyme Catalysis in Organic NewTargets,Strategies,Methods Synthesis 2011 ISBN:978-3-527-32958-8(Hardcover) Third,CompletelyRevisedand ISBN:978-3-527-32957-1(Softcover) EnlargedEdition 3Volumes 2011 ISBN:978-3-527-32547-4 Edited by Andrew B. Hughes Amino Acids, Peptides and Proteins in Organic Chemistry Volume 5 - Analysis and Function of Amino Acids and Peptides TheEditor AllbookspublishedbyWiley-VCHarecarefully produced.Nevertheless,authors,editors,and AndrewB.Hughes publisherdonotwarranttheinformationcontained LaTrobeUniversity inthesebooks,includingthisbook,tobefreeof DepartmentofChemistry errors.Readersareadvisedtokeepinmindthat Victoria3086 statements,data,illustrations,proceduraldetailsor Australia otheritemsmayinadvertentlybeinaccurate. LibraryofCongressCardNo.: appliedfor BritishLibraryCataloguing-in-PublicationData Acataloguerecordforthisbookisavailablefromthe BritishLibrary. Bibliographicinformationpublishedby theDeutscheNationalbibliothek TheDeutscheNationalbibliothekliststhis publicationintheDeutscheNationalbibliografie; detailedbibliographicdataareavailableonthe Internetathttp://dnb.d-nb.de. #2012Wiley-VCHVerlag&Co.KGaA, Boschstr.12,69469Weinheim,Germany Allrightsreserved(includingthoseoftranslationinto otherlanguages).Nopartofthisbookmaybe reproducedinanyform–byphotoprinting, microfilm,oranyothermeans–nortransmittedor translatedintoamachinelanguagewithoutwritten permissionfromthepublishers.Registerednames, trademarks,etc.usedinthisbook,evenwhennot specificallymarkedassuch,arenottobeconsidered unprotectedbylaw. Composition ThomsonDigital,Noida,India PrintingandBinding betz-druckGmbH,Darmstadt CoverDesign SchulzGrafikDesign,Fußgönheim PrintedintheFederalRepublicofGermany Printedonacid-freepaper PrintISBN:978-3-527-32104-9 ePDFISBN:978-3-527-63185-8 oBookISBN:978-3-527-63184-1 V Contents List of Contributors XV 1 MassSpectrometryofAminoAcidsandProteins 1 SiminD.MalekniaandRichardJohnson 1.1 Introduction 1 1.1.1 MassTerminology 1 1.1.2 ComponentsofaMassSpectrometer 4 1.1.3 ResolutionandMassAccuracy 6 1.1.4 AccurateAnalysisofESIMultiplyChargedIons 10 1.1.5 FragmentIons 11 1.2 BasicProteinChemistryandHowitRelatestoMS 21 1.2.1 MassPropertiesofthePolypeptideChain 21 1.2.2 InVivoProteinModifications 21 1.2.3 ExVivoProteinModifications 26 1.3 SamplePreparationandDataAcquisition 28 1.3.1 Top-DownVersusBottom-UpProteomics 28 1.3.2 ShotgunVersusTargetedProteomics 28 1.3.3 EnzymaticDigestionforBottom-UpProteomics 29 1.3.4 LiquidChromatographyandCapillaryElectrophoresisfor MixturesinBottom-Up 30 1.4 DataAnalysisofLC-MS/MS(orCE-MS/MS)ofMixtures 32 1.4.1 IdentificationofProteinsfromMS/MSSpectraofPeptides 32 1.4.2 DeNovoSequencing 35 1.5 MSofProteinStructure,Folding,andInteractions 36 1.5.1 MethodstoMass-TagStructuralFeatures 37 1.6 ConclusionsandPerspectives 40 References 40 2 X-RayStructureDeterminationofProteinsandPeptides 51 AndrewJ.Fisher 2.1 Introduction 51 2.1.1 LightMicroscopy 51 2.1.2 X-RaysandCrystallographyattheStart 52 VI Contents 2.1.3 X-RayCrystallographyToday 53 2.1.4 LimitationsofX-RayCrystallography 54 2.2 GrowingCrystals 55 2.2.1 WhyCrystals? 55 2.2.2 BasicMethodsofGrowingProteinCrystals 55 2.2.3 ProteinSample 59 2.2.4 PreliminaryCrystalAnalysis 59 2.2.5 MountingCrystalsforX-RayAnalysis 61 2.3 SymmetryandSpaceGroups 62 2.3.1 CrystalsandtheUnitCell 62 2.3.2 PointGroups 65 2.3.3 SpaceGroups 66 2.3.4 AsymmetricUnit 67 2.4 X-RayScatteringandDiffraction 67 2.4.1 X-RaysandMathematicalRepresentationofWaves 67 2.4.2 InteractionofX-RayswithMatter 70 2.4.3 CrystalLattice,MillerIndices,andtheReciprocalSpace 73 2.4.4 X-RayDiffractionfromaCrystal:BraggsLaw 75 2.4.5 BraggsLawinReciprocalSpace 77 2.4.6 FourierTransformEquationfromaLattice 79 2.4.7 FriedelsLawandtheElectronDensityEquation 80 2.5 CollectingandProcessingDiffractionData 82 2.5.1 DataCollectionStrategy 82 2.5.2 SymmetryandScalingData 83 2.6 SolvingtheStructure(DeterminingPhases) 83 2.6.1 MolecularReplacement 83 2.6.2 IsomorphousReplacement 85 2.6.3 MAD 88 2.7 AnalyzingandRefiningtheStructure 90 2.7.1 ElectronDensityInterpretationandModelBuilding 90 2.7.2 ProteinStructureRefinement 91 2.7.3 ProteinStructureValidation 93 References 94 3 NuclearMagneticResonanceofAminoAcids,Peptides, andProteins 97 AndreaBerniniandPierandreaTemussi 3.1 Introduction 97 3.1.1 ActiveNucleiinNMR 98 3.1.2 EnergyLevelsandSpinStates 98 3.1.3 MainNMRParameters(Glossary) 99 3.1.3.1 ChemicalShift 99 3.1.3.2 ScalarCouplingConstants 100 3.1.3.3 NOE 100 3.1.3.4 RDC 101 Contents VII 3.2 AminoAcids 101 3.2.1 HistoricalSignificance 101 3.2.2 AminoAcidsStructure 101 3.2.3 RandomCoilChemicalShift 102 3.2.4 SpinSystems 105 3.2.5 LabileProtons 110 3.2.6 ContemporaryRelevance:Metabolomics 112 3.3 Peptides 113 3.3.1 HistoricalSignificance 113 3.3.2 OligopeptidesasModelsforConformationalTransitions inProteins 114 3.3.3 BioactivePeptides 116 3.3.4 ChoiceoftheSolvent 117 3.3.4.1 TransportFluids 118 3.3.4.2 Membranes 120 3.3.4.3 ReceptorCavities 122 3.3.5 EnsembleCalculations 125 3.3.6 SelectedExamplesfromtheMajorFieldsofBioactivePeptides 125 3.3.6.1 Aspartame 125 3.3.6.2 Opioids 126 3.3.6.3 TransmembraneHelices 127 3.3.6.4 Cyclopeptides 128 3.4 Proteins 129 3.4.1 AnAlternativetooraValidationofDiffractometric Methods? 129 3.4.2 ProteinSpectra 129 3.4.3 WüthrichsProtocol 130 3.4.3.1 SamplePreparation 131 3.4.3.2 RecordingNMRSpectra 131 3.4.3.3 SequentialAssignment 131 3.4.3.4 ConformationalConstraints 132 3.4.3.5 ModelBuilding 134 3.4.4 RecentDevelopments 134 3.4.5 SelectedStructures 136 3.4.5.1 SuperoxideDismutases 137 3.4.5.2 MalateSynthaseG 137 3.4.5.3 Interactions 138 3.5 Conclusions 145 References 146 4 StructureandActivityofN-MethylatedPeptides 155 RaymondS.Norton 4.1 Introduction 155 4.2 ConformationalEffectsofN-Methylation 157 4.3 EffectsofN-MethylationonBioactivePeptides 159 VIII Contents 4.3.1 Thyrotropin-ReleasingHormone 159 4.3.2 CyclicPeptides 159 4.3.3 SomatostatinAnalogs 160 4.3.4 AntimalarialPeptide 161 4.4 ConcludingRemarks 162 References 163 5 High-PerformanceLiquidChromatographyofPeptides andProteins 167 ReinhardI.BoysenandMiltonT.W.Hearn 5.1 Introduction 167 5.2 BasicTermsandConceptsinChromatography 169 5.3 ChemicalStructureofPeptidesandProteins 173 5.3.1 BiophysicalPropertiesofPeptidesandProteins 173 5.3.2 ConformationalPropertiesofPeptidesandProteins 176 5.3.3 OpticalPropertiesofPeptidesandProteins 176 5.4 HPLCSeparationModesinPeptideandProtein Analysis 177 5.4.1 SEC 178 5.4.2 RPC 179 5.4.3 NPC 181 5.4.4 HILIC 181 5.4.5 ANPC 183 5.4.6 HIC 184 5.4.7 IEX 187 5.4.8 AC 188 5.5 MethodDevelopmentfromAnalyticaltoPreparativeScale IllustratedforHP-RPC 189 5.5.1 DevelopmentofanAnalyticalMethod 190 5.5.2 ScalingUptoPreparativeChromatography 196 5.5.3 Fractionation 198 5.5.4 AnalysisoftheQualityoftheFractionation 198 5.6 MultidimensionalHPLC 198 5.6.1 PurificationofPeptidesandProteinsbyMD-HPLC Methods 200 5.6.2 FractionationofComplexPeptideandProteinMixtures byMD-HPLC 202 5.6.3 OperationalStrategiesforMD-HPLCMethods 202 5.6.3.1 Off-lineCouplingModeforMD-HPLCMethods 202 5.6.3.2 On-LineCouplingModeforMD-HPLCMethods 203 5.6.4 DesignofanEffectiveMD-HPLCScheme 203 5.6.4.1 OrthogonalityofChromatographicModes 203 5.6.4.2 CompatibilityMatrixofChromatographicModes 205 5.7 Conclusions 206 References 207 Contents IX 6 LocalSurfacePlasmonResonanceandElectrochemicalBiosensing SystemsforAnalyzingFunctionalPeptides 211 MasatoSaitoandEiichiTamiya 6.1 LocalizedSurfacePlasmonResonance(LSPR)-BasedMicrofluidics BiosensorfortheDetectionofInsulinPeptideHormone 211 6.1.1 LSPRandMicroTotalAnalysisSystems 211 6.1.2 MicrofluidicLSPRChipFabricationandLSPRMeasurement 212 6.1.3 DetectionoftheInsulin–Anti-InsulinAntibodyReaction onaChip 213 6.2 ElectrochemicalLSPR-BasedLabel-FreeDetectionofMelittin 215 6.2.1 MelittinandE-LSPR 215 6.2.2 FabricationofE-LSPRSubstrateandFormationoftheHybrid BilayerMembrane 215 6.2.3 MeasurementsofMembrane-BasedSensorsforPeptideToxin 217 6.3 Label-FreeElectrochemicalMonitoringofb-Amyloid(Ab) PeptideAggregation 218 6.3.1 AlzheimersAbAggregationandElectrochemical DetectionMethod 218 6.3.2 Label-FreeElectrochemicalDetectionofAbAggregation 219 References 221 7 SurfacePlasmonResonanceSpectroscopyintheBiosciences 225 JingYuan,YinqiuWu,andMarie-IsabelAguilar 7.1 Introduction 225 7.2 SPR-BasedOpticalBiosensors 225 7.3 PrincipleofOperationofSPRBiosensors 226 7.4 DescriptionofaSPRInstrument 228 7.4.1 SensorSurface 228 7.4.2 FlowSystem 229 7.4.3 DetectionSystem 230 7.5 ApplicationofSPRinImmunosensorDesign 230 7.5.1 AssayDevelopment 232 7.5.1.1 ImmobilizationoftheAnalytetoaSpecificChipSurface 232 7.5.1.2 AssayDesign 233 7.6 ApplicationofSPRinMembraneInteractions 234 7.6.1 GeneralProtocolsforMembraneInteraction StudiesbySPR 236 7.6.1.1 LiposomePreparation 236 7.6.1.2 FormationofBilayerSystems 236 7.6.1.3 AnalyteBindingtotheMembraneSystem 237 7.6.1.4 MembraneBindingofAntimicrobialPeptidesbySPR 238 7.7 DataAnalysis 240 7.7.1 LinearizationAnalysis 240 7.7.2 NumericalIntegrationAnalysis 241 7.7.3 Steady-StateApproximations 242 X Contents 7.8 Conclusions 243 References 244 8 AtomicForceMicroscopyofProteins 249 AdamMechler 8.1 Foreword 249 8.1.1 ImportanceofAskingtheRightQuestion 250 8.2 AFM 250 8.2.1 PrincipleandBasicModesofOperation 250 8.2.2 HowDoesaTipTap? 251 8.3 BioimagingHighlights 253 8.3.1 ProteinOligomerization,Aggregation,andFibers 253 8.3.2 MembraneBindingandLysis 255 8.3.3 IonChannelActivity 257 8.3.4 Protein–DNA-SpecificBinding 261 8.4 Issues 261 8.4.1 Resolution 262 8.4.2 ImagingForce 263 8.4.3 RepetitiveStress 264 8.4.4 ArtifactsRelatedtotooLowFreeAmplitude 265 8.4.5 TransientForceandBandwidth 266 8.4.6 AccuracyofSurfaceTracking 266 8.4.7 StepArtifacts 268 8.5 ForceMeasurements 269 8.6 LiquidImaging 269 8.7 SamplePreparationforBioimaging 272 8.7.1 Adhesion 272 8.7.2 PhysicalEntrapment 273 8.7.3 ChemicalBinding 274 8.8 Outlook 274 References 275 9 SolventInteractionswithProteinsandOtherMacromolecules 277 SatoshiOhtake,YoshikoKita,KouheiTsumoto,andTsutomuArakawa 9.1 Introduction 277 9.2 SolventApplications 280 9.2.1 Research 280 9.2.2 Precipitation 287 9.2.3 Chromatography 288 9.2.4 ProteinRefolding 296 9.2.5 Formulation 297 9.3 SolventApplicationforViruses 300 9.3.1 IsolationandPurificationofViruses 301 9.3.2 StabilizationandFormulationofViruses 302 9.3.3 InactivationofViruses 309
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