Protein ConformationAmino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionMolecular ConformationCloning, MolecularBinding SitesMolecular Sequence DataProtein Structure, SecondaryProtein Structure, TertiaryProtein BindingMutationAmino Acids, EssentialEscherichia coliKineticsSequence AlignmentStructure-Activity RelationshipAmino Acid Transport SystemsAmino Acid MotifsMutagenesis, Site-DirectedCrystallography, X-RayCircular DichroismRecombinant ProteinsPeptide FragmentsPeptidesMagnetic Resonance SpectroscopyDNABase SequenceSubstrate SpecificityBacterial ProteinsDNA, ComplementaryAmino Acids, AromaticProtein FoldingProteinsSequence Homology, Nucleic AcidLeucineThermodynamicsAmino Acids, Branched-ChainCell LineMolecular WeightAmino Acids, SulfurAlanineModels, MolecularElectrophoresis, Polyacrylamide GelRecombinant Fusion ProteinsHydrogen BondingCattleRestriction MappingPlasmidsConserved SequenceTemperatureTryptophanLysineSolutionsTrypsinSequence Analysis, DNAHydrogen-Ion ConcentrationModels, ChemicalDNA PrimersCarrier ProteinsPoint MutationPhylogenyLigandsCysteineMolecular StructureGenes, BacterialNuclear Magnetic Resonance, BiomolecularProlineRNA, MessengerChromatography, High Pressure LiquidGlycineMacromolecular SubstancesCatalytic DomainIsoleucineDimerizationSpecies SpecificityCatalysisMutagenesisSpectrometry, FluorescencePolymerase Chain ReactionHydrolysisCodonSaccharomyces cerevisiaeAmino Acid Transport Systems, BasicArginineProtein DenaturationBiological TransportProtein Structure, QuaternaryAmino Acids, BasicPhenylalanineSequence DeletionAspartic AcidPolymorphism, Single-Stranded ConformationalMembrane ProteinsValineEpitopesGlutamineCyanogen BromideTransfection