Amino Acid SubstitutionAmino Acid SequenceAmino AcidsMolecular Sequence DataSequence Homology, Amino AcidBase SequenceMutagenesis, Site-DirectedMutationCloning, MolecularBinding SitesModels, MolecularSequence AlignmentEscherichia coliProtein ConformationStructure-Activity RelationshipProtein Structure, TertiaryRecombinant ProteinsKineticsPoint MutationProtein BindingPeptide FragmentsSubstrate SpecificityProtein Structure, SecondaryAmino Acid MotifsBacterial ProteinsDNA, ComplementarySequence Homology, Nucleic AcidCell LineSequence Analysis, DNAPeptidesConserved SequenceDNAPhylogenyMutagenesisPlasmidsRecombinant Fusion ProteinsDNA PrimersRestriction MappingAlanineMutation, MissenseDNA Mutational AnalysisCodonAmino Acids, EssentialEvolution, MolecularLysineAmino Acid Transport SystemsGenes, BacterialCysteinePolymerase Chain ReactionElectrophoresis, Polyacrylamide GelProteinsMolecular WeightLeucineSpecies SpecificityAspartic AcidGenetic VariationCatalysisTrypsinChromatography, High Pressure LiquidGlycineArginineSequence DeletionCyanogen BromideTransfectionCarrier ProteinsCattleSaccharomyces cerevisiaeEnzyme StabilityIsoleucineViral ProteinsCircular DichroismRNA, MessengerProlineHistidineAmino Acids, AromaticEpitopesHydrolysisGenesCricetinaeEscherichia coli ProteinsPhenotypeDNA, BacterialSerineCOS CellsMembrane ProteinsCatalytic DomainTryptophanHydrogen-Ion ConcentrationCrystallography, X-RaySequence AnalysisMacromolecular SubstancesAllelesPhenylalanineSequence Analysis, ProteinValineGene LibraryAsparagineThreonineTemperatureTranscription, Genetic