Lewis AcidsCatalysisHydrolysisKineticsHydrogen-Ion ConcentrationAmino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularBinding SitesSubstrate SpecificityModels, MolecularMolecular Sequence DataEscherichia coliMutagenesis, Site-DirectedProtein ConformationBase SequenceSequence AlignmentMutationAmino Acids, EssentialRecombinant ProteinsAmino Acid Transport SystemsAmino Acid MotifsProtein BindingStructure-Activity RelationshipProtein Structure, TertiaryCatalytic DomainAdenosine TriphosphateBacterial ProteinsBiocatalysisCrystallography, X-RayPeptide FragmentsDNA, ComplementaryMolecular WeightDNAChromatography, High Pressure LiquidAmino Acids, AromaticSequence Homology, Nucleic AcidPeptidesProtein Structure, SecondaryLeucineElectrophoresis, Polyacrylamide GelAmino Acids, Branched-ChainAlanineLysineConserved SequenceAmino Acids, SulfurCattleModels, ChemicalCell LineAspartic AcidMolecular StructureProteinsStereoisomerismRecombinant Fusion ProteinsPlasmidsRestriction MappingDNA PrimersAdenosine TriphosphatasesPhylogenyCysteineGenes, BacterialTrypsinArginineSequence Analysis, DNASaccharomyces cerevisiaeEnzyme StabilityTemperatureHistidineGlycineGlutamineRNA, MessengerSpecies SpecificityCarrier ProteinsBiological TransportMagnetic Resonance SpectroscopyOxidation-ReductionMutagenesisIsoleucineEscherichia coli ProteinsChromatography, GelPoint MutationTryptophanGuanosine TriphosphateMacromolecular SubstancesAmino Acid Transport Systems, BasicPhenylalanineRabbitsMagnesiumChromatography, Ion ExchangeEstersProton-Translocating ATPasesLiverCodonCell MembraneThermodynamicsMethionineAmino Acids, BasicEndopeptidases