LeucineAmino AcidsLeucine ZippersSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsMolecular Sequence DataBase SequenceAmino Acids, Branched-ChainSequence AlignmentMutationEscherichia coliAmino Acid MotifsIsoleucineBinding SitesMutagenesis, Site-DirectedKineticsLeucyl AminopeptidaseDNA, ComplementaryAmino Acids, AromaticProtein ConformationRecombinant ProteinsSequence Homology, Nucleic AcidModels, MolecularKeto AcidsPeptide FragmentsValineStructure-Activity RelationshipProtein Structure, TertiaryAmino Acids, SulfurProtein BindingDNAPeptidesSubstrate SpecificityBacterial ProteinsAlanineMolecular WeightProteinsCell LinePhenylalanineRecombinant Fusion ProteinsRestriction MappingProtein BiosynthesisElectrophoresis, Polyacrylamide GelLysineRNA, MessengerProtein Structure, SecondaryPhylogenyPlasmidsGenes, BacterialSequence Analysis, DNAGlutamine