Solid Phase ExtractionAmino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsSequence AlignmentBase SequenceMolecular Sequence DataEscherichia coliAcyl Coenzyme AAmino Acid MotifsBinding SitesMutationKineticsMutagenesis, Site-DirectedModels, MolecularDNA, ComplementaryStructure-Activity RelationshipSubstrate SpecificityRecombinant ProteinsProtein ConformationPeptide FragmentsSequence Homology, Nucleic AcidAmino Acids, AromaticProtein Structure, TertiaryAmino Acids, Branched-ChainProtein BindingLeucineAmino Acids, SulfurPeptidesAcylationBacterial ProteinsMolecular WeightDNACell LineRestriction MappingPhylogeny