CyclamatesSulfuric AcidsAcidsHydrochloric AcidHydrogen-Ion ConcentrationAmino AcidsSequence Homology, Amino AcidAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsAmino Acid MotifsSequence AlignmentBase SequenceEscherichia coliMutationBinding SitesMolecular Sequence DataAmino Acids, AromaticMutagenesis, Site-DirectedAmino Acids, SulfurDNA, ComplementarySequence Homology, Nucleic AcidPeptide FragmentsKineticsProtein ConformationRecombinant ProteinsLeucineModels, MolecularStructure-Activity RelationshipProtein Structure, TertiarySubstrate SpecificityProtein BindingDNAPeptidesMolecular WeightBacterial ProteinsAmino Acid SequenceRestriction MappingCell LineRecombinant Fusion ProteinsAlaninePhylogenyGenes, BacterialProteinsSequence Analysis, DNAElectrophoresis, Polyacrylamide Gel