Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularEscherichia coliMolecular Sequence DataMutagenesis, Site-DirectedMutationMutant ProteinsSequence AlignmentBase SequenceAmino Acids, EssentialBinding SitesBacterial ProteinsAmino Acid Transport SystemsKineticsAmino Acid MotifsModels, MolecularCell LineProtein BindingProtein Structure, TertiaryProtein ConformationGenetic Complementation TestStructure-Activity RelationshipDNA, ComplementaryGenes, BacterialPhenotypePlasmidsRecombinant Fusion ProteinsPeptide FragmentsLeucineRestriction MappingSubstrate SpecificityAmino Acids, AromaticDNAPoint MutationAmino Acids, Branched-ChainDNA PrimersSequence Homology, Nucleic AcidPeptidesAmino Acids, SulfurSequence Analysis, DNARNA, MessengerAlanineMolecular WeightSequence DeletionRecombinant ProteinsMice, Mutant StrainsCarrier ProteinsElectrophoresis, Polyacrylamide GelProtein Structure, SecondaryTransfectionTemperatureGenesProteinsConserved SequenceTranscription, GeneticMembrane ProteinsPhylogenyLysineBiological TransportMutagenesis, InsertionalGene DeletionSpecies SpecificityIsoleucineDNA, BacterialDNA-Binding ProteinsFungal ProteinsCysteinePolymerase Chain ReactionTranscription FactorsGene Expression Regulation, BacterialCodonOpen Reading FramesAspartic AcidViral ProteinsGlycineChromosome MappingEscherichia coli ProteinsProtein BiosynthesisArginineCricetinaeChromatography, High Pressure LiquidGene ExpressionAmino Acid Transport Systems, BasicMutation, MissenseSaccharomyces cerevisiae ProteinsGlutaminePlant ProteinsCell MembraneAmino Acids, BasicCattleCOS CellsValineProlineDNA Mutational AnalysisPhenylalanineMethionineArabidopsis