Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceCloning, MolecularAmino Acid SubstitutionMolecular Sequence DataBase SequenceMutationEscherichia coliSequence AlignmentAmino Acids, EssentialAmino Acid Transport SystemsKineticsBacterial ProteinsBinding SitesAmino Acid MotifsGenes, BacterialRecombinant ProteinsDNA, ComplementaryBiosynthetic PathwaysSubstrate SpecificityMutagenesis, Site-DirectedModels, MolecularLeucineSequence Homology, Nucleic AcidProtein ConformationAmino Acids, AromaticProtein Structure, TertiaryPeptide FragmentsPhylogenyMolecular WeightSequence Analysis, DNAProtein BindingProtein BiosynthesisStreptomycesStructure-Activity RelationshipAmino Acids, Branched-ChainRNA, MessengerMultigene FamilyChromatography, High Pressure LiquidCell LinePeptidesAmino Acids, SulfurDNARestriction MappingElectrophoresis, Polyacrylamide GelPlasmidsGenetic Complementation TestRecombinant Fusion ProteinsPlant ProteinsDNA PrimersIsoleucineMethionineLysineSpecies SpecificityAlanineOpen Reading FramesProteinsSaccharomyces cerevisiaeTranscription, GeneticConserved SequenceMolecular StructureProtein Structure, SecondaryBiological TransportCarrier ProteinsCattleGene Expression Regulation, BacterialArginineDNA, BacterialGlycineAmino Acid Transport Systems, BasicMembrane ProteinsAmino Acids, DiaminoGenesGene Expression Regulation, PlantGene ExpressionCarbon IsotopesMutagenesisValinePolymerase Chain ReactionLiverCysteineProlineGene LibraryTryptophanCatalysisCodonOxidoreductasesTrypsinPhenylalanineCells, CulturedGlutaminePeptide SynthasesArabidopsisAmino Acids, BasicBlotting, NorthernTransfectionSequence DeletionMagnetic Resonance SpectroscopyProtein Processing, Post-Translational