Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsMolecular Sequence DataSequence AlignmentEscherichia coliBinding SitesProtein ConformationBase SequenceModels, MolecularKineticsAmino Acid MotifsMutationMutagenesis, Site-DirectedRecombinant ProteinsProtein Structure, TertiaryProtein BindingPeptide FragmentsMolecular WeightDNA, ComplementaryDimerizationStructure-Activity RelationshipSequence Homology, Nucleic AcidAmino Acids, AromaticBacterial ProteinsSubstrate SpecificityAmino Acids, Branched-ChainLeucineProtein Structure, SecondaryDNAAmino Acids, SulfurElectrophoresis, Polyacrylamide GelPeptidesMacromolecular SubstancesCell LineRecombinant Fusion ProteinsRestriction MappingProteinsPlasmidsPhylogenyAlanineGenes, BacterialChromatography, High Pressure LiquidSequence Analysis, DNAChromatography, GelConserved SequenceCattleRNA, MessengerLysineDNA PrimersCarrier ProteinsSpecies SpecificityAmino Acid Transport Systems, BasicIsoleucineTrypsinCrystallography, X-RayProtein MultimerizationAmino Acids, BasicCysteineCyanogen BromideGlycineCircular DichroismBiological TransportCodonProtein Structure, QuaternarySaccharomyces cerevisiaeProtein FoldingGlutamineMutagenesisProtein BiosynthesisArginineGenesOpen Reading FramesSequence DeletionTemperatureMethionineValineAspartic AcidSequence AnalysisPoint MutationAmino Acids, DiaminoMembrane ProteinsTryptophanPolymerase Chain ReactionRabbitsHydrogen-Ion ConcentrationProlineHydrolysisGene LibraryTransfectionExcitatory Amino AcidsCatalysisPhenylalanineNitrogenTranscription, GeneticDNA, Bacterial