NitrogenAmino AcidsSequence Homology, Amino AcidNitrogen FixationAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialNitrogen IsotopesAmino Acid Transport SystemsNitrogen CompoundsBlood Urea NitrogenNitrogen CycleNitrogen DioxideSequence AlignmentBase SequenceMutationEscherichia coliMolecular Sequence DataAmino Acid MotifsBinding SitesReactive Nitrogen SpeciesKineticsMutagenesis, Site-DirectedAmino Acids, Branched-ChainBacterial ProteinsSequence Homology, Nucleic AcidLeucineDNA, ComplementaryAmino Acids, AromaticModels, MolecularAmino Acids, SulfurRecombinant ProteinsProtein ConformationPeptide FragmentsStructure-Activity RelationshipGenes, BacterialProtein Structure, TertiarySubstrate SpecificityPhylogenyGlutamineProtein BindingDNAMolecular WeightPeptidesNitrogen OxidesRestriction MappingSequence Analysis, DNAPII Nitrogen Regulatory ProteinsAlanineAmmoniaProteinsCarbonCell LineRecombinant Fusion ProteinsSpecies SpecificityPlasmidsRNA, MessengerElectrophoresis, Polyacrylamide GelLysineCattleNitratesUreaIsoleucineAmino Acid Transport Systems, BasicProtein Structure, SecondaryConserved SequenceChromatography, High Pressure LiquidSaccharomyces cerevisiaeBiological TransportDNA PrimersArginineCarrier ProteinsAmino Acids, BasicQuaternary Ammonium CompoundsGlycineFertilizersMethionineProlineCodonGlutamate-Ammonia LigaseGenesValineOpen Reading FramesDNA, BacterialTranscription, GeneticAspartic Acid