title: Rhizobium meliloti mutants altered in ammonium utilization.
abstract: Derivatives of Rhizobium meliloti 2011 required trace amounts of glutamate to use ammonium as the nitrogen source for growth, although they could use serine as the sole nitrogen source. Specific activities of ammonium assimilatory enzymes were similar to those in strain Rm2011. The mutants were deficient in nitrogen fixation.
mesh_terms: D000643:Ammonium Chloride / Q000378:metabolism*; D001692:Biological Transport; D005969:Glutamate Dehydrogenase / Q000378:metabolism; D005970:Glutamate Synthase / Q000378:metabolism; D005974:Glutamate-Ammonia Ligase / Q000378:metabolism; D005971:Glutamates / Q000378:metabolism; D018698:Glutamic Acid; D009154:Mutation; D009586:Nitrogen Fixation; D012231:Rhizobium / Q000235:genetics / Q000378:metabolism*
chemical_list: D005971:Glutamates; D000643:Ammonium Chloride; D018698:Glutamic Acid; D005970:Glutamate Synthase; D005969:Glutamate Dehydrogenase; D005974:Glutamate-Ammonia Ligase