title: N2 fixation and NH4+ assimilation in the thermophilic anaerobes Clostridium thermosaccharolyticum and Clostridium thermoautotrophicum.
abstract: Inorganic nitrogen metabolism in the obligate anaerobic thermophiles Chlostridium thermosaccharolyticum and Clostridium thermoautotrophicum differs in several respects. C. thermosaccharolyticum contains a nitrogenase as inferred from NH4+ repressible C2H2 reduction, a glutamine synthetase which is partially repressed by ammonium, very labile glutamate synthase activities with both NADH and NADPH, NADPH-dependent glutamate dehydrogenase, and NH4+-dependent asparagine synthetase. C. thermoautotrophicum contains no nitrogenase, but glutamine synthetase, no glutamate synthase, no glutamate dehydrogenase, but a NADH-dependent alanine dehydrogenase and a NH4+-dependent asparagine synthetase.
authors.forename: M
authors.initials: M
authors.lastname: Bogdahn
authors.forename: D
authors.initials: D
authors.lastname: Kleiner
mesh_terms: D050788:Alanine Dehydrogenase; D000594:Amino Acid Oxidoreductases / Q000378:metabolism; D000641:Ammonia / Q000378:metabolism*; D001217:Aspartate-Ammonia Ligase / Q000378:metabolism; D003013:Clostridium / Q000201:enzymology / Q000378:metabolism*; D005969:Glutamate Dehydrogenase / Q000378:metabolism; D005970:Glutamate Synthase / Q000378:metabolism; D005974:Glutamate-Ammonia Ligase / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism; D009586:Nitrogen Fixation; D009591:Nitrogenase / Q000378:metabolism
chemical_list: D000641:Ammonia; D009591:Nitrogenase; D000594:Amino Acid Oxidoreductases; D050788:Alanine Dehydrogenase; D005970:Glutamate Synthase; D005969:Glutamate Dehydrogenase; D001217:Aspartate-Ammonia Ligase; D005974:Glutamate-Ammonia Ligase; D009584:Nitrogen