N2 fixation and NH
4
+
assimilation in the thermophilic anaerobes Clostridium thermosaccharolyticum and Clostridium thermoautotrophicum |
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Authors: | Michael Bogdahn Diethelm Kleiner |
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Institution: | (1) Lehrstuhl für Mikrobiologie, Universität Bayreuth, Postfach 3008, D-8580 Bayreuth, Germany |
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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 NH
4
+
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 NH
4
+
-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 NH
4
+
-dependent asparagine synthetase.Abbreviation GOGAT
glutamine-oxoglutarate amidotransferase amidotransferase (glutamate synthase) |
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Keywords: | Clostridium thermosaccharolyticum Clostridium thermoautotrophicum Thermophilic nitrogenase Ammonium assimilation Nitrogen control |
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