Archives of Microbiology

, Volume 120, Issue 3, pp 263–270 | Cite as

Regulation of ammonium uptake and metabolism by nitrogen fixing bacteria. III. Clostridium pasteurianum

  • D. Kleiner
Article

Abstract

Addition of ammonium salts to N2 fixing continuous cultures of Clostridium pasteurianum caused immediate stop of nitrogenase synthesis, while the levels of glutamine synthetase, glutamate dehydrogenase and asparagine synthetase remained constant. No evidence for an interconversion of the glutamine synthetase was found. The activities of glutamate synthase in crude extracts were inversely related to the nitrogenase levels. The intracellular glutamine pool rapidly expanded during nitrogenase repression and decreased as fast during derepression while the pool sizes of all other amino acids were not strongly related to the rate of nitrogenase formation. These investigations suggest glutamine as corepressor of nitrogenase synthesis.

Key words

Enzyme regulation Ammonium metabolism Nitrogenase Glutamine synthetase Glutamate synthase Glutamate dehydrogenase Asparagine synthetase Amino acid pools Clostridium pasteurianum 

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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • D. Kleiner
    • 1
  1. 1.Lehrstuhl Biochemie am Chemischen Laboratorium der UniversitätFreiburg i. Br.Federal Republic of Germany

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