Archives of Microbiology

, Volume 124, Issue 2–3, pp 197–203 | Cite as

The enzymes of the ammonia assimilation in Pseudomonas aeruginosa

  • Dick B. Janssen
  • Huub J. M. op den Camp
  • Pieter J. M. Leenen
  • Chris van der Drift


Glutamine synthetase from Pseudomonas aeruginosa is regulated by repression/derepression of enzyme synthesis and by adenylylation/deadenylylation control. High levels of deadenylylated biosynthetically active glutamine synthetase were observed in cultures growing with limiting amounts of nitrogen while synthesis of the enzyme was repressed and that present was adenylylated in cultures with excess nitrogen.

NADP-and NAD-dependent glutamate dehydrogenase could be separated by column chromatography and showed molecular weights of 110,000 and 220,000, respectively. Synthesis of the NADP-dependent glutamate dehydrogenase is repressed under nitrogen limitation and by growth on glutamate. In contrast, NAD-dependent glutamate dehydrogenase is derepressed by glutamate. Glutamate synthase is repressed by glutamate but not by excess nitrogen.

Key words

Glutamine synthetase Glutamate synthase Glutamate dehydrogenase Ammonia assimilation Pseudomonas aeruginosa 


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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • Dick B. Janssen
    • 1
  • Huub J. M. op den Camp
    • 1
  • Pieter J. M. Leenen
    • 1
  • Chris van der Drift
    • 1
  1. 1.Department of Microbiology, Faculty of ScienceUniversity of NijmegenNijmegenThe Netherlands

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