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The role of glutamine synthetase in the regulation of nitrogenase activity (“switch off” effect) inRhodospirillum rubrum

✍ Scribed by Gunnar Falk; Bo C. Johansson; Stefan Nordlund

Publisher
Springer
Year
1982
Tongue
English
Weight
298 KB
Volume
132
Category
Article
ISSN
0302-8933

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✦ Synopsis

We have studied the changes in the activities of both nitrogenase ("switch off") and glutamine synthetase in Rhodospirillum rubrum upon addition of ammonium ions or glutamine to nitrogen fixing cultures. Both activities decrease drastically and return in a parallel manner when added ammonia is metabolized. The decrease in glutamine synthetase activity does not seem to be primarily due to adenylylation of the enzyme. Addition of glutamine to cells starved for nitrogen results in inactivation of glutamine synthetase but nitrogenase is only partially switched off.

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