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Evidence for a common genetic regulation of glutamine synthetase and nitrate uptake and reductase in the cyanobacterium Anabaena cycadeae

✍ Scribed by Singh, Hriday N. ;Rai, Amar N. ;Bagchi, Suvendra N.

Publisher: Springer
Year: 1985
Tongue: English
Weight: 215 KB
Volume: 198
Category: Article
ISSN: 0026-8925
DOI: 10.1007/bf00383023

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✦ Synopsis

Nitrate uptake and reductase activities of the cyanobacterium Anabaena cycadeae and its mutant, lacking glutamine synthetase, (the glutamine auxotroph) were measured. The levels of both these enzymes were up to 25-fold higher in the mutant than in the parent (Anabaena cycadeae). The data indicate operation of a common genetic regulatory mechanism controlling the loss of the primary ammonia assimilating enzyme, glutamine synthetase, and derepression of the nitrate uptake and reductase systems.

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## Abstract Growth and urea regulation of heterocyst and nitrogenase formation have been studied in the diazotrophic cyanobacterium __Anabaena cycadeae__ and its glutamine auxotrophic mutant strain lacking glutamine synthetase (GS) activity. The parent strain having normal GS activity utilized urea