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Journal of Bacteriology, October 2000, p. 5615-5619, Vol. 182, No. 19
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

The Synechococcus Strain PCC 7942 glnN Product (Glutamine Synthetase III) Helps Recovery from Prolonged Nitrogen Chlorosis

Jörg Sauer,1 Ulrike Dirmeier,2 and Karl Forchhammer1,*

Institut für Mikrobiologie und Molekularbiologie der Justus-Liebig-Universität Giessen, D-35392 Giessen,1 and Lehrstuhl für Mikrobiologie der Ludwig-Maximilians-Universität München, D-80638 Munich,2 Germany

Received 14 April 2000/Accepted 6 July 2000

We report the cloning and sequencing of the glnN gene encoding a class III glutamine synthetase from the cyanobacterium Synechococcus strain PCC 7942. Mapping of the transcriptional start site revealed a DNA sequence in the promoter region that resembles an imperfect NtcA binding motif. Expression of glnN is impaired in NtcA- and PII-deficient mutants. The only parameter which was negatively affected in the glnN mutant compared to the wild type was the recovery rate of prolonged nitrogen-starved cells with low concentrations of combined nitrogen.

* Corresponding author. Mailing address: Institut für Mikrobiologie und Molekularbiologie der Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 26-32, D-35392 Giessen, Germany. Phone: (49) 641-9935545. Fax: (49) 641-9935549. E-mail: Karl.Forchhammer{at}mikro.bio.uni-giessen.de.

Journal of Bacteriology, October 2000, p. 5615-5619, Vol. 182, No. 19
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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