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Journal of Bacteriology, February 2001, p. 1090-1095, Vol. 183, No. 3
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.3.1090-1095.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Nitrogen-Regulated Group 2 Sigma Factor from Synechocystis sp. Strain PCC 6803 Involved in Survival under Nitrogen Stress

Alicia María Muro-Pastor,* Antonia Herrero, and Enrique Flores

Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas---Universidad de Sevilla, E-41092 Seville, Spain

Received 10 July 2000/Accepted 31 October 2000

The expression of sll1689, an open reading frame from the cyanobacterium Synechocystis sp. strain PCC 6803 putatively encoding a member of the sigma 70 family of sigma factors, appears to be regulated by the nitrogen control transcription factor NtcA. Disruption of sll1689 had no noticeable effect on exponential growth, identifying its product as a member of the group 2, nonessential class of sigma 70-like sigma factors; however, this disruption decreased the viability of the cells after long periods of nitrogen starvation. We have named this gene rpoD2-V. The expression of glnN, encoding a type III glutamine synthetase, was impaired in strains bearing an inactivated copy of the rpoD2-V gene.

* Corresponding author. Mailing address: Instituto de Bioquímica Vegetal y Fotosíntesis, Centro de Investigaciones Científicas Isla de la Cartuja, Avda. Américo Vespucio s/n, E-41092 Seville, Spain. Phone: 34-95-4489523. Fax: 34-95-4460065. E-mail: alicia{at}cica.es.

Journal of Bacteriology, February 2001, p. 1090-1095, Vol. 183, No. 3
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.3.1090-1095.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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