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Journal of Bacteriology, September 1998, p. 4946-4949, Vol. 180, No. 18
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Transcriptional Analysis and Mutation of a dnaA-Like Gene in Synechocystis sp. Strain PCC 6803

Stefan Richter,1,dagger Martin Hagemann,2 and Walter Messer1,*

Max-Planck-Institut für molekulare Genetik, D-14195 Berlin,1 and Fachbereich Biologie, Universität Rostock, D-18051 Rostock,2 Germany

Received 14 May 1998/Accepted 17 July 1998

Transcription of the dnaA gene of the cyanobacterium Synechocystis sp. strain PCC 6803 is light dependent and yields a monocistronic mRNA, as determined by Northern analysis. Surprisingly, mutants with inactivated dnaA were viable. In batch cultures under standard conditions, the mutants grew like the wild type and did not show an aberrant phenotype. We conclude that, unlike the situation in other bacteria, dnaA of Synechocystis sp. cannot have an essential function, such as initiation of DNA replication.

* Corresponding author. Mailing address: Max-Planck-Institut für molekulare Genetik, Ihnestr. 73, D-14195 Berlin, Germany. Phone: 49-30-8413-1266. Fax: 49-30-8413-1385. E-mail: messer{at}mpimg-berlin-dahlem.mpg.de.

dagger Present address: Department of Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637.

Journal of Bacteriology, September 1998, p. 4946-4949, Vol. 180, No. 18
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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