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Journal of Bacteriology, July 2001, p. 4374-4381, Vol. 183, No. 14
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.14.4374-4381.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Evidence that an Additional Mutation Is Required To Tolerate Insertional Inactivation of the Streptomyces lividans recA Gene

Silke Vierling, Tilmann Weber, Wolfgang Wohlleben, and Günther Muth*

Mikrobiologie/Biotechnologie, Universität Tübingen, Auf der Morgenstelle 28, D-72076 Tübingen, Germany

Received 27 December 2000/Accepted 9 April 2001

In contrast to recA of other bacteria, the recA gene of Streptomyces lividans has been described as indispensable for viability (G. Muth, D. Frese, A. Kleber, and W. Wohlleben, Mol. Gen. Genet. 255:420-428, 1997.). Therefore, a closer analysis of this gene was performed to detect possible unique features distinguishing the Streptomyces RecA protein from the well-characterized Escherichia coli RecA protein. The S. lividans recA gene restored UV resistance and recombination activity of an E. coli recA mutant. Also, transcriptional regulation was similar to that of E. coli recA. Gel retardation experiments showed that S. lividans recA is also under control of the Streptomyces SOS repressor LexA. The S. lividans recA gene could be replaced only by simultaneously expressing a plasmid encoded recA copy. Surprisingly, the recA expression plasmid could subsequently be eliminated using an incompatible plasmid without the loss of viability. Besides being UV sensitive and recombination deficient, all the mutants were blocked in sporulation. Genetic complementation restored UV resistance and recombination activity but did not affect the sporulation defect. This indicated that all the recA mutants had suffered from an additional mutation, which might allow toleration of a recA deficiency.

* Corresponding author. Mailing address: Mikrobiologie/Biotechnologie, Universität Tübingen, Auf der Morgenstelle 28, D-72076 Tübingen, Germany. Phone: 49 7071 2974637 or 49 7071 2976945. Fax: 49 7071 295979. E-mail: gmuth{at}biotech.uni-tuebingen.de.

Journal of Bacteriology, July 2001, p. 4374-4381, Vol. 183, No. 14
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.14.4374-4381.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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