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Journal of Bacteriology, September 2001, p. 5445-5448, Vol. 183, No. 18
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.18.5445-5448.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Involvement of sigma S in Starvation-Induced Transposition of Pseudomonas putida Transposon Tn4652

Heili Ilves, Rita Hõrak,* and Maia Kivisaar

Estonian Biocentre and Institute of Molecular and Cell Biology, Tartu University, 51010 Tartu, Estonia

Received 9 April 2001/Accepted 11 June 2001

Transpositional activity of mobile elements can be induced by different environmental stresses. Here, we present evidence that transposition of Tn4652 is elevated in stationary-phase Pseudomonas putida and suppressed in an isogenic sigma S-defective strain. We demonstrate that transcription from the Tn4652 transposase promoter is controlled by the stationary-phase-specific sigma factor sigma S. To our knowledge, this is the first example of direct stationary-phase-specific regulation of a mobile element transposase. Data presented in this report support the idea that activation of transposition under stressful conditions could be an inducible process.

* Corresponding author. Mailing address: Estonian Biocentre and Institute of Molecular and Cell Biology, Tartu University, 23 Riia Street, 51010 Tartu, Estonia. Phone: 372-7-375015. Fax: 372-7-420286. E-mail: rhorak{at}ebc.ee.

Journal of Bacteriology, September 2001, p. 5445-5448, Vol. 183, No. 18
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.18.5445-5448.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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