Involvement of sigma(S) in starvation-induced transposition of Pseudomonas putida transposon Tn4652
1Estonian Biocentre and Institute of Molecular and Cell Biology, Tartu University, 51010 Tartu, Estonia.
Abstract:
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.
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