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Journal of Bacteriology, April 2006, p. 2898-2906, Vol. 188, No. 8
0021-9193/06/$08.00+0     doi:10.1128/JB.188.8.2898-2906.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

The ppuI-rsaL-ppuR Quorum-Sensing System Regulates Biofilm Formation of Pseudomonas putida PCL1445 by Controlling Biosynthesis of the Cyclic Lipopeptides Putisolvins I and II

Jean-Frédéric Dubern, Ben J. J. Lugtenberg, and Guido V. Bloemberg*

Leiden University, Institute of Biology, Wassenaarseweg 64, 2333 AL Leiden, The Netherlands

Received 7 November 2005/ Accepted 1 February 2006

Pseudomonas putida strain PCL1445 produces two cyclic lipopeptides, putisolvin I and putisolvin II, which possess surface tension-reducing abilities and are able to inhibit biofilm formation and to break down existing biofilms of several Pseudomonas spp., including P. aeruginosa. Putisolvins are secreted in the culture medium during growth at late exponential phase, indicating that production is possibly regulated by quorum sensing. In the present study, we identified a quorum-sensing system in PCL1445 that is composed of ppuI, rsaL, and ppuR and shows very high similarity with gene clusters of P. putida strains IsoF and WCS358. Strains with mutations in ppuI and ppuR showed a severe reduction of putisolvin production. Expression analysis of the putisolvin biosynthetic gene in a ppuI background showed decreased expression, which could be complemented by the addition of synthetic 3-oxo-C10-N-acyl homoserine lactone (3-oxo-C10-AHL) or 3-oxo-C12-AHL to the medium. An rsaL mutant overproduces AHLs, and production of putisolvins is induced early during growth. Analysis of biofilm formation on polyvinylchloride showed that ppuI and ppuR mutants produce a denser biofilm than PCL1445, which correlates with decreased production of putisolvins, whereas an rsaL mutant shows a delay in biofilm production, which correlates with early production of putisolvins. The results demonstrate that quorum-sensing signals induce the production of cyclic lipopeptides putisolvin I and II and consequently control biofilm formation by Pseudomonas putida.

* Corresponding author. Mailing address: Leiden University, Institute of Biology, Wassenaarseweg 64, 2333 AL Leiden, The Netherlands. Phone: 31 71 527 5076. Fax: 31 71 527 5088. E-mail: bloemberg{at}rulbim.leidenuniv.nl.

Journal of Bacteriology, April 2006, p. 2898-2906, Vol. 188, No. 8
0021-9193/06/$08.00+0     doi:10.1128/JB.188.8.2898-2906.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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