AEM Accepts, published online ahead of print on 10 November 2006

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Appl. Environ. Microbiol. doi:10.1128/AEM.01681-06
Copyright (c) 2006, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.

Cross-Species GacA-Controlled Induction of Antibiosis in Pseudomonads

Christophe Dubuis and Dieter Haas^*

Département de Microbiologie Fondamentale, Université de Lausanne, CH-1015 Lausanne, Switzerland

^* To whom correspondence should be addressed. Email: Dieter.Haas{at}unil.ch.

Signal extracts prepared from culture supernatants of Pseudomonas fluorescens CHA0 and Pseudomonas aeruginosa PAO stimulated GacA-dependent expression of small RNAs and hence of antibiotic compounds in both hosts. Pseudomonas corrugata LMG2172 and P. fluorescens SBW25 also produced signal molecules stimulating GacA-controlled antibiotic synthesis in strain CHA0, illustrating a novel, N-acyl-homoserine lactone-independent type of interspecies communication.

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