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Microbiology 149 (2003), 1923-1933; DOI  10.1099/mic.0.26321-0
© 2003 Society for General Microbiology

Signal-mediated cross-talk regulates stress adaptation in Vibrio species

Diane McDougald1,2, Sujatha Srinivasan1,{dagger}, Scott A. Rice1,2 and Staffan Kjelleberg1,2

1 School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney 2052, Australia
2 Centre for Marine Biofouling and Bio-Innovation, University of New South Wales, Sydney 2052, Australia

Correspondence
Staffan Kjelleberg
s.kjelleberg{at}unsw.edu.au

Quorum sensing systems serve as a means of ‘census taking’ of conspecific and non-conspecific bacteria in the near vicinity. The acylated homoserine lactone (AHL) quorum sensing system has been proposed to be primarily an intra-specific communication system, while the AI-2 autoinducer signalling system is proposed to be an interspecific communication system. Here it is shown that AI-2-like signalling in two marine Vibrio species, Vibrio vulnificus and ‘Vibrio angustum’ S14, induces the core response phenotypes of starvation adaptation and stress resistance, and that a signal antagonist can competitively inhibit these phenotypes. Furthermore, the signals produced by a range of Vibrio species have the ability to induce these phenotypes in V. vulnificus and ‘V. angustum’ S14, indicating that, at least in Vibrio species, AI-2-like signalling systems function as interspecies communication systems capable of ‘cross-talk’ and of regulating environmentally relevant phenotypes.

Abbreviations: AHL, acylated homoserine lactone; HBHL, N-(3-hydroxybutanoyl)-L-homoserine lactone; SIMC, starvation-induced maintenance of culturability; SSE, stationary-phase supernatant extract

{dagger}Present address: Department of Microbiology, University of Washington, Seattle, WA, USA.




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