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Journal of Bacteriology, June 2004, p. 3794-3805, Vol. 186, No. 12
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.12.3794-3805.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Quorum Sensing Regulates Type III Secretion in Vibrio harveyi and Vibrio parahaemolyticus

Jennifer M. Henke and Bonnie L. Bassler*

Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544-1014

Received 26 November 2003/ Accepted 7 January 2004

In a process known as quorum sensing, bacteria communicate with one another by producing, releasing, detecting, and responding to signal molecules called autoinducers. Vibrio harveyi, a marine pathogen, uses two parallel quorum-sensing circuits, each consisting of an autoinducer-sensor pair, to control the expression of genes required for bioluminescence and a number of other target genes. Genetic screens designed to discover autoinducer-regulated targets in V. harveyi have revealed genes encoding components of a putative type III secretion (TTS) system. Using transcriptional reporter fusions and TTS protein localization studies, we show that the TTS system is indeed functional in V. harveyi and that expression of the genes encoding the secretion machinery requires an intact quorum-sensing signal transduction cascade. The newly completed genome of the closely related marine bacterium Vibrio parahaemolyticus, which is a human pathogen, shows that it possesses the genes encoding both of the V. harveyi-like quorum-sensing signaling circuits and that it also has a TTS system similar to that of V. harveyi. We show that quorum sensing regulates TTS in V. parahaemolyticus. Previous reports connecting quorum sensing to TTS in enterohemorrhagic and enteropathogenic Escherichia coli show that quorum sensing activates TTS at high cell density. Surprisingly, we find that at high cell density (in the presence of autoinducers), quorum sensing represses TTS in V. harveyi and V. parahaemolyticus.

* Corresponding author. Mailing address: Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544-1014. Phone: (609) 258-2857. Fax: (609) 258-6175. E-mail: bbassler{at}molbio.princeton.edu.

Journal of Bacteriology, June 2004, p. 3794-3805, Vol. 186, No. 12
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.12.3794-3805.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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