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Journal of Bacteriology, September 2003, p. 5290-5294, Vol. 185, No. 17
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.17.5290-5294.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Inactivation of ompR Promotes Precocious Swarming and flhDC Expression in Xenorhabdus nematophila

Dong-jin Kim, Brian Boylan, Nicholas George, and Steven Forst*

Department of Biological Sciences, University of Wisconsin, Milwaukee, Wisconsin

Received 31 March 2003/ Accepted 12 June 2003

The response regulator OmpR is involved in numerous adaptive responses to environmental challenges. The role that OmpR plays in swarming behavior and swarm-cell differentiation in the symbiotic-pathogenic bacterium Xenorhabdus nematophila was examined in this study. Swarming began 4 h sooner in an ompR mutant strain than in wild-type cells. Precocious swarming was correlated with elevated expression of fliC, early flagellation, and cell elongation. The level of flhDC mRNA was elevated during the early period of swarming in the ompR strain relative to the level in the wild type. These findings show that OmpR is involved in the temporal regulation of flhDC expression and flagellum production and demonstrate that this response regulator plays a role in the swarming behavior of X. nematophila.

* Corresponding author. Mailing address: Department of Biological Sciences, P.O. Box 413, University of Wisconsin, Milwaukee, WI 53201. Phone: (414) 229-6373. Fax: (414) 229-3926. E-mail: sforst{at}uwm.edu.

Journal of Bacteriology, September 2003, p. 5290-5294, Vol. 185, No. 17
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.17.5290-5294.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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