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Journal of Bacteriology, January 2005, p. 771-777, Vol. 187, No. 2
0021-9193/05/$08.00+0     doi:10.1128/JB.187.2.771-777.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Evidence for Two Flagellar Stators and Their Role in the Motility of Pseudomonas aeruginosa{dagger}

Christine M. Toutain, Michael E. Zegans, and George A. O'Toole*

Department of Microbiology and Immunology, Dartmouth Medical School, Hanover, New Hampshire

Received 24 August 2004/ Accepted 11 October 2004

Pseudomonas aeruginosa is a ubiquitous bacterium capable of twitching, swimming, and swarming motility. In this study, we present evidence that P. aeruginosa has two flagellar stators, conserved in all pseudomonads as well as some other gram-negative bacteria. Either stator is sufficient for swimming, but both are necessary for swarming motility under most of the conditions tested, suggesting that these two stators may have different roles in these two types of motility.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Room 505, Vail Building, Dartmouth Medical School, Hanover, NH 03755. Phone: (603) 650-1248. Fax: (603) 650-1245. E-mail: georgeo{at}dartmouth.edu.

{dagger} Supplemental material for this article may be found at http://jb.asm.org/.

Journal of Bacteriology, January 2005, p. 771-777, Vol. 187, No. 2
0021-9193/05/$08.00+0     doi:10.1128/JB.187.2.771-777.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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