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Journal of Bacteriology, September 2003, p. 5627-5631, Vol. 185, No. 18
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.18.5627-5631.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Rapid Surface Motility in Bacillus subtilis Is Dependent on Extracellular Surfactin and Potassium Ion

Rebecca F. Kinsinger, Megan C. Shirk, and Ray Fall*

Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215

Received 7 February 2003/ Accepted 30 June 2003

Motility on surfaces is an important mechanism for bacterial colonization of new environments. In this report, we describe detection of rapid surface motility in the wild-type Bacillus subtilis Marburg strain, but not in several B. subtilis 168 derivatives. Motility involved formation of rapidly spreading dendritic structures, followed by profuse surface colonies if sufficient potassium ion was present. Potassium ion stimulated surfactin secretion, and the role of surfactin in surface motility was confirmed by deletion of a surfactin synthase gene. Significantly, this motility was independent of flagella. These results demonstrate that wild-type B. subtilis strains can use both swimming and sliding-type mechanisms to move across surfaces.

* Corresponding author. Mailing address: Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309-0215. Phone: (303) 492-7914. Fax: (303) 492-1149. E-mail: fall{at}colorado.edu.

Journal of Bacteriology, September 2003, p. 5627-5631, Vol. 185, No. 18
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.18.5627-5631.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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