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J Bacteriol, February 1998, p. 742-745, Vol. 180, No. 3
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Two Separate Regulatory Systems Participate in Control of Swarming Motility of Serratia liquefaciens MG1

Michael Givskov,1,* Jörgen Östling,2 Leo Eberl,3 Peter W. Lindum,1 Allan Beck Christensen,1 Gunna Christiansen,4 Søren Molin,1 and Staffan Kjelleberg5

Department of Microbiology, The Technical University of Denmark, Lyngby DK-2800, Denmark1; Department of General and Marine Microbiology, Göteborg University, S-413 90 Göteborg, Sweden2; Lehrstuhl für Mikrobiologie, Technische Universität München, D-80290 Munich, Germany3; Institute of Medical Microbiology, University of Aarhus, Århus DK-8000, Denmark4; and School of Microbiology and Immunology, University of New South Wales, Sydney 2052, Australia5

Received 15 September 1997/Accepted 14 November 1997

Swarming motility of Serratia liquefaciens MG1 requires the expression of two genetic loci, flhDC and swrI. Here we demonstrate that the products of the flhDC operon (the flagellar master regulator) and the swrI gene (the extracellular signal molecule N-butanoyl-L-homoserine lactone) are global regulators which control two separate regulons.

* Corresponding author. Mailing address: Department of Microbiology, Bldg. 301, The Technical University of Denmark, Lyngby DK-2800, Denmark. Phone: 45 45252769. Fax: 45 45932809. E-mail: mg{at}im.dtu.dk.




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