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Journal of Bacteriology, May 2005, p. 3477-3485, Vol. 187, No. 10
0021-9193/05/$08.00+0     doi:10.1128/JB.187.10.3477-3485.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Biofilm Formation and Sloughing in Serratia marcescens Are Controlled by Quorum Sensing and Nutrient Cues

S. A. Rice,1,2 K. S. Koh,1,2 S. Y. Queck,1,2 M. Labbate,1,2 K. W. Lam,1,2 and S. Kjelleberg1,2*

The Centre for Marine Biofouling and Bio-Innovation,1 The School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW 2052 Australia2

Received 17 January 2005/ Accepted 3 February 2005

We describe here a role for quorum sensing in the detachment, or sloughing, of Serratia marcescens filamentous biofilms, and we show that nutrient conditions affect the biofilm morphotype. Under reduced carbon or nitrogen conditions, S. marcescens formed a classical biofilm consisting of microcolonies. The filamentous biofilm could be converted to a microcolony-type biofilm by switching the medium after establishment of the biofilm. Similarly, when initially grown as a microcolony biofilm, S. marcescens could be converted back to a filamentous biofilm by increasing the nutrient composition. Under high-nutrient conditions, an N-acyl homoserine lactone quorum-sensing mutant formed biofilms that were indistinguishable from the wild-type biofilms. Similarly, other quorum-sensing-dependent behaviors, such as swarming motility, could be rendered quorum sensing independent by manipulating the growth medium. Quorum sensing was also found to be involved in the sloughing of the filamentous biofilm. The biofilm formed by the bacterium consistently sloughed from the substratum after approximately 75 to 80 h of development. The quorum-sensing mutant, when supplemented with exogenous signal, formed a wild-type filamentous biofilm and sloughed at the same time as the wild type, and this was independent of surfactant production. When we removed the signal from the quorum-sensing mutant prior to the time of sloughing, the biofilm did not undergo significant detachment. Together, the data suggest that biofilm formation by S. marcescens is a dynamic process that is controlled by both nutrient cues and the quorum-sensing system.

* Corresponding author. Mailing address: The Centre for Marine Biofouling and Bio-Innovation, The University of New South Wales, Sydney, NSW 2052 Australia. Phone: 612 9385 1000. Fax: 612 9385 1779. E-mail: S.Kjelleberg{at}unsw.edu.au.

Journal of Bacteriology, May 2005, p. 3477-3485, Vol. 187, No. 10
0021-9193/05/$08.00+0     doi:10.1128/JB.187.10.3477-3485.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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