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Journal of Bacteriology, January 2002, p. 290-301, Vol. 184, No. 1
0021-9193/01/$04.00+0     DOI: 10.1128/JB.184.1.290-301.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Biofilm Formation and Dispersal under the Influence of the Global Regulator CsrA of Escherichia coli

Debra W. Jackson,1 Kazushi Suzuki,1 Lawrence Oakford,2 Jerry W. Simecka,1 Mark E. Hart,1 and Tony Romeo1*

Department of Molecular Biology and Immunology,1 Department of Pathology and Anatomy University of North Texas Health Science Center at Fort Worth, Fort Worth, Texas 76107-26992

Received 10 August 2001/ Accepted 3 October 2001

The predominant mode of growth of bacteria in the environment is within sessile, matrix-enclosed communities known as biofilms. Biofilms often complicate chronic and difficult-to-treat infections by protecting bacteria from the immune system, decreasing antibiotic efficacy, and dispersing planktonic cells to distant body sites. While the biology of bacterial biofilms has become a major focus of microbial research, the regulatory mechanisms of biofilm development remain poorly defined and those of dispersal are unknown. Here we establish that the RNA binding global regulatory protein CsrA (carbon storage regulator) of Escherichia coli K-12 serves as both a repressor of biofilm formation and an activator of biofilm dispersal under a variety of culture conditions. Ectopic expression of the E. coli K-12 csrA gene repressed biofilm formation by related bacterial pathogens. A csrA knockout mutation enhanced biofilm formation in E. coli strains that were defective for extracellular, surface, or regulatory factors previously implicated in biofilm formation. In contrast, this csrA mutation did not affect biofilm formation by a glgA (glycogen synthase) knockout mutant. Complementation studies with glg genes provided further genetic evidence that the effects of CsrA on biofilm formation are mediated largely through the regulation of intracellular glycogen biosynthesis and catabolism. Finally, the expression of a chromosomally encoded csrA'-'lacZ translational fusion was dynamically regulated during biofilm formation in a pattern consistent with its role as a repressor. We propose that global regulation of central carbon flux by CsrA is an extremely important feature of E. coli biofilm development.

* Corresponding author. Mailing address: Department of Molecular Biology and Immunology, University of North Texas Health Science Center at Fort Worth, 3500 Camp Bowie Blvd., Fort Worth, TX 76107-2699. Phone: (817) 735-2121. Fax: (817) 735-2118. E-mail: tromeo{at}hsc.unt.edu.

Journal of Bacteriology, January 2002, p. 290-301, Vol. 184, No. 1
0021-9193/01/$04.00+0     DOI: 10.1128/JB.184.1.290-301.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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