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Applied and Environmental Microbiology, March 2002, p. 1196-1203, Vol. 68, No. 3
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.3.1196-1203.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Functional Genomics Approach to Identifying Genes Required for Biofilm Development by Streptococcus mutans

Zezhang T. Wen and Robert A. Burne*

Department of Oral Biology, College of Dentistry, University of Florida, Gainesville, Florida 32610

Received 30 August 2001/ Accepted 6 December 2001

Streptococcus mutans, the primary etiological agent of human dental caries, is an obligate biofilm-forming bacterium. The goals of this study were to identify the gene(s) required for biofilm formation by this organism and to elucidate the role(s) that some of the known global regulators of gene expression play in controlling biofilm formation. In S. mutans UA159, the brpA gene (for biofilm regulatory protein) was found to encode a novel protein of 406 amino acid residues. A strain carrying an insertionally inactivated copy of brpA formed longer chains than did the parental strain, aggregated in liquid culture, and was unable to form biofilms as shown by an in vitro biofilm assay. A putative homologue of the enzyme responsible for synthesis of autoinducer II (AI-2) of the bacterial quorum-sensing system was also identified in S. mutans UA159, but insertional inactivation of the gene (luxSSm) did not alter colony or cell morphology or diminish the capacity of S. mutans to form biofilms. We also examined the role of the homologue of the Bacillus subtilis catabolite control protein CcpA in S. mutans in biofilm formation, and the results showed that loss of CcpA resulted in about a 60% decrease in the ability to form biofilms on an abiotic surface. From these data, we conclude that CcpA and BrpA may regulate genes that are required for stable biofilm formation by S. mutans.

* Corresponding author. Mailing address: Department of Oral Biology, College of Dentistry, University of Florida, Box 100424, Gainesville, FL 32610. Phone: (352) 392-0011. Fax: (352) 392-7357. E-mail: rburne{at}dental.ufl.edu.

Applied and Environmental Microbiology, March 2002, p. 1196-1203, Vol. 68, No. 3
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.3.1196-1203.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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