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Infect Immun, August 1998, p. 3736-3743, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Regulation of Sucrose-6-Phosphate Hydrolase Activity in Streptococcus mutans: Characterization of the scrR Gene

Koichi Hiratsuka,dagger Bing Wang, Yutaka Sato,Dagger and Howard Kuramitsu*

Department of Oral Biology, State University of New York, Buffalo, New York 14214

Received 10 November 1997/Returned for modification 18 February 1998/Accepted 22 May 1998

Previous results have implicated an important role for the enzyme IIScr, the sucrose-specific permease, in the transport of sucrose by cariogenic Streptococcus mutans. The product of the scrB gene, sucrose-6-phosphate hydrolase (Suc-6PH), is required for the metabolism of phosphorylated sucrose. The results from the utilization of scrB::lacZ fusions in S. mutans GS-5 have suggested that sucrose-grown cells have higher levels of scrB gene expression than do cells grown with glucose or fructose. Northern blot analysis of scrB transcripts has also confirmed the relative strengths of expression as sucrose>glucose>fructose. Immediately downstream from the scrB gene, an open reading frame with homology to regulatory proteins of the GalR-LacI family as well as to ScrR proteins from several other bacteria has been identified. In addition, this gene appears to be transcribed in the same operon as scrB. Inactivation of this gene, scrR, did not alter the relative expression of the scrB gene in the presence of sucrose or fructose but did increase SUC-6PH levels in the presence of glucose to that observed with sucrose. Furthermore, the S. mutans ScrR homolog appears to bind to the scrB promoter region as determined from the results of gel shift assays. These results suggest that the scrR gene is involved in the regulation of scrB, and likely scrA, expression. However, it is not clear whether sucrose acts as an inducer of expression of these genes or, alternatively, whether glucose and fructose act as repressors.

* Corresponding author. Mailing address: Department of Oral Biology, SUNY, 3435 Main Street, Buffalo, NY 14214. Phone: (716) 829-2068. Fax: (716) 829-3942. E-mail: KURAMITS{at}ACSU.BUFFALO.EDU.

dagger Present address: Department of Biochemistry, Nihon University Dental School, Matsudo, Japan.

Dagger Present address: Department of Biochemistry, Tokyo Dental College, Chiba City, Japan.

Infect Immun, August 1998, p. 3736-3743, Vol. 66, No. 8
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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