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Journal of Bacteriology, November 1998, p. 5803-5807, Vol. 180, No. 21
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Genes Involved in Cell Wall Localization and Side Chain Formation of Rhamnose-Glucose Polysaccharide in Streptococcus mutans

Yoshihisa Yamashita,* Yuichi Tsukioka, Kiyotaka Tomihisa, Yoshio Nakano, and Toshihiko Koga

Department of Preventive Dentistry, Kyushu University Faculty of Dentistry, Fukuoka 812-8582, Japan

Received 1 June 1998/Accepted 31 August 1998

We identified in Streptococcus mutans six new genes (rgpA through rgpF), whose disruption results in a loss of serotype-specific antigenicity, specified by the glucose side chains of rhamnose-glucose polysaccharide from the cell wall. Rhamnose and glucose content of the cell wall decreased drastically in all these disruption mutants, except that in the rgpE mutant only the glucose content decreased. RgpC and RgpD are homologous to ATP-binding cassette transporter components and may be involved in polysaccharide export, whereas RgpE may be a transferase of side chain glucose.


* Corresponding author. Mailing address: Department of Preventive Dentistry, Kyushu University Faculty of Dentistry, Fukuoka 812-8582, Japan. Phone: 81-92-642-6353. Fax: 81-92-642-6354. E-mail: yoshidha{at}mbox.nc.kyushu-u.ac.jp.


Journal of Bacteriology, November 1998, p. 5803-5807, Vol. 180, No. 21
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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