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Appl. Environ. Microbiol., Jul 1995, 2768-2770, Vol 61, No. 7
Copyright © 1995, American Society for Microbiology

Glucosyltransferase from Streptococcus sobrinus Catalyzes Glucosylation of Catechin

K Nakahara, M Kontani, H Ono, T Kodama, T Tanaka, T Ooshima and S Hamada
Institute for Biomedical Research, Suntory Ltd., Wakayamadai, Shimamotocho-Osaka 618, and Departments of Pedodontics and Oral Microbiology, Osaka University Faculty of Dentistry, Yamadaoka, Suita-Osaka 565, Japan

We previously showed that the polymeric forms of polyphenols present in oolong tea extract exhibited strong inhibitory activities against glucosyltransferases (GTases) of mutans streptococci, while green tea extract, which is rich in catechins, did not show such GTase-inhibitory activities. In this study, (+)-catechin [2-(3,4-dihydroxyphenyl)-3,4-dihydro-2H-1-benzopyran-3,5,7-triol] was found to be glucosylated by the GTase of Streptococcus sobrinus 6715 with sucrose as the substrate, and the product was identified as 4(prm1)-O-(alpha)-d-glucopyranosyl-(+)-catechin, with a molecular weight of 452. The (alpha)-glucosylated (+)-catechin did not exhibit significant inhibition of glucan synthesis from sucrose by the GTase, which is in contrast to the polymeric polyphenols isolated from oolong tea leaves.

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