Molecular analysis of the inhibitory effects of oolong tea polyphenols on glucan-binding domain of recombinant glucosyltransferases from Streptococcus mutans MT8148

M. Matsumoto, S. Hamada, T. Ooshima

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

An oolong tea polyphenol (OTF6) has been shown to possess a strong anti-glucosyltransferase (GTF) activity and inhibit experimental dental caries in rats infected with mutans streptococci. The effects of OTF6 on the functional domains of GTFs of Streptococcus mutans, an N-terminal catalytic domain (CAT), and a C-terminal glucan-binding domain (GBD), were examined. The maximum velocity of glucan synthesis by recombinant GTFB (rGTFB) and GTFD (rGTFD) became significantly slower in the presence of OTF6, however, K m values remained stable when compared in their absence. These results suggest that OTF6 reduces glucan synthesis by non-competitively inhibiting the GBD of S. mutans GTFB and GTFD. Further, the recombinant proteins of CAT (rCAT) and GBD (rGBD) were expressed using Escherichia coli, and purified by affinity column chromatography. rGBD but not rCAT was found to possess dextran-binding activity, which was shown to be inhibited by OTF6. These results indicate that OTF6, a polymeric polyphenol specific for oolong tea is able to reduce glucan synthesis by inhibiting the GBD of S. mutans GTFB.

Original languageEnglish
Pages (from-to)73-80
Number of pages8
JournalFEMS Microbiology Letters
Volume228
Issue number1
DOIs
Publication statusPublished - Nov 7 2003
Externally publishedYes

Keywords

  • Dental caries
  • Glucan-binding domain
  • Oolong tea
  • Polyphenol
  • Recombinant glucosyltransferase
  • Streptococcus mutans

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

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