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  • Title: Effect of lactoperoxidase system on glucosyltransferase D of Streptococcus mutans.
    Author: Yu X, Loimaranta V, Lenander-Lumikari M, Wunder D, Bowen WH, Tenuvuo J.
    Journal: Chin J Dent Res; 2000 Aug; 3(2):61-4. PubMed ID: 11314522.
    Abstract:
    OBJECTIVE: To investigate the effects of the peroxidase system (LP, H2O2, SCN) and its components on the activity of glucosyltransferase D (GtfD) originating from Streptococcus mutans (S. mutans). METHODS: GtfD was incubated in buffered-KCl assay mixture that contained 20 microM dextran and 100 mM sucrose including 14C-glucose. The activity of GtfD was measured with a scintillation counter. The effects of lactoperoxidase system and its components on GtfD activity were examined by incubating different components separately and together with GtfD. RESULTS: The lactoperoxidase system-generated hypothiocyanite (OSCN) had no effect on the activity of streptococcal GtfD, while the lactoperoxidase enzyme inhibited GtfD. The ratio between the 2 enzymes, LP and GtfD, was important for the inhibition. However, if LP was combined with its substrates, SCN and/or a high concentration of H2O2, it enhanced the activity of GtfD. CONCLUSION: Peroxidase-generated antimicrobial agent HOSCN/OSCN is not inhibitory against GtfD, whereas low concentrations of the LP-enzyme inhibit GtfD.
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