Ugarte MA, Rodríguez P. Presence of an extracellular glycosyltransferase in human dental plaque.
THE INTERNATIONAL JOURNAL OF BIOCHEMISTRY 1991;
23:719-26. [PMID:
1713862 DOI:
10.1016/0020-711x(91)90043-m]
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Abstract
1. Glycosyltransferase activity incorporating 14C-radioactivity from [14C]sucrose into endogenous acceptor was demonstrated in human dental plaque. 2. The enzyme was localized in dental plaque into two forms: (a) associated form to bacteria (pellet 10,000 g) and (b) released as an extracellular form (supernatant 10,000 g). 3. The reaction product was insoluble in 95% ethanol, soluble in trichloroacetic acid, and it was a mixture of saccharides with different sizes, as was demonstrated by column chromatography. 4. Exogenous activity with Dextran T-10 as substrate was also demonstrated, and it represented 9% of the total endogenous activity. 5. Characterization of the extracellular glycosyltransferase, and comparative results with glycosyltransferase secreted by oral bacteria in cultures medium are discussed.
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