Glucosyltransferase D (GtfD) (GtfD)

Glucosyltransferase D (GtfD), also known as Glucosyltransferase-S, is an extracellular enzyme produced by the cariogenic bacterium Streptococcus mutans. It plays a pivotal role in the pathogenesis of dental caries by catalyzing the conversion of dietary sucrose into water-soluble glucans, primarily α-1,6-linked dextran. These soluble glucans serve as essential primers for other glucosyltransferases, such as GtfB and GtfC, which synthesize the water-insoluble glucans that form the structural scaffold of the dental biofilm (plaque). By facilitating bacterial adhesion and the accumulation of a protective extracellular polysaccharide matrix, GtfD enables S. mutans to colonize tooth surfaces and create an acidic microenvironment that leads to enamel demineralization. Beyond oral disease, GtfD is also implicated in systemic infections like infectious endocarditis when the bacteria enter the bloodstream. As a key virulence factor, GtfD is a major therapeutic target for anti-caries agents designed to disrupt biofilm formation without exerting selective pressure for antibiotic resistance. Various natural products, including apigenin and curcumin, as well as synthetic inhibitors like quinoxaline derivatives, have been shown to antagonize GtfD activity or suppress its expression.

Other names

Glucosyltransferase-SGTF-S1,6-alpha-glucan synthaseSucrose:1,6-alpha-D-glucan 6-alpha-D-glucosyltransferase

Inhibition of glucan synthesis, competitive inhibition of the catalytic site, and prevention of biofilm matrix formation.