Streptococcus mutans glucosyltransferase and protein antigen C (GTF and PAc)

Streptococcus mutans glucosyltransferase (GTF) and protein antigen C (PAc) are primary virulence factors responsible for the initiation and progression of dental caries. GTFs are enzymes that catalyze the conversion of dietary sucrose into insoluble extracellular polysaccharides (glucans), which provide the structural matrix for dental biofilm (plaque) and facilitate bacterial accumulation. PAc, also known as Antigen I/II or SpaP, is a cell-surface adhesin that mediates the initial attachment of S. mutans to the tooth surface by binding to the salivary pellicle. Together, these proteins enable the transition of S. mutans from a planktonic state to a pathogenic biofilm, creating an acidic microenvironment that demineralizes tooth enamel. Therapeutic strategies targeting these molecules include small-molecule inhibitors of GTF activity, anti-adhesive agents, and mucosal vaccines designed to elicit protective antibodies that block bacterial colonization and biofilm maturation.

Other names

Glucosyltransferase (GTF)Protein antigen C (PAc)Antigen I/II (Ag I/II)Surface protein P1SpaPPac proteinSucrose:1,6-alpha-D-glucan 3-alpha-D-glucosyltransferaseSucrose:1,3-alpha-D-glucan 6-alpha-D-glucosyltransferase

Inhibition of glucosyltransferase enzymatic activity to prevent glucan synthesis; blocking of PAc-mediated adhesion to the salivary pellicle; induction of mucosal immunity (IgA) to neutralize bacterial colonization.