alpha-1,3-glucan

alpha-1,3-glucan is a critical exopolysaccharide component of the extracellular polymeric substance (EPS) matrix in bacterial biofilms, most notably in dental plaque formed by Streptococcus mutans [2, 10]. Synthesized from dietary sucrose by extracellular glucosyltransferases, this water-insoluble polymer provides the essential structural framework and adhesive properties required for biofilm stability and attachment to tooth surfaces [7, 13]. Beyond its structural role, alpha-1,3-glucan acts as a protective barrier that sequesters antimicrobial agents and shields bacteria from host immune responses, contributing significantly to the high antibiotic resistance observed in biofilm-associated infections [8, 15]. In the context of oral health, the accumulation of alpha-1,3-glucan facilitates the localized production of organic acids, leading to enamel demineralization and the development of dental caries [4, 17]. Therapeutic strategies targeting this molecule involve the use of glucanohydrolases, such as mutanase (alpha-1,3-glucanase), which enzymatically hydrolyze the alpha-1,3-glycosidic bonds to destabilize the biofilm architecture [5, 11]. This non-biocidal approach promotes biofilm dispersal and enhances the efficacy of co-administered antimicrobial agents without indiscriminately killing the commensal oral microbiota [2, 3].

Other names

MutanWater-insoluble glucanWIG(1->3)-alpha-D-glucanalpha-1,3-linked glucan

Enzymatic hydrolysis of alpha-1,3-glycosidic bonds leading to biofilm matrix degradation and dispersal