Alpha-1,6-glucan (None)

Alpha-1,6-glucan is a polysaccharide composed of glucose monomers linked via alpha-1,6-glycosidic bonds, with dextran being the most prominent biological and clinical example (PubChem CID 4125253). In microbiology, it is a primary component of the extracellular polymeric substance (EPS) matrix in bacterial biofilms, particularly those produced by Streptococcus mutans in the oral cavity, where it facilitates bacterial adhesion to tooth surfaces and provides structural integrity to dental plaque (Bowen & Koo, J Dent Res, 2011). Clinically, high-molecular-weight alpha-1,6-glucans (dextrans) are utilized as plasma volume expanders to treat hypovolemia and as antithrombotic agents to improve microcirculation by reducing blood viscosity (StatPearls, Dextran). As a therapeutic target, alpha-1,6-glucan is addressed through enzymatic degradation by dextranases or by inhibiting the glucosyltransferase enzymes responsible for its synthesis to disrupt pathogenic biofilms (Khalikova et al., Microbiol Mol Biol Rev, 2005). Additionally, its presence in certain fungal cell walls can trigger immune recognition, although it is less commonly cited as a primary pathogen-associated molecular pattern than beta-glucans. The clinical use of alpha-1,6-glucans is complicated by the risk of severe anaphylactoid reactions, often mediated by pre-existing anti-dextran antibodies (Laxenaire et al., Ann Fr Anesth Reanim, 1994).

Other names

DextranPoly-alpha-1,6-glucosideIsomalto-dextran1,6-alpha-D-glucanLimit dextrin (alpha-1,6-branched component)

Enzymatic hydrolysis of alpha-1,6-glycosidic bonds to disrupt biofilm architecture; Inhibition of polysaccharide synthesis via glucosyltransferase blockade; Increase in plasma oncotic pressure for volume expansion.