Cellopentaose is a linear β-1,4-linked pentasaccharide composed of five D-glucose units, with the chemical formula C₃₀H₅₂O₂₆ and a molecular weight of 828.72 g/mol. It serves as a key oligosaccharide derived from cellulose hydrolysis, exhibiting high purity (>95%) in commercial forms and specific rotation [α]²⁰/D +11.0 to +14.5° (c=1, H₂O). This structure mimics cellulosic fragments, enabling precise studies in enzymatic degradation.

Structural Features

The repeating β-D-Glcp-(1→4) linkage defines its rigid, linear backbone, distinguishing it from branched glycans like blood group antigens. As O-β-D-glucopyranosyl-(1→4)-O-β-D-glucopyranosyl-(1→4)-O-β-D-glucopyranosyl-(1→4)-O-β-D-glucopyranosyl-(1→4)-D-glucose, it acts as a substrate for endo-cellulases. Its white powder to crystal appearance supports solubility in aqueous systems for biochemical assays.

Biological and Enzymatic Roles

Cellopentaose functions as a synthetic acceptor for characterizing carbohydrate-binding modules and lytic polysaccharide monooxygenases (LPMOs) in cellulose deconstruction. It binds to enzymes like GH6 cellobiohydrolases and AA9 LPMOs, promoting non-lytic cell wall loosening and boosting saccharification of cellulosic biomass such as phosphoric acid-swollen cellulose. Applications include microarrays for profiling oligosaccharide-binding proteins and enhancing PETase activity on synthetic polymers via surface hydrophilization.

Applications in Research

Commercial availability facilitates its use in validating cellulase activity and EXLX protein impacts on interfibrillar cellulose spacing. It supports high-throughput enzyme screening and structural modification studies in biofuel production and biomass valorization. Purity standards ensure reliability in halotolerant glycoside hydrolase characterizations and synergy with GH12 enzymes.