Enzymatic Synthesis of α-2-Deoxyglucosyl Derivatives Catalyzed by Organic Solvent-Resistant α-Glucosidase

Organic solvent-resistant Aspergillus niger alpha-glucosidase (ANGase) can synthesize alpha-2-deoxyglucosyl derivatives (2DDs) in water-organic solvent media by a trans-addition reaction from D-glucal to various acceptors. Herein, we studied the influence of four different solvents on ANGase stability and activity. ANGase exhibited 47 or 43% residual activity following incubation in 50% (v/v) or in 70% (v/v) acetone for 4 h, respectively. When various carbohydrates were used as acceptor molecules, ANGase catalyzed the addition reaction of four different sugar alcohols, glucose, sucrose, or trehalose to D-glucal. Among the acceptor molecules tested, xylitol was the best acceptor by producing the highest yield (87% addition). The concentration of acetone/acceptor influenced the formation of 2DDs and the yields. We confirmed the molecular weight of five kinds of products by mass spectrometry and enzymatic hydrolysis. Current method is useful for the production of carbohydrates containing 2-deoxyglucose moiety. (C) KSBB