Abstract

α-1,4-Glucan lyases [glycoside hydrolase family (GH) 31] catalyze an elimination reaction to form 1,5-anhydro-d-fructose (AF), while GH31 α-glucosidases normally catalyze a hydrolytic reaction. We determined that a small amount of AF was produced by GH31 Aspergillus niger α-glucosidase from maltooligosaccharides by elimination reaction, likely via an oxocarbenium ion intermediate.

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