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Dextran glucosidase from Streptococcus mutans (SmDG), which belongs to glycoside hydrolase family 13 (GH13), hydrolyzes the non-reducing terminal glucosidic linkage of isomaltooligosaccharides and dextran. Thermal deactivation of SmDG did not follow the single exponential decay but rather the two-step irreversible deactivation model, which involves an active intermediate having 39% specific activity. The presence of a low concentration of CaCl 2 increased the thermostability of SmDG, mainly duedoi:10.1271/bbb.110256 pmid:21821929 fatcat:w5h3ur5i5jf67i7oh5x6hpxzz4