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Three d-glucan-hydrolysing enzymes from Bacteroides oralis Ig4a have been isolated. Two of them are dextranases which hydrolyse (1→6) but not (1→3) linked α-d-glucans; one (EC 3.2.1.11,1,6-α-d-glucan 6-glucanohydrolase) is localized in the periplasm, and the other, which is an exo-enzyme (EC 3.2.1.70,1,6-α-d-glucan glucohydrolase), in the cytoplasm. The third is a mutanase (EC 3.2.1.59, 1,3-(1,3;1,4)-α-d-glucan 3-glucanohydrolase) that hydrolyses (1→3) but not (1→6) linked α-d-glucans, and is present only in the cytoplasm.
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