ID   2.4.1.397
DE   cyclic beta-1,2-glucan glucanotransferase.
CA   Cyclizes part of a (1->2)-beta-D-glucan chain by formation of a (1->2)-
CA   beta-D-glucosidic bond.
CC   -!- This enzyme is the cyclization domain of cyclic beta-1,2-glucan
CC       synthase.
CC   -!- Enzymes from Brucella abortus and Thermoanaerobacter italicus were
CC       characterized.
CC   -!- The cyclization domain of cyclic beta-1,2-glucan synthase is flanked
CC       by an N-terminal beta-1,2-glucosyltransferase domain (cf.
CC       EC 2.4.1.391) and a C-terminal beta-1,2-glucoside phosphorylase
CC       domain (cf. EC 2.4.1.333), with the former responsible for elongation
CC       and the latter for chain length control.
CC   -!- The cyclization domain of T. italicus cyclizes linear
CC       oligosaccharides with a degree of polymerization (DP) of 21 or higher
CC       to produce cyclic glucans with DP 17 or higher.
CC   -!- The cyclization domain also disproportionates linear beta-1,2-
CC       glucooligosaccharides without cycling.
CC   -!- The entire cyclic beta-1,2-glucan synthase from B. abortus
CC       synthesizes cyclic beta-1,2-glucans with DP 17-22.
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