Cycloisomaltooligosaccharide glucanotransferase

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Cycloisomaltooligosaccharide glucanotransferase (EC 2.4.1.248) is an enzyme that reshapes dextrans, which are glucose polymers with alpha-1,6 linkages. Its systematic name is (1->6)-alpha-D-glucan:(1->6)-alpha-D-glucan 6-alpha-D-(1->6alpha-D-glucano)-transferase (cyclizing). In simple terms, the enzyme transfers part of a dextran chain to another position in the same chain to form a cyclic glucan, producing cycloisomaltooligosaccharides instead of a longer linear dextran. It is specific for (1->6)-alpha-D-glucans (dextrans).