Cycloisomaltooligosaccharide glucanotransferase (EC 2.4.1.248) is an enzyme with systematic name (1->6)-alpha-D-glucan:(1->6)-alpha-D-glucan 6-alpha-D-(1->6alpha-D-glucano)-transferase (cyclizing). This enzyme catalyses the following chemical reaction Cycloisomaltooligosaccharide glucanotransferase (EC 2.4.1.248) is an enzyme with systematic name (1->6)-alpha-D-glucan:(1->6)-alpha-D-glucan 6-alpha-D-(1->6alpha-D-glucano)-transferase (cyclizing). This enzyme catalyses the following chemical reaction This enzyme is specific for (1->6)-alpha-D-glucans (dextrans).