Glycogen synthase
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Glycogen synthase is a glycosyltransferase enzyme (EC 2.4.1) that catalyses the reaction of UDP-glucose and (1,4-α-D-glucosyl)n to yield UDP and (1,4-α-D-glucosyl)n+1. In other words, this enzyme converts excess glucose residues one by one into a polymeric chain for storage as glycogen. The reaction is highly regulated by allosteric effectors such as glucose-6-phosphate, by phosphorylation reactions, and indirectly triggered by the hormone insulin.
Chemical name: UDP-glucose-glycogen glucosyltransferase (EC 2.4.1.11)