UTP-glucose-1-phosphate uridylyltransferase is an enzyme associated with glycogenesis. It synthesizes UDP-glucose from glucose-1-phosphate and UTP; i.e., glucose-1-phosphate + UTP↔ UDP-glucose + pyrophosphate.http://www.creative-enzymes.com/product/Native-Bakers-Yeast-Uridine5diphosphoglucose-Pyrophosphorylase_1483.html