Predicted to enable alpha-1,4-glucan glucosyltransferase (UDP-glucose donor) activity. Predicted to be involved in glycogen biosynthetic process and response to glucose. Predicted to be located in cortical actin cytoskeleton and cytosol. Predicted to be active in cytoplasm. Is expressed in hepatocyte; liver; male organism; and muscle. Human ortholog(s) of this gene implicated in glycogen storage disease. Orthologous to human GYS2 (glycogen synthase 2).