Predicted to enable identical protein binding activity. Acts upstream of or within positive regulation of glycogen (starch) synthase activity; positive regulation of glycogen biosynthetic process; and response to insulin. Located in cytoplasmic side of endoplasmic reticulum membrane and nucleus. Is expressed in embryo. Orthologous to human EPM2AIP1 (EPM2A interacting protein 1). [provided by Alliance of Genome Resources, Apr 2022]