Enables protein phosphatase binding activity. Acts upstream of or within glycogen biosynthetic process. Predicted to be located in glycogen granule and intracellular membrane-bounded organelle. Predicted to be part of protein phosphatase type 1 complex. Is expressed in genitourinary system; liver; and nasal capsule. Used to study type 2 diabetes mellitus. Orthologous to human PPP1R3C (protein phosphatase 1 regulatory subunit 3C). [provided by Alliance of Genome Resources, Apr 2022]