Acts as a glycogen-targeting subunit for phosphatase PP1. Facilitates interaction of the PP1 with enzymes of the glycogen metabolism and regulates its activity. Suppresses the rate at which PP1 dephosphorylates (inactivates) glycogen phosphorylase and enhances the rate at which it activates glycogen synthase and therefore limits glycogen breakdown. Its activity is inhibited by PYGL, resulting in inhibition of the glycogen synthase and glycogen phosphorylase phosphatase activities of PP1. Dramatically increases basal and insulin-stimulated glycogen synthesis upon overexpression in hepatocytes.
Hepatic glycogen-targeting protein phosphatase 1 regulatory subunit GL; hepatic glycogen-targeting subunit, G(L); PP1 subunit R4; PPP1R3B; PPP1R4; Protein phosphatase 1 regulatory subunit 3B; Protein phosphatase 1 regulatory subunit 4; Protein phosphatase 1 subunit GL; protein phosphatase 1, regulatory (inhibitor) subunit 3B; protein phosphatase 1, regulatory subunit 3B; PTG