Protein phosphatase 1 regulatory subunit 3C (PPP1R3C, PTG) binds to glycogen particles containing GYG1 (glycogenin 1) and GYS1 (glycogen synthase 1). PPP1R3C appears to function as a scaffolding protein to mediate association of other proteins with glycogen granules and to promote the synthesis of glycogen (Worby et al. 2008).
