Acts as a cargo receptor for glycogen. Delivers its cargo to an autophagic pathway called glycophagy, resulting in the transport of glycogen to lysosomes.
Subcellular locations: Preautophagosomal structure membrane, Endoplasmic reticulum membrane, Cell membrane, Sarcolemma, T-tubule
Also detected near the junctional sarcoplasmic reticulum . Concentrates at perinuclear structures .
Expressed at high level in skeletal and cardiac muscles. Moderately expressed in liver and placenta. No expression is found in pancreas, kidney or lung. Present in skeletal muscle, heart and placenta (at protein level).