Acts probably as a receptor for selective autophagosomal degradation of ubiquitinated targets.
Subcellular locations: Cytoplasm, Cytoplasmic vesicle, Autophagosome, Lysosome, Cytoplasm, Myofibril, Sarcomere, M line
In cardiac muscles localizes to the sarcomeric M line (By similarity). Is targeted to lysosomes for degradation (By similarity).