Acts as an adapter for the myotubularin-related phosphatases. Regulates phosphatase MTM1 protein stability and possibly its intracellular location. By stabilizing MTM1 protein levels, required for skeletal muscle maintenance but not for myogenesis.
Subcellular locations: Cytoplasm, Sarcoplasmic reticulum, Cytoplasm, Myofibril, Sarcomere
Localizes to punctate vesicles when associated with MTM1 (By similarity). Localizes to triads, a structure formed by a T tubule and two sarcoplasmic reticulum terminal cisterna. In skeletal muscles, co-localizes with MTM1 in the sarcomere. Partially localizes to the sarcoplasmic reticulum in skeletal muscles (By similarity).