Component of adherens-type cell-cell and cell-matrix junctions. Has no phosphoglucomutase activity in vitro. Interacts with DMD/dystrophin; the interaction is direct (PubMed:7890770). Interacts with UTRN/utrophin (By similarity). Concentrated in focal contacts at the ends of actin bundles, and associated with actin filaments. Belongs to the phosphohexose mutase family.