Adapter protein involved in invadopodia and podosome formation and extracellular matrix degradation. The PX domain is required for podosome localization because of its ability to bind phosphatidylinositol 3-phosphate (PtdIns(3)P) and phosphatidylinositol 3,4-bisphosphate (PtdIns(3,4)P2) and, to a lesser extent, phosphatidylinositol 4-phosphate (PtdIns(4)P), phosphatidylinositol 5-phosphate (PtdIns(5)P), and phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2). Binds to the third intramolecular SH3 domain (By similarity). Tyrosine phosphorylated. Belongs to the SH3PXD2 family.