Adapter protein involved in invadopodia and podosome formation and extracellular matrix degradation. Binds matrix metalloproteinases (ADAMs), NADPH oxidases (NOXs) and phosphoinositides. Acts as an organizer protein that allows NOX1- or NOX3-dependent reactive oxygen species (ROS) generation and ROS localization. Plays a role in mitotic clonal expansion during the immediate early stage of adipocyte differentiation (By similarity). Interacts with ADAM15 (By similarity). Interacts with NOXO1. Interacts (via SH3 domains) with NOXA1; the interaction is direct. Interacts with FASLG. Cytoplasmic in normal cells and localizes to podosomes in SRC-transformed cells. Expressed in fibroblasts. 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). Phosphorylated in SRC-transformed cells. The disease is caused by variants affecting the gene represented in this entry. Belongs to the SH3PXD2 family.