Adapter protein involved in invadopodia and podosome formation, extracellular matrix degradation and invasiveness of some cancer cells (PubMed:27789576). 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. In association with ADAM12, mediates the neurotoxic effect of amyloid-beta peptide. {ECO:0000269|PubMed:12615925, ECO:0000269|PubMed:15710328, ECO:0000269|PubMed:15710903, ECO:0000269|PubMed:19755710, ECO:0000269|PubMed:20609497, ECO:0000269|PubMed:27789576}. This is the function of ENSG00000107957 (SH3PXD2A, SH3 and PX domains 2A).