Implicated in endocytosis. In a first step mediates neck formation during ultrafast endocytosis and function at a second step to aid in the removal of clathrin coats from the regenerated vesicles (By similarity). May recruit other proteins to membranes with high curvature (By similarity). . This is the function of Ensembl gene identifier ENSG00000141985 (SH3GL1, SH3 domain containing GRB2 like 1, endophilin A2).