Enables microtubule binding activity and phospholipid binding activity. Acts upstream of or within plasma membrane tubulation and positive regulation of receptor-mediated endocytosis. Located in clathrin-coated vesicle and plasma membrane. Part of AP-2 adaptor complex. Is expressed in central nervous system; metanephros; small intestine; and testis. Orthologous to human SGIP1 (SH3GL interacting endocytic adaptor 1). [provided by Alliance of Genome Resources, Apr 2022]