Enables identical protein binding activity; phosphatidylinositol-4,5-bisphosphate binding activity; and phosphatidylserine binding activity. Involved in membrane invagination; protein localization to plasma membrane; and synaptic vesicle endocytosis. Located in clathrin-coated pit and clathrin-coated vesicle. Is expressed in endolymphatic appendage and head. Orthologous to human FCHO2 (FCH and mu domain containing endocytic adaptor 2). [provided by Alliance of Genome Resources, Apr 2022]