May function in clathrin-mediated endocytosis. Has both a membrane binding/tubulating activity and the ability to recruit proteins essential to the formation of functional clathrin-coated pits. Has a preference for membranes enriched in phosphatidylserine and phosphoinositides and is required for the endocytosis of the transferrin receptor. May also bind tubulin. May play a role in the regulation of energy homeostasis. Interacts with proteins essential or regulating the formation of functional clathrin-coated pits (Probable). Interacts with CANX (By similarity). Interacts with AP2A1 (By similarity). Interacts with EPS15 (By similarity). Interacts with SH3GL3 (By similarity). Interacts with AMPH (By similarity). Interacts with ITSN1 (via SH3 domains) (By similarity). Interacts with and REPS1 (By similarity). Specifically expressed in brain (at protein level).