Functions in an early step of clathrin-mediated endocytosis . Has both a membrane binding/bending activity and the ability to recruit proteins essential to the formation of functional clathrin-coated pits. May regulate Bmp signaling by regulating clathrin-mediated endocytosis of Bmp receptors. Involved in the regulation of T-cell poliferation and activation (, ). Affects TCR clustering upon receptor triggering and modulates its internalisation, playing a role in TCR-dependent T-cell activation .
Subcellular locations: Membrane, Clathrin-coated pit
Associated with forming but not mature clathrin-coated vesicles. The recruitment to coated-pits precede the one of clathrin and the adaptor protein complex AP-2. According to  it may also dynamically associate with Golgi/TGN membranes.
Predominantly expressed in lymphoid cells.