Predicted to enable clathrin adaptor activity; phospholipid binding activity; and transmembrane transporter binding activity. Acts upstream of or within several processes, including Notch signaling pathway; female pregnancy; and in utero embryonic development. Predicted to be located in cytosol; nucleus; and presynapse. Predicted to be extrinsic component of cytoplasmic side of plasma membrane; extrinsic component of postsynaptic membrane; and extrinsic component of presynaptic membrane. Predicted to be part of clathrin vesicle coat. Predicted to be active in endosome and plasma membrane. Orthologous to human EPN1 (epsin 1). [provided by Alliance of Genome Resources, Apr 2022]