Recruits HSPA8/HSC70 to clathrin-coated vesicles and promotes uncoating of clathrin-coated vesicles. Plays a role in clathrin-mediated endocytosis in neurons. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Interacts with HSPA8/HSC70. Interacts with CLTC. Interacts with AP2A2 (By similarity). Mice have a high rate of early postnatal mortality, although surviving pups have a normal life span despite decreased body weight. Knockout animals have impaired synaptic vesicle recycling, with an increased number of clathrin-coated vesicles, and impaired clathrin-mediated endocytosis of synaptic vesicles in neuronal culture. There is an up-regulation of Gak, but this does not fully compensate for the lack of the protein. The brains from mutant mice do not display alterations in substantia nigra morphology or dopamine transporter abundance or distribution, in agreement with the lack of gait or movement abnormalities in the mutant animals. Extended N-terminus.