Predicted to enable identical protein binding activity. Involved in neurotransmitter receptor transport, endosome to postsynaptic membrane; regulation of intracellular transport; and regulation of modification of synaptic structure. Located in postsynaptic recycling endosome. Is active in glutamatergic synapse. Is extrinsic component of postsynaptic early endosome membrane. Orthologous to human GRIPAP1 (GRIP1 associated protein 1). [provided by Alliance of Genome Resources, Apr 2022]