May play a role in regulation of a variety of G-protein coupled receptors. Interacts with cytoplasmic tails of a variety of G-protein coupled receptors such as muscarinic acetylcholine receptor M1/CHRM1 and calcitonin receptor/CALCR. Strongly expressed in the brain and the cochlea. Also in lung and muscle tissues. Localized in multiple structures of the cochlea, detected in the spiral ganglion, stria vascularis, spiral ligament, inner and outer hair cells. Belongs to the GPRASP family.