Enables acetylcholine receptor regulator activity. Involved in chaperone-mediated protein complex assembly and positive regulation of protein localization to cell surface. Located in endoplasmic reticulum. Is expressed in adrenal gland; maturing glomerular tuft; nervous system; neural retina; and testis. Orthologous to human TMEM35A (transmembrane protein 35A). [provided by Alliance of Genome Resources, Apr 2022]