Enables acetylcholine receptor activator activity and acetylcholine receptor binding activity. Acts upstream of or within acetylcholine receptor signaling pathway and desensitization of G protein-coupled receptor signaling pathway. Located in plasma membrane. Is expressed in embryo; liver; lung; metanephros; and testis. Orthologous to human LY6G6E (lymphocyte antigen 6 family member G6E). [provided by Alliance of Genome Resources, Apr 2022]