Plays a role in rod outer segment (ROS) morphogenesis (By similarity). May play a role with PRPH2 in the maintenance of the structure of ROS curved disks (By similarity). Plays a role in the organization of the ROS and maintenance of ROS disk diameter (By similarity). Involved in the maintenance of the retina outer nuclear layer (By similarity). Homodimer; disulfide-linked (By similarity). Forms a homotetramer (By similarity). Forms a heterotetramer with PRPH2 (By similarity). Homotetramer and heterotetramer core complexes go on to form higher order complexes by formation of intermolecular disulfide bonds (By similarity). Interacts with STX3 (By similarity). Interacts with SNAP25 (By similarity). Belongs to the PRPH2/ROM1 family.