Predicted to enable ER retention sequence binding activity. Involved in IRE1-mediated unfolded protein response. Predicted to be located in cis-Golgi network and endoplasmic reticulum. Expressed in head and tail. Human ortholog(s) of this gene implicated in osteogenesis imperfecta type 21. Is an ortholog of human KDELR2 (KDEL endoplasmic reticulum protein retention receptor 2).