Involved in the secretion of glycoproteins and in nucleus architecture and gene silencing. Required for the endoplasmic reticulum exit of EMP46. Homooligomers. Interacts with EMP46 in the endoplasmic reticulum membrane. Interacts with the coatomer proteins COP1, SEC21 and SEC23. The di-lysine motif confers endoplasmic reticulum localization for type I membrane proteins. Present with 2900 molecules/cell in log phase SD medium. Belongs to the EMP46/EMP47 family.