RER1 family protein are involved in involved in the retrieval of some endoplasmic reticulum membrane proteins from the early golgi compartment. The C terminus of yeast Rer1p interacts with a coatomer complex [1].

1: Rer1p, a retrieval receptor for endoplasmic reticulum membrane proteins, is dynamically localized to the Golgi apparatus by coatomer. Sato K, Sato M, Nakano A; J Cell Biol 2001;152:935-944. PMID:11238450