Involved in G protein-coupled receptors (GPCRs) trafficking from the endoplasmic reticulum to the cell surface; it promotes the exit of GPCRs from the early secretory pathway, likely through interaction with the COPII machinery. Interacts with Sec23/24 complex components SEC24B and SEC24D (By similarity). Interacts with CCR5 (By similarity). Interacts with ADRB2 in the early secretory pathway (By similarity). Belongs to the cornichon family.