Involved in transport of proteins from the cis/medial-Golgi to the trans-Golgi network.
Golgi apparatus, cis-Golgi network membrane ; Single-pass type IV membrane protein . Golgi apparatus membrane . Endoplasmic reticulum membrane . Concentrated most in the intermediate compartment/cis-Golgi network and the cis-Golgi cisternae 1 and 2. Greatly reduced in concentration at the trans end of the Golgi apparatus. .