Coatomer subunit beta (COPB1)

Coatomer complex is required for budding from Golgi membranes, and is essential for the retrograde Golgi-to-ER transport of dilysine-tagged proteins. In mammals, the coatomer can only be recruited by membranes associated to ADP-ribosylation factors (ARFs), which are small GTP-binding proteins; the complex also influences the Golgi structural integrity, as well as the processing, activity, and endocytic recycling of LDL receptors.

Plays a practical role in facilitating the transport of kappa- type opioid receptor mRNAs to axons and enhances translation of these proteins. Required for limiting lipid storage in lipid droplets.