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COPI
COPI is a protein complex that coats vesicles transporting proteins from the ''cis'' end of the Golgi complex back to the rough endoplasmic reticulum (ER), where they were originally synthesized, and between Golgi compartments. This type of transport is termed as ''retrograde transport'', in contrast to the ''anterograde transport'' associated with the COPII protein. The name "COPI" refers to the specific coat protein complex that initiates the budding process on the cis-Golgi membrane. The coat consists of large protein subcomplexes that are made of seven different protein subunits.
==Coat proteins==
Coat protein, or COPI, is an ADP ribosylation factor (ARF)-dependent adaptor protein involved in membrane traffic. COPI was first identified in retrograde traffic from the cis-Golgi to the rough endoplasmic reticulum (ER) and is the most extensively studied of ARF-dependent adaptors. COPI consists of seven subunits which compose the heptameric protein complex.
The primary function of adaptors is the selection of cargo proteins for their incorporation into nascent carriers. In the case of the adaptor COPI, cargo containing the sorting motif KKXX interact with COPI to form carriers which are transported from the cis-Golgi to the rough ER. Current views suggest that ARFs are also involved in the selection of cargo for incorporation into carriers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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