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First published online May 24, 2006
doi: 10.1242/10.1242/jcs.03019

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The ER-Golgi intermediate compartment (ERGIC): in search of its identity and function

Christian Appenzeller-Herzog^* and Hans-Peter Hauri

Biozentrum, University of Basel, Klingelbergstrasse 70, CH-4056 Basel, Switzerland

Author for correspondence (e-mail: Hans-Peter.Hauri{at}unibas.ch)

Accepted 18 April 2006

Protein traffic moving from the endoplasmic reticulum (ER) to the Golgi complex in mammalian cells passes through the tubulovesicular membrane clusters of the ER-Golgi intermediate compartment (ERGIC), the marker of which is the lectin ERGIC-53. The dynamic nature and functional role of the ERGIC have been debated for quite some time. In the most popular current view, the ERGIC clusters are mobile transport complexes that deliver secretory cargo from ER-exit sites to the Golgi. Recent live-cell imaging data revealing the formation of anterograde carriers from stationary ERGIC-53-positive membranes, however, suggest a stable compartment model in which ER-derived cargo is first shuttled from ER-exit sites to stationary ERGIC clusters in a COPII-dependent step and subsequently to the Golgi in a second vesicular transport step. This model can better accommodate previous morphological and functional data on ER-to-Golgi traffic. Such a stationary ERGIC would be a major site of anterograde and retrograde sorting that is controlled by coat proteins, Rab and Arf GTPases, as well as tethering complexes, SNAREs and cytoskeletal networks. The ERGIC also contributes to the concentration, folding, and quality control of newly synthesized proteins.

Key words: ER-exit sites, ER-to-Golgi transport, ERGIC-53, Protein sorting, COPI, COPII, Tethering, Fusion

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