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Bidirectional Transport by Distinct Populations of COPI-Coated Vesicles
Journal article   Open access   Peer reviewed

Bidirectional Transport by Distinct Populations of COPI-Coated Vesicles

Lelio Orci, Mark Stamnes, Mariella Ravazzola, Mylène Amherdt, Alain Perrelet, Thomas H Söllner and James E Rothman
Cell, Vol.90(2), pp.335-349
1997
DOI: 10.1016/S0092-8674(00)80341-4
PMID: 9244307
url
https://doi.org/10.1016/S0092-8674(00)80341-4View
Published (Version of record) Open Access

Abstract

Electron microscope immunocytochemistry reveals that both anterograde-directed (proinsulin and VSV G protein) and retrograde-directed (the KDEL receptor) cargo are present in COPI-coated vesicles budding from every level of the Golgi stack in whole cells; however, they comprise two distinct populations that together can account for at least 80% of the vesicles budding from Golgi cisternae. Segregation of anterograde- from retrograde-directed cargo into distinct sets of COPI-coated vesicles is faithfully reproduced in the cell-free Golgi transport system, in which VSV G protein and KDEL receptor are packaged into separable vesicles, even when budding is driven by highly purified coatomer and a recombinant ARF protein.

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