Several ADP-ribosylation Factor (Arf) Isoforms Support COPI Vesicle Formation

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2011 Aug 17

PMID 21844198

Citations 34

Authors

Vincent Popoff

Julian D Langer

Ingeborg Reckmann

Andrea Hellwig

Richard A Kahn

Britta Brugger

Felix T Wieland

Affiliations

Soon will be listed here.

Abstract

Newly synthesized proteins and lipids are transported in vesicular carriers along the secretory pathway. Arfs (ADP-ribosylation factors), a family of highly conserved GTPases within the Ras superfamily, control recruitment of molecular coats to membranes, the initial step of coated vesicle biogenesis. Arf1 and coatomer constitute the minimal cytosolic machinery leading to COPI vesicle formation from Golgi membranes. Although some functional redundancies have been suggested, other Arf isoforms have been poorly analyzed in this context. In this study, we found that Arf1, Arf4, and Arf5, but not Arf3 and Arf6, associate with COPI vesicles generated in vitro from Golgi membranes and purified cytosol. Using recombinant myristoylated proteins, we show that Arf1, Arf4, and Arf5 each support COPI vesicle formation individually. Unexpectedly, we found that Arf3 could also mediate vesicle biogenesis. However, Arf3 was excluded from the vesicle fraction in the presence of the other isoforms, highlighting a functional competition between the different Arf members.

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