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Published online 17 December 2001. doi:10.1083/jcb.200108017
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© The Rockefeller University Press, 0021-9525/2001/12/1199 $5.00
The Journal of Cell Biology, Volume 155, Number 7, December 24, 2001 1199-1212


Article

Sorting of Golgi resident proteins into different subpopulations of COPI vesicles : a role for ArfGAP1



Joel Lanoix1, Joke Ouwendijk1, Annika Stark1, Edith Szafer2, Dan Cassel2, Kurt Dejgaard1, Matthias Weiss1 and Tommy Nilsson1

1 Cell Biology and Biophysics Programme, European Molecular Biology Laboratory, D-69017 Heidelberg, Germany
2 Department of Biology, Technion, Haifa 32000, Israel

Address correspondence to Tommy Nilsson, Cell Biology and Biophysics Programme, EMBL, D-69017 Heidelberg, Germany. Tel.: 49-6221-387-294. Fax: 49-6221-387-306. E-mail: nilsson{at}embl-heidelberg.de

We present evidence for two subpopulations of coatomer protein I vesicles, both containing high amounts of Golgi resident proteins but only minor amounts of anterograde cargo. Early Golgi proteins p24{alpha}2, ß1, {delta}1, and {gamma}3 are shown to be sorted together into vesicles that are distinct from those containing mannosidase II, a glycosidase of the medial Golgi stack, and GS28, a SNARE protein of the Golgi stack. Sorting into each vesicle population is Arf-1 and GTP hydrolysis dependent and is inhibited by aluminum and beryllium fluoride. Using synthetic peptides, we find that the cytoplasmic domain of p24ß1 can bind Arf GTPase-activating protein (GAP)1 and cause direct inhibition of ArfGAP1-mediated GTP hydrolysis on Arf-1 bound to liposomes and Golgi membranes. We propose a two-stage reaction to explain how GTP hydrolysis constitutes a prerequisite for sorting of resident proteins, yet becomes inhibited in their presence.

Key Words: Golgi; COPI; recycling; p24 proteins; ArfGAP1


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