Abstract:
:Proteins essential for vesicle formation by the Coat Protein I (COPI) complex are being identified, but less is known about the role of specific lipids. Brefeldin-A ADP-ribosylated substrate (BARS) functions in the fission step of COPI vesicle formation. Here, we show that BARS induces membrane curvature in cooperation with phosphatidic acid. This finding has allowed us to further delineate COPI vesicle fission into two sub-stages: 1) an earlier stage of bud-neck constriction, in which BARS and other COPI components are required, and 2) a later stage of bud-neck scission, in which phosphatidic acid generated by phospholipase D2 (PLD2) is also required. Moreover, in contrast to the disruption of the Golgi seen on perturbing the core COPI components (such as coatomer), inhibition of PLD2 causes milder disruptions, suggesting that such COPI components have additional roles in maintaining Golgi structure other than through COPI vesicle formation.
journal_name
Nat Cell Bioljournal_title
Nature cell biologyauthors
Yang JS,Gad H,Lee SY,Mironov A,Zhang L,Beznoussenko GV,Valente C,Turacchio G,Bonsra AN,Du G,Baldanzi G,Graziani A,Bourgoin S,Frohman MA,Luini A,Hsu VWdoi
10.1038/ncb1774subject
Has Abstractpub_date
2008-10-01 00:00:00pages
1146-53issue
10eissn
1465-7392issn
1476-4679pii
ncb1774journal_volume
10pub_type
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