Multibudded tubules formed by COPII on artificial liposomes

Kirsten Bacia, Eugene Futai, Simone Prinz, Annette Meister, Sebastian Daum, Daniela Glatte, John A.G. Briggs, Randy Schekman

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)


COPII-coated vesicles form at the endoplasmic reticulum for cargo transport to the Golgi apparatus. We used in vitro reconstitution to examine the roles of the COPII scaffold in remodeling the shape of a lipid bilayer. Giant Unilamellar Vesicles were examined using fast confocal fluorescence and cryo-electron microscopy in order to avoid separation steps and minimize mechanical manipulation. COPII showed a preference for high curvature structures, but also sufficient flexibility for binding to low curvatures. The COPII proteins induced beads-on-a-string-like constricted tubules, similar to those previously observed in cells. We speculate about a mechanical pathway for vesicle fission from these multibudded COPII-coated tubules, considering the possibility that withdrawal of the Sar1 amphipathic helix upon GTP hydrolysis leads to lipid bilayer destabilization resulting in fission.

Original languageEnglish
Article number17
JournalScientific Reports
Publication statusPublished - 2011


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