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Structure paper

TitleThe structure of a COPII tubule.
Journal, issue, pagesJ Struct Biol, Vol. 173, Issue 2, Page 358-364, Year 2011
Publish dateSep 7, 2010
AuthorsJason O'Donnell / Kerry Maddox / Scott Stagg /
PubMed AbstractNearly a third of all eukaryotic proteins are transported from the ER to the Golgi apparatus through the secretory pathway using COPII coated vesicles. Evidence suggests that this transport occurs ...Nearly a third of all eukaryotic proteins are transported from the ER to the Golgi apparatus through the secretory pathway using COPII coated vesicles. Evidence suggests that this transport occurs via 500-900 Å vesicles that bud from the ER membrane. It has been shown that procollagen molecules utilize the COPII proteins for transport, but it is unclear how the COPII coat can accommodate these ∼3000 Å long molecules. We now present a cryogenic electron tomographic reconstruction of a Sec13/31 tubule that is approximately 3300 Å long containing a hollow cylindrical interior that is 300 Å in diameter, dimensions that are consistent with those that are required to encapsulate a procollagen molecule wrapped in a membrane and accessory COPII components. This structure suggests a novel mechanism that the COPII coat may employ to transport elongated cargo.
External linksJ Struct Biol / PubMed:20828620
MethodsEM (tomography) / EM (subtomogram averaging)
Resolution85.0 Å
Structure data

EMDB-1784:
The Structure of a COPII Tubule
Method: EM (tomography) / Resolution: 85.0 Å

EMDB-1785:
The Structure of a COPII Tubule
Method: EM (subtomogram averaging) / Resolution: 85.0 Å

EMDB-1786:
The subvolume averaged map of a Sec13-31 Tubule
Method: EM (subtomogram averaging) / Resolution: 85.0 Å

Source
  • Homo sapiens (human)

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