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Related Experiment Videos

Cargo selection into COPII vesicles is driven by the Sec24p subunit.

Elizabeth Miller1, Bruno Antonny, Susan Hamamoto

  • 1Department of Molecular and Cell Biology and Howard Hughes Medical Institute, University of California, Berkeley, CA 94720-3202, USA.

The EMBO Journal
|November 12, 2002
PubMed
Summary
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The COPII coat complex transports proteins from the endoplasmic reticulum. Lst1p, a COPII subunit, is crucial for selecting specific cargo, like SNAREs, for vesicle transport, ensuring proper Golgi fusion.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Protein Transport

Background:

  • Endoplasmic reticulum (ER) protein export relies on COPII-coated vesicles.
  • Cargo selection by the COPII coat is critical for vesicular transport.

Purpose of the Study:

  • Investigate the functional role of Lst1p, a Sec24p homolog, in COPII vesicle cargo selection.
  • Determine how Lst1p contributes to the recruitment of specific cargo molecules.

Main Methods:

  • Studied Lst1p function on native ER membranes and synthetic liposomes.
  • Generated COPII vesicles with and without Sec24p.
  • Assessed vesicle cargo content and fusion capacity with Golgi membranes.
  • Performed in vitro binding assays between Lst1p and cargo proteins.

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Main Results:

  • Lst1p functions as a COPII subunit independently of Sec24p.
  • Vesicles lacking Sec24p are deficient in specific cargo, including SNAREs (Bet1p, Bos1p, Sec22p).
  • These vesicles exhibit impaired fusion with Golgi membranes.
  • Lst1p does not bind Bet1p in vitro, unlike Sec24p.

Conclusions:

  • Lst1p plays a role in COPII vesicle formation but is not solely responsible for cargo selection.
  • Sec24p is the primary determinant for discriminating and recruiting specific cargo molecules into COPII vesicles.
  • Efficient cargo binding by Sec24p is essential for proper vesicle function and subsequent membrane fusion events.