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Making COPII coats.

Tomas Kirchhausen1

  • 1Department of Cell Biology, Harvard Medical School, Boston, MA 02115-5701, USA. kirchhausen@crystal.harvard.edu

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Researchers revealed the structure of the yeast Sec13/31 complex, essential for COPII-coated vesicle formation. This finding explains how the COPII cage assembles to transport proteins from the endoplasmic reticulum.

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Area of Science:

  • Cell biology
  • Structural biology
  • Molecular mechanisms

Background:

  • Newly synthesized proteins are transported from the endoplasmic reticulum (ER) to the Golgi apparatus via COPII-coated vesicles.
  • The COPII coat is a protein complex responsible for vesicle budding from the ER membrane.
  • The Sec13/31 complex forms the outer lattice or 'cage' of the COPII coat.

Discussion:

  • Fath et al. determined the structure of a significant part of the yeast Sec13/31 complex.
  • This structural information provides insights into the assembly of the COPII coat framework.
  • The study proposes a model for how the COPII cage is built and how it can adapt to different cargo sizes.

Key Insights:

  • The structure of the yeast Sec13/31 complex has been elucidated.
  • A mechanism for COPII cage assembly is suggested.
  • The findings explain how the COPII coat accommodates varying cargo sizes during ER export.

Outlook:

  • Further structural studies of COPII components could reveal more about vesicle formation.
  • Understanding COPII assembly may aid in manipulating protein transport pathways.
  • This research contributes to the fundamental knowledge of intracellular protein trafficking.