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Structural analysis of conserved oligomeric Golgi complex subunit 2.

Lorraine F Cavanaugh1, Xiaocheng Chen, Brian C Richardson

  • 1Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544, USA.

The Journal of Biological Chemistry
|June 15, 2007
PubMed
Summary
This summary is machine-generated.

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The conserved oligomeric Golgi (COG) complex

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Structural Biology

Background:

  • The conserved oligomeric Golgi (COG) complex is crucial for retrograde vesicular transport within the Golgi apparatus.
  • Its precise mechanism of action, particularly in mediating vesicle-membrane contact, remains incompletely understood.
  • Other large multisubunit complexes, like the exocyst, also play roles in vesicle tethering.

Purpose of the Study:

  • To elucidate the structural basis of COG complex function.
  • To investigate the structural relationship between the COG complex and other vesicle tethering factors.

Main Methods:

  • Solution structure determination of a significant portion of yeast Cog2p.
  • Comparison of the obtained structure with existing crystal structures of exocyst subunits.

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Main Results:

  • The solution structure of a large part of yeast Cog2p was determined, revealing a six-helix bundle.
  • This structure shares general resemblance with crystal structures of exocyst subunits.
  • This provides the first structural evidence for helical bundle construction in the COG complex.

Conclusions:

  • The COG complex, similar to the exocyst, is likely assembled from helical bundles.
  • These structural motifs may serve as platforms for interactions with other key trafficking proteins, such as SNAREs and Rabs.
  • This finding offers insights into the molecular mechanisms of vesicular trafficking and tethering.