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Related Experiment Videos

A partially zipped SNARE complex stabilized by the membrane.

Yinghui Zhang1, Zengliu Su, Fan Zhang

  • 1Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, Iowa 50011, USA.

The Journal of Biological Chemistry
|February 17, 2005
PubMed
Summary

Yeast SNARE complex assembly, crucial for membrane fusion, shows a partially zipped core in proteoliposomes. Complete core formation is necessary for fusion, suggesting a role in geometric setup rather than energy release.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • The SNARE complex is central to intracellular membrane fusion, a vital process for vesicular transport.
  • Vesicle-associated (v-) SNARE and target membrane (t-) SNARE proteins associate to form a coiled-coil core, bridging two membranes.

Purpose of the Study:

  • To investigate the structure of the SNARE complex assembled by yeast t-SNAREs (Sso1p/Sec9) and v-SNARE (Snc2p) using Electron Paramagnetic Resonance (EPR).
  • To understand the role of SNARE complex formation in the energy dynamics and geometric requirements for membrane fusion.

Main Methods:

  • Electron Paramagnetic Resonance (EPR) spectroscopy was used to study SNARE complex structure in detergent solutions and reconstituted proteoliposomes.
  • Proteoliposome fusion assays with cysteine- and nitroxide-scanning mutants of Sso1p were employed.

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Main Results:

  • In detergent solutions, yeast SNAREs formed a fully assembled core.
  • In proteoliposomes, a partially zipped core (structured N-terminus, frayed C-terminus) was detected, coexisting with the fully assembled complex.
  • Complete core formation was found to be essential for membrane fusion, indicating a role in geometric arrangement.

Conclusions:

  • Yeast SNARE core complex formation may not be the direct energy source for fusion, differing from neuronal SNAREs.
  • Complete SNARE core assembly is required for successful membrane fusion, likely by establishing the correct lipid-protein complex geometry.