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Formation of a yeast SNARE complex is accompanied by significant structural changes
L M Rice1, P Brennwald, A T Brünger
1The Howard Hughes Medical Institute, and Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA.
FEBS Letters
|November 5, 1997
Summary
SNAP receptors (SNAREs) mediate vesicle fusion. Biophysical studies reveal that SNARE complex formation induces significant secondary structure and thermal stability, crucial for their function in membrane fusion.
Area of Science:
- Molecular Biology
- Biophysics
- Cell Biology
Background:
- SNARE proteins are essential for vesicle trafficking and membrane fusion.
- Understanding SNARE complex structure and dynamics is key to elucidating cellular transport mechanisms.
Purpose of the Study:
- To characterize the structural and energetic properties of yeast SNARE proteins (Snc1, Sso1, Sec9) and their complexes.
- To investigate the role of SNARE complex formation in inducing structural changes and stability.
Main Methods:
- Biophysical techniques were employed.
- Characterization of individual SNAREs and their complexes (Sso1:Sec9 and Sso1:Sec9:Snc1).
Main Results:
- Individual SNAREs (Snc1, Sso1, Sec9) were found to be monomeric.
- Sso1 exhibited significant secondary structure, while Snc1 and Sec9 were largely unstructured.
- Ternary SNARE complex formation (KD <50 nM) resulted in a >2-fold increase in secondary structure and enhanced thermal stability.
Conclusions:
- SNARE complex formation induces significant structural changes and increases thermal stability.
- These conserved properties are likely critical for the SNAREs' role in vesicle docking and fusion.
- The findings provide insights into the molecular mechanisms of membrane fusion.