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The membrane-dipped neuronal SNARE complex: a site-directed spin labeling electron paramagnetic resonance study
Dae-Hyuk Kweon1, Chang Sup Kim, Yeon-Kyun Shin
1Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, Iowa 50011, USA.
Biochemistry
|July 18, 2002
Summary
The soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) complex is crucial for membrane fusion. This study shows the SNARE complex inserts into membranes, potentially facilitating fusion and neurotransmitter release.
Area of Science:
- Molecular Biology
- Neuroscience
- Biophysics
Background:
- The soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) complex is vital for membrane fusion and neurotransmitter release.
- Understanding the membrane topology of the SNARE complex is essential for elucidating its function.
Purpose of the Study:
- To investigate the membrane topology of the SNARE complex at the membrane-water interface.
- To determine how the SNARE complex interacts with lipid bilayers.
Main Methods:
- Site-specific spin labeling electron paramagnetic resonance (EPR) spectroscopy was employed.
- Residues at the membrane-water interface of the SNARE complex were analyzed.
Main Results:
- EPR analysis revealed that the basic amino acid-rich interfacial region of transmembrane SNARE proteins inserts into the membrane.
- This insertion eliminates the gap between the SNARE core complex and the membrane.
Conclusions:
- SNARE complex formation directly leads to the apposition of two membranes.
- This direct apposition may facilitate the membrane fusion process, crucial for neuronal function.