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Updated: Jan 30, 2026
09:19
Analysis of SNARE-mediated Membrane Fusion Using an Enzymatic Cell Fusion Assay
Published on: October 19, 2012
14.4K
SNARE machinery is optimized for ultrafast fusion
Fabio Manca1,2,3,4, Frederic Pincet1,2,3,4, Lev Truskinovsky5
1Laboratoire de Physique de l'Ecole Normale Supérieure (LPENS), CNRS, Ecole Normale Supérieure, 75005 Paris, France.
Summary
Cooperative action of multiple SNAREpins (soluble NSF attachment protein receptors) drives ultrafast vesicle fusion. A minimum of three SNAREpins are required, with an optimal range of three to six for sub-millisecond fusion.
Area of Science:
- Molecular Biology
- Biophysics
- Cell Biology
Background:
- SNARE proteins (SNAREpins) mediate vesicle fusion, a critical biological process.
- Individual SNAREpins are slow, taking ~1 second for bilayer fusion.
- Synaptic vesicle fusion, however, occurs much faster (~0.1 ms).
Purpose of the Study:
- To investigate the mechanism behind ultrafast vesicle fusion.
- To determine the cooperative role of multiple SNAREpins in rapid fusion.
- To identify the optimal number of SNAREpins for sub-millisecond fusion.
Main Methods:
- Development of a coarse-grained biophysical model.
- Analysis of mechanical interactions and energy landscapes of SNAREpin complexes.
- Incorporation of experimentally observed metastable states.
Main Results:
- Cooperative action of at least three SNAREpins is necessary for fusion under 1 ms.
- Mechanical synchronization of SNAREpins is required to reach the prefusion state.
- An optimal range of three to six SNAREpins predicts sub-millisecond fusion.
Conclusions:
- Ultrafast vesicle fusion relies on the cooperative, synchronized action of multiple SNAREpins.
- The predicted optimal number of SNAREpins (3-6) aligns with recent experimental findings.
- This study provides a mechanistic explanation for the speed of synaptic vesicle release.
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