Munc18-Bound Syntaxin Readily Forms SNARE Complexes with Synaptobrevin in Native Plasma Membranes
2006
How Munc18-1 Helps Membrane Fusion
publication
Evidence: high
Author Information
Author(s): Felipe Zilly, Thorsten Lang
Hypothesis
How does Munc18-1 interact with syntaxin to promote SNARE complex formation?
Conclusion
The study reveals that Munc18-1 allows syntaxin to partially open, enabling it to interact with other SNARE proteins and form complexes necessary for membrane fusion.
Supporting Evidence
- Syntaxin must be able to close to bind Munc18-1.
- Adding synaptobrevin allows syntaxin to unbind from Munc18-1 and join the SNARE complex.
- SNAP-25 is essential for displacing Munc18-1 from syntaxin.
Takeaway
Munc18-1 helps a protein called syntaxin open up so it can work with other proteins to help cells release important substances.
Methodology
Experiments were performed using sheets of membrane prepared by disrupting cells to mimic the native biochemical environment.
Digital Object Identifier (DOI)
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