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Munc13 mediates the transition from the closed syntaxin-Munc18 complex to the SNARE complex.

Authors: Ma, C  Li, W  Xu, Y  Rizo, J 
Citation: Ma C, etal., Nat Struct Mol Biol. 2011 May;18(5):542-9. Epub 2011 Apr 17.
Pubmed: (View Article at PubMed) PMID:21499244
DOI: Full-text: DOI:10.1038/nsmb.2047

During the priming step that leaves synaptic vesicles ready for neurotransmitter release, the SNARE syntaxin-1 transitions from a closed conformation that binds Munc18-1 tightly to an open conformation within the highly stable SNARE complex. Control of this conformational transition is important for brain function, but the underlying mechanism is unknown. NMR and fluorescence experiments now show that the Munc13-1 MUN domain, which plays a central role in vesicle priming, markedly accelerates the transition from the syntaxin-1-Munc18-1 complex to the SNARE complex. This activity depends on weak interactions of the MUN domain with the syntaxin-1 SNARE motif, and probably with Munc18-1. Together with available physiological data, these results provide a defined molecular basis for synaptic vesicle priming, and they illustrate how weak protein-protein interactions can play crucial biological roles by promoting transitions between high-affinity macromolecular assemblies.


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CRRD Object Information
CRRD ID: 5686389
Created: 2012-01-20
Species: All species
Last Modified: 2012-01-20
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.