6A30 image
Deposition Date 2018-06-14
Release Date 2019-01-30
Last Version Date 2023-11-22
Entry Detail
PDB ID:
6A30
Keywords:
Title:
Crystal Structure of Munc13-1 MUN Domain and Synaptobrevin-2 Juxtamembrane Linker Region
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.79 Å
R-Value Free:
0.23
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Protein unc-13 homolog A
Gene (Uniprot):Unc13a
Chain IDs:A
Chain Length:537
Number of Molecules:1
Biological Source:Rattus norvegicus
Polymer Type:polypeptide(L)
Molecule:Synaptobrevin-2 juxtamembrane linker peptide
Gene (Uniprot):Vamp2
Chain IDs:B (auth: P)
Chain Length:6
Number of Molecules:1
Biological Source:Rattus norvegicus
Primary Citation
Munc18 and Munc13 serve as a functional template to orchestrate neuronal SNARE complex assembly.
Nat Commun 10 69 69 (2019)
PMID: 30622273 DOI: 10.1038/s41467-018-08028-6

Abstact

The transition of the Munc18-1/syntaxin-1 complex to the SNARE complex, a key step involved in exocytosis, is regulated by Munc13-1, SNAP-25 and synaptobrevin-2, but the underlying mechanism remains elusive. Here, we identify an interaction between Munc13-1 and the membrane-proximal linker region of synaptobrevin-2, and reveal its essential role in transition and exocytosis. Upon this interaction, Munc13-1 not only recruits synaptobrevin-2-embedded vesicles to the target membrane but also renders the synaptobrevin-2 SNARE motif more accessible to the Munc18-1/syntaxin-1 complex. Afterward, the entry of SNAP-25 leads to a half-zippered SNARE assembly, which eventually dissociates the Munc18-1/syntaxin-1 complex to complete SNARE complex formation. Our data suggest that Munc18-1 and Munc13-1 together serve as a functional template to orchestrate SNARE complex assembly.

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