4Y21

Crystal Structure of Munc13-1 MUN domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.218 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history

Re-refinement Note

A newer entry is available that reflects an alternative modeling of the original data: 5UF7


Literature

Syntaxin opening by the MUN domain underlies the function of Munc13 in synaptic-vesicle priming.

Yang, X.Wang, S.Sheng, Y.Zhang, M.Zou, W.Wu, L.Kang, L.Rizo, J.Zhang, R.Xu, T.Ma, C.

(2015) Nat Struct Mol Biol 22: 547-554

  • DOI: 10.1038/nsmb.3038
  • Primary Citation of Related Structures:  
    4Y21

  • PubMed Abstract: 
  • UNC-13-Munc13s have a central function in synaptic-vesicle priming through their MUN domains. However, it is unclear whether this function arises from the ability of the MUN domain to mediate the transition from the Munc18-1-closed syntaxin-1 complex to the SNARE complex in vitro ...

    UNC-13-Munc13s have a central function in synaptic-vesicle priming through their MUN domains. However, it is unclear whether this function arises from the ability of the MUN domain to mediate the transition from the Munc18-1-closed syntaxin-1 complex to the SNARE complex in vitro. The crystal structure of the rat Munc13-1 MUN domain now reveals an elongated, arch-shaped architecture formed by α-helical bundles, with a highly conserved hydrophobic pocket in the middle. Mutation of two residues (NF) in this pocket abolishes the stimulation caused by the Munc13-1 MUN domain on SNARE-complex assembly and on SNARE-dependent proteoliposome fusion in vitro. Moreover, the same mutation in UNC-13 abrogates synaptic-vesicle priming in Caenorhabditis elegans neuromuscular junctions. These results support the notion that orchestration of syntaxin-1 opening and SNARE-complex assembly underlies the central role of UNC-13-Munc13s in synaptic-vesicle priming.


    Organizational Affiliation

    Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein unc-13 homolog AA539Rattus norvegicusMutation(s): 0 
Gene Names: Unc13aUnc13h1
Find proteins for Q62768 (Rattus norvegicus)
Explore Q62768 
Go to UniProtKB:  Q62768
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.218 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114.062α = 90
b = 270.921β = 90
c = 47.735γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation of ChinaChina31370819
National Key Basic Research Program of ChinaChina2014CB910203
National Science Foundation of ChinaChina31130065
National Science Foundation of ChinaChina91313301
National Institutes of Health/National Institute of Neurological Disorders and StrokeUnited StatesNS37200

Revision History  (Full details and data files)

  • Version 1.0: 2015-06-10
    Type: Initial release
  • Version 1.1: 2015-07-22
    Changes: Database references
  • Version 1.2: 2017-10-18
    Changes: Author supporting evidence, Derived calculations, Source and taxonomy