3SWH

Munc13-1, MUN domain, C-terminal module


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.247 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The Crystal Structure of a Munc13 C-terminal Module Exhibits a Remarkable Similarity to Vesicle Tethering Factors.

Li, W.Ma, C.Guan, R.Xu, Y.Tomchick, D.R.Rizo, J.

(2011) Structure 19: 1443-1455

  • DOI: 10.1016/j.str.2011.07.012
  • Primary Citation of Related Structures:  
    3SWH

  • PubMed Abstract: 
  • Unc13/Munc13s play a crucial function in neurotransmitter release through their MUN domain, which mediates the transition from the Syntaxin-1/Munc18-1 complex to the SNARE complex. The MUN domain was suggested to be related to tethering factors, but no MUN-domain structure is available to experimentally validate this notion and address key unresolved questions about the interactions and minimal structural unit required for Unc13/Munc13 function ...

    Unc13/Munc13s play a crucial function in neurotransmitter release through their MUN domain, which mediates the transition from the Syntaxin-1/Munc18-1 complex to the SNARE complex. The MUN domain was suggested to be related to tethering factors, but no MUN-domain structure is available to experimentally validate this notion and address key unresolved questions about the interactions and minimal structural unit required for Unc13/Munc13 function. Here we identify an autonomously folded module within the MUN domain (MUN-CD) and show that its crystal structure is remarkably similar to several tethering factors. We also show that the activity in promoting the Syntaxin-1/Munc18-1 to SNARE complex transition is strongly impaired in MUN-CD. These results show that MUN domains and tethering factors indeed belong to the same family and may have a common role in membrane trafficking. We propose a model whereby the MUN-CD module is central for Munc13 function but full activity requires adjacent sequences.


    Related Citations: 
    • Munc13 mediates the transition from the closed syntaxin-Munc18 complex to the SNARE complex.
      Ma, C., Li, W., Xu, Y., Rizo, J.
      (2011) Nat Struct Mol Biol 18: 542

    Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center, 6000 Harry Hines Boulevard, Dallas, TX 75390, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protein unc-13 homolog AA, B341Rattus norvegicusMutation(s): 0 
Gene Names: Unc13aUnc13h1
Membrane Entity: Yes 
UniProt
Find proteins for Q62768 (Rattus norvegicus)
Explore Q62768 
Go to UniProtKB:  Q62768
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ62768
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.247 
  • Space Group: P 42
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 160.791α = 90
b = 160.791β = 90
c = 42.239γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-3000data collection
SHELXSphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-11-02
    Type: Initial release
  • Version 1.1: 2017-07-26
    Changes: Source and taxonomy
  • Version 1.2: 2017-11-08
    Changes: Refinement description