3PUK

Re-refinement of the crystal structure of Munc18-3 and Syntaxin4 N-peptide complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.05 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.241 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Possible roles for Munc18-1 domain 3a and Syntaxin1 N-peptide and C-terminal anchor in SNARE complex formation

Hu, S.-H.Christie, M.P.Saez, N.J.Latham, C.F.Jarrott, R.Lua, L.H.L.Collins, B.M.Martin, J.L.

(2011) Proc Natl Acad Sci U S A 108: 1040-1045

  • DOI: https://doi.org/10.1073/pnas.0914906108
  • Primary Citation of Related Structures:  
    3PUJ, 3PUK

  • PubMed Abstract: 

    Munc18-1 and Syntaxin1 are essential proteins for SNARE-mediated neurotransmission. Munc18-1 participates in synaptic vesicle fusion via dual roles: as a docking/chaperone protein by binding closed Syntaxin1, and as a fusion protein that binds SNARE complexes in a Syntaxin1 N-peptide dependent manner. The two roles are associated with a closed-open Syntaxin1 conformational transition. Here, we show that Syntaxin N-peptide binding to Munc18-1 is not highly selective, suggesting that other parts of the SNARE complex are involved in binding to Munc18-1. We also find that Syntaxin1, with an N peptide and a physically anchored C terminus, binds to Munc18-1 and that this complex can participate in SNARE complex formation. We report a Munc18-1-N-peptide crystal structure that, together with other data, reveals how Munc18-1 might transit from a conformation that binds closed Syntaxin1 to one that may be compatible with binding open Syntaxin1 and SNARE complexes. Our results suggest the possibility that structural transitions occur in both Munc18-1 and Syntaxin1 during their binary interaction. We hypothesize that Munc18-1 domain 3a undergoes a conformational change that may allow coiled-coil interactions with SNARE complexes.


  • Organizational Affiliation

    Institute for Molecular Bioscience, Division of Chemistry and Structural Biology, The University of Queensland, Brisbane, Queensland 4072, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Syntaxin-binding protein 3
A, B
592Mus musculusMutation(s): 0 
Gene Names: Stxbp3Stxbp3aUnc18c
UniProt
Find proteins for Q60770 (Mus musculus)
Explore Q60770 
Go to UniProtKB:  Q60770
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ60770
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Syntaxin-4 N-terminal peptide
C, D
10Mus musculusMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P70452 (Mus musculus)
Explore P70452 
Go to UniProtKB:  P70452
IMPC:  MGI:893577
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP70452
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.05 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.241 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 170.4α = 90
b = 170.4β = 90
c = 170.4γ = 90
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
DENZOdata reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-02-12
    Changes: Database references
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Refinement description