Pre-Fusion Solution NMR Structure of Neuronal SNARE Syntaxin 1A

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Prefusion structure of syntaxin-1A suggests pathway for folding into neuronal trans-SNARE complex fusion intermediate.

Liang, B.Kiessling, V.Tamm, L.K.

(2013) Proc Natl Acad Sci U S A 110: 19384-19389

  • DOI: https://doi.org/10.1073/pnas.1314699110
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The assembly of the three neuronal soluble N-ethylmaleimide-sensitive factor attachment protein (SNAP) receptor (SNARE) proteins synaptobrevin 2, syntaxin-1A, and SNAP-25 is the key step that leads to exocytotic fusion of synaptic vesicles. In the fully assembled SNARE complex, these three proteins form a coiled-coil four-helix bundle structure by interaction of their respective SNARE motifs. Although biochemical and mutational analyses strongly suggest that the heptad-repeat SNARE motifs zipper into the final structure, little is known about the prefusion state of individual membrane-bound SNAREs and how they change conformation from the unzippered prefusion to the zippered postfusion state in a membrane environment. We have solved the solution NMR structure of micelle-bound syntaxin-1A in its prefusion conformation. In addition to the transmembrane helix, the SNARE motif consists of two well-ordered, membrane-bound helices separated by the "0-layer" residue Gln226. This unexpected structural order of the N- and C-terminal halves of the uncomplexed SNARE motif suggests the formation of partially zippered SNARE complex intermediates, with the 0-layer serving as a proofreading site for correct SNARE assembly. Interferometric fluorescence measurements in lipid bilayers confirm that the open SNARE motif helices of syntaxin interact with lipid bilayers and that association with the other target-membrane SNARE SNAP-25 lifts the SNARE motif off the membrane as a critical prerequisite for SNARE complex assembly and membrane fusion.

  • Organizational Affiliation

    Center for Membrane Biology and Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22908.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Syntaxin-1A109Rattus norvegicusMutation(s): 0 
Gene Names: Stx1aSap
Membrane Entity: Yes 
Find proteins for P32851 (Rattus norvegicus)
Explore P32851 
Go to UniProtKB:  P32851
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP32851
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-11-20
    Type: Initial release
  • Version 1.1: 2013-11-27
    Changes: Database references
  • Version 1.2: 2013-12-11
    Changes: Database references
  • Version 1.3: 2024-05-01
    Changes: Data collection, Database references