1KIL

Three-dimensional structure of the complexin/SNARE complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.245 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Three-dimensional structure of the complexin/SNARE complex.

Chen, X.Tomchick, D.R.Kovrigin, E.Arac, D.Machius, M.Sudhof, T.C.Rizo, J.

(2002) Neuron 33: 397-409

  • DOI: https://doi.org/10.1016/s0896-6273(02)00583-4
  • Primary Citation of Related Structures:  
    1KIL

  • PubMed Abstract: 

    During neurotransmitter release, the neuronal SNARE proteins synaptobrevin/VAMP, syntaxin, and SNAP-25 form a four-helix bundle, the SNARE complex, that pulls the synaptic vesicle and plasma membranes together possibly causing membrane fusion. Complexin binds tightly to the SNARE complex and is essential for efficient Ca(2+)-evoked neurotransmitter release. A combined X-ray and TROSY-based NMR study now reveals the atomic structure of the complexin/SNARE complex. Complexin binds in an antiparallel alpha-helical conformation to the groove between the synaptobrevin and syntaxin helices. This interaction stabilizes the interface between these two helices, which bears the repulsive forces between the apposed membranes. These results suggest that complexin stabilizes the fully assembled SNARE complex as a key step that enables the exquisitely high speed of Ca(2+)-evoked neurotransmitter release.


  • Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Synaptobrevin SNARE motif66Rattus norvegicusMutation(s): 0 
Gene Names: Synaptobrevin 2
Membrane Entity: Yes 
UniProt
Find proteins for P63045 (Rattus norvegicus)
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Go to UniProtKB:  P63045
Entity Groups  
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UniProt GroupP63045
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Syntaxin SNARE motif short62Rattus norvegicusMutation(s): 0 
Gene Names: Syntaxin 1A
Membrane Entity: Yes 
UniProt
Find proteins for P32851 (Rattus norvegicus)
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Go to UniProtKB:  P32851
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UniProt GroupP32851
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
SNAP-25 N-terminal SNARE motif74Homo sapiensMutation(s): 0 
Gene Names: SNAP-25
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P60880 (Homo sapiens)
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Go to UniProtKB:  P60880
PHAROS:  P60880
GTEx:  ENSG00000132639 
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UniProt GroupP60880
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
SNAP-25 C-terminal SNARE motif66Homo sapiensMutation(s): 0 
Gene Names: SNAP-25
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P60880 (Homo sapiens)
Explore P60880 
Go to UniProtKB:  P60880
PHAROS:  P60880
GTEx:  ENSG00000132639 
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UniProt GroupP60880
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  • Reference Sequence
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Complexin I SNARE-complex binding region49Rattus norvegicusMutation(s): 0 
Gene Names: Complexin 1
UniProt
Find proteins for P63041 (Rattus norvegicus)
Explore P63041 
Go to UniProtKB:  P63041
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UniProt GroupP63041
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.245 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.489α = 90
b = 60.425β = 90
c = 159.787γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
AMoREphasing
CNSrefinement
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description