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 

wwPDB Validation   3D Report Full Report


This is version 1.2 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: 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 ...

    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
MoleculeChainsSequence LengthOrganismDetailsImage
Synaptobrevin SNARE motifA66Rattus norvegicusMutation(s): 0 
Gene Names: Synaptobrevin 2Vamp2Syb2
Find proteins for P63045 (Rattus norvegicus)
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Go to UniProtKB:  P63045
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Syntaxin SNARE motif shortB62Rattus norvegicusMutation(s): 0 
Gene Names: Syntaxin 1AStx1aSap
Find proteins for P32851 (Rattus norvegicus)
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Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
SNAP-25 N-terminal SNARE motifC74Homo sapiensMutation(s): 0 
Gene Names: SNAP-25SNAP25SNAP
Find proteins for P60880 (Homo sapiens)
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NIH Common Fund Data Resources
PHAROS:  P60880
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
SNAP-25 C-terminal SNARE motifD66Homo sapiensMutation(s): 0 
Gene Names: SNAP-25SNAP25SNAP
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PHAROS:  P60880
Protein Feature View
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Complexin I SNARE-complex binding regionE49Rattus norvegicusMutation(s): 0 
Gene Names: Complexin 1Cplx1
Find proteins for P63041 (Rattus norvegicus)
Explore P63041 
Go to UniProtKB:  P63041
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download Ideal Coordinates CCD File 
F [auth A], G [auth C]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
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