1KIL

Three-dimensional structure of the complexin/SNARE complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 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


  • 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. Comple ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Synaptobrevin SNARE motif
A
66Rattus norvegicusMutation(s): 0 
Gene Names: Vamp2 (Syb2)
Find proteins for P63045 (Rattus norvegicus)
Go to UniProtKB:  P63045
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Syntaxin SNARE motif short
B
62Rattus norvegicusMutation(s): 0 
Gene Names: Stx1a (Sap)
Find proteins for P32851 (Rattus norvegicus)
Go to UniProtKB:  P32851
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
SNAP-25 N-terminal SNARE motif
C
74Homo sapiensMutation(s): 0 
Gene Names: SNAP25 (SNAP)
Find proteins for P60880 (Homo sapiens)
Go to Gene View: SNAP25
Go to UniProtKB:  P60880
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
SNAP-25 C-terminal SNARE motif
D
66Homo sapiensMutation(s): 0 
Gene Names: SNAP25 (SNAP)
Find proteins for P60880 (Homo sapiens)
Go to Gene View: SNAP25
Go to UniProtKB:  P60880
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Complexin I SNARE-complex binding region
E
49Rattus norvegicusMutation(s): 0 
Gene Names: Cplx1
Find proteins for P63041 (Rattus norvegicus)
Go to UniProtKB:  P63041
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, C
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 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 = 90.00
b = 60.425β = 90.00
c = 159.787γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
HKL-2000data collection
AMoREphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-03-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance