1KIL image
Deposition Date 2001-12-03
Release Date 2002-03-13
Last Version Date 2023-08-16
Entry Detail
PDB ID:
1KIL
Keywords:
MEMBRANE PROTEIN
Title:
Three-dimensional structure of the complexin/SNARE complex
Biological Source:
Source Organism:
Rattus norvegicus (Taxon ID: 10116)
Homo sapiens (Taxon ID: 9606)
Host Organism:
Escherichia coli BL21(DE3)
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.30 Å
R-Value Free:
0.30
R-Value Work:
0.24
Space Group:
P 21 21 21
1KIL validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Synaptobrevin SNARE motif
Gene (Uniprot):Vamp2
Chain IDs:A
Chain Length:66
Number of Molecules:1
Biological Source:Rattus norvegicus
UniProt ID:P63045 Pfam ID:PF00957
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Syntaxin SNARE motif short
Gene (Uniprot):Stx1a
Chain IDs:B
Chain Length:62
Number of Molecules:1
Biological Source:Rattus norvegicus
UniProt ID:P32851 Pfam ID:PF05739
Protein Blast
Polymer Type:polypeptide(L)
Molecule:SNAP-25 N-terminal SNARE motif
Gene (Uniprot):SNAP25
Mutations:W added at C-terminus
Chain IDs:C
Chain Length:74
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P60880
Protein Blast
Polymer Type:polypeptide(L)
Molecule:SNAP-25 C-terminal SNARE motif
Gene (Uniprot):SNAP25
Mutations:W added at C-terminus
Chain IDs:D
Chain Length:66
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P60880
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Complexin I SNARE-complex binding region
Gene (Uniprot):Cplx1
Chain IDs:E
Chain Length:49
Number of Molecules:1
Biological Source:Rattus norvegicus
UniProt ID:P63041 Pfam ID:PF05835
Ligand Molecules
MG
Primary Citation
Three-dimensional structure of the complexin/SNARE complex.
Neuron 33 397 409 (2002)
PMID: 11832227 DOI: 10.1016/S0896-6273(02)00583-4

Abstact

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.

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Primary Citation of related structures
1KIL