1L4A

X-RAY STRUCTURE OF THE NEURONAL COMPLEXIN/SNARE COMPLEX FROM THE SQUID LOLIGO PEALEI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.344 
  • R-Value Work: 0.297 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

X-ray structure of a neuronal complexin-SNARE complex from squid.

Bracher, A.Kadlec, J.Betz, H.Weissenhorn, W.

(2002) J.Biol.Chem. 277: 26517-26523

  • DOI: 10.1074/jbc.M203460200

  • PubMed Abstract: 
  • Nerve terminals release neurotransmitters from vesicles into the synaptic cleft upon transient increases in intracellular Ca(2+). This exocytotic process requires the formation of trans SNARE complexes and is regulated by accessory proteins including ...

    Nerve terminals release neurotransmitters from vesicles into the synaptic cleft upon transient increases in intracellular Ca(2+). This exocytotic process requires the formation of trans SNARE complexes and is regulated by accessory proteins including the complexins. Here we report the crystal structure of a squid core complexin-SNARE complex at 2.95-A resolution. A helical segment of complexin binds in anti-parallel fashion to the four-helix bundle of the core SNARE complex and interacts at its C terminus with syntaxin and synaptobrevin around the ionic zero layer of the SNARE complex. We propose that this structure is part of a multiprotein fusion machinery that regulates vesicle fusion at a late pre-fusion stage. Accordingly, Ca(2+) may initiate membrane fusion by acting directly or indirectly on complexin, thus allowing the conformational transitions of the trans SNARE complex that are thought to drive membrane fusion.


    Organizational Affiliation

    European Molecular Biology Laboratory, 6 rue Jules Horowitz, 38042 Grenoble, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SYNAPTOBREVIN
A
80Doryteuthis pealeiiN/A
Find proteins for P47194 (Doryteuthis pealeii)
Go to UniProtKB:  P47194
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
S-SYNTAXIN
B
88Doryteuthis pealeiiN/A
Find proteins for O46345 (Doryteuthis pealeii)
Go to UniProtKB:  O46345
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
S-SNAP25 fusion protein
C
83Doryteuthis pealeiiN/A
Find proteins for Q8T3S4 (Doryteuthis pealeii)
Go to UniProtKB:  Q8T3S4
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
S-SNAP25 fusion protein
D
87Doryteuthis pealeiiN/A
Find proteins for Q8T3S4 (Doryteuthis pealeii)
Go to UniProtKB:  Q8T3S4
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
SYNAPHIN A
E
79Doryteuthis pealeiiGene Names: cpx
Find proteins for Q95PA1 (Doryteuthis pealeii)
Go to UniProtKB:  Q95PA1
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.344 
  • R-Value Work: 0.297 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 26.072α = 90.00
b = 75.430β = 90.00
c = 243.109γ = 90.00
Software Package:
Software NamePurpose
BEASTmodel building
BEASTphasing
CNSrefinement
MOSFLMdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-07-31
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance