Structure of the connexin-26 gap junction channel at 3.5 angstrom resolution

Experimental Data Snapshot

  • Resolution: 3.50 Å
  • R-Value Free: 0.351 
  • R-Value Work: 0.337 
  • R-Value Observed: 0.338 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


Structure of the connexin 26 gap junction channel at 3.5 A resolution

Maeda, S.Nakagawa, S.Suga, M.Yamashita, E.Oshima, A.Fujiyoshi, Y.Tsukihara, T.

(2009) Nature 458: 597-602

  • DOI: https://doi.org/10.1038/nature07869
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Gap junctions consist of arrays of intercellular channels between adjacent cells that permit the exchange of ions and small molecules. Here we report the crystal structure of the gap junction channel formed by human connexin 26 (Cx26, also known as GJB2) at 3.5 A resolution, and discuss structural determinants of solute transport through the channel. The density map showed the two membrane-spanning hemichannels and the arrangement of the four transmembrane helices of the six protomers forming each hemichannel. The hemichannels feature a positively charged cytoplasmic entrance, a funnel, a negatively charged transmembrane pathway, and an extracellular cavity. The pore is narrowed at the funnel, which is formed by the six amino-terminal helices lining the wall of the channel, which thus determines the molecular size restriction at the channel entrance. The structure of the Cx26 gap junction channel also has implications for the gating of the channel by the transjunctional voltage.

  • Organizational Affiliation

    Institute for Protein Research, Osaka University, OLABB, 6-2-3, Furuedai, Suita, Osaka 565-0874, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Gap junction beta-2 protein
A, B, C, D, E
A, B, C, D, E, F
226Homo sapiensMutation(s): 0 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P29033 (Homo sapiens)
Explore P29033 
Go to UniProtKB:  P29033
GTEx:  ENSG00000165474 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29033
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.50 Å
  • R-Value Free: 0.351 
  • R-Value Work: 0.337 
  • R-Value Observed: 0.338 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 167.617α = 90
b = 111.245β = 114.04
c = 155.387γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-04-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance