2ZW3

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • 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


Literature

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: 10.1038/nature07869
  • Primary Citation of Related Structures:  
    2ZW3

  • 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 G ...

    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.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Gap junction beta-2 proteinABCDEF226Homo sapiensMutation(s): 0 
Gene Names: GJB2
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Gap Junctions and Related Channels
Protein: 
Connexin 26 (Cx26; GJB2) gap junction
Find proteins for P29033 (Homo sapiens)
Explore P29033 
Go to UniProtKB:  P29033
NIH Common Fund Data Resources
PHAROS  P29033
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
SHARPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

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