Crystal structure of an inward rectifier potassium channel

Experimental Data Snapshot

  • Resolution: 3.65 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.295 
  • R-Value Observed: 0.297 

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This is version 1.3 of the entry. See complete history

Re-refinement Note

A newer entry is available that reflects an alternative modeling of the original data: 2WLL


Crystal structure of the potassium channel KirBac1.1 in the closed state.

Kuo, A.Gulbis, J.M.Antcliff, J.F.Rahman, T.Lowe, E.D.Zimmer, J.Cuthbertson, J.Ashcroft, F.M.Ezaki, T.Doyle, D.A.

(2003) Science 300: 1922-1926

  • DOI: https://doi.org/10.1126/science.1085028
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The KirBac1.1 channel belongs to the inward-rectifier family of potassium channels. Here we report the structure of the entire prokaryotic Kir channel assembly, in the closed state, refined to a resolution of 3.65 angstroms. We identify the main activation gate and structural elements involved in gating. On the basis of structural evidence presented here, we suggest that gating involves coupling between the intracellular and membrane domains. This further suggests that initiation of gating by membrane or intracellular signals represents different entry points to a common mechanistic pathway.

  • Organizational Affiliation

    University of Oxford, Department of Biochemistry, Laboratory of Molecular Biophysics, South Parks Road, Oxford OX1 3QU, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
integral membrane channel and cytosolic domains
A, B
333Burkholderia pseudomalleiMutation(s): 0 
Gene Names: chromosome 1 kirbac1.1
Membrane Entity: Yes 
Find proteins for P83698 (Burkholderia pseudomallei)
Explore P83698 
Go to UniProtKB:  P83698
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP83698
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.65 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.295 
  • R-Value Observed: 0.297 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.84α = 90
b = 105.62β = 90
c = 258.63γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
DMmodel building
RAVEmodel building
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-06-17
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations