Experimental Data Snapshot

  • Resolution: 3.61 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.265 

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This is version 1.3 of the entry. See complete history


Domain Reorientation and Rotation of an Intracellular Assembly Regulate Conduction in Kir Potassium Channels.

Clarke, O.B.Caputo, A.T.Hill, A.P.Vandenberg, J.I.Smith, B.J.Gulbis, J.M.

(2010) Cell 141: 1018

  • DOI: https://doi.org/10.1016/j.cell.2010.05.003
  • Primary Citation of Related Structures:  
    2WLH, 2WLI, 2WLJ, 2WLK, 2WLL, 2WLM, 2WLN, 2WLO, 2X6A, 2X6B, 2X6C

  • PubMed Abstract: 

    Potassium channels embedded in cell membranes employ gates to regulate K+ current. While a specific constriction in the permeation pathway has historically been implicated in gating, recent reports suggest that the signature ion selectivity filter located in the outer membrane leaflet may be equally important. Inwardly rectifying K+ channels also control the directionality of flow, using intracellular polyamines to stem ion efflux by a valve-like action. This study presents crystallographic evidence of interdependent gates in the conduction pathway and reveals the mechanism of polyamine block. Reorientation of the intracellular domains, concomitant with activation, instigates polyamine release from intracellular binding sites to block the permeation pathway. Conformational adjustments of the slide helices, achieved by rotation of the cytoplasmic assembly relative to the pore, are directly correlated to the ion configuration in the selectivity filter. Ion redistribution occurs irrespective of the constriction, suggesting a more expansive role of the selectivity filter in gating than previously appreciated.

  • Organizational Affiliation

    The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3052, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
301Paramagnetospirillum magnetotacticumMutation(s): 0 
Membrane Entity: Yes 
Find proteins for D9N164 (Magnetospirillum magnetotacticum)
Explore D9N164 
Go to UniProtKB:  D9N164
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD9N164
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.61 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.265 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.261α = 90
b = 151.193β = 90
c = 294.757γ = 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: 2010-06-09
    Type: Initial release
  • Version 1.1: 2012-06-27
    Changes: Database references, Refinement description, Source and taxonomy, Version format compliance
  • Version 1.2: 2019-05-08
    Changes: Data collection, Experimental preparation, Other
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description