2WLL

POTASSIUM CHANNEL FROM BURKHOLDERIA PSEUDOMALLEI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.65 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history

Re-refinement Note

This entry reflects an alternative modeling of the original data in:1P7B


Literature

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

  • 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 ...

    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.


    Related Citations: 
    • 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

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
POTASSIUM CHANNEL A333Burkholderia pseudomalleiMutation(s): 0 
Gene Names: CHROMOSOME 1 KIRBAC1.1DF122_01560SAMEA1968934_03757
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
KirBac1.1 Inward-Rectifier Potassium channel (closed state)
Find proteins for P83698 (Burkholderia pseudomallei)
Explore P83698 
Go to UniProtKB:  P83698
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
POTASSIUM CHANNEL B333Burkholderia pseudomalleiMutation(s): 0 
Gene Names: CHROMOSOME 1 KIRBAC1.1DF122_01560SAMEA1968934_03757
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
KirBac1.1 Inward-Rectifier Potassium channel (closed state)
Find proteins for P83698 (Burkholderia pseudomallei)
Explore P83698 
Go to UniProtKB:  P83698
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.65 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.248 
  • 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
RAVEmodel building
SCALAdata scaling
SHELXSphasing
MLPHAREphasing
DMphasing
RAVEphasing
PHENIXrefinement

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: 2012-05-30
    Changes: Database references, Other, Refinement description
  • Version 1.2: 2013-01-30
    Changes: Data collection, Database references, Other, Version format compliance
  • Version 1.3: 2019-01-30
    Changes: Data collection, Experimental preparation
  • Version 1.4: 2019-02-06
    Changes: Data collection, Experimental preparation