2X6B

Potassium Channel from Magnetospirillum Magnetotacticum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.237 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


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:  
    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 ...

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ATP-SENSITIVE INWARD RECTIFIER POTASSIUM CHANNEL 10A301Magnetospirillum magnetotacticumMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for D9N164 (Magnetospirillum magnetotacticum)
Explore D9N164 
Go to UniProtKB:  D9N164
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD9N164
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PC
Query on PC

Download Ideal Coordinates CCD File 
E [auth A]PHOSPHOCHOLINE
C5 H15 N O4 P
YHHSONZFOIEMCP-UHFFFAOYSA-O
 Ligand Interaction
BA
Query on BA

Download Ideal Coordinates CCD File 
B [auth A]BARIUM ION
Ba
XDFCIPNJCBUZJN-UHFFFAOYSA-N
 Ligand Interaction
K
Query on K

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
F [auth A]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.237 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.798α = 90
b = 104.798β = 90
c = 88.417γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-06-23
    Type: Initial release
  • Version 1.1: 2012-06-27
    Changes: Database references, Non-polymer description, Refinement description, Structure summary, Version format compliance