2WLO

POTASSIUM CHANNEL FROM MAGNETOSPIRILLUM MAGNETOTACTICUM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.036 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.245 

wwPDB Validation 3D Report Full Report


This is version 1.2 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

  • Primary Citation of Related Structures:  

  • 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 lo ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
POTASSIUM CHANNEL
A, B
301Magnetospirillum magnetotacticumMutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
KirBac3.1 Inward-Rectifier Potassium channel (semi-latched)
Find proteins for D9N164 (Magnetospirillum magnetotacticum)
Go to UniProtKB:  D9N164
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.036 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.245 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 105.860α = 90.00
b = 115.360β = 90.00
c = 289.110γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-06-23
    Type: Initial release
  • Version 1.1: 2012-06-06
    Type: Database references, Refinement description, Version format compliance
  • Version 1.2: 2013-04-17
    Type: Source and taxonomy