1JQ1

POTASSIUM CHANNEL (KCSA) OPEN GATE MODEL


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the KcsA channel intracellular gate in the open state.

Liu, Y.S.Sompornpisut, P.Perozo, E.

(2001) Nat.Struct.Mol.Biol. 8: 883-887

  • DOI: 10.1038/nsb1001-883
  • Primary Citation of Related Structures:  1JQ2

  • PubMed Abstract: 
  • Ion channels catalyze the selective transfer of ions across the membrane in response to a variety of stimuli. These channels gate by controlling the access of ions to a centrally located water-filled pore. The crystal structure of the Streptomyces li ...

    Ion channels catalyze the selective transfer of ions across the membrane in response to a variety of stimuli. These channels gate by controlling the access of ions to a centrally located water-filled pore. The crystal structure of the Streptomyces lividans potassium channel (KcsA) has allowed a molecular exploration of this mechanism. Electron paramagnetic resonance (EPR) studies have uncovered significant conformational changes at the intracellular end of the second transmembrane helix (TM2) upon gating. We have used site-directed spin labeling (SDSL) and EPR spectroscopy in an attempt to quantify the structural rearrangements of the KcsA TM2 bundle underlying the transition from the closed to the open state. Under conditions favoring the closed and open conformations, 10 intersubunit distances were obtained across TM2 segments from tandem dimer constructs. Analysis of these data points to a mechanism in which each TM2 helix tilts away from the permeation pathway, towards the membrane plane, and rotates about its helical axis, supporting a scissoring-type motion with a pivot point near residues 107-108. These movements are accompanied by a large increase in the diameter of the vestibule below the central water-filled cavity.


    Related Citations: 
    • Calculation of Rigid Body Conformational Changes Using Restraint-Driven Cartesian Transformations
      Sompornpisut, P.,Liu, Y.-S.,Perozo, E.
      () TO BE PUBLISHED --: --
    • The Structure of the Potassium Channel: Molecular Basis of K+ Conduction and Selectivity
      Doyle, D.A.,Morais Cabral, J.,Pfuetzner, R.A.,Kuo, A.,Gulbis, J.M.,Cohen, S.L.,Chait, B.T.,Mackinnon, R.
      (1998) Science 280: 69
    • Structural Rearrangements Underlying K+-Channel Activation Gating
      Perozo, E.,Cortes, D.M.,Cuello, L.G.
      (1999) Science 285: 73


    Organizational Affiliation

    Department of Molecular Physiology and Biological Physics, Center for Structural Biology, University of Virginia Health Sciences Center, Charlottesville, Virginia 22906-0011, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
VOLTAGE-GATED POTASSIUM CHANNEL
A, B, C, D
34Streptomyces lividansGene Names: kcsA (skc1)
Find proteins for P0A334 (Streptomyces lividans)
Go to UniProtKB:  P0A334
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-10-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance