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Related Experiment Videos

Structural changes during ion channel gating.

Declan A Doyle1

  • 1Structural Genomics Consortium, University of Oxford, Botnar research Centre, Oxford OX3 7LD, UK. declan.doyle@sgr.ox.ac.uk

Trends in Neurosciences
|May 29, 2004
PubMed
Summary
This summary is machine-generated.

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Ion channels open when transmembrane helices move, displacing a hydrophobic gate. This rapid movement at subunit interfaces facilitates ion flow across cell membranes.

Area of Science:

  • Biophysics
  • Structural Biology
  • Molecular Biology

Background:

  • Ion channels are crucial membrane proteins regulating ion transport.
  • Their function relies on conformational changes between closed and open states.
  • The ion conduction pathway is typically located at the interface between protein subunits.

Purpose of the Study:

  • To investigate the structural mechanisms underlying ion channel gating.
  • To compare gating motions in mechanosensitive, ligand-gated, and potassium-selective channels.
  • To understand how these movements facilitate ion conduction.

Main Methods:

  • Analysis of recently determined structures of three distinct ion channels.
  • Comparison of transmembrane helix movements during gating.

Related Experiment Videos

  • Identification of gating mechanisms (tilting, rotation, bending) and gate displacement.

    • Main Results:

    • Mechanosensitive, ligand-gated, and K(+) selective channels move transmembrane helices away from the ion pathway upon opening.
    • A hydrophobic gate is displaced, allowing ion movement.
    • Three distinct rigid-body motions (tilting, rotation, bending) are employed by different channels.
    • Gating motions are rapid, suggesting efficient ion transport.

    Conclusions:

    • Transmembrane helix displacement is a common mechanism for ion channel gating.
    • Rapid, large-scale movements facilitate rapid ion flux.
    • The formation of conduction pathways at subunit interfaces is linked to these gating mechanisms.