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Related Experiment Videos

The voltage sensor in voltage-dependent ion channels.

F Bezanilla1

  • 1Departments of Physiology and Anesthesiology, University of California at Los Angeles, School of Medicine, Los Angeles, California 90095, USA. fbezanil@ucla.edu

Physiological Reviews
|April 4, 2000
PubMed
Summary

Voltage sensors in ion channels detect membrane potential changes, controlling channel opening. This study reveals the energy coupling mechanism and structural basis of voltage-dependent gating, offering a physical model for channel operation.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Neuroscience

Background:

  • Voltage-gated ion channels (Na+, K+, Ca2+) regulate cellular excitability.
  • Their opening probability is modulated by membrane potential via voltage sensors.
  • Understanding the energy coupling and conformational changes is crucial for channel function.

Purpose of the Study:

  • To present the theoretical basis of energy coupling between electric fields and voltage sensors.
  • To interpret gating charge movement and gating currents in voltage-dependent channels.
  • To develop a physical model of voltage-dependent channel operation.

Main Methods:

  • Gating current analysis and noise analysis.
  • Mutagenesis experiments to locate voltage sensor residues.

Related Experiment Videos

  • Cysteine/histidine substitution and differential exposure analysis.
  • Site-directed fluorescence labeling.
  • Lanthanide-based resonance energy transfer (LRET).

    • Main Results:

    • Quantified gating charge movement and its relation to channel gating.
    • Identified key residues within the voltage sensor.
    • Detected conformational changes using fluorescence and LRET.
    • Established a correlation between local conformational changes and global channel gating.

    Conclusions:

    • A physical model for voltage-dependent channels is proposed.
    • Changes in membrane potential induce S4 segment rotation.
    • This rotation alters the accessibility of charged residues, controlling channel gating.