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Voltage-sensing domains: structural and functional diversity.

Martin C Heiss1, Bernhard E Flucher2,2

  • 1Department of Physiology and Medical Physics, Institute of Physiology, Medical University of Innsbruck, 6020, Innsbruck, Austria.

European Biophysics Journal : EBJ
|September 13, 2025
PubMed
Summary
This summary is machine-generated.

Voltage-sensing domains (VSDs) regulate ion channel function by sensing membrane potential. This review explores VSD structural diversity and its impact on ion channel gating properties.

Keywords:
Voltage-gated ion channelsVoltage-sensing domainscharge transfer centercounterchargesgating chargeshydrophobic constriction site

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Neuroscience

Background:

  • Voltage-sensing domains (VSDs) are critical components of voltage-gated ion channels.
  • VSDs translate changes in membrane potential into conformational changes that control ion flow.
  • The sliding helix model explains the basic mechanism of VSD function.

Purpose of the Study:

  • To review the structural and functional diversity of VSDs.
  • To discuss how variations in VSDs influence ion channel gating properties.
  • To highlight differences in gating charges, countercharges, and S4 helix movement.

Main Methods:

  • Literature review of VSD structure and function.
  • Analysis of diverse VSD gating mechanisms.
  • Comparative study of S4 helix movement and voltage dependence.

Main Results:

  • VSDs exhibit significant structural and functional diversity.
  • Variations exist in the number and nature of gating charges and countercharges.
  • The range, speed, and voltage dependence of S4 movement differ across VSDs.

Conclusions:

  • The distinct gating properties of ion channels are determined by VSD variations.
  • Understanding VSD diversity is key to comprehending ion channel function.
  • Further research into VSDs can reveal novel therapeutic targets.