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Updated: Jul 3, 2025

Whole-cell Patch-clamp Recordings for Electrophysiological Determination of Ion Selectivity in Channelrhodopsins
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Whole-cell Patch-clamp Recordings for Electrophysiological Determination of Ion Selectivity in Channelrhodopsins

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Potassium-selective channelrhodopsins.

Elena G Govorunova1, Oleg A Sineshchekov1, John L Spudich1

  • 1Center for Membrane Biology, Department of Biochemistry and Molecular Biology, University of Texas Health Science Center at Houston, McGovern Medical School, Houston, TX 77030, USA.

Biophysics and Physicobiology
|February 16, 2024
PubMed
Summary
This summary is machine-generated.

Kalium channelrhodopsins (KCRs) offer novel optogenetic control by selectively conducting potassium ions. These unique channels, distinct from traditional K+ channels, enable optical inhibition of neuronal and cardiomyocyte activity.

Keywords:
ion channelsion selectivityoptogeneticsphotocurrent

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Area of Science:

  • Optogenetics
  • Channelrhodopsins
  • Ion Channels

Background:

  • Channelrhodopsins are vital optogenetic tools for controlling excitable cells.
  • Existing channelrhodopsins include proton, non-selective cation, or anion channels.
  • Therapeutic potential demonstrated by vision restoration in a human patient.

Purpose of the Study:

  • To review recent advances in kalium channelrhodopsin (KCR) research.
  • To highlight the unique K+ selectivity mechanism of KCRs.
  • To suggest future research directions for KCRs.

Main Methods:

  • Discovery of KCRs with high K+ selectivity.
  • Mutant analysis to identify key selectivity residues.
  • High-resolution structural determination of KCRs.
  • Expression of KCRs in mouse neurons and human cardiomyocytes.

Main Results:

  • KCRs exhibit over 10-fold higher selectivity for K+ over Na+.
  • KCRs utilize a unique protomer-intrinsic selectivity mechanism, lacking canonical filters.
  • Key residues at the conduction pathway ends determine K+ selectivity.
  • KCR expression successfully inhibited electrical activity in neurons and cardiomyocytes.

Conclusions:

  • KCRs represent a novel class of optogenetic tools with unique K+ selectivity.
  • Their distinct mechanism offers new possibilities for precise cellular control.
  • KCRs hold promise for future therapeutic applications in optogenetics.