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Lipid regulation of hERG1 channel function.

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  • 1Centre for Molecular Simulation and Department of Biological Sciences, 507 Campus Drive, University of Calgary, Calgary, AB, Canada.

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Lipid molecules like ceramide can block potassium (K+) currents by binding to the hERG1 channel. This binding alters channel gating, offering new insights into electrical signaling regulation.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Cardiology

Background:

  • Lipid regulation is crucial for ion channel function and electrical signaling.
  • Understanding how specific lipids affect ion channel gating is essential for cell physiology.

Purpose of the Study:

  • To investigate the mechanistic effects of lipophilic molecules, specifically a ceramide-sphingolipid probe, on the gating kinetics and potassium (K+) currents of the hERG1 channel.
  • To elucidate the binding sites and allosteric modulation mechanisms of ceramide on hERG1.

Main Methods:

  • Utilized microsecond-long molecular dynamics (MD) simulations.
  • Performed experimental mutagenesis and electrophysiology.
  • Combined simulation and experimental data for comprehensive analysis.

Main Results:

  • The sphingolipid probe induced a left shift in activation voltage and faster deactivation rates.
  • Ceramide binding was identified at the interface of the pore and voltage-sensing domains in a unique channel crevice.
  • Observed current blockade comparable to traditional hERG1 blockers.

Conclusions:

  • Ceramide allosterically modulates hERG1 channel activity through a conformational selection mechanism.
  • The findings provide mechanistic insights into lipid regulation of ion channel function.
  • This study highlights a novel interaction site for lipophilic modulation in mammalian channels.