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Mechanism of C-type inactivation in the hERG potassium channel

Jing Li1, Rong Shen2, Bharat Reddy2

  • 1Department of BioMolecular Sciences, Division of Medicinal Chemistry, School of Pharmacy, University of Mississippi, University, MS 38677, USA.

Science Advances
|January 30, 2021
PubMed

Insights

The voltage-activated potassium channel hERG

Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Biophysics

Background:

  • The hERG potassium channel is crucial for cardiac repolarization.
  • Dysfunction of hERG channels, due to drug interactions or mutations, can cause cardiac pathologies.
  • Understanding hERG channel inactivation mechanisms is vital for human health.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying C-type inactivation in the hERG channel.
  • To investigate the structural and functional effects of disease-associated mutations on hERG inactivation.
  • To identify key molecular determinants of hERG C-type inactivation.

Main Methods:

  • Long-timescale molecular dynamics simulations.
  • Free energy landscape calculations.
  • Electrophysiological experiments.

Main Results:

  • C-type inactivation in hERG is linked to a constricted conformation of the selectivity filter.
  • F627 side-chain rotation and the Y616-N629 hydrogen bond are identified as critical for inactivation.
  • hERG inactivation is modulated by the intracellular gate's opening via filter-gate allosteric coupling.

Conclusions:

  • The study reveals key molecular players in hERG C-type inactivation.
  • Findings provide insights into disease mechanisms related to hERG channel dysfunction.
  • The results advance the understanding of allosteric regulation in potassium channels.

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