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Updated: Sep 5, 2025

Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b
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Method for Identifying Small Molecule Inhibitors of the Protein-protein Interaction Between HCN1 and TRIP8b

Published on: November 11, 2016

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Regulation of HCN Channels by Protein Interactions

Colin H Peters1, Rohit K Singh1, John R Bankston1

  • 1Department of Physiology and Biophysics, University of Colorado Anschutz Medical Campus, Aurora, CO, United States.

Frontiers in Physiology
|July 7, 2022
PubMed

Insights

Hyperpolarization-activated, cyclic nucleotide-sensitive (HCN) channels regulate cell excitability. This review details protein partners like TRIP8b, filamin A, and IRAGs that modulate HCN channel function and expression.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Ion Channel Physiology

Background:

  • Hyperpolarization-activated, cyclic nucleotide-sensitive (HCN) channels are crucial for regulating subthreshold membrane potentials in excitable cells.
  • The four mammalian HCN channel isoforms (HCN1-HCN4) are involved in vital physiological processes, including cardiac pacemaking, sleep-wake cycles, memory, and sensory perception.

Purpose of the Study:

  • To review known protein interaction partners of HCN channels.
  • To elucidate the mechanisms by which these partners modulate HCN channel function and expression.
  • To identify knowledge gaps in the field of HCN channel regulation.

Main Methods:

  • Literature review of published studies on HCN channel interacting proteins.
  • Analysis of reported effects on HCN channel gating, expression, and cAMP sensitivity.
  • Synthesis of information on regulatory mechanisms.

Main Results:

  • TRIP8b is a well-characterized auxiliary subunit that regulates HCN channel expression and cAMP binding.
  • Other interacting proteins, including filamin A, Src tyrosine kinase, and MinK-related peptides, influence HCN channel gating and expression.
  • IRAG1 and LRMP (IRAG2) have been identified as specific regulators of the HCN4 isoform.

Conclusions:

  • HCN channel function is significantly shaped by interactions with various protein partners.
  • Understanding these interactions is key to comprehending HCN channel's physiological roles.
  • Further research is needed to fully characterize the mechanisms and physiological relevance of many HCN channel interacting proteins.

Keywords:
HCN channelsIRAGKCNETRIP8baccessory proteinsprotein subunits

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