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Updated: Jul 25, 2025

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TRPV4-Rho GTPase complex structures reveal mechanisms of gating and disease

Do Hoon Kwon1, Feng Zhang1, Brett A McCray2

  • 1Department of Biochemistry, Duke University School of Medicine, Durham, NC, 27710, USA.

Nature Communications
|June 23, 2023
PubMed

Insights

Structural insights reveal how RhoA regulates the TRPV4 ion channel. Disrupting this interaction causes neuromuscular disease, offering new therapeutic targets for TRPV4-related conditions.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biophysics

Background:

  • Crosstalk between ion channels and small GTPases is crucial for cellular homeostasis and disease.
  • Transient Receptor Potential Vanilloid 4 (TRPV4) is a calcium-permeable cation channel implicated in various conditions and hereditary neuromuscular diseases.
  • The structural basis of TRPV4 interactions with small GTPases, like RhoA, remains largely uncharacterized.

Purpose of the Study:

  • To elucidate the structural mechanisms underlying TRPV4 channel gating and its regulation by RhoA.
  • To investigate the role of the TRPV4-RhoA interface in channel activity and disease pathogenesis.
  • To provide structural insights for the development of TRPV4-targeted therapeutics.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) to determine the structures of human TRPV4 in complex with RhoA.
  • Analysis of TRPV4 structures in ligand-free, antagonist-bound closed, and agonist-bound open states.
  • Site-directed mutagenesis to probe the functional significance of the TRPV4-RhoA interface.

Main Results:

  • Cryo-EM structures reveal how RhoA interacts with TRPV4 across different functional states.
  • TRPV4 activation involves rigid-body rotation of its intracellular domain, which is modulated by RhoA binding.
  • Mutations at the TRPV4-RhoA interface are linked to disease and enhance TRPV4 channel activity, suggesting RhoA acts as a regulatory subunit.

Conclusions:

  • RhoA functions as an auxiliary subunit that regulates TRPV4 channel activity and calcium homeostasis.
  • Disruption of TRPV4-RhoA interactions contributes to TRPV4-related neuromuscular diseases.
  • Understanding these structural interactions is key for developing targeted therapies for TRPV4 channelopathies.

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