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Updated: Aug 4, 2025

Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4
12:09

Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4

Published on: December 31, 2013

10.2K

Structural insights into TRPV4-Rho GTPase signaling complex function and disease

Do Hoon Kwon, Feng Zhang, Brett A McCray

    Biorxiv : the Preprint Server for Biology
    |March 30, 2023
    PubMed

    Insights

    Structural insights into TRPV4 channel interactions with RhoA reveal how their interplay regulates calcium homeostasis. Disruptions in this interaction are linked to neuromuscular diseases, guiding future therapeutic development.

    Area of Science:

    • Molecular biology
    • Structural biology
    • Biophysics

    Background:

    • Ion channel and small GTPase interactions are vital for cellular functions and disease.
    • TRPV4 (transient receptor potential vanilloid 4) is a calcium-permeable channel implicated in various conditions and hereditary neuromuscular diseases.
    • Understanding the structural basis of TRPV4's interaction with RhoA is crucial for deciphering its role in health and disease.

    Approach:

    • Utilized cryo-electron microscopy (cryo-EM) to determine high-resolution structures of human TRPV4.
    • Captured TRPV4 in complex with RhoA across apo, antagonist-bound closed, and agonist-bound open states.
    • Investigated the impact of mutations at the TRPV4-RhoA interface on channel activity.

    Key Points:

    • Cryo-EM structures reveal the mechanism of ligand-dependent TRPV4 gating and the role of RhoA in constraining channel movement.
    • The interaction interface between TRPV4 and RhoA is critical, with disease-associated mutations often found at this site.
    • Perturbing the TRPV4-RhoA interface increases TRPV4 channel activity, suggesting a link to disease pathogenesis.

    Conclusions:

    • The interaction strength between TRPV4 and RhoA modulates calcium homeostasis and actin remodeling.
    • Disruption of TRPV4-RhoA interactions contributes to TRPV4-related neuromuscular diseases.
    • These findings provide a structural foundation for developing targeted TRPV4 therapeutics.

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