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Related Experiment Video

Updated: Jul 11, 2025

Purification and Reconstitution of TRPV1 for Spectroscopic Analysis
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How Much Does TRPV1 Deviate from An Ideal MWC-Type Protein.

Shisheng Li, Jie Zheng

    Biorxiv : the Preprint Server for Biology
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    PubMed
    Summary

    The Monod-Wyman-Changeux (MWC) model accurately predicts capsaicin receptor TRPV1 gating by vanilloids. A minor subunit position effect was observed, differing from hemoglobin allostery.

    Area of Science:

    • Biophysics
    • Molecular Biology
    • Structural Biology

    Background:

    • Ion channels function as allosteric proteins, linking environmental stimuli to pore opening.
    • The classic Monod-Wyman-Changeux (MWC) model is widely applied to ion channel gating, including hemoglobin allostery.
    • Understanding TRPV1 activation by vanilloids is crucial for pain modulation and sensory science.

    Approach:

    • Utilized a concatemeric design to stabilize TRPV1 in specific vanilloid-bound states (0-4 ligands).
    • Quantitatively assessed the accuracy of the MWC model in predicting TRPV1 gating behavior.
    • Investigated the energetic contribution of vanilloid binding to different subunit positions.

    Key Points:

    • The MWC model satisfactorily predicts the overall gating behavior of TRPV1.

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  • A subtle subunit position effect was detected, with kitty-corner subunit binding being more effective for channel opening.
  • This positional effect is quantitatively small (<10% of overall binding energy) and not predicted by the standard MWC model for hemoglobin.

    • Conclusions:

    • The MWC model provides a robust framework for understanding TRPV1 allosteric gating.
    • The observed subunit position effect highlights nuances in multi-subunit protein allostery beyond the classic MWC predictions.
    • Findings support the general applicability of evolutionary drives on allosteric proteins across multi-subunit systems.