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How much does TRPV1 deviate from an ideal MWC-type protein?

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  • 1Department of Physiology and Membrane Biology, University of California at Davis, School of Medicine, Davis, California.

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|April 7, 2024
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The Monod-Wyman-Changeux (MWC) model accurately predicts capsaicin receptor TRPV1 gating by vanilloids. A minor subunit position effect was observed, potentially due to membrane constraints, unlike in hemoglobin.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Structural Biology

Background:

  • Ion channels function as allosteric proteins, linking environmental stimuli to pore opening.
  • The Monod-Wyman-Changeux (MWC) model is a common framework for analyzing ion channel gating.
  • The capsaicin receptor TRPV1 is activated by vanilloids.

Purpose of the Study:

  • To assess the accuracy of the MWC model in predicting TRPV1 activation by vanilloids.
  • To investigate potential subunit position effects in TRPV1 gating.

Main Methods:

  • Utilized a concatemeric design to stabilize TRPV1 in specific vanilloid-bound states (0-4 ligands).
  • Quantitatively analyzed the gating behavior of TRPV1 under varying vanilloid binding conditions.

Main Results:

  • The MWC model satisfactorily predicts the overall gating behavior of TRPV1.
  • A small, detectable subunit position effect was observed: ligand binding to kitty-corner subunits was more effective than to neighboring subunits.
  • This effect, representing <10% of the ligand binding energy, may stem from membrane-induced subunit arrangement restrictions.

Conclusions:

  • The MWC model provides a robust framework for understanding TRPV1 gating.
  • A subtle subunit position effect exists in TRPV1, possibly influenced by the membrane environment.
  • This effect is likely absent in hemoglobin due to its different structural context.