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Functional dynamics and allosteric modulation of TRPA1.

Heidi Koldsø1, Morten Ø Jensen1, Vishwanath Jogini1

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Structure (London, England : 1993)
|September 20, 2023
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The TRPA1 channel

Keywords:
AITCTRP channelTRPA1allosteric modulationantagonistelectrophysiologyion channelpermeation

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Area of Science:

  • Molecular biology
  • Biophysics
  • Pharmacology

Background:

  • The Transient Receptor Potential Ankyrin 1 (TRPA1) channel is a key target for drug development.
  • Understanding TRPA1's dynamic gating mechanisms is crucial for structure-based drug design.

Purpose of the Study:

  • To investigate the functional dynamics of the TRPA1 channel using long-timescale molecular dynamics simulations.
  • To elucidate the allosteric gating mechanism of TRPA1 activation and inhibition.

Main Methods:

  • Long-timescale molecular dynamics simulations of TRPA1.
  • Allosteric activation by allyl isothiocyanate (AITC).
  • Experimental validation using site-directed mutagenesis.

Main Results:

  • Observed spontaneous transitions from closed to open TRPA1 conformations.
  • Proposed an allosteric gating mechanism involving the TRP-like domain and S5/S6 helices.
  • Identified A-967079 binding site between S5 and S6 helices, stabilizing a non-conducting state.

Conclusions:

  • TRPA1 gating involves allosteric communication between the TRP-like domain and the pore.
  • Mutations affecting the S4-S5 linker and S5/S6 helices impact channel activity.
  • A-967079 stabilizes a non-conducting state, consistent with the proposed gating mechanism.