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Amphipathic molecules modulate PIEZO1 activity.

Charles D Cox1, Philip A Gottlieb2

  • 1The Victor Chang Cardiac Research Institute, Lowy Packer Building, Darlinghurst, NSW 2010, Australia.

Biochemical Society Transactions
|November 23, 2019
PubMed
Summary
This summary is machine-generated.

Amphipathic molecules significantly alter PIEZO1 channel function by modulating the lipid environment. These molecules influence PIEZO1 gating states and kinetics through interactions with the protein-lipid dome and footprint.

Keywords:
PIEZO channelsamphipathschannel domainsmechanotransduction

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Area of Science:

  • Biophysics
  • Cell Biology
  • Molecular Physiology

Background:

  • PIEZO proteins are large, mechanically-gated ion channels crucial for cellular mechanotransduction.
  • PIEZO1, a key member, forms a homotrimer assembling into a unique protein-lipid dome structure.
  • Channel gating is intrinsically linked to lipid bilayer tension and the associated protein-lipid interface (footprint).

Purpose of the Study:

  • To review the impact of amphipathic molecules on PIEZO1 channel function.
  • To elucidate how these molecules modulate the lipid bilayer and affect PIEZO1 gating kinetics.
  • To explore the relationship between lipid properties, PIEZO1 structure, and cellular mechanical response.

Main Methods:

  • Literature review of studies investigating PIEZO1 and amphipathic molecule interactions.
  • Analysis of Cryo-EM structural data for PIEZO1.
  • Examination of biophysical and cellular assays assessing channel function and lipid interactions.

Main Results:

  • Amphipathic molecules, including GsMTx4, saturated and polyunsaturated fatty acids, and cholesterol, profoundly affect PIEZO1 kinetics.
  • GsMTx4 inhibits the closed-to-open transition, while fatty acids alter gating by modifying lipid stiffness or disorder.
  • Cholesterol depletion disrupts PIEZO1-housing domains, altering channel kinetics and diffusion.

Conclusions:

  • Lipid properties and the PIEZO1 protein-lipid complex are critical determinants of channel function.
  • Amphipathic molecules serve as potent modulators of PIEZO1 activity by altering the biophysical characteristics of its membrane environment.
  • Understanding these lipido-molecular interactions is key to deciphering cellular mechanosensing mechanisms.