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Structure-based membrane dome mechanism for Piezo mechanosensitivity.

Yusong R Guo1, Roderick MacKinnon1

  • 1Laboratory of Molecular Neurobiology and Biophysics, Howard Hughes Medical Institute, The Rockefeller University, New York, United States.

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Summary

Researchers revealed the structure of the Piezo1 channel, a mechanosensitive ion channel. This discovery explains how Piezo1 senses mechanical forces to regulate cellular functions, offering insights into touch and balance.

Keywords:
Piezo channelbiophysicscryoEMmechanosensitivitymousestructural biology

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Area of Science:

  • Biophysics
  • Structural Biology
  • Cellular Physiology

Background:

  • Mechanosensitive ion channels are crucial for converting mechanical stimuli into cellular signals.
  • While MscL channels utilize pore-opening for gating, eukaryotic Piezo channels possess narrow pores, suggesting alternative gating mechanisms.
  • Understanding Piezo channel gating is vital for processes like touch sensation and cardiovascular regulation.

Purpose of the Study:

  • To determine the structural basis of mechanosensitive gating in eukaryotic Piezo channels.
  • To elucidate the mechanism by which Piezo1 channels respond to mechanical forces.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was employed to resolve the structure of mouse Piezo1.
  • High-resolution structural analysis at 3.7Å was performed on the closed conformation of the channel.

Main Results:

  • The cryo-EM structure revealed Piezo1 as a triskelion with arms composed of repeating 4-TM units surrounding a central pore.
  • The channel's unique structure induces local dome-like deformation in the cell membrane.
  • A hypothesis was proposed where changes in membrane deformation drive channel gating.

Conclusions:

  • The proposed mechanism suggests that membrane tension alters gating energetics proportionally to the change in projected dome area.
  • This model provides a quantitative explanation for the sensitive mechanical gating of narrow, cation-selective Piezo1 channels.
  • The findings offer significant insights into the molecular mechanisms of mechanotransduction in Piezo channels.