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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
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Related Experiment Video

Updated: Nov 24, 2025

Single-Molecule Imaging of Lateral Mobility and Ion Channel Activity in Lipid Bilayers using Total Internal Reflection Fluorescence TIRF Microscopy
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Lipid-protein forces predict conformational changes in a mechanosensitive channel.

Csaba Daday1, Bert L de Groot2

  • 1Department of Theoretical and Computational Biophysics, Computational Biomolecular Dynamics Group, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.

European Biophysics Journal : EBJ
|December 23, 2020
PubMed
Summary

Membrane tension shifts TREK-2 potassium channels to a higher conductance state. Changes in protein-lipid interactions predict this conformational shift, revealing key residues involved in mechanosensation.

Keywords:
Conformational changeForce distribution analysisFunctional mode analysisIon channelMembrane tension

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Pharmacology

Background:

  • The TREK-2 potassium channel, a K2P family member, is crucial for physiological functions and a potential drug target.
  • Membrane tension is known to influence TREK-2 channel conformation, favoring an "up" state with higher conductance.
  • The precise molecular mechanism by which membrane tension affects TREK-2 conformation remains unclear.

Purpose of the Study:

  • To elucidate the mechanism by which membrane tension modulates TREK-2 potassium channel conformation.
  • To identify the specific protein-lipid interactions that underlie TREK-2 mechanosensitivity.
  • To pinpoint key amino acid residues involved in the conformational response to membrane tension.

Main Methods:

  • Computational modeling and simulations to analyze protein-lipid interactions.
  • Analysis of conformational changes in the TREK-2 channel.
  • Identification of critical residues mediating the interaction between the channel and the lipid bilayer.

Main Results:

  • Changes in protein-lipid interaction patterns accurately predict the conformational shift of TREK-2 channels in response to membrane tension.
  • Specific patterns of interaction between TREK-2 and surrounding lipids are identified as drivers of the conformational change.
  • Several key amino acid residues within the TREK-2 channel are implicated in mediating these tension-sensitive interactions.

Conclusions:

  • Protein-lipid interactions are sufficient to explain the conformational changes in TREK-2 channels induced by membrane tension.
  • Understanding these interactions provides novel insights into the molecular basis of mechanosensation in ion channels.
  • The identified residues represent potential targets for therapeutic modulation of TREK-2 channel activity.