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Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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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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Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
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Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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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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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
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Related Experiment Video

Updated: Jun 30, 2025

Multifunctional, Micropipette-based Method for Incorporation And Stimulation of Bacterial Mechanosensitive Ion Channels in Droplet Interface Bilayers
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Mechanosensitive channel MscL gating transitions coupling with constriction point shift.

Mingfeng Zhang1,2,3, Siyang Tang3, Xiaomin Wang1

  • 1Department of Cell Biology, College of Medicine, Jiaxing University, Jiaxing, China.

Protein Science : a Publication of the Protein Society
|March 19, 2024
PubMed
Summary
This summary is machine-generated.

Mechanosensitive channel of large conductance (MscL) protects bacteria from osmotic stress. New research reveals how MscL gating transitions, involving constriction shifts, enable initial ion flow under membrane tension.

Keywords:
MscLconstriction pointgating poregating substategating transitionsmechanosensitive channelprotien-lipid interaction

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Cell Biology

Background:

  • Mechanosensitive channel of large conductance (MscL) is crucial for bacterial survival during hypoosmotic stress.
  • MscL functions as a cellular emergency release valve, protecting against osmotic shock.
  • Understanding MscL gating mechanisms is key to deciphering mechanotransduction.

Purpose of the Study:

  • To investigate the detailed gating process of the MscL channel.
  • To identify specific residues and interactions involved in MscL pore opening.
  • To elucidate the transitions between closed and open states of MscL.

Main Methods:

  • In vivo bacterial viability assays.
  • Single-channel patch-clamp electrophysiology.
  • Cysteine cross-linking and tryptophan fluorescence quenching.

Main Results:

  • MscL mutants revealed shifts in the constriction point towards the cytoplasmic side during gating (G26 -> G22 -> L19).
  • These shifts indicate a coupling between closed-expanded transitions and pore opening for ion permeation.
  • Hydrophobic and lipid interactions at specific 'hot spots' regulate these gating transitions.

Conclusions:

  • The study provides high-resolution insights into MscL gating transitions from closed to open substates.
  • Demonstrates that MscL gating involves coordinated movement of the constriction region in response to membrane tension.
  • Highlights the role of lipid-protein interactions in modulating MscL channel function.