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Related Concept Videos

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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Ion Channels01:19

Ion Channels

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several types of...
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Non-gated Ion Channels01:24

Non-gated Ion Channels

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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
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Ligand-gated Ion Channels01:19

Ligand-gated Ion Channels

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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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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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Multifunctional, Micropipette-based Method for Incorporation And Stimulation of Bacterial Mechanosensitive Ion Channels in Droplet Interface Bilayers
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Mechano-Sensitive Synthetic Ion Channels.

Takahiro Muraoka1,2, Kaori Umetsu3, Kazuhito V Tabata4

  • 1School of Life Science and Technology, Tokyo Institute of Technology , 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.

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Researchers developed synthetic molecules that mimic cell membrane proteins sensing mechanical stress. These tension-responsive amphiphiles show potential for creating novel mechano-sensitive molecular devices.

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Area of Science:

  • Biomaterials Science
  • Molecular Engineering
  • Supramolecular Chemistry

Background:

  • Mechanical stress is a key stimulus for biological systems, primarily sensed by membrane proteins.
  • Synthetic molecules rarely exhibit sensitivity to mechanical forces, limiting the development of mechano-responsive devices.
  • Mechano-sensitive ion channels in cell membranes provide a biological blueprint for force detection.

Purpose of the Study:

  • To design and synthesize novel tension-responsive transmembrane amphiphiles.
  • To investigate the mechanical response and ion transport capabilities of these synthetic molecules.
  • To compare the operating forces of synthetic systems with natural mechano-sensitive proteins.

Main Methods:

  • Development of single- and three-transmembrane amphiphiles.
  • Incorporation of amphiphiles into lipid membranes.
  • Spectroscopic analysis to assess molecular stacking and response to tension.
  • Ion transport assays under varying mechanical tension conditions.

Main Results:

  • Single-transmembrane amphiphiles showed tension-dependent weakening and strengthening of molecular stacking, triggering ion transport under expanding tension.
  • Three-transmembrane amphiphiles formed unimolecular channels for ion transport even without tension, with activity decreasing under expanding tension.
  • The operating forces of these synthetic systems were found to be comparable to those of natural mechano-sensitive proteins.

Conclusions:

  • Synthetic transmembrane amphiphiles can be engineered to respond to mechanical stress.
  • Different molecular architectures (single- vs. three-transmembrane) exhibit distinct tension-response mechanisms and ion transport behaviors.
  • This research paves the way for the development of new synthetic mechano-sensitive molecular devices.