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Mechanically-gated Ion Channels01:12

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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 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.
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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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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.
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An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
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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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Multiple Conductance States in Artificial Unimolecular Channels.

Jia-Fen Lin1, Xu-Dong Wang1, Yu-Fei Ao1,2

  • 1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 3, 2025
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Summary

Researchers developed a novel artificial ion channel capable of observing and modulating subconductance states. This breakthrough in supramolecular chemistry provides new insights into ion channel function and design.

Keywords:
anion–π interactionsartificial single‐molecule channelmolecular funneloxacalix[2]arene[2]triazinesubconductance state

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Area of Science:

  • Supramolecular Chemistry
  • Biophysical Chemistry
  • Materials Science

Background:

  • The patch-clamp technique has identified subconductance states in natural ion channels, crucial for understanding their function.
  • The precise structural underpinnings of these subconductance states remain largely unknown.
  • Replicating subconductance behavior in artificial ion channels is a significant challenge.

Purpose of the Study:

  • To present a conceptual design for artificial ion channels capable of observing and modulating subconductance states.
  • To establish a simplified molecular model for investigating ion channel structure-function relationships.
  • To experimentally validate the concept using a specific macrocyclic framework.

Main Methods:

  • Design of a conformationally self-tuning macrocyclic skeleton.
  • Synthesis and characterization of oxacalix[2]arene[2]triazine-based molecular funnels.
  • Utilizing artificial ion channels to study subconductance phenomena.

Main Results:

  • Demonstrated the successful creation of artificial channels exhibiting tunable subconductance states.
  • Validated the concept of a self-tuning macrocyclic skeleton for controlling ion flow.
  • Provided experimental evidence for the feasibility of observing and modulating subconductance in synthetic systems.

Conclusions:

  • The developed macrocyclic framework offers a promising platform for studying ion channel gating mechanisms.
  • This work advances the design principles for artificial ion channels with controllable conductances.
  • The findings pave the way for new tools in biophysical research and molecular device development.