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Related Concept Videos

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...
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The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
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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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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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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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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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Updated: Sep 15, 2025

Recapitulation of an Ion Channel IV Curve Using Frequency Components
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Recapitulation of an Ion Channel IV Curve Using Frequency Components

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Molecular Basis of Sodium Channel Inactivation.

Francisco Bezanilla1, Yichen Liu1, Jason Galpin2

  • 1University of Chicago.

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|July 18, 2025
PubMed
Summary
This summary is machine-generated.

Voltage-gated sodium channels use fast inactivation to regulate electrical signals. A new "lock and key" model explains this ultra-fast pore-occlusion mechanism, replacing the old "ball and chain" theory.

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Related Experiment Videos

Last Updated: Sep 15, 2025

Recapitulation of an Ion Channel IV Curve Using Frequency Components
10:14

Recapitulation of an Ion Channel IV Curve Using Frequency Components

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Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes
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Mutagenesis and Functional Analysis of Ion Channels Heterologously Expressed in Mammalian Cells
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Mutagenesis and Functional Analysis of Ion Channels Heterologously Expressed in Mammalian Cells

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Area of Science:

  • Molecular biology
  • Neuroscience
  • Biophysics

Background:

  • Voltage-gated sodium channels are crucial for action potential initiation and electrical signaling.
  • Fast inactivation is a vital auto-inhibitory mechanism for sodium channel function.
  • The traditional "ball and chain" model no longer fully explains recent experimental findings.

Purpose of the Study:

  • To investigate the molecular mechanism of fast inactivation in voltage-gated sodium channels.
  • To capture the dynamic process of pore occlusion during inactivation.
  • To propose an updated theoretical framework for sodium channel fast inactivation.

Main Methods:

  • Utilized encoded fluorescence spectroscopy.
  • Employed high-resolution electrophysiology.
  • Analyzed voltage-sensor activation and pore occlusion dynamics.

Main Results:

  • Observed pore occlusion occurring in under 2 milliseconds.
  • Identified the domain IV voltage sensor's role in initiating linker movement.
  • Revealed repositioning of the IFM motif into a hydrophobic pocket, triggering pore blockage.
  • Characterized interactions between the IFM motif and S6 segments of DIV and DIII.

Conclusions:

  • Proposed a novel "lock and key" model for fast inactivation.
  • Demonstrated that S6 segment rotation precedes pore occlusion.
  • Provided a new molecular framework for understanding sodium channel auto-inhibition.