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Non-gated Ion Channels01:24

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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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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 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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Voltage-gated Ion Channels01:26

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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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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Heterochannels Kv(1.1-1.2)2 and Their Interactions with Pore Blockers.

Anastasija V Efremenko1, Elena V Kryukova1, Oleg V Kazakov1

  • 1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia.

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|September 13, 2025
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Heterotetramerization of Kv1.1 and Kv1.2 channels creates functional diversity in the CNS. Ligand binding studies reveal specific affinities for the Kv(1.1-1.2)2 heterochannel, impacting channel function.

Keywords:
Kv1.1Kv1.2competitive bindingdissociation constantfluorescent microscopyheterochannelpatch clamppeptide blockervoltage-gated

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biophysics

Background:

  • Voltage-gated potassium channels, specifically Kv1.1 and Kv1.2 α-subunits, are crucial in the central nervous system (CNS).
  • Heterotetramerization of these subunits generates diverse functional channels, necessitating detailed characterization of their properties and ligand interactions.

Purpose of the Study:

  • To investigate the expression, electrophysiological, and ligand-binding properties of human Kv(1.1-1.2)2 heterochannels.
  • To determine the functional impact of heterochannel formation on channel activity and ligand affinity compared to homotetrameric channels.

Main Methods:

  • Expression of Kv(1.1-1.2)2 heterochannels using dimeric concatemers fused with fluorescent proteins in Neuro-2a cells.
  • Electrophysiological recordings to assess channel activation kinetics and voltage dependence.
  • Confocal microscopy and competitive binding assays to evaluate ligand-channel interactions and determine dissociation constants.

Main Results:

  • Kv(1.1-1.2)2 exhibits low-voltage activation, high activity, and fast, non-inactivating kinetics, with properties distinct from Kv1.2 homotetramers.
  • Hongotoxin 1 fused with GFP (HgTx-G) acts as a pore-blocking ligand with a dissociation constant of 100 pM.
  • Apparent dissociation constants for various peptides (Ce1, Ce4, hongotoxin 1, MeKTx11-1, agitoxin 2, charybdotoxin, scyllatoxin) binding to Kv(1.1-1.2)2 were determined, showing varied affinities.

Conclusions:

  • Kv(1.1-1.2)2 heterochannels may functionally compensate for Kv1.1 homotetrameric channel absence in the CNS.
  • Heterotetramerization significantly alters ligand binding affinities compared to homotetrameric Kv1.1 and Kv1.2 channels.
  • The study provides insights into the molecular basis of Kv channel diversity and regulation by ligands.