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Related Concept Videos

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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Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical Gradient and Channel Proteins: An Overview

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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:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell.  This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
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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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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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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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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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Related Experiment Video

Updated: Mar 8, 2026

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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Quantum Interference and Selectivity through Biological Ion Channels.

Vahid Salari1,2, Hamidreza Naeij3, Afshin Shafiee2,3

  • 1Department of Physics, Isfahan University of Technology, Isfahan 84156-83111, Iran.

Scientific Reports
|January 31, 2017
PubMed
Summary
This summary is machine-generated.

Quantum interference may explain ion channel selectivity, but environmental decoherence makes it unlikely. Further discussion explores possibilities for ion quantum effects in biological channels.

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Capturing the Interaction Kinetics of an Ion Channel Protein with Small Molecules by the Bio-layer Interferometry Assay
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Whole-cell Patch-clamp Recordings for Electrophysiological Determination of Ion Selectivity in Channelrhodopsins
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Area of Science:

  • Biophysics
  • Quantum Biology
  • Cell Physiology

Background:

  • The precise mechanism of ion channel selectivity remains a long-standing challenge in biological sciences.
  • Understanding ion transport is crucial for cellular function and various physiological processes.

Purpose of the Study:

  • To investigate the potential role of quantum interference in explaining ion channel selectivity.
  • To simulate ion behavior within cell membrane channels using principles from quantum physics.

Main Methods:

  • Modeled two adjacent ion channels on a cell membrane, analogous to the double-slit experiment.
  • Simulated the movement of ions through these channels to assess matter-wave interference possibilities.
  • Calculated decoherence timescales for ions within and outside the channels.

Main Results:

  • Calculated decoherence times for ions were short: approximately 100 picoseconds within channels and 17-53 picoseconds outside.
  • These short decoherence times suggest that quantum interference of ions is unlikely due to environmental decoherence.
  • Despite the findings, the study discusses factors that could potentially increase the likelihood of quantum interference.

Conclusions:

  • Quantum interference, while a proposed mechanism for ion channel selectivity, appears improbable due to rapid environmental decoherence.
  • The research highlights the need for further investigation into quantum phenomena in biological systems.
  • Future research should explore conditions that might mitigate decoherence and support ion quantum effects in ion channels.