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Related Concept Videos

Ion Channels01:19

Ion Channels

68.0K
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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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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Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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Non-gated Ion Channels01:24

Non-gated Ion Channels

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Non-gated Ion Channels01:24

Non-gated Ion Channels

7.3K
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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Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

11.2K
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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Controllable Ion Channel Expression through Inducible Transient Transfection
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Controllable Ion Channel Expression through Inducible Transient Transfection

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Modeling ion channels: past, present, and future.

Daniel Sigg1

  • 1dPET, Spokane, WA 99223 dansigg@gmail.com.

The Journal of General Physiology
|June 18, 2014
PubMed
Summary
This summary is machine-generated.

This review explores modeling ion channel gating mechanisms using kinetic theory, molecular dynamics, and statistical thermodynamics. Understanding these models is crucial for cell signaling and homeostasis research.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Computational Biology

Background:

  • Ion channels are crucial membrane proteins regulating cell signaling and homeostasis.
  • Gating mechanisms are studied via electrophysiology, environmental, chemical, and mutational perturbations.
  • Sophisticated experimental techniques necessitate advanced phenomenological models of ion channel gating.

Purpose of the Study:

  • To review key areas contributing to the understanding of ion channel gating.
  • To highlight the evolution of modeling techniques for ion channel gating.
  • To present a generalized approach applicable to various ion channels and macromolecules.

Main Methods:

  • Review of traditional Eyring kinetic theory.
  • Analysis of molecular dynamics simulations.
  • Application of statistical thermodynamics principles.

Main Results:

  • Integration of diverse theoretical frameworks for modeling ion channel gating.
  • Demonstration of the applicability of these methods beyond voltage-dependent channels.
  • Foundation for developing realistic and mechanistically accurate gating models.

Conclusions:

  • Phenomenological models are essential for interpreting complex ion channel gating data.
  • The discussed modeling approaches offer a generalized framework for studying macromolecular function.
  • Further development in modeling will enhance our understanding of ion channel function in health and disease.