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Related Concept Videos

The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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.
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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...
Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

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...
Non-gated Ion Channels01:24

Non-gated Ion Channels

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.
Non-gated Ion Channels01:24

Non-gated Ion Channels

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.
Ion Channels01:19

Ion Channels

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 specific...

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

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Published on: February 8, 2011

On the selective ion binding hypothesis for potassium channels.

Ilsoo Kim1, Toby W Allen

  • 1Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, USA.

Proceedings of the National Academy of Sciences of the United States of America
|October 21, 2011
PubMed
Summary
This summary is machine-generated.

Potassium channels selectively filter potassium over sodium ions. This study reveals that ion preference is reduced when both ions occupy preferred sites, challenging traditional views on ion selectivity mechanisms.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Ion Channel Function

Background:

  • Potassium (K+) channel selectivity for K+ over sodium (Na+) ions is a long-standing question in physiology.
  • Current models propose conserved binding sites optimize K+ coordination, driving selectivity.

Purpose of the Study:

  • To investigate the thermodynamic and kinetic factors governing K+ and Na+ ion permeation through K+ channels.
  • To re-evaluate the role of ion binding sites in K+ channel selectivity.

Main Methods:

  • Utilized Bennett free energy perturbation calculations and umbrella sampling simulations.
  • Analyzed ion binding and movement within the KcsA channel selectivity filter.

Main Results:

  • Identified alternating ion binding sites within the KcsA channel filter, favoring K+ or Na+ individually.
  • Demonstrated reduced thermodynamic preference for K+ over Na+ when both ions occupy their preferred positions.
  • Explained experimental Ba2+ block data by showing Ba2+ exaggerates K+ over Na+ stability due to distinct binding sites.

Conclusions:

  • K+ channel selectivity is not solely determined by ion thermodynamics in crystallographic sites.
  • Kinetic barriers and multi-ion permeation mechanisms are crucial for understanding K+ channel selectivity.
  • Revises the prevailing understanding of ion selectivity in biological ion channels.