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Related Concept Videos

Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical Gradient and Channel Proteins: An Overview

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 the...
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.

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Related Experiment Video

Updated: May 11, 2026

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes
10:19

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes

Published on: January 10, 2011

K(+) channels: function-structural overview.

Carlos González1, David Baez-Nieto, Ignacio Valencia

  • 1Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile.

Comprehensive Physiology
|June 1, 2013
PubMed
Summary
This summary is machine-generated.

Potassium channels (K+) are diverse and crucial for cellular functions like action potentials and hormone secretion. Understanding their structure-function relationships is key to deciphering their roles in various cell types.

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Recapitulation of an Ion Channel IV Curve Using Frequency Components
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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

Published on: October 1, 2010

Related Experiment Videos

Last Updated: May 11, 2026

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes
10:19

Patch Clamp and Perfusion Techniques for Studying Ion Channels Expressed in Xenopus oocytes

Published on: January 10, 2011

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

Recapitulation of an Ion Channel IV Curve Using Frequency Components

Published on: February 8, 2011

Mutagenesis and Functional Analysis of Ion Channels Heterologously Expressed in Mammalian Cells
15:28

Mutagenesis and Functional Analysis of Ion Channels Heterologously Expressed in Mammalian Cells

Published on: October 1, 2010

Area of Science:

  • Molecular Biology
  • Biophysics
  • Physiology

Background:

  • Potassium channels (K+) are vital for numerous physiological processes, including action potential dynamics, membrane potential control, and hormone secretion.
  • Their diverse functions are attributed to a large superfamily of K+ channels, with 70 genes encoding these proteins in mammals.

Purpose of the Study:

  • To provide an overview of the function, localization, and structure-function relationships of five major potassium channel subfamilies.
  • To explore the origins of the diversity within the potassium channel superfamily.

Main Methods:

  • Review of existing literature, including studies utilizing cloning, mutagenesis, and X-ray crystallography.
  • Analysis of conserved structural features, such as the pore region and ion-selectivity filter.

Main Results:

  • Potassium channels exhibit significant diversity, enabling their varied roles in different cell types.
  • Voltage-dependent K+ channels form tetrameric assemblies, sharing a conserved pore region, while two-pore K+ channels are dimers.

Conclusions:

  • The structural and functional diversity of potassium channels is essential for their widespread physiological importance.
  • Understanding the structure-function paradigm of K+ channels offers insights into cellular signaling and potential therapeutic targets.