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Ion Channels

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...

Voltage-gated Ion Channels

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 Channels

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...

Current Density

Current Density

The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...

Non-gated Ion Channels

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 Channels

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: Jun 5, 2026

Identification of Specific Sensory Neuron Populations for Study of Expressed Ion Channels

Identification of Specific Sensory Neuron Populations for Study of Expressed Ion Channels

Published on: December 24, 2013

Charge density identification in ion channels.

G Wolansky¹, A Taflia

¹Department of Mathematics, Technion-Israel Institute of Technology, Technion City 32000, Israel.

The Journal of Chemical Physics

|December 29, 2010

Summary

This summary is machine-generated.

This study determines the permanent charge of biological ion channels using current-voltage data. We present improved methods for analyzing Poisson-Nernst-Planck models, enhancing accuracy and stability in charge density identification.

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Last Updated: Jun 5, 2026

Identification of Specific Sensory Neuron Populations for Study of Expressed Ion Channels

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Area of Science:

Biophysics
Computational Biology
Membrane Biophysics

Background:

Biological ion channels facilitate ion transport across cell membranes.
The permanent charge within ion channels significantly influences ion selectivity and current flow.
Accurate determination of this charge is crucial for understanding channel function.

Purpose of the Study:

To determine the permanent charge of ion channels from current-voltage (I-V) curves.
To address limitations in previous methods for fixed charge density identification.
To develop more stable and accurate algorithms for analyzing ion channel behavior.

Main Methods:

Modeling ion channel current using the Poisson-Nernst-Planck (PNP) equations.
Analyzing current-voltage (I-V) curves to extract channel properties.
Developing and applying novel, stable algorithms for fixed charge density identification.

Main Results:

The study proposes improved methods for identifying permanent charge in ion channels.
The suggested algorithms offer enhanced stability and accuracy compared to previous approaches.
The work refines the analysis of nonlinear PNP systems for biological channel modeling.

Conclusions:

Accurate determination of ion channel permanent charge is achievable through advanced computational methods.
The developed algorithms provide a more robust framework for studying ion channel electrophysiology.
This research contributes to a deeper understanding of ion transport mechanisms at the molecular level.