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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.

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...

Electrochemical Gradient and Channel Proteins: An Overview

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...

Gap Junctions

Gap Junctions

The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...

Gap Junctions

Gap Junctions

Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...

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Related Experiment Video

Updated: May 25, 2026

Proteomics to Identify Proteins Interacting with P2X2 Ligand-Gated Cation Channels

Proteomics to Identify Proteins Interacting with P2X2 Ligand-Gated Cation Channels

Published on: May 18, 2009

Pannexin 1 forms an anion-selective channel.

Weihong Ma¹, Vincent Compan, Wenxuan Zheng

¹Faculty of Life Sciences, The University of Manchester, Smith Building, Oxford Road, Manchester, UK.

Pflugers Archiv : European Journal of Physiology

|February 8, 2012

Summary

Pannexin 1 (Panx1) forms anion-selective channels in mammalian cells. These channels exhibit specific ion permeability, with a low single-channel conductance, impacting cellular function.

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Area of Science:

Cell biology
Ion channel physiology
Molecular biology

Background:

Pannexin 1 (Panx1) is a protein expressed in diverse mammalian tissues, including the brain and immune cells.
Understanding the precise function and properties of Panx1 channels is crucial for cellular communication and signaling.

Purpose of the Study:

To characterize the ion selectivity and conductance properties of Pannexin 1 (Panx1) channels expressed in mammalian cells.
To elucidate the functional role of Panx1 in cellular physiology.

Main Methods:

Expression of Panx1 in mammalian cells.
Electrophysiological recordings to measure ion channel activity and single-channel currents.
Determination of ion permeability using a rank order of anions.

Main Results:

Panx1 forms anion-selective channels in mammalian cells.
The rank order of anion permeability was determined as NO3(-) > I(-) > Br(-) > Cl(-) > F(-) >> aspartate ≈ glutamate ≈ gluconate.
Single-channel Panx1 currents exhibited a unitary conductance of approximately 68 pS, indicating a relatively low conductance channel.

Conclusions:

Pannexin 1 functions as a membrane-bound anion channel with distinct ion selectivity.
The low single-channel conductance of Panx1 suggests its role in specific cellular transport processes.
Further research into Panx1 channel activity can reveal its implications in various physiological and pathological conditions.