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Related Concept Videos

The Resting Membrane Potential01:21

The Resting Membrane Potential

Overview
Resting Membrane Potential01:24

Resting Membrane Potential

The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
The Inside of a Neuron is More Negative
The membrane potential of a cell can be measured by inserting a microelectrode into a cell and comparing the charge to a reference electrode in the extracellular fluid. The...
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
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.
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...
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: Jul 4, 2026

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
10:08

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting

Published on: December 9, 2022

Tethering chemistry and K+ channels.

Trevor J Morin1, William R Kobertz1

  • 1Department of Biochemistry and Molecular Pharmacology, Programs in Neuroscience and Chemical Biology, University of Massachusetts Medical School, Worcester, Massachusetts 01605-2324.

The Journal of Biological Chemistry
|June 11, 2008
PubMed
Summary

Chemical tethering agents help researchers understand voltage-gated potassium (K+) channel movements. These tools probe K+ channel assembly, structure, function, and dynamics, bridging static structures with dynamic biological processes.

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Last Updated: Jul 4, 2026

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Voltage-gated potassium (K+) channels are crucial membrane proteins regulating cell excitability.
  • High-resolution crystal structures offer static views, but dynamic movements remain incompletely understood.
  • Understanding K+ channel dynamics is vital for cellular function and disease research.

Purpose of the Study:

  • To review the synthesis and application of chemical tethering agents for studying K+ channels.
  • To explore how these agents elucidate K+ channel assembly, structure, function, and dynamics.
  • To bridge the gap between static structural data and dynamic channel behavior.

Main Methods:

  • Utilizing chemical modifying reagents, including small molecule tethering agents.
  • Employing electrophysiological recordings to monitor channel activity.
  • Synthesizing and applying chemoselective electrophiles linked to ligands.

Main Results:

  • Chemical tethering agents provide detailed insights into K+ channel architecture and molecular motions.
  • These tools enable the manipulation of K+ channel complexes.
  • The study highlights the utility of tethering agents in resolving dynamic channel behavior.

Conclusions:

  • Chemical tethering agents are powerful tools for investigating voltage-gated K+ channel function.
  • They offer a means to connect static structural snapshots with dynamic molecular movements.
  • Further application of these agents will advance our understanding of ion channel biology.