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Related Concept Videos

Non-gated Ion Channels01:24

Non-gated Ion Channels

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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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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Patch Clamp01:18

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Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
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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.
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Related Experiment Video

Updated: Aug 9, 2025

Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond
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2D-dwell-time analysis with simulations of ion-channel gating using high-performance computing.

Efthymios Oikonomou1, Thomas Gruber2, Achanta Ravi Chandra1

  • 1Institut für Physiologie und Pathophysiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.

Biophysical Journal
|February 23, 2023
PubMed
Summary

We developed a new method using message-passing interface (MPI) and high-performance computing (HPC) to analyze single-channel ion-channel recordings. This approach overcomes limitations in analyzing noisy data and estimating complex protein conformational changes.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Ion Channel Research

Background:

  • Single-channel patch-clamp recordings offer real-time insights into protein complex dynamics and conformational changes.
  • Hidden Markov models (HMMs) are commonly used to interpret ion-channel gating data, but face challenges with noise and limited bandwidth.
  • Two-dimensional (2D)-dwell-time histograms provide a robust method for analyzing noisy ion-channel data and inferring model topology.

Purpose of the Study:

  • To overcome the limitations of time-consuming and unreliable fitting processes in 2D-dwell-time histogram analysis.
  • To enable the full potential of 2D-dwell-time analysis for ion-channel research, especially with noisy and fast gating events.
  • To develop an automated method for determining current levels in conducting states despite low-pass filtering effects.

Main Methods:

  • Implementation of a message-passing interface (MPI) for massive parallel computing on high-performance computing (HPC) clusters.
  • Generation of simulation ensembles to derive reliable, ranked solutions for HMM fitting.
  • Integration of 2D-dwell-time histogram fitting with current amplitude distribution analysis.

Main Results:

  • Massively parallel computing enabled ensemble solutions, significantly improving the analysis of noisy ion-channel data.
  • The method successfully addressed challenges posed by fast gating events beyond filter frequencies and improved Markov model topology estimation.
  • Automatic determination of current levels in conducting states was achieved by combining 2D-fit objective functions with current amplitude deviation.

Conclusions:

  • The developed MPI-based HPC approach unlocks the full potential of 2D-dwell-time analysis for ion-channel research.
  • This method enhances the ability to study protein conformational changes from noisy single-channel recordings with minimal experimentalist input.
  • The findings pave the way for more accurate and efficient analysis of complex ion-channel kinetics and gating mechanisms.