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Related Concept Videos

Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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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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Potentiometry: Membrane Electrodes01:15

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Ion Channels01:19

Ion Channels

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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.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
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Patch Clamp01:18

Patch Clamp

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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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Ligand-gated Ion Channels01:19

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Related Experiment Video

Updated: Apr 8, 2026

A Micro-agar Salt Bridge Electrode for Analyzing the Proton Turnover Rate of Recombinant Membrane Proteins
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Metal bridges to probe membrane ion channel structure and function.

Paul Linsdell

    Biomolecular Concepts
    |June 24, 2015
    PubMed
    Summary

    Investigating ion channel dynamics using cysteine reactivity reveals conformational changes. Metal bridges formed by cysteine side-chains provide insights into ion channel gating and structure.

    Area of Science:

    • Biochemistry
    • Structural Biology
    • Molecular Biophysics

    Background:

    • Ion channels are crucial membrane proteins controlling ion transport via conformational changes.
    • Understanding the dynamic molecular mechanisms of ion channel gating remains challenging with current structural techniques.

    Purpose of the Study:

    • To review functional approaches for studying ion channel dynamic structures.
    • To highlight the utility of cysteine reactivity, particularly metal bridges, in probing conformational rearrangements.

    Main Methods:

    • Utilizing cysteine side-chain reactivity to assess protein accessibility and proximity.
    • Employing metal bridges (e.g., Cd2+, Zn2+) to cross-link cysteine residues and map 3D conformational changes.
    • Analyzing intra-molecular metal bridges to identify specific conformational rearrangements in ion channels.

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    Single-Molecule Imaging of Lateral Mobility and Ion Channel Activity in Lipid Bilayers using Total Internal Reflection Fluorescence TIRF Microscopy
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    Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
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    A Micro-agar Salt Bridge Electrode for Analyzing the Proton Turnover Rate of Recombinant Membrane Proteins
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    Single-Molecule Imaging of Lateral Mobility and Ion Channel Activity in Lipid Bilayers using Total Internal Reflection Fluorescence TIRF Microscopy
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    Single-Molecule Imaging of Lateral Mobility and Ion Channel Activity in Lipid Bilayers using Total Internal Reflection Fluorescence TIRF Microscopy

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    Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
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    Main Results:

    • Cysteine accessibility studies define movements within the ion channel permeation pathway.
    • Intra-molecular metal bridges reveal three-dimensional proximity changes during channel gating.
    • Factors influencing metal bridge affinity and conformational sensitivity are discussed.

    Conclusions:

    • Cysteine-based functional methods, especially metal bridging, are powerful tools for elucidating ion channel dynamic structures.
    • These techniques provide detailed insights into the conformational basis of ion channel function and regulation.
    • Further studies can leverage these methods to explore diverse ion channel types and their gating mechanisms.