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Related Concept Videos

Redox Reactions01:27

Redox Reactions

1.4K
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
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Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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Related Experiment Video

Updated: Apr 4, 2026

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry
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Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry

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The redox switch that regulates molecular chaperones.

Myra E Conway, Christopher Lee

    Biomolecular Concepts
    |September 10, 2015
    PubMed
    Summary

    Redox regulation modifies cysteine residues in proteins like peroxiredoxin and protein disulphide isomerase, enabling dual antioxidant and chaperone functions. This thiol-disulphide exchange is crucial for cellular health and disease.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cellular Redox Biology

    Background:

    • Reactive cysteine residues are critical in cellular redox signaling.
    • Oxidation of cysteine can lead to reversible (disulfide bonds) or irreversible (sulfonic acid) states.
    • Cellular antioxidant systems, such as thioredoxin and glutaredoxin, protect against excessive cysteine oxidation.

    Purpose of the Study:

    • To review how thiol-disulphide exchange regulates peroxiredoxin (Prx) and protein disulphide isomerase (PDI) functions.
    • To explore the dual antioxidant and chaperone activities of Prx and PDI.
    • To introduce branched-chain aminotransferase as a novel redox-regulated protein with chaperone-like mechanisms.

    Main Methods:

    • Literature review focusing on redox regulation of protein structure and function.

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    Combining Non-reducing SDS-PAGE Analysis and Chemical Crosslinking to Detect Multimeric Complexes Stabilized by Disulfide Linkages in Mammalian Cells in Culture
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  • Analysis of thiol-disulphide exchange mechanisms in Prx and PDI.
  • Comparative mechanistic analysis including branched-chain aminotransferase.

    • Main Results:

    • Prx and PDI exhibit redox-dependent structural rearrangements, switching between antioxidant and molecular chaperone roles.
    • Oxidation of Prx to cysteine sulfinic acid triggers aggregation and a chaperone function under stress.
    • PDI's redox-active sites undergo oxidation, exposing hydrophobic regions for polypeptide folding.

    Conclusions:

    • Redox-induced switches in Prx and PDI are vital for adapting protein structure and function.
    • These redox-regulated chaperones play significant roles in maintaining protein homeostasis.
    • Dysregulation of these redox mechanisms is implicated in neurodegenerative diseases like Alzheimer's and Parkinson's.