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Balancing Redox Equations02:58

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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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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 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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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Updated: Feb 6, 2026

Profiling Thiol Redox Proteome Using Isotope Tagging Mass Spectrometry
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Small Molecules Govern Thiol Redox Switches.

Johannes Knuesting1, Renate Scheibe1

  • 1Department of Plant Physiology, Faculty of Biology and Chemistry, Osnabrück University, Barbarastr. 11, 49076 Osnabrück, Germany.

Trends in Plant Science
|August 29, 2018
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Summary

Chloroplast enzymes use reversible redox modifications, controlled by small molecules, to regulate metabolic pathways during photosynthesis. This thiol switch mechanism integrates redox state and metabolism for environmental adaptation.

Keywords:
Redoxcysteine modificationsmetabolic fluxesphotosynthesisregulationthiol switches

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Area of Science:

  • Biochemistry
  • Plant Physiology
  • Molecular Biology

Background:

  • Oxygenic photosynthesis evolved enzyme regulation via reversible redox-modifications.
  • Chloroplasts utilize these on-off switches to segregate metabolic pathways and prevent futile cycles.
  • Redox interconversions finely tune enzyme activation states during illumination.

Purpose of the Study:

  • To investigate the role of small molecules in modulating redox-regulated enzymes in chloroplasts.
  • To elucidate the mechanism by which small molecules govern thiol switches.
  • To explore the integration of redox state and metabolism for environmental response.

Main Methods:

  • Analysis of enzyme kinetics.
  • Spectroscopic methods to study redox states.
  • Metabolite binding assays.

Main Results:

  • Small molecules noncovalently bind to chloroplast enzymes, influencing their reduction and oxidation rates.
  • This binding modulates the activity of thiol switches.
  • The regulatory principle demonstrates integration of redox state and metabolism.

Conclusions:

  • Chloroplast enzymes exemplify a regulatory principle where small molecules control thiol switches.
  • This mechanism allows for appropriate responses to environmental challenges by integrating redox state and metabolism.
  • The principle is applicable to reactive thiols in redox signaling, oxidative stress, and disease across organisms.