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Related Concept Videos

Redox Reactions01:27

Redox Reactions

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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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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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Sulfur Assimilation01:20

Sulfur Assimilation

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Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Protein Modifications in the RER01:26

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Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
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Redox Equilibria: Overview01:23

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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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Live Imaging of the Mitochondrial Glutathione Redox State in Primary Neurons using a Ratiometric Indicator
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Glutaredoxin: Discovery, redox defense and much more.

Fernando T Ogata1, Vasco Branco2, Filipa F Vale3

  • 1Department of Biochemistry/Molecular Biology, CTCMol, Universidade Federal de São Paulo, Rua Mirassol, 207. 04044-010, São Paulo - SP, Brazil.

Redox Biology
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Summary

Glutaredoxin (Grx) proteins regulate cellular redox balance through glutathione conjugation and are vital in various physiological and pathological processes, including cancer and neurodegeneration.

Keywords:
DeglutathionylationGlutaredoxinGlutathionylationGrxs phylogeneticsIron homeostasisRedox regulation

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Biology

Background:

  • Glutaredoxin (Grx) is a protein family discovered in 1976, crucial for redox regulation.
  • The Grx system, involving glutathione, is essential for electron donation to Ribonucleotide Reductase.
  • Grx functions have expanded beyond redox to include iron-sulfur cluster formation.

Purpose of the Study:

  • To provide a comprehensive overview of Glutaredoxin (Grx) proteins.
  • To analyze the phylogenetic diversity of vertebrate Grxs.
  • To discuss Grx mechanisms, human isoforms, and their roles in health and disease.

Main Methods:

  • Phylogenetic analysis of vertebrate Glutaredoxin (Grx) proteins.
  • Review of biochemical mechanisms of Grx action, including glutathionylation and deglutathionylation.
  • Examination of human Grx isoforms and their physiological and pathological implications.

Main Results:

  • The Glutaredoxin (Grx) family has diverse isoforms across organisms with varied functions.
  • Grxs catalyze glutathione-dependent redox regulation and are involved in iron-sulfur cluster formation.
  • Grx functions are implicated in immune defense, neurodegeneration, and cancer.

Conclusions:

  • Glutaredoxin (Grx) proteins play critical roles in fundamental cellular processes.
  • Dysregulation of Grx activity is linked to significant human diseases.
  • Grx proteins represent potential therapeutic targets for various pathological conditions.