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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 Reactions01:27

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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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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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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: Overview01:21

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Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
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Redox Titration: Other Oxidizing and Reducing Agents01:26

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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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Resin-Assisted Capture Coupled with Isobaric Tandem Mass Tag Labeling for Multiplexed Quantification of Protein Thiol Oxidation
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Selenium and redox signaling.

Regina Brigelius-Flohé1, Leopold Flohé2

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Selenium is essential for selenoproteins involved in cellular redox balance and signaling. However, excessive intake of selenium compounds can be toxic, inducing cell death, highlighting the need for careful dosage.

Keywords:
CarcinogenesisEnergy metabolismHydroperoxide sensingInflammationProgrammed cell deathSelenoproteins

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Nutritional Science

Background:

  • Selenium is a crucial trace element, integral to selenoproteins, primarily oxidoreductases.
  • These selenoproteins, like glutathione peroxidases and thioredoxin reductases, play key roles in cellular signaling and protection against oxidative stress.
  • Both beneficial and toxic effects of selenium depend on dosage, with supra-nutritional levels leading to cell death.

Purpose of the Study:

  • To explore the dual role of selenium compounds in cellular signaling and toxicity.
  • To investigate the mechanisms by which selenium influences cell death pathways.
  • To understand the complexities of selenium's in vivo relevance in health optimization.

Main Methods:

  • Review of existing literature on selenium metabolism and selenoprotein function.
  • Analysis of studies investigating the effects of varying selenium dosages on cellular processes.
  • Examination of genetic and biochemical data on selenoprotein interactions with signaling pathways.

Main Results:

  • Selenium compounds are toxic at supra-nutritional doses, inducing cell death via reactive oxygen species.
  • At physiological levels, selenoproteins modulate signaling cascades, including inflammation and insulin pathways.
  • Selenoproteins also act as sensors for hydroperoxides, initiating signaling.
  • Challenges in delineating in vivo relevance due to variable biosynthesis, tissue-specific delivery, and incomplete functional characterization of selenoproteins.

Conclusions:

  • The precise in vivo relevance of selenoproteins in health signaling is complex and not fully understood.
  • Fragmentary knowledge on selenium's functions and toxicity precludes its uncritical use for health optimization.
  • Further research is needed to elucidate the intricate roles of selenium and its compounds in biological systems.