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Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
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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.
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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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Overview on Peroxiredoxin.

Sue Goo Rhee1

  • 1Yonsei Biomedical Research Institute, Yonsei University College of Medicine, Seoul 120-752, Korea.

Molecules and Cells
|February 3, 2016
PubMed
Summary
This summary is machine-generated.

Peroxiredoxins (Prxs) are essential enzymes that reduce harmful peroxides. This review summarizes current research on Prxs, detailing their catalytic cycle and diverse roles in cellular defense.

Keywords:
circadian rhythmhydrogen peroxideperoxiredoxinredox regulationthiol-specific peroxidasee

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Peroxiredoxins (Prxs) constitute a large, conserved family of enzymes.
  • They play a crucial role in reducing reactive oxygen species (ROS) within cells.
  • Prxs utilize a conserved cysteine residue (peroxidatic Cys, CP) for peroxide reduction.

Purpose of the Study:

  • To provide a comprehensive overview of current research on Peroxiredoxins (Prxs).
  • To elucidate the catalytic mechanism of Prxs, including peroxide oxidation and disulfide formation.
  • To connect findings from 10 related minireviews on Prx function and significance.

Main Methods:

  • Literature review and synthesis of existing studies on Peroxiredoxins.
  • Analysis of the biochemical mechanism involving cysteine residues (CP and CR).
  • Compilation and integration of findings from 10 specialized minireviews.

Main Results:

  • Detailed description of the Prx catalytic cycle: oxidation of CP-SH to CP-SOH.
  • Explanation of the reaction between CP-SOH and the resolving Cys (CR) to form a disulfide bond.
  • Highlighting the necessity of electron donors for disulfide reduction and enzyme regeneration.

Conclusions:

  • Peroxiredoxins are vital for cellular redox homeostasis and protection against oxidative damage.
  • Understanding the Prx catalytic cycle is key to comprehending their diverse biological functions.
  • This review consolidates current knowledge, paving the way for future research directions in the field.