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Related Concept Videos

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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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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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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DNA Distortion and Damage
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Redox Signaling through DNA.

Elizabeth O'Brien1, Rebekah M B Silva1, Jacqueline K Barton1

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena CA 91125.

Israel Journal of Chemistry
|January 17, 2017
PubMed
Summary
This summary is machine-generated.

Biological electron transfer is vital for cells. Research shows that DNA charge transport (DNA CT) mediated by [4Fe4S] clusters in metalloproteins enables long-range redox signaling, crucial for DNA repair processes.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Bioinorganic Chemistry

Background:

  • Biological electron transfer reactions involving metal cofactors are essential cellular processes.
  • Duplex DNA facilitates charge transport via its π-stacked nitrogenous bases.
  • [4Fe4S] clusters, redox-active cofactors, are increasingly found in DNA-processing enzymes.

Purpose of the Study:

  • To investigate the chemical properties of DNA charge transport (DNA CT).
  • To understand the biological implications of DNA CT.
  • To explore the role of DNA CT in redox signaling by metalloproteins.

Main Methods:

  • Examination of chemical characteristics of DNA CT.
  • Analysis of biological consequences of DNA CT.
  • Studying metalloproteins associated with DNA processing.

Main Results:

  • DNA CT is mediated by the π-stacked bases of duplex DNA.
  • [4Fe4S] clusters in DNA-binding enzymes utilize DNA CT for signaling.
  • DNA CT facilitates redox signaling over long molecular distances.

Conclusions:

  • DNA charge transport among metalloproteins is a potent mechanism for cellular redox signaling.
  • DNA CT may initiate lesion recognition by DNA repair proteins containing [4Fe4S] clusters.
  • This chemistry is powerful for long-range redox communication within the cell.