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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

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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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Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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Radical Autoxidation01:20

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Reducing systems protecting the bacterial cell envelope from oxidative damage.

Isabelle S Arts1, Alexandra Gennaris1, Jean-François Collet1

  • 1WELBIO, Avenue Hippocrate 75, 1200 Brussels, Belgium; de Duve Institute, Université catholique de Louvain (UCL), Avenue Hippocrate 75, 1200 Brussels, Belgium; Brussels Center for Redox Biology, Avenue Hippocrate 75, 1200 Brussels, Belgium.

FEBS Letters
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Summary

Bacteria use reducing pathways to protect their cell envelopes from oxidative stress. These mechanisms repair damaged proteins, crucial for survival against host-generated reactive oxygen species (ROS).

Keywords:
DsbDDsbGMethionine sulfoxidePeriplasmPilBSulfenic acid

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Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • Reactive oxygen species (ROS) cause cellular damage, including to DNA, lipids, and proteins.
  • Sulfur-containing amino acids (cysteine, methionine) in proteins are highly susceptible to ROS-induced oxidation.
  • The bacterial cell envelope is the primary defense barrier and is directly exposed to host-generated ROS.

Purpose of the Study:

  • To review recent findings on reducing pathways that protect the bacterial cell envelope from oxidative damage.
  • To highlight mechanisms for repairing oxidized cysteine and methionine residues in envelope proteins.
  • To identify key unanswered questions in the field of bacterial oxidative stress defense.

Main Methods:

  • Literature review of recent scientific findings.
  • Focus on biochemical pathways involved in oxidative damage repair.
  • Analysis of mechanisms protecting bacterial cell envelopes.

Main Results:

  • Identification of several reducing pathways that protect the bacterial cell envelope.
  • Detailed examination of repair mechanisms for oxidized cysteine and methionine residues.
  • Understanding the critical role of these pathways in bacterial survival.

Conclusions:

  • Reducing pathways are essential for bacterial cell envelope integrity under oxidative stress.
  • Repair of oxidized proteins is crucial for survival against host-derived ROS.
  • Further research is needed to fully elucidate these defense mechanisms and their targets.