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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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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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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 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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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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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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How to flip the (redox) switch.

George Georgiou1

  • 1Department of Chemical Engineering, Institute for Cell and Molecular Biology, University of Texas, Austin, TX 78712, USA. georgiou@che.utexas.edu

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|December 5, 2002
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Summary
This summary is machine-generated.

Redox-sensitive transcription factors, like OxyR and Yap1, are activated by protein thiol modifications. New research reveals distinct pathways for how different agents trigger transcription via redox stress.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Redox-sensitive transcription factors regulate gene expression in response to oxidative stress.
  • Key examples include OxyR in E. coli and Yap1 in S. cerevisiae.
  • Activation involves post-translational modification of reactive protein thiols, leading to conformational changes.

Purpose of the Study:

  • To explore the distinct pathways through which various agents mediate redox stress.
  • To understand how these agents activate transcription via specific mechanisms.
  • To provide new insights into the regulation of redox-sensitive transcription factors.

Main Methods:

  • Analysis of post-translational modifications of protein thiols.
  • Investigating conformational changes in transcription factors.
  • Studying the effects of different redox-stress-inducing agents.
  • Elucidating specific signaling pathways involved in transcription activation.

Main Results:

  • Demonstrated that different agents induce redox stress through unique pathways.
  • Identified specific mechanisms of transcription factor activation.
  • Highlighted the role of post-translational thiol modifications in this process.
  • Provided novel insights into cellular redox regulation.

Conclusions:

  • Redox-sensitive transcription factors are activated via distinct pathways depending on the stress agent.
  • Post-translational modification of protein thiols is a critical regulatory step.
  • Understanding these specific pathways is crucial for comprehending cellular responses to oxidative stress.