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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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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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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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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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Ladder Diagrams: Redox Equilibria01:30

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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1
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Redox-Sensing Iron-Sulfur Cluster Regulators.

Jason C Crack1, Nick E Le Brun1

  • 1Centre for Molecular and Structural Biochemistry, School of Chemistry, University of East Anglia , Norwich Research Park, Norwich, United Kingdom .

Antioxidants & Redox Signaling
|October 3, 2017
PubMed
Summary
This summary is machine-generated.

Iron-sulfur cluster proteins regulate gene expression by sensing environmental changes. Recent advances in structural and mechanistic studies of key regulators like FNR and NsrR are improving our understanding of these vital cellular processes.

Keywords:
DNA regulatorO2iron–sulfurnitric oxideredox stress

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Iron-sulfur (Fe-S) clusters are crucial components of proteins involved in diverse cellular functions, including gene regulation.
  • Fe-S clusters act as sensory modules, detecting environmental stimuli through their reactivity with small molecules.
  • This sensing mechanism triggers conformational changes that modulate DNA binding, leading to cellular adaptation.

Purpose of the Study:

  • To review recent structural and mechanistic advances in understanding iron-sulfur cluster regulators.
  • To focus on oxygen (O2) and nitric oxide (NO) sensors such as FNR and NsrR, and WhiB-like proteins in Actinobacteria.
  • To highlight the challenges and future directions in characterizing these complex regulatory systems.

Main Methods:

  • Structural characterization using high-resolution techniques.
  • Mechanistic studies to understand signal transduction pathways.
  • Investigation of protein-environment interactions controlling cluster sensitivity.

Main Results:

  • Significant progress in characterizing the structure and mechanism of Fe-S cluster regulators.
  • Detailed insights into the function of O2/NO sensors FNR and NsrR.
  • Emerging understanding of how local environments influence Fe-S cluster reactivity.

Conclusions:

  • Recent advances provide a foundation for understanding how Fe-S cluster proteins transduce environmental signals to regulate gene expression.
  • Challenges remain in obtaining high-resolution structural data and characterizing unstable intermediates.
  • Novel approaches are needed to fully elucidate the mechanisms of these important regulators.