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Redox Reactions

Redox Reactions

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...

Redox Reactions

Redox Reactions

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...

Redox Equilibria: Overview

Redox Equilibria: Overview

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...

Balancing Redox Equations

Balancing Redox Equations

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...

Ladder Diagrams: Redox Equilibria

Ladder Diagrams: Redox Equilibria

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.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...

Redox Titration: Overview

Redox Titration: Overview

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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Related Experiment Video

Updated: Jul 1, 2026

EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1

EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1

Published on: November 26, 2014

RegB/RegA, a global redox-responding two-component system.

Jiang Wu¹, Carl E Bauer

¹Department of Biology, Indiana University, Myers Hall, 915 E. Third St., Bloomington, IN 47405-7170, USA.

Advances in Experimental Medicine and Biology

|September 17, 2008

Summary

This summary is machine-generated.

The RegB-RegA system in bacteria controls energy processes like photosynthesis and respiration. It senses redox signals via ubiquinone, regulating gene transcription for diverse metabolic functions.

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Last Updated: Jul 1, 2026

EPR Monitored Redox Titration of the Cofactors of Saccharomyces cerevisiae Nar1

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Published on: November 26, 2014

Cellular Redox Profiling Using High-content Microscopy

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Assessment of Cellular Oxidation using a Subcellular Compartment-Specific Redox-Sensitive Green Fluorescent Protein

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Published on: June 18, 2020

Area of Science:

Microbiology
Molecular Biology
Biochemistry

Background:

The RegB-RegA regulon in Rhodobacter species controls key energy processes.
These processes include photosynthesis, carbon and nitrogen fixation, and respiration.

Purpose of the Study:

To identify the redox signal detected by the RegB sensor kinase.
To understand the regulatory mechanism of the RegB-RegA system.

Main Methods:

The study identifies the ubiquinone pool as the redox signal.
It highlights the role of a redox-active cysteine in RegB autophosphorylation.
It examines the dual activity of RegA (phosphorylated and unphosphorylated forms).

Main Results:

Ubiquinone pool in the membrane is the redox signal sensed by RegB.
A redox-active cysteine in RegB regulates its autophosphorylation.
RegA activates or represses genes in a phosphorylation-dependent manner.

Conclusions:

The RegB-RegA system is a fundamental regulator of redox-controlled gene transcription in bacteria.
Conserved RegB/RegA homologs suggest a broad role in bacterial metabolism and adaptation.
This regulon integrates environmental redox signals to modulate essential cellular functions.