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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 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...

The Supercomplexes in the Crista Membrane

The Supercomplexes in the Crista Membrane

The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...

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...

Electron Transport Chain: Complex III and IV

Electron Transport Chain: Complex III and IV

During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...

Biosynthesis in Bacteria

Biosynthesis in Bacteria

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Related Experiment Video

Updated: May 22, 2026

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

Published on: October 4, 2019

Complexity generation during natural product biosynthesis using redox enzymes.

Peng Wang¹, Xue Gao, Yi Tang

¹Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, United States.

Current Opinion in Chemical Biology

|May 9, 2012

Summary

Redox enzymes are crucial for natural product biosynthesis, converting basic metabolites into complex structures. This review highlights recently discovered enzymes involved in polyketide and nonribosomal peptide synthesis.

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Last Updated: May 22, 2026

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

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Published on: October 4, 2019

The Logic, Experimental Steps, and Potential of Heterologous Natural Product Biosynthesis Featuring the Complex Antibiotic Erythromycin A Produced Through E. coli

The Logic, Experimental Steps, and Potential of Heterologous Natural Product Biosynthesis Featuring the Complex Antibiotic Erythromycin A Produced Through E. coli

Published on: January 13, 2013

Area of Science:

Biochemistry
Organic Chemistry
Molecular Biology

Background:

Redox enzymes, including FAD-dependent and cytochrome P450 oxygenases, are vital for natural product biosynthesis.
These enzymes modify primary metabolites into essential building blocks and tailor molecular scaffolds into complex final products.

Purpose of the Study:

To review the roles of redox enzymes in natural product biosynthesis.
To discuss recently characterized redox enzymes in the biosynthesis of polyketides and nonribosomal peptides.

Main Methods:

Literature review of recent research on redox enzymes in natural product biosynthesis.
Focus on FAD-dependent and cytochrome P450 oxygenases.

Main Results:

Redox enzymes are essential in both pre-assembly (building block generation) and post-assembly (scaffold tailoring) stages.
Several novel redox enzymes involved in polyketide and nonribosomal peptide pathways have been recently identified.

Conclusions:

Redox enzymes significantly contribute to the structural diversity of natural products.
Understanding these enzymes offers insights into biosynthetic pathways and potential applications.