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Phase I Oxidative Reactions: Overview01:19

Phase I Oxidative Reactions: Overview

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Phase I biotransformation, or functionalization, is a crucial chemical process that converts drugs and other xenobiotics into more water-soluble forms, facilitating expulsion from the body. It involves oxidative, reductive, and hydrolytic reactions that add or unveil polar functional groups on lipophilic substrates. Key players in phase I reactions are the mixed-function oxidases. Situated in liver cell microsomes, these enzymes predominantly carry out drug metabolism. They require molecular...
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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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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
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The energy released from the breakdown of the chemical bonds within nutrients can be stored either through the reduction of electron carriers or in the bonds of adenosine triphosphate (ATP). In living systems, a small class of compounds functions as mobile electron carriers, molecules that bind to and shuttle high-energy electrons between compounds in pathways. The principal electron carriers that will be considered originate from the B vitamin group and are derivatives of nucleotides; they are...
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Related Experiment Video

Updated: Nov 21, 2025

Monitoring the Reductive and Oxidative Half-Reactions of a Flavin-Dependent Monooxygenase using Stopped-Flow Spectrophotometry
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New frontiers in flavin-dependent monooxygenases.

Renata A G Reis1, Hao Li1, Maxim Johnson1

  • 1Department of Biochemistry, Blacksburg, VA, 24061, USA.

Archives of Biochemistry and Biophysics
|January 18, 2021
PubMed
Summary

Flavin-dependent monooxygenases (FMOs) are crucial for natural product synthesis and biological redox reactions. Recent research advances FMO chemistry, exploring dynamics, reactive species, and novel N-oxidase catalysis with biomedical implications.

Keywords:
AntibioticsConformational changesDrug targetFlavin motionsHomolytic bond cleavageMonooxygenationOxygen activation

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Area of Science:

  • Biochemistry
  • Enzymology
  • Organic Chemistry

Background:

  • Flavin-dependent monooxygenases (FMOs) are vital enzymes catalyzing diverse redox reactions and natural product biosynthesis.
  • Despite extensive research, fundamental aspects of FMO chemistry, including reaction mechanisms and dynamics, remain incompletely understood.

Purpose of the Study:

  • To review recent advancements in flavin-dependent monooxygenase research.
  • To highlight novel catalytic activities, particularly in N-oxidation, and discuss their biological and biomedical significance.

Main Methods:

  • Literature review of recent studies on flavin-dependent monooxygenases.
  • Analysis of research on flavin dynamics, reactive intermediates, and hydroxylation mechanisms.
  • Discussion of novel N-oxidase catalysis and its implications.

Main Results:

  • Recent studies have shed light on flavin dynamics, reactive species stabilization, and hydroxylation mechanisms in FMOs.
  • Novel catalysis by flavin-dependent N-oxidases, producing oximes and nitrones from amines, has been identified.
  • The role of FMOs in pathogen virulence and antibiotic resistance has been elucidated.

Conclusions:

  • Continued research on FMOs is crucial for understanding complex biological processes and natural product synthesis.
  • FMOs represent promising targets for therapeutic intervention, particularly in combating antibiotic resistance.
  • The discovery of novel FMO catalytic activities expands their known biochemical repertoire and potential applications.