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Updated: Jul 5, 2026
12:08
Monitoring the Reductive and Oxidative Half-Reactions of a Flavin-Dependent Monooxygenase using Stopped-Flow Spectrophotometry
Published on: March 18, 2012
Flavin-containing monooxygenases: mutations, disease and drug response
Ian R Phillips1, Elizabeth A Shephard
1School of Biological and Chemical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK.
Trends in Pharmacological Sciences
|April 22, 2008
Summary
Flavin-containing monooxygenases (FMOs) are crucial for drug and chemical metabolism. Genetic variations in FMOs significantly impact human health, disease susceptibility, and drug response.
Area of Science:
- Biochemistry
- Pharmacology
- Human Genetics
Background:
- Flavin-containing monooxygenases (FMOs) are critical enzymes involved in metabolizing a wide range of xenobiotics, including pharmaceuticals, pesticides, and dietary compounds.
- FMOs play a vital role in mediating human interactions with their chemical environment.
- Understanding FMO function and structure provides insights into xenobiotic metabolism and its implications.
Purpose of the Study:
- To elucidate the mechanism of action of FMOs, drawing on structural insights from yeast FMO.
- To focus on human FMOs (FMO1, FMO2, and FMO3) most relevant to xenobiotic metabolism.
- To investigate the role of FMOs and their genetic variants in human diseases and drug responses.
Main Methods:
- Review of FMO mechanism of action and structural data.
- Focus on FMO1, FMO2, and FMO3 in human xenobiotic metabolism.
- Analysis of genetic variants and their association with disease and drug response.
Main Results:
- Loss-of-function mutations in FMO3 lead to the metabolic disorder trimethylaminuria.
- Common FMO variants that reduce enzyme activity are linked to enhanced drug efficacy.
- Most humans possess an inactive FMO2 due to a common nonsense mutation, but functional FMO2 is present in a significant sub-Saharan African population.
Conclusions:
- Genetic variations in FMOs significantly influence individual responses to drugs and foreign chemicals.
- FMO3 mutations cause trimethylaminuria, while other variants affect drug efficacy.
- The presence of functional FMO2 in certain populations suggests differential drug metabolism and response, highlighting the importance of pharmacogenetics.
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