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Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes

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Cytochrome P450 (CYP450) enzymes are a superfamily of heme-containing monooxygenases that play a pivotal role in Phase I drug metabolism by catalyzing oxidation and reduction reactions.These enzymes transform lipophilic xenobiotics into more hydrophilic metabolites, facilitating subsequent Phase II conjugation and eventual excretion. The CYP450 family is classified into families (e.g., CYP1–CYP3) and subfamilies (e.g., CYP2A, CYP2C), based on amino acid sequence homology.CYP450 isoenzymes,...

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Related Experiment Video

Updated: May 14, 2026

Mass Spectrometry and Luminogenic-based Approaches to Characterize Phase I Metabolic Competency of In Vitro Cell Cultures

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[Current methods of cytochrome p450 analysis].

N E Moskaleva, V G Zgoda

Biomeditsinskaia Khimiia

|January 29, 2013

Summary

This review covers modern proteomic techniques for evaluating cytochrome P450s (CYP450s) concentration and activity. It highlights methods for quantitative and qualitative analysis of CYP450 isoforms and their enzymatic functions.

Area of Science:

Biochemistry
Molecular Biology
Pharmacology

Context:

Cytochrome P450 enzymes (CYP450s) are crucial for drug metabolism and detoxification.
Accurate assessment of CYP450s concentration and activity is vital in drug development and clinical practice.

Purpose:

To review contemporary proteomic approaches for evaluating CYP450s.
To discuss methods for quantitative and qualitative analysis of CYP450 isoforms.
To explore enzyme activity measurement techniques and their correlation with CYP450 content.

Summary:

The review details advanced proteomic techniques, including electrophoresis and liquid chromatography-mass spectrometry (LC-MS), for CYP450 analysis.
It covers targeted proteomic strategies for precise quantification and identification of CYP450s in biological matrices.

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Methods for measuring specific enzyme activities and their relationship with isoform abundance are critically examined.

Impact:

Provides a comprehensive overview of state-of-the-art CYP450 assessment methodologies.
Facilitates the selection of appropriate techniques for research and clinical applications involving CYP450s.
Enhances understanding of the link between CYP450 expression levels and enzymatic function, aiding in personalized medicine and drug efficacy studies.