Cytochrome P450
Cytochrome P450 - Related Videos
01:28
Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes
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2026
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,...
07:42
Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c
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Cited by 15 •
2011
In this protocol, we describe the direct cytoplasmic microinjection of cytochrome c protein into fibroblasts and primary sympathetic neurons. This technique allows for the introduction of cytochrome c protein into the cytoplasm of cells and mimics the release of cytochrome c from mitochondria, which occurs during apoptosis.
11:06
Encapsulating Cytochrome c in Silica Aerogel Nanoarchitectures without Metal Nanoparticles while Retaining Gas-phase Bioactivity
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Cited by 1 •
2016
This procedure describes how to encapsulate cytochrome c (cyt. c) in silica (SiO2) sol-gels, process these gels to form bioaerogels, and use these bioaerogels to rapidly recognize nitric oxide (NO) through a gas-phase reaction. This type of protocol may aid in the future development of biosensors or other bioanalytical devices.
06:53
Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase (COX/SDH) Double-labeling Histochemistry
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Cited by 82 •
2011
The cytochrome c oxidase/sodium dehydrogenase (COX/SDH) double-labeling method allows for direct visualization of mitochondrial respiratory enzyme deficiencies in fresh-frozen tissue sections. This is a straightforward histochemical technique and is useful in investigating mitochondrial diseases, aging, and aging-related disorders.
07:38
A General Method for Detecting Nitrosamide Formation in the In Vitro Metabolism of Nitrosamines by Cytochrome P450s
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Cited by 10 •
2017
α-hydroxylation of carcinogenic nitrosamines by cytochrome P450s is the accepted metabolic pathway that produces DNA-damaging intermediates, which cause mutations. However, new data indicates further oxidation to nitrosamides can occur. We describe a general method for detecting nitrosamides produced from in vitro cytochrome P450-catalyzed metabolism of nitrosamines.
FAQs
The reaction’s key chemical outcome is oxygen transfer to a substrate. At the heme iron, molecular oxygen is activated after electrons arrive from NADPH through an associated reductase. One oxygen atom becomes part of the oxidized substrate, while the other forms water. This coupling allows the enzyme family to carry out oxidation reactions involving drugs, hormones, lipids, and foreign chemicals.
NADPH supplies the electrons needed to activate molecular oxygen, while the associated reductase provides the pathway for those electrons to reach the cytochrome P450 system. The heme iron serves as the site where oxygen activation occurs. Together, these components connect cellular reducing power with substrate oxidation, making each component necessary for the overall reaction.
Oxidation enables cytochrome P450 enzymes to act on chemically diverse substrates, including drugs, hormones, lipids, and environmental chemicals. In biology, these reactions support normal processing of endogenous molecules such as hormones and lipids, while also contributing to the breakdown of foreign compounds. The same broad catalytic capability therefore connects physiological metabolism with detoxification.
Variation in cytochrome P450 activity changes how strongly or rapidly a drug is metabolized. That difference can alter the amount of active compound available to produce an effect and can also influence how much exposure contributes to toxicity. Consequently, enzyme activity is one biological source of differences in drug response and related outcomes among individuals.
Examining activity can help researchers evaluate how organisms process drugs, hormones, lipids, and environmental chemicals. It can also reveal whether differences in enzyme function may contribute to altered drug effectiveness, toxicity, or broader biological variation. These observations connect a molecular oxidation reaction with measurable consequences for metabolism and organismal responses.
Cytochrome P450 has roles in steroid biosynthesis, the metabolism of drugs and hormones, lipid processing, detoxification, and the breakdown of environmental chemicals. These functions make the enzyme family relevant to both basic biology and biomedical research. Studying them helps connect biochemical oxidation with hormone production, chemical clearance, therapeutic outcomes, and toxicity.