Cytochrome P450 superfamily (CYP450)

The Cytochrome P450 (CYP450) superfamily is a large and diverse group of heme-containing enzymes that play a central role in the oxidative metabolism of a wide range of endogenous and exogenous compounds (Guengerich, 2008). While major isoforms such as CYP3A4 and CYP2D6 are well-known for their role in drug clearance, the category of "Other CYP450 enzymes" encompasses numerous isoforms like CYP1A2, CYP2C9, CYP2C19, and CYP2E1, which are vital for the biotransformation of specific drugs and environmental toxins (Lynch & Price, 2007). These enzymes are primarily localized in the liver but are also found in extrahepatic tissues, where they facilitate the conversion of lipophilic substances into water-soluble metabolites (UniProt, 2024). Beyond drug metabolism, many CYP enzymes are involved in critical physiological processes, including the synthesis of steroid hormones, cholesterol, and vitamin D (NIH, 2023). In the context of pharmacology, these enzymes are significant due to their high degree of genetic polymorphism and their susceptibility to inhibition or induction by other drugs, which can lead to profound drug-drug interactions (FDA, 2020). Understanding the activity and variability of these enzymes is essential for personalized medicine and for minimizing the risk of adverse drug reactions in clinical settings (StatPearls, 2023).

Other names

CYPP450Heme-thiolate monooxygenasesMicrosomal hydroxylasesMixed-function oxidases

Drugs interact with these enzymes as substrates for oxidative biotransformation, or as inhibitors and inducers that modulate enzymatic activity and expression levels (Guengerich, 2008).