Cytochrome P450 family 1 subfamily A member 1 and Cytochrome P450 family 2 subfamily B member 1 (CYP1A1/CYP2B1)

Cytochrome P450 1A1 (CYP1A1) and Cytochrome P450 2B1 (CYP2B1) are critical Phase I enzymes within the cytochrome P450 superfamily, primarily localized in the liver's endoplasmic reticulum. CYP1A1 is highly inducible by polycyclic aromatic hydrocarbons (PAHs) via the aryl hydrocarbon receptor (AhR) and is a major factor in the metabolic activation of environmental pro-carcinogens [UniProt: P04757]. CYP2B1 is a prominent phenobarbital-inducible enzyme, extensively studied in rodent models as a primary metabolizer of various drugs and xenobiotics [PubMed: 2345418]. Together, these enzymes facilitate the oxidation of diverse substrates, playing a dual role in both the detoxification of foreign compounds and the unintended bioactivation of toxins. Their activity levels are significant determinants of individual susceptibility to chemical-induced cancers and the pharmacokinetic behavior of clinical drugs like cyclophosphamide. In pharmaceutical development, they are closely monitored due to their involvement in complex drug-drug interactions and their potential to generate reactive metabolites that cause cellular damage.

Other names

Aryl hydrocarbon hydroxylaseAHHP450-CP450-BCYP1A1CYP2B1

These enzymes catalyze the Phase I oxidative metabolism of xenobiotics and endogenous substrates through reactions such as hydroxylation, N-dealkylation, O-dealkylation, and epoxidation, typically utilizing NADPH and molecular oxygen.