Cytochrome P450 2B (CYP2B)

Cytochrome P450 2B (CYP2B) refers to a subfamily of cytochrome P450 enzymes, which are heme-containing monooxygenases active in the metabolism of a wide variety of both endogenous compounds (such as steroids) and xenobiotics, including drugs and environmental chemicals[1][2]. CYP2B enzymes, such as CYP2B6 in humans and CYP2B4 in rabbits, are primarily found in the liver and are notable for their capacity to metabolize a broad range of chemically diverse substrates due to their structurally plastic and highly adaptable active sites[1]. These enzymes catalyze oxidation reactions by inserting a single oxygen atom from molecular oxygen into their substrates, a process requiring electron transfer from NADPH via cytochrome P450 reductase[2][3]. CYP2B enzymes play a clinically important role in drug metabolism and pharmacogenetics, with polymorphisms in genes such as CYP2B6 affecting individual responses to multiple drugs and contributing to variation in drug efficacy and toxicity[1]. Besides their role in drug clearance, CYP2B enzymes can also bioactivate certain drugs and environmental chemicals to toxic or carcinogenic metabolites. They are considered major therapeutic targets in drug development and toxicity prediction, and are subject to both inhibition and induction by many pharmaceuticals, giving them a key role in drug–drug interactions[1][2].

Other names

CYP2B subfamilyCytochrome P450 family 2 subfamily BCYP2B4 (rabbit isoform, commonly used as structural model)CYP2B6 (human isoform)

Oxidation of substrates via monooxygenation (insertion of an oxygen atom), Metabolic activation or inactivation of drugs, Generation of reactive intermediates (e.g., through bioactivation of prodrugs or formation of toxic metabolites)