CYP3A4,5 oxidise AFB1 to AFXBO

Stable Identifier
Reaction [transition]
Homo sapiens
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Aflatoxins are produced by the fungal molds Aspergillus flavus and Aspergillus parasiticus. Dietary contamination accounts for adverse health problems including liver cancer therby classifying aflatoxins as Group 1 carcinogens in humans. The B1 form of aflatoxin (AFB1) is especially carcinogenic in a number of species including humans.
AFB1 requires microsomal oxidation to produce epoxides which are the cause of their toxic and carcinogenic effects. In humans, both CYP3A4 and CYP3A5 are able to produce epoxide stereoisomers of AFB1, the most potent being aflatoxin B1 exo-8,9-oxide (AFXBO) (Gallagher et al. 1996).

Literature References
PubMed ID Title Journal Year
15454734 Increased levels of aflatoxin-albumin adducts are associated with CYP3A5 polymorphisms in The Gambia, West Africa

Wojnowski, L, Turner, PC, Pedersen, B, Hustert, E, Brockmöller, J, Mendy, M, Whittle, HC, Kirk, G, Wild, CP

Pharmacogenetics 2004
8975785 The kinetics of aflatoxin B1 oxidation by human cDNA-expressed and human liver microsomal cytochromes P450 1A2 and 3A4

Gallagher, EP, Kunze, KL, Stapleton, PL, Eaton, DL

Toxicol. Appl. Pharmacol. 1996
Participant Of
Catalyst Activity
Catalyst Activity
monooxygenase activity of Cytochrome P450 (CYP3A5 based) [endoplasmic reticulum membrane]
Physical Entity
Orthologous Events
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