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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Oxidative conversion of 6-fluorobenzo(c)phenanthrene to its K-region oxide by liver microsomes from 3-methylcholanthrene treated rats: reversal of stereoselectivity of cytochrome P-450c due to the influence of fluoro group.

We have shown earlier that metabolism of carcinogenic 6-fluorobenzo(c)-phenanthrene by liver microsomes of 3-methylcholanthrene treated rats generate K-region oxide as the major metabolite, while no K-region oxide survives in benzo(c)-phenanthrene metabolism under identical conditions. To understand the influence of fluoro group on the generation of K-region oxide from this hydrocarbon, we have determined the enantiomeric composition and absolute configuration of the metabolic 6-fluorobenzo(c)phen-anthrene-7,8-oxide. Interestingly, the microsomal cytochrome P-450c forms predominantly the 5R,6S enantiomer from B(c)Ph, while it exhibits a reversal of stereoselectivity with 6-fluorobenzo(c)phenanthrene forming predominantly the 7S,8R enantiomer. We have attributed this observation to an unfavourable interaction of the fluoro group with the hydrophobic binding pocket of the isozyme.[1]


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