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Role of cytochrome b in the oxidative metabolism of polychlorinated biphenyls catalyzed by cytochrome P450

Xenobiotica, ISSN: 0049-8254, Vol: 26, Issue: 4, Page: 405-414
1996
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Article Description

The role of cytochrome b in the cytochrome P450-dependent hydroxylation of tetrachlorobiphenyl (TCB) isomers was examined using a reconstituted system consisting of CYP2B1 and CYP1A1 and rat liver microsomes. By addition of cytochrome b to the reconstituted system containing CYP2B1, the 3-hydroxylation of 2,5,2,'5'- and 2,5,3',4'-TCB was increased about six-fold, but the 3- and 5-hydroxylation of 2,4,3',4'-TCB was decreased by about 50%. All hydroxylations of 3,4,3',4'-, 2,5,3',4'- and 2,4,3',4'-TCBs were decreased by addition of cytochrome b to the reconstituted system containing CYP1A1. In stoichiometry measurements, changes in NADPH oxidation and coupling efficiency by addition of cytochrome b was observed and these differed according to the position of chlorine atoms of TCBs and cytochrome P450 isoforms used in the systems.

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