Abstract
Cytochrome P-450 was isolated in highly purified form from liver microsomes of adult male rabbits treated with 2,3,7,8-tetrachlorodibenzo- p -dioxin (TCDD). Preparations average 17.8 ± 0.8 nmoles cytochrome P-450 per mg protein and have an estimated molecular weight of 54,500. The visible absorption spectrum of the purified cytochrome displays absorption spectral maxima characteristic of high spin forms of cytochrome P-450. When reconstituted with highly purified NADPH-cytochrome P-450 reductase, this cytochrome catalyzes the hydroxylation of acetanilide and the O-deethylation of 7-ethoxyresorufin, two activities induced by TCDD.
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