Abstract
Cytochrome P-450 was purified to a content of over 17 nmoles per mg of protein from liver microsomes of phenobarbital-treated rabbits by fractionation with polyethylene glycol 6000, DEAE-cellulose column chromatography, and hydroxylapatite column chromatography in the presence of Renex 690, a nonionic detergent. The purified preparation exhibited a single polypeptide band (molecular weight, 49,000 daltons) when submitted to SDS-polyacrylamide gel electrophoresis. Cytochromes P-420 and b 5 and NADPH-cytochrome c reductase were absent. The reconstituted system containing purified cytochrome P-450, reductase, and phosphatidylcholine catalyzed the hydroxylation of benzphetamine, cyclohexane, aniline, and laurate.
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