Abstract
Summary The NADPH-supported metabolism of chlorobenzene has been studied with a reconstituted hydroxylation system from rat liver microsomes. The maximal rate of metabolism required the presence of cytochrome P-450, NADPH-cytochrome c reductase, lipid, and cytochrome b 5 . In contrast, cytochrome b 5 was not required for the NADPH-supported cytochrome P-448-dependent hydroxylation of chlorobenzene. Thus, it appears that a conclusion as to whether cytochrome b 5 is or is not involved in NADPH-supported microsomal hydroxylation reactions is dependent not only on the specific reaction studied, but also on the particular hemeprotein catalyzing the reaction.
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More From: Biochemical and Biophysical Research Communications
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