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- W2068339036 abstract "7-Dehydrocholesterol reductase (DHCR7) catalyzes the final step in cholesterol synthesis. The enzyme utilizes NADPH as a source of electrons and has been reported to require NADPH-cytochrome P450 reductase (POR) as its redox partner. To test this hypothesis, microsomes were prepared from the livers of mice in which hepatic cytochrome P450 reductase expression was extinguished during maturation. These microsomes contained negligible levels of POR but had 2.5-fold greater DHCR7 activity than did microsomes from wild-type mice. Consistent with this greater activity, immunoblot analysis of DHCR7 expression indicated that DHCR7 protein levels were elevated 2-fold in POR-null microsomes. Addition of POR to these microsomes provided no stimulation of DHCR7 activity, confirming the lack of a role for POR in DHCR7 activity. Because the original observation that POR was necessary for DHCR7 activity was based, in part, on antibody inhibition studies with POR antibody, the ability of an antibody to the full-length POR protein to inhibit DHCR7 activity and cytochrome c reductase activity was tested; the antibody had no effect on DHCR7 activity but decreased cytochrome c reductase activity (a POR-catalyzed reaction) by 50%. Immunoblot analysis further demonstrated no cross-reactivity between POR and DHCR7 with antibodies to either protein. We conclude that cytochrome P450 reductase is not involved in 7-dehydrocholesterol reductase activity." @default.
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- W2068339036 date "2011-11-01" @default.
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- W2068339036 title "7-Dehydrocholesterol reductase activity is independent of cytochrome P450 reductase" @default.
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- W2068339036 doi "https://doi.org/10.1016/j.jsbmb.2011.06.011" @default.
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