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- W2808618580 abstract "Cytochrome P450 17A1 (CYP17A1) catalyzes the synthesis of androgens from the steroid precursors pregnenolone and progesterone in a two-step reaction process: allylic hydroxylation and carbo-carbon bond scission. Cytochrome b5 (Cyt-b5 ) is a stimulator of the second lyase reaction, but the chemical mechanism is unclear. We have shown previously that this stimulatory effect requires redox active Cyt-b5 . To investigate the origin of the lyase reaction enhancement by electron transfer from Cyt-b5 , we measured the reduction rates of oxy-ferrous substrate-bound CYP17A1 by Cyt-b5 and by cytochrome P450 reductase (CPR) coincorporated in Nanodiscs using stopped flow spectroscopy. We observed that Cyt-b5 reduces oxy-ferrous CYP17A1 10-fold faster than CPR, with the rate similar to that observed in a ternary complex of all three proteins." @default.
- W2808618580 created "2018-06-21" @default.
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- W2808618580 date "2018-06-21" @default.
- W2808618580 modified "2023-10-10" @default.
- W2808618580 title "Cytochrome <i>b</i> <sub>5</sub> enhances androgen synthesis by rapidly reducing the CYP17A1 oxy-complex in the lyase step" @default.
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- W2808618580 doi "https://doi.org/10.1002/1873-3468.13153" @default.
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