Matches in SemOpenAlex for { <https://semopenalex.org/work/W2045490130> ?p ?o ?g. }
- W2045490130 endingPage "2595" @default.
- W2045490130 startingPage "2579" @default.
- W2045490130 abstract "Mutations in NADPH P450 oxidoreductase (POR) cause a broad spectrum of human disease with abnormalities in steroidogenesis. We have studied the impact of P450 reductase mutations on the activity of CYP19A1. POR supported CYP19A1 activity with a calculated Km of 126 nm for androstenedione and a Vmax of 1.7 pmol/min. Mutations R457H and V492E located in the FAD domain of POR that disrupt electron transfer caused a complete loss of CYP19A1 activity. The A287P mutation of POR decreased the activities of CYP17A1 by 60-80% but had normal CYP19A1 activity. Molecular modeling and protein docking studies suggested that A287P is involved in the interaction of POR:CYP17A1 but not in the POR:CYP19A1 interaction. Mutations C569Y and V608F in the NADPH binding domain of POR had 49 and 28% of activity of CYP19A1 compared with normal reductase and were more sensitive to the amount of NADPH available for supporting CYP19A1 activity. Substitution of NADH for NADPH had a higher impact on C569Y and V608F mutants of POR. Similar effects were obtained at low/high (5.5/8.5) pH, but using octanol to limit the flux of electrons from POR to CYP19A1 inhibited activity supported by all variants. High molar ratios of KCl also reduced the CYP19A1 supporting activities of C569Y and V608F mutants of POR to a greater extent compared to normal POR and A287P mutant. Because POR supports many P450s involved in steroidogenesis, bone formation, and drug metabolism, variations in the effects of POR mutations on specific enzyme activities may explain the broad clinical spectrum of POR deficiency." @default.
- W2045490130 created "2016-06-24" @default.
- W2045490130 creator A5024262855 @default.
- W2045490130 creator A5029064922 @default.
- W2045490130 creator A5058200538 @default.
- W2045490130 creator A5059064156 @default.
- W2045490130 creator A5077460315 @default.
- W2045490130 date "2007-10-01" @default.
- W2045490130 modified "2023-09-24" @default.
- W2045490130 title "Modulation of Human CYP19A1 Activity by Mutant NADPH P450 Oxidoreductase" @default.
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