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• W2141825656 startingPage "10139" @default.
• W2141825656 abstract "In humans, the precursor to all steroid hormones, pregnenolone, is synthesized from cholesterol by an enzyme complex comprising adrenodoxin reductase (AdR), adrenodoxin (Adx), and a cytochrome P450 (P450scc or CYP11A1). This complex not only plays a key role in steroidogenesis, but also has long been a model to study electron transfer, multistep catalysis, and C–C bond cleavage performed by monooxygenases. Detailed mechanistic understanding of these processes has been hindered by a lack of structural information. Here we present the crystal structure of the complex of human Adx and CYP11A1—the first of a complex between a eukaryotic CYP and its redox partner. The structures with substrate and a series of reaction intermediates allow us to define the mechanism underlying sequential hydroxylations of the cholesterol and suggest the mechanism of C–C bond cleavage. In the complex the [2Fe-2S] cluster of Adx is positioned 17.4 Å away from the heme iron of CYP11A1. This structure suggests that after an initial protein–protein association driven by electrostatic forces, the complex adopts an optimized geometry between the redox centers. Conservation of the interaction interface suggests that this mechanism is common for all mitochondrial P450s." @default.
• W2141825656 created "2016-06-24" @default.
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• W2141825656 date "2011-06-02" @default.
• W2141825656 modified "2023-10-11" @default.
• W2141825656 title "Structural basis for pregnenolone biosynthesis by the mitochondrial monooxygenase system" @default.
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• W2141825656 doi "https://doi.org/10.1073/pnas.1019441108" @default.
• W2141825656 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3121847" @default.
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• W2141825656 hasPublicationYear "2011" @default.
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