The closed and compact domain organization of the 70-kDa human cytochrome P450 reductase in its oxidized state as revealed by NMR.
The NADPH cytochrome P450 reductase (CPR), a diflavin enzyme, catalyzes the electron transfer (ET) from NADPH to the substrate P450. The crystal structures of mammalian and yeast CPRs show a compact organization for the two domains containing FMN (flavin mononucleotide) and FAD (flavin adenine dinucleotide), with a short interflavin distance consistent with fast ET from the NADPH-reduced FAD to the second flavin FMN. This conformation, referred as "closed", contrasts with the alternative open...Expand abstract
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