This enzyme is required for electron transfer from NADP to cytochrome P450 in microsomes. It can also provide electron transfer to heme oxygenase and cytochrome B5. Defects in POR are the cause of Antley-Bixler syndrome with genital anomalies and disordered steroidogenesis (ABS1). A disease characterized by the association of Antley-Bixler syndrome with steroidogenesis defects and abnormal genitalia. Antley-Bixler syndrome is characterized by craniosynostosis, radiohumeral synostosis present from the perinatal period, midface hypoplasia, choanal stenosis or atresia, femoral bowing and multiple joint contractures. Defects in POR are the cause of disordered steroidogenesis due to cytochrome P450 oxidoreductase deficiency (DISPORD). A disorder resulting in a rare variant of congenital adrenal hyperplasia, with apparent combined P450C17 and P450C21 deficiency and accumulation of steroid metabolites. Affected girls are born with ambiguous genitalia, but their circulating androgens are low and virilization does not progress. Conversely, affected boys are sometimes born undermasculinized. Boys and girls can present with bone malformations, in some cases resembling the pattern seen in patients with Antley-Bixler syndrome. Note: This description may include information from UniProtKB.
Molecular Function: oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen, NADH or NADPH as one donor, and incorporation of one atom of oxygen; protein binding; enzyme binding; FAD binding; electron carrier activity; FMN binding; hydrolase activity; NADPH-hemoprotein reductase activity; nitric oxide dioxygenase activity; cytochrome-b5 reductase activity; iron ion binding; NADP binding; iron-cytochrome-c reductase activity
Biological Process: response to drug; nitric oxide catabolic process; internal peptidyl-lysine acetylation; positive regulation of monooxygenase activity; positive regulation of cholesterol biosynthetic process; negative regulation of caspase activity; negative regulation of lipase activity; nitrate catabolic process; positive regulation of chondrocyte differentiation; flavonoid metabolic process; positive regulation of smoothened signaling pathway; carnitine metabolic process; fatty acid oxidation; response to nutrient
LTP: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.