Catalyzes the side-chain cleavage reaction of cholesterol to pregnenolone. Defects in CYP11A1 are the cause of adrenal insufficiency congenital with 46,XY sex reversal (AICSR). A rare disorder that can present as acute adrenal insufficiency in infancy or childhood. ACTH and plasma renin activity are elevated and adrenal steroids are inappropriately low or absent; the 46,XY patients have female external genitalia, sometimes with clitoromegaly. The phenotypic spectrum ranges from prematurity, complete underandrogenization, and severe early-onset adrenal failure to term birth with clitoromegaly and later-onset adrenal failure. Patients with congenital adrenal insufficiency do not manifest the massive adrenal enlargement typical of congenital lipoid adrenal hyperplasia. Belongs to the cytochrome P450 family. Note: This description may include information from UniProtKB.
Molecular Function: cholesterol monooxygenase (side-chain-cleaving) activity; heme binding; iron ion binding; 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
Biological Process: C21-steroid hormone biosynthetic process; cholesterol metabolic process; glucocorticoid biosynthetic process; sterol metabolic process; vitamin D metabolic process
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.