CYP8B1
Function
A cytochrome P450 monooxygenase involved in primary bile acid biosynthesis. Catalyzes the 12alpha-hydroxylation of 7alpha-hydroxy-4-cholesten-3-one, an intermediate metabolite in cholic acid biosynthesis (PubMed:10051404). Controls biliary balance of cholic acid and chenodeoxycholic acid, ultimately regulating the intestinal absorption of dietary lipids (By similarity). Mechanistically, uses molecular oxygen inserting one oxygen atom into a substrate, and reducing the second into a water molecule, with two electrons provided by NADPH via cytochrome P450 reductase (CPR; NADPH--hemoprotein reductase) (By similarity).
Pathway
Lipid metabolism; bile acid biosynthesis.
Sequence Similarities
Belongs to the cytochrome P450 family.
Tissue Specificity
Liver.
Cellular localization
- Endoplasmic reticulum membrane
- Single-pass membrane protein
- Microsome membrane
- Single-pass membrane protein
Alternative names
CYP12, CYP8B1, 7-alpha-hydroxycholest-4-en-3-one 12-alpha-hydroxylase, 7-alpha-hydroxy-4-cholesten-3-one 12-alpha-hydroxylase, CYPVIIIB1, Cytochrome P450 8B1, Sterol 12-alpha-hydroxylase