Cytochrome P450 4F8

Definition:

A cytochrome P450 monooxygenase involved in the metabolism of endogenous polyunsaturated fatty acids (PUFAs) and their oxygenated derivatives (oxylipins). 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-ferrihemoprotein reductase). Catalyzes the hydroxylation of carbon hydrogen bonds, with preference for omega-1 and omega-2 positions. Hydroxylates (5Z,8Z,11Z,14Z)-eicosatetraenoic acid (arachidonate) predominantly at omega-2 position to form (18R)-hydroxyeicosatetraenoic acid (18R-HETE). Exhibits omega-1 hydroxylase activity toward prostaglandin (PG) H1, PGH2 and PGI2. Catalyzes the epoxidation of double bonds of PUFAs, including docosahexaenoic and docosapentaenoic acids. Shows little activity against PGD2, PGE1, PGE2, PGF2alpha, and leukotriene B4.

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