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FUNCTION A cytochrome P450 monooxygenase involved in the metabolism of fatty acids and their oxygenated derivatives (oxylipins) (PubMed:10553002, PubMed:10660572, PubMed:15611369, PubMed:1739747, PubMed:7679927, PubMed:8914854). 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) (PubMed:10553002, PubMed:10660572, PubMed:15611369, PubMed:1739747, PubMed:7679927, PubMed:8914854). Catalyzes predominantly the oxidation of the terminal carbon (omega-oxidation) of saturated and unsaturated fatty acids, the catalytic efficiency decreasing in the following order: dodecanoic > tetradecanoic > (9Z)-octadecenoic > (9Z,12Z)-octadecadienoic > hexadecanoic acid (PubMed:10553002, PubMed:10660572). Acts as a major omega-hydroxylase for dodecanoic (lauric) acid in liver (PubMed:15611369, PubMed:1739747, PubMed:7679927, PubMed:8914854). Participates in omega-hydroxylation of (5Z,8Z,11Z,14Z)-eicosatetraenoic acid (arachidonate) to 20-hydroxyeicosatetraenoic acid (20-HETE), a signaling molecule acting both as vasoconstrictive and natriuretic with overall effect on arterial blood pressure (PubMed:10620324, PubMed:10660572, PubMed:15611369). Can also catalyze the oxidation of the penultimate carbon (omega-1 oxidation) of fatty acids with lower efficiency (PubMed:7679927). May contribute to the degradation of saturated very long-chain fatty acids (VLCFAs) such as docosanoic acid, by catalyzing successive omega-oxidations to the corresponding dicarboxylic acid, thereby initiating chain shortening (PubMed:18182499). Omega-hydroxylates (9R,10S)-epoxy-octadecanoate stereoisomer (PubMed:15145985). Plays a minor role in omega-oxidation of long-chain 3-hydroxy fatty acids (PubMed:18065749). Has little activity toward prostaglandins A1 and E1 (PubMed:7679927).CATALYTIC ACTIVITY an organic molecule + reduced [NADPH--hemoprotein reductase] + O2 = an alcohol + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)CATALYTIC ACTIVITY an omega-methyl-long-chain fatty acid + reduced [NADPH--hemoprotein reductase] + O2 = an omega-hydroxy-long-chain fatty acid + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)CATALYTIC ACTIVITY dodecanoate + reduced [NADPH--hemoprotein reductase] + O2 = 12-hydroxydodecanoate + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)CATALYTIC ACTIVITY tetradecanoate + reduced [NADPH--hemoprotein reductase] + O2 = 14-hydroxytetradecanoate + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)CATALYTIC ACTIVITY hexadecanoate + reduced [NADPH--hemoprotein reductase] + O2 = 16-hydroxyhexadecanoate + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)CATALYTIC ACTIVITY (9Z)-octadecenoate + reduced [NADPH--hemoprotein reductase] + O2 = 18-hydroxy-(9Z)-octadecenoate + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)CATALYTIC ACTIVITY (5Z,8Z,11Z,14Z)-eicosatetraenoate + reduced [NADPH--hemoprotein reductase] + O2 = 20-hydroxy-(5Z,8Z,11Z,14Z)-eicosatetraenoate + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)CATALYTIC ACTIVITY 22-hydroxydocosanoate + reduced [NADPH--hemoprotein reductase] + O2 = 22-oxodocosanoate + oxidized [NADPH--hemoprotein reductase] + 2 H2O + H(+)CATALYTIC ACTIVITY 22-oxodocosanoate + reduced [NADPH--hemoprotein reductase] + O2 = docosanedioate + oxidized [NADPH--hemoprotein reductase] + H2O + 2 H(+)CATALYTIC ACTIVITY (9R,10S)-epoxy-octadecanoate + reduced [NADPH--hemoprotein reductase] + O2 = 18-hydroxy-(9R,10S)-epoxy-octadecanoate + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)CATALYTIC ACTIVITY 3-hydroxyhexadecanoate + reduced [NADPH--hemoprotein reductase] + O2 = 3,16-dihydroxyhexadecanoate + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)COFACTOR Activated by cytochrome b5.BIOPHYSICOCHEMICAL PROPERTIES kcat is 42 min(-1) with dodecanoic acid as substrate. kcat is 50 min(-1) with tetradecanoic acid as substrate. kcat is 10 min(-1) with hexadecanoic acid as substrate. kcat is 0.4 min(-1) with (9Z)-octadecenoic acid as substrate. kcat is 0.4 min(-1) with (5Z,8Z,11Z,14Z)-eicosatetraenoic acid as substrate.PATHWAY Lipid metabolism; arachidonate metabolism.PATHWAY Lipid metabolism; oxylipin biosynthesis.SUBCELLULAR LOCATION Expressed in liver (PubMed:7679927). Expressed in S2 and S3 segments of proximal tubules in cortex and outer medulla of kidney (PubMed:10660572, PubMed:7679927).POLYMORPHISM CYP4A11v seems to be a rare allelic variant of CYP4A11, it seems to be unstable and not to metabolize lauric acid.SIMILARITY Belongs to the cytochrome P450 family.ONLINE INFORMATION CYP4A11 alleles
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