Prostacyclin synthase

prostaglandin-I synthase
Cartoon diagram of human prostacyclin synthase. Heme group visible at center. From PDB: 2IAG​
Identifiers
EC number	5.3.99.4
CAS number	65802-86-0
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Gene Ontology	AmiGO / EGO
Search PMC articles PubMed articles NCBI proteins

PTGIS
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 3B6H, 2IAG
Identifiers
Aliases	PTGIS, CYP8, CYP8A1, PGIS, PTGI, prostaglandin I2 (prostacyclin) synthase
External IDs	OMIM: 601699 MGI: 1097156 HomoloGene: 37374 GeneCards: PTGIS
Gene ontology Molecular function • iron ion binding • isomerase activity • metal ion binding • monooxygenase activity • protein binding • heme binding • oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen • prostaglandin-I synthase activity Cellular component • cytoplasm • integral component of membrane • endoplasmic reticulum membrane • membrane • caveola • nucleus • endoplasmic reticulum • extracellular space Biological process • prostaglandin metabolic process • positive regulation of execution phase of apoptosis • cellular response to interleukin-6 • lipid metabolic process • icosanoid metabolic process • cyclooxygenase pathway • fatty acid metabolic process • positive regulation of angiogenesis • fatty acid biosynthetic process • negative regulation of nitric oxide biosynthetic process • decidualization • cellular response to interleukin-1 • positive regulation of peroxisome proliferator activated receptor signaling pathway • apoptotic signaling pathway • negative regulation of NF-kappaB transcription factor activity • negative regulation of inflammatory response • oxidation-reduction process • cellular response to hypoxia • embryo implantation • prostaglandin biosynthetic process • NAD biosynthesis via nicotinamide riboside salvage pathway Sources:Amigo / QuickGO
Orthologs
Species	Human	Mouse
Entrez	5740	19223
Ensembl	ENSG00000124212	ENSMUSG00000017969
UniProt	Q16647	O35074
RefSeq (mRNA)	NM_000961	NM_008968
RefSeq (protein)	NP_000952	NP_032994.1 NP_032994
Location (UCSC)	Chr 20: 49.5 – 49.57 Mb	Chr 2: 167.19 – 167.24 Mb
PubMed search
Wikidata
View/Edit Human		View/Edit Mouse

Prostaglandin-I synthase (EC 5.3.99.4) also known as prostaglandin I2 (prostacyclin) synthase (PTGIS) or CYP8A1 is an enzyme involved in prostanoid biosynthesis that in humans is encoded by the PTGIS gene. This enzyme belongs to the family of cytochrome P450 isomerases.

Function

This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. However, this protein is considered a member of the cytochrome P450 superfamily on the basis of sequence similarity rather than functional similarity. This endoplasmic reticulum membrane protein catalyzes the conversion of prostaglandin H₂ to prostacyclin (prostaglandin I₂), a potent vasodilator and inhibitor of platelet aggregation. An imbalance of prostacyclin and its physiological antagonist thromboxane A₂ contribute to the development of myocardial infarction, stroke, and atherosclerosis.

Unlike most P450 enzymes, PGIS does not require molecular oxygen (O₂). Instead it uses its heme cofactor to catalyze the isomerization of prostaglandin H₂ to prostacyclin. Prostaglandin H₂ is produced by cyclooxygenase in the first committed step of prostaglandin biosynthesis.

Nomenclature

The systematic name of this enzyme class is (5Z,13E)-(15S)-9alpha,11alpha-epidioxy-15-hydroxyprosta-5,13-dienoate 6-isomerase. Other names in common use include prostacyclin synthase, prostacyclin synthetase, prostagladin I₂ synthetase, PGI₂ synthase, PGIS, PTGIS, and PGI₂ synthetase.

Pathways

Thromboxane synthesis

Eicosanoid synthesis.

See also

• Prostanoid

Further reading

• DeWitt DL, Smith WL (1983). "Purification of prostacyclin synthase from bovine aorta by immunoaffinity chromatography. Evidence that the enzyme is a hemoprotein". J. Biol. Chem. 258 (5): 3285–93. PMID 6338016. 
• Ullrich V, Castle L, Weber P (1981). "Spectral evidence for the cytochrome P450 nature of prostacyclin synthetase". Biochem. Pharmacol. 30 (14): 2033–6. doi:10.1016/0006-2952(81)90218-5. PMID 7023490. 
• Xie X, Ma YT, Fu ZY, et al. (2008). "[Study on the association of cyclooxygenase-2 -765g>C and prostacyclin synthase C1117A polymorphisms and the risk of myocardial infarction in Uigur population of Xinjiang, China]". Zhonghua Liu Xing Bing Xue Za Zhi. 29 (6): 598–603. PMID 19040046. 
• Yoshida T, Kato K, Yokoi K, et al. (2009). "Association of genetic variants with chronic kidney disease in individuals with different lipid profiles.". Int. J. Mol. Med. 24 (2): 233–46. doi:10.3892/ijmm_00000226. PMID 19578796. 
• Palmieri RT, Wilson MA, Iversen ES, et al. (2008). "Polymorphism in the IL18 gene and epithelial ovarian cancer in non-Hispanic white women.". Cancer Epidemiol. Biomarkers Prev. 17 (12): 3567–72. doi:10.1158/1055-9965.EPI-08-0548. PMC 2664299. PMID 19064572. 
• Mavaddat N, Dunning AM, Ponder BA, et al. (2009). "Common genetic variation in candidate genes and susceptibility to subtypes of breast cancer.". Cancer Epidemiol. Biomarkers Prev. 18 (1): 255–9. doi:10.1158/1055-9965.EPI-08-0704. PMC 2655077. PMID 19124506. 
• Xie X, Ma YT, Fu ZY, et al. (2009). "[Association of GLu461ALa polymorphism of prostacyclin synthase gene with myocardial infarction in Uigur population]". Zhonghua Yu Fang Yi Xue Za Zhi. 43 (3): 237–41. PMID 19534932. 
• Yoshida T, Kato K, Fujimaki T, et al. (2009). "Association of a polymorphism of the apolipoprotein E gene with chronic kidney disease in Japanese individuals with metabolic syndrome.". Genomics. 93 (3): 221–6. doi:10.1016/j.ygeno.2008.11.001. PMID 19056482. 
• Dagle JM, Lepp NT, Cooper ME, et al. (2009). "Determination of genetic predisposition to patent ductus arteriosus in preterm infants.". Pediatrics. 123 (4): 1116–23. doi:10.1542/peds.2008-0313. PMC 2734952. PMID 19336370. 
• Xie X, Ma Y, Fu Z, et al. (2008). "[Association of polymorphism of the prostacyclin synthase gene with myocardial infarction in Uigur population of Xinjiang]". Zhonghua Yi Xue Yi Chuan Xue Za Zhi. 25 (6): 708–11. PMID 19065539. 
• Nelson DR, Zeldin DC, Hoffman SM, et al. (2004). "Comparison of cytochrome P450 (CYP) genes from the mouse and human genomes, including nomenclature recommendations for genes, pseudogenes and alternative-splice variants.". Pharmacogenetics. 14 (1): 1–18. doi:10.1097/00008571-200401000-00001. PMID 15128046. 
• Barbali M, Naranci NS, Skari-Juri T, et al. (2009). "A quantitative trait locus for SBP maps near KCNB1 and PTGIS in a population isolate.". Am. J. Hypertens. 22 (6): 663–8. doi:10.1038/ajh.2009.46. PMID 19265782. 
• Xie X, Ma YT, Fu ZY, et al. (2009). "Association of polymorphisms of PTGS2 and CYP8A1 with myocardial infarction.". Clin. Chem. Lab. Med. 47 (3): 347–52. doi:10.1515/CCLM.2009.078. PMID 19327107. 
• Abraham JE, Harrington P, Driver KE, et al. (2009). "Common polymorphisms in the prostaglandin pathway genes and their association with breast cancer susceptibility and survival.". Clin. Cancer Res. 15 (6): 2181–91. doi:10.1158/1078-0432.CCR-08-0716. PMID 19276290. 
• Ruan KH, Wu J, Cervantes V (2008). "Characterization of the substrate mimic bound to engineered prostacyclin synthase in solution using high-resolution NMR spectroscopy and mutagenesis: implication of the molecular mechanism in biosynthesis of prostacyclin.". Biochemistry. 47 (2): 680–8. doi:10.1021/bi701671q. PMID 18081314. 
• Hashimoto K, Ishibashi K, Gebretsadik T, et al. (2008). "Functional polymorphism of the promoter region of the prostacyclin synthase gene and severity of RSV infection in hospitalized children.". J. Med. Virol. 80 (11): 2015–22. doi:10.1002/jmv.21318. PMID 18814254. 
• Xiang Xie; Ma YT; Fu ZY; et al. (2009). "Haplotype analysis of the CYP8A1 gene associated with myocardial infarction.". Clin. Appl. Thromb. Hemost. 15 (5): 574–80. doi:10.1177/1076029608329581. PMID 19147528. 
• Lemaitre RN, Rice K, Marciante K, et al. (2009). "Variation in eicosanoid genes, non-fatal myocardial infarction and ischemic stroke.". Atherosclerosis. 204 (2): e58–63. doi:10.1016/j.atherosclerosis.2008.10.011. PMC 2753183. PMID 19046748. 
• Ito T, Okada T, Mimuro J, et al. (2007). "Adenoassociated virus-mediated prostacyclin synthase expression prevents pulmonary arterial hypertension in rats.". Hypertension. 50 (3): 531–6. doi:10.1161/HYPERTENSIONAHA.107.091348. PMID 17635855. 
• Ma YT, Xie X, Fu ZY, et al. (2009). "[Haplotypes analysis of the prostacyclin synthase gene and myocardial infarction in Uigur population]". Zhonghua Xin Xue Guan Bing Za Zhi. 37 (2): 115–9. PMID 19719985. 
• Yeh HC, Gerfen GJ, Wang JS, et al. (2009). "Characterization of the peroxidase mechanism upon reaction of prostacyclin synthase with peracetic acid. Identification of a tyrosyl radical intermediate.". Biochemistry. 48 (5): 917–28. doi:10.1021/bi801382v. PMC 2849756. PMID 19187034. 
• Young RP, Hopkins RJ, Hay BA, et al. (2009). "A gene-based risk score for lung cancer susceptibility in smokers and ex-smokers.". Postgrad Med J. 85 (1008): 515–24. doi:10.1136/pgmj.2008.077107. PMID 19789190. 

External links

• prostacyclin synthetase at the US National Library of Medicine Medical Subject Headings (MeSH)

This article incorporates text from the United States National Library of Medicine, which is in the public domain.