Prostaglandin-I synthase (EC5.3.99.4) also known as prostaglandin I2 (prostacyclin) synthase (PTGIS) or CYP8A1 is an enzyme involved in prostanoid biosynthesis that in humans is encoded by the PTGISgene.[4] This enzyme belongs to the family of cytochrome P450isomerases.
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 H2toprostacyclin (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.[5]
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.
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.
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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. PMID18081314.
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. PMID18814254. S2CID6010576.
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. PMID19719985.
