The Enzyme Database

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Accepted name: microsomal epoxide hydrolase
Reaction: cis-stilbene oxide + H2O = (+)-(1R,2R)-1,2-diphenylethane-1,2-diol
Other name(s): epoxide hydratase (ambiguous); microsomal epoxide hydratase (ambiguous); epoxide hydrase; microsomal epoxide hydrase; arene-oxide hydratase (ambiguous); benzo[a]pyrene-4,5-oxide hydratase; benzo(a)pyrene-4,5-epoxide hydratase; aryl epoxide hydrase (ambiguous); cis-epoxide hydrolase; mEH
Systematic name: cis-stilbene-oxide hydrolase
Comments: This is a key hepatic enzyme that is involved in the metabolism of numerous xenobiotics, such as 1,3-butadiene oxide, styrene oxide and the polycyclic aromatic hydrocarbon benzo[a]pyrene 4,5-oxide [5–7]. In a series of oxiranes with a lipophilic substituent of sufficient size (styrene oxides), monosubstituted as well as 1,1- and cis-1,2-disubstituted oxiranes serve as substrates or inhibitors of the enzyme. However, trans-1,2-disubstituted, tri-and tetra-substituted oxiranes are not substrates [9]. The reaction involves the formation of an hydroxyalkyl—enzyme intermediate [10]. In vertebrates, five epoxide-hydrolase enzymes have been identified to date: EC (leukotriene-A4 hydrolase), EC (hepoxilin-epoxide hydrolase), EC (microsomal epoxide hydrolase), EC (soluble epoxide hydrolase) and EC (cholesterol-5,6-oxide hydrolase) [7].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Jakoby, W.B. and Fjellstedt, T.A. Epoxidases. In: Boyer, P.D. (Ed.), The Enzymes, 3rd edn, vol. 7, Academic Press, New York, 1972, pp. 199–212.
2.  Lu, A.Y., Ryan, D., Jerina, D.M., Daly, J.W. and Levin, W. Liver microsomal expoxide hydrase. Solubilization, purification, and characterization. J. Biol. Chem. 250 (1975) 8283–8288. [PMID: 240858]
3.  Oesch, F. Purification and specificity of a human microsomal epoxide hydratase. Biochem. J. 139 (1974) 77–88. [PMID: 4463951]
4.  Oesch, F. and Daly, J. Solubilization, purification, and properties of a hepatic epoxide hydrase. Biochim. Biophys. Acta 227 (1971) 692–697. [PMID: 4998715]
5.  Bellucci, G., Chiappe, C. and Ingrosso, G. Kinetics and stereochemistry of the microsomal epoxide hydrolase-catalyzed hydrolysis of cis-stilbene oxides. Chirality 6 (1994) 577–582. [PMID: 7986671]
6.  Morisseau, C. and Hammock, B.D. Epoxide hydrolases: mechanisms, inhibitor designs, and biological roles. Annu. Rev. Pharmacol. Toxicol. 45 (2005) 311–333. [PMID: 15822179]
7.  Fretland, A.J. and Omiecinski, C.J. Epoxide hydrolases: biochemistry and molecular biology. Chem. Biol. Interact. 129 (2000) 41–59. [PMID: 11154734]
8.  Oesch, F. Mammalian epoxide hydrases: inducible enzymes catalysing the inactivation of carcinogenic and cytotoxic metabolites derived from aromatic and olefinic compounds. Xenobiotica 3 (1973) 305–340. [PMID: 4584115]
9.  Lacourciere, G.M. and Armstrong, R.N. Microsomal and soluble epoxide hydrolases are members of the same family of C-X bond hydrolase enzymes. Chem. Res. Toxicol. 7 (1994) 121–124. [PMID: 8199297]
10.  Newman, J.W., Morisseau, C. and Hammock, B.D. Epoxide hydrolases: their roles and interactions with lipid metabolism. Prog. Lipid Res. 44 (2005) 1–51. [PMID: 15748653]
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