KEGG   ENZYME: 3.3.2.11Help
Entry
EC 3.3.2.11                 Enzyme                                 

Name
cholesterol-5,6-oxide hydrolase;
cholesterol-epoxide hydrolase;
ChEH
Class
Hydrolases;
Acting on ether bonds;
Ether hydrolases
BRITE hierarchy
Sysname
5,6alpha-epoxy-5alpha-cholestan-3beta-ol hydrolase
Reaction(IUBMB)
(1) 5,6alpha-epoxy-5alpha-cholestan-3beta-ol + H2O = 5alpha-cholestane-3beta,5alpha,6beta-triol [RN:R07597];
(2) 5,6beta-epoxy-5beta-cholestan-3beta-ol + H2O = 5alpha-cholestane-3beta,5alpha,6beta-triol [RN:R04792]
Reaction(KEGG)
Substrate
5,6alpha-epoxy-5alpha-cholestan-3beta-ol [CPD:C15992];
H2O [CPD:C00001];
5,6beta-epoxy-5beta-cholestan-3beta-ol [CPD:C05418]
Product
5alpha-cholestane-3beta,5alpha,6beta-triol
Comment
The enzyme appears to work equally well with either epoxide as substrate [3]. The product is a competitive inhibitor of the reaction. In vertebrates, five epoxide-hydrolase enzymes have been identified to date: EC 3.3.2.6 (leukotriene-A4 hydrolase), EC 3.3.2.7 (hepoxilin-epoxide hydrolase), EC 3.3.2.9 (microsomal epoxide hydrolase), EC 3.3.2.10 (soluble epoxide hydrolase) and EC 3.3.2.11 (cholesterol 5,6-oxide hydrolase) [3].
History
EC 3.3.2.11 created 2006
Reference
1  [PMID:6401984]
  Authors
Levin W, Michaud DP, Thomas PE, Jerina DM.
  Title
Distinct rat hepatic microsomal epoxide hydrolases catalyze the hydration of cholesterol 5,6 alpha-oxide and certain xenobiotic alkene and arene oxides.
  Journal
Arch. Biochem. Biophys. 220 (1983) 485-94.
Reference
2  [PMID:6690087]
  Authors
Oesch F, Timms CW, Walker CH, Guenthner TM, Sparrow A, Watabe T, Wolf CR.
  Title
Existence of multiple forms of microsomal epoxide hydrolases with radically different substrate specificities.
  Journal
Carcinogenesis. 5 (1984) 7-9.
Reference
3  [PMID:3941086]
  Authors
Sevanian A, McLeod LL.
  Title
Catalytic properties and inhibition of hepatic cholesterol-epoxide hydrolase.
  Journal
J. Biol. Chem. 261 (1986) 54-9.
Reference
4  [PMID:11154734]
  Authors
Fretland AJ, Omiecinski CJ.
  Title
Epoxide hydrolases: biochemistry and molecular biology.
  Journal
Chem. Biol. Interact. 129 (2000) 41-59.
Reference
5  [PMID:15748653]
  Authors
Newman JW, Morisseau C, Hammock BD.
  Title
Epoxide hydrolases: their roles and interactions with lipid metabolism.
  Journal
Prog. Lipid. Res. 44 (2005) 1-51.
Other DBs
ExplorEnz - The Enzyme Database: 
IUBMB Enzyme Nomenclature: 
ExPASy - ENZYME nomenclature database: 
BRENDA, the Enzyme Database: 

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