Center for Bioinformatics
Oxidoreductases | Transferases | Hydrolases | Lyases | Isomerases | Ligases

Basic Information

Enzyme Number

Official Name

leukotriene-A4 hydrolase

Name from literature

leukotriene a4 hydrolase

Pathway from literature

biosynthesis of leukotriene B4

Pathway from KEGG

Lipid Metabolism; Arachidonic acid metabolism; map00590


Mouse (10090)

Genome localization

10 C3[16993 ],


This is a bifunctional zinc metalloprotease that displays both epoxide hydrolase and aminopeptidase activities [4,6]. It preferentially cleaves tripeptides at an arginyl bond, with dipeptides and tetrapeptides being poorer substrates [6] (see EC, aminopeptidase B). It also converts leukotriene A4 into leukotriene B4, unlike EC, soluble epoxide hydrolase, which converts leukotriene A4 into 5,6-dihydroxy-7,9,11,14-icosatetraenoic acid [3,4]. 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) [3].

Rate-limiting Description

"The enzyme LTA(4) hydrolase represents an attractive target for pharmacological intervention in these disease states, since the action of this enzyme is the rate-limiting step in the production of LTB(4)." (12139459)

Regulatory Information

Regulatory type




Gene ontology

Gene ontology

GO:0008270 (F) zinc ion binding [P24527 ];
GO:0006508 (P) proteolysis [P24527 ];
GO:0008237 (F) metallopeptidase activity [P24527 ];
GO:0004463 (F) leukotriene-A4 hydrolase activity [P24527 ];
GO:0019370 (P) leukotriene biosynthetic process [P24527 ];
GO:0005737 (C) cytoplasm [P24527 ];

Subcellular localization


cytoplasm [P24527 ];




Entrez Gene


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  Last Modified: 2009-03-24  
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