The Enzyme Database

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EC 4.2.1.152     
Accepted name: hydroperoxy icosatetraenoate dehydratase
Reaction: a hydroperoxyicosatetraenoate = an oxoicosatetraenoate + H2O
Glossary: (12R)-HPETE = (5Z,8Z,10E,12R,14Z)-12-hydroperoxyicosa-5,8,10,14-tetraenoate
(12S)-HPETE = (5Z,8Z,10E,12S,14Z)-12-hydroperoxyicosa-5,8,10,14-tetraenoate
12-KETE = 12-oxo-ETE = (5Z,8Z,10E,14Z)-12-oxoicosa-5,8,10,14-tetraenoate
(8R)-HPETE = (5Z,8R,9E,11Z,14Z)-8-hydroperoxyicosa-5,9,11,14-tetraenoate
(15R)-HPETE = (5Z,8Z,11Z,13E,15R)-15-hydroperoxyicosa-5,8,11,13-tetraenoate
Other name(s): epidermal lipoxygenase-3 (ambiguous); eLOX3 (ambiguous)
Systematic name: hydroperoxyicosatetraenoate hydro-lyase (oxoicosatetraenoate-forming)
Comments: Binds Fe2+. The mammalian enzymes accept a range of hydroperoxyicosatetraenoates (HPETE). The human enzyme has highest activity with (12R)-HPETE, followed by (12S)-HPETE and (15R)-HPETE with much lower efficiency. The murine enzyme has highest activity with (8R)-HPETE followed by (8S)-HPETE. All HPETE isoforms are converted to the corresponding oxoicosatetraenoate forms (KETE) [2]. The enzymes also catalyse the reaction of EC 5.4.4.7, hydroperoxy icosatetraenoate isomerase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Yu, Z., Schneider, C., Boeglin, W.E., Marnett, L.J. and Brash, A.R. The lipoxygenase gene ALOXE3 implicated in skin differentiation encodes a hydroperoxide isomerase. Proc. Natl. Acad. Sci. USA 100 (2003) 9162–9167. [PMID: 12881489]
2.  Yu, Z., Schneider, C., Boeglin, W.E. and Brash, A.R. Human and mouse eLOX3 have distinct substrate specificities: implications for their linkage with lipoxygenases in skin. Arch. Biochem. Biophys. 455 (2006) 188–196. [PMID: 17045234]
3.  Zheng, Y. and Brash, A.R. Dioxygenase activity of epidermal lipoxygenase-3 unveiled: typical and atypical features of its catalytic activity with natural and synthetic polyunsaturated fatty acids. J. Biol. Chem. 285 (2010) 39866–39875. [PMID: 20921226]
[EC 4.2.1.152 created 2014]
 
 


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