IUBMB Enzyme Nomenclature


Accepted name: linoleate 9S-lipoxygenase

Reaction: linoleate + O2 = (9S,10E,12Z)-9-hydroperoxy-10,12-octadecadienoate

Glossary: linoleate = (9Z,12Z)-octadeca-9,12-dienoate

Other name(s): 9-lipoxygenase; 9S-lipoxygenase; linoleate 9-lipoxygenase; LOX1 (gene name); 9S-LOX

Systematic name: linoleate:oxygen 9S-oxidoreductase

Comments: Contains nonheme iron. A common plant lipoxygenase that oxidizes linoleate and α-linolenate, the two most common polyunsaturated fatty acids in plants, by inserting molecular oxygen at the C9 position with (S)-configuration. The enzyme plays a physiological role during the early stages of seedling growth. The enzyme from Arabidopsis thaliana shows comparable activity towards linoleate and linolenate [4]. EC (linoleate 13S-lipoxygenase) catalyses a similar reaction at another position of these fatty acids.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:


1. Vellosillo, T., Martinez, M., Lopez, M.A., Vicente, J., Cascon, T., Dolan, L., Hamberg, M. and Castresana, C. Oxylipins produced by the 9-lipoxygenase pathway in Arabidopsis regulate lateral root development and defense responses through a specific signaling cascade. Plant Cell 19 (2007) 831-846. [PMID: 17369372]

2. Boeglin, W.E., Itoh, A., Zheng, Y., Coffa, G., Howe, G.A. and Brash, A.R. Investigation of substrate binding and product stereochemistry issues in two linoleate 9-lipoxygenases. Lipids 43 (2008) 979-987. [PMID: 18795358]

3. Andreou, A.Z., Hornung, E., Kunze, S., Rosahl, S. and Feussner, I. On the substrate binding of linoleate 9-lipoxygenases. Lipids 44 (2009) 207-215. [PMID: 19037675]

4. Bannenberg, G., Martinez, M., Hamberg, M. and Castresana, C. Diversity of the enzymatic activity in the lipoxygenase gene family of Arabidopsis thaliana. Lipids 44 (2009) 85-95. [PMID: 18949503]

[EC created 2011]

Return to EC 1.13.11 home page
Return to EC 1.13 home page
Return to EC 1 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page