This view shows enzymes only for those organisms listed below, in the list of taxa known to possess the pathway. If an enzyme name is shown in bold, there is experimental evidence for this enzymatic activity.
Synonyms: 9-LOX and 9-AOS pathway
|Superclasses:||Biosynthesis → Secondary Metabolites Biosynthesis → Fatty Acid Derivatives Biosynthesis|
Expected Taxonomic Range: Viridiplantae
Lipoxygenases (LOX) are ubiquitous enzymes in eukaryotes. Depending on the positional specificities, they are further classified as 9-LOX and 13-LOX, converting poly unsaturated fatty acids to 9-hydroperoxides and 13-hydroperoxides, respectively. In plants, most reported LOXs are 13-LOXs, which are important in the biosynthesis of plant hormone jasmonic acid.
Interestingly, potato has strong 9-lipoxygenase (9-LOX) activity. The preferred substrates for these enzymes are linoleate and α-linolenate, and the resulting products are the hydroperoxides (9S)-HPODE and 9(S)-HPOTE, respectively.
The major metabolic products from these hydroperoxides are divinyl ethers and epoxy alcohols, obtained via the activities of divinyl ether biosynthesis I (DES) and epoxy alcohol synthase (EAS), respectively. Divinyl ethers and epoxy alcohols are potato defense compounds (see divinyl ether biosynthesis I).
In addition to DES and EAS, a 9-allene oxide synthase (9-AOS) activity has been reported. To date, 9-AOS has only been detected in a few plants including tomato, barley and potato. The limited tissue distribution of 9-AOS suggested a specialized function in plant development control, rather than ubiquitous defensive roles as DES and EAS. It was shown that the α-ketol produced from (9S)-HPODE in Lemna paucicostata and Ipomoea nil functions as a component of a flower-inducing factor.
Superpathways: superpathway of lipoxygenase
Fonseca09: Fonseca S, Chini A, Hamberg M, Adie B, Porzel A, Kramell R, Miersch O, Wasternack C, Solano R (2009). "(+)-7-iso-Jasmonoyl-L-isoleucine is the endogenous bioactive jasmonate." Nat Chem Biol 5(5);344-50. PMID: 19349968
Gobel01: Gobel C, Feussner I, Schmidt A, Scheel D, Sanchez-Serrano J, Hamberg M, Rosahl S (2001). "Oxylipin profiling reveals the preferential stimulation of the 9-lipoxygenase pathway in elicitor-treated potato cells." J Biol Chem 276(9);6267-73. PMID: 11085991
Guranowski07: Guranowski A, Miersch O, Staswick PE, Suza W, Wasternack C (2007). "Substrate specificity and products of side-reactions catalyzed by jasmonate:amino acid synthetase (JAR1)." FEBS Lett 581(5);815-20. PMID: 17291501
Kongrit06: Kongrit D, Jisaka M, Kobayasi K, Nishigaichi Y, Nishimura K, Nagaya T, Yokota K (2006). "Molecular cloning, functional expression, and tissue distribution of a potato sprout allene oxide synthase involved in a 9-lipoxygenase pathway." Biosci Biotechnol Biochem 70(9);2160-8. PMID: 16960383
Stumpe01: Stumpe M, Kandzia R, Gobel C, Rosahl S, Feussner I (2001). "A pathogen-inducible divinyl ether synthase (CYP74D) from elicitor-treated potato suspension cells." FEBS Lett 507(3);371-6. PMID: 11696374
Bachmann02: Bachmann A, Hause B, Maucher H, Garbe E, Voros K, Weichert H, Wasternack C, Feussner I (2002). "Jasmonate-induced lipid peroxidation in barley leaves initiated by distinct 13-LOX forms of chloroplasts." Biol Chem 383(10);1645-57. PMID: 12452441
Boeglin08: Boeglin WE, Itoh A, Zheng Y, Coffa G, Howe GA, Brash AR (2008). "Investigation of substrate binding and product stereochemistry issues in two linoleate 9-lipoxygenases." Lipids 43(11);979-87. PMID: 18795358
Hughes01: Hughes RK, West SI, Hornostaj AR, Lawson DM, Fairhurst SA, Sanchez RO, Hough P, Robinson BH, Casey R (2001). "Probing a novel potato lipoxygenase with dual positional specificity reveals primary determinants of substrate binding and requirements for a surface hydrophobic loop and has implications for the role of lipoxygenases in tubers." Biochem J 353(Pt 2);345-55. PMID: 11139400
Royo96: Royo J, Vancanneyt G, Perez AG, Sanz C, Stormann K, Rosahl S, Sanchez-Serrano JJ (1996). "Characterization of three potato lipoxygenases with distinct enzymatic activities and different organ-specific and wound-regulated expression patterns." J Biol Chem 271(35);21012-9. PMID: 8702864
Vellosillo07: Vellosillo T, Martinez M, Lopez MA, Vicente J, Cascon T, Dolan L, Hamberg M, Castresana C (2007). "Oxylipins produced by the 9-lipoxygenase pathway in Arabidopsis regulate lateral root development and defense responses through a specific signaling cascade." Plant Cell 19(3);831-46. PMID: 17369372
©2014 SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025-3493