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Functional Characterization of CYP94-Genes and Identification of a Novel Jasmonate Catabolite in Flowers
- Source :
- PLoS ONE, Vol 11, Iss 7, p e0159875 (2016), PLoS ONE
- Publication Year :
- 2016
- Publisher :
- Public Library of Science (PLoS), 2016.
-
Abstract
- Over the past decades much research focused on the biosynthesis of the plant hormone jasmonyl-isoleucine (JA-Ile). While many details about its biosynthetic pathway as well about its physiological function are established nowadays, knowledge about its catabolic fate is still scarce. Only recently, the hormonal inactivation mechanisms became a stronger research focus. Two major pathways have been proposed to inactivate JA-Ile: i) The cleavage of the jasmonyl-residue from the isoleucine moiety, a reaction that is catalyzed by specific amido-hydrolases, or ii), the sequential oxidation of the ω-end of the pentenyl side-chain. This reaction is catalyzed by specific members of the cytochrome P450 (CYP) subfamily CYP94: CYP94B1, CYP94B3 and CYP94C1. In the present study, we further investigated the oxidative fate of JA-Ile by expanding the analysis on Arabidopsis thaliana mutants, lacking only one (cyp94b1, cyp94b2, cyp94b3, cyp94c1), two (cyp94b1xcyp94b2, cyp94b1xcyp94b3, cyp94b2xcyp94b3), three (cyp94b1xcyp94b2xcyp94b3) or even four (cyp94b1xcyp94b2xcyp94b3xcyp94c1) CYP94 functionalities. The results obtained in the present study show that CYP94B1, CYP94B2, CYP94B3 and CYP94C1 are responsible for catalyzing the sequential ω-oxidation of JA-Ile in a semi-redundant manner. While CYP94B-enzymes preferentially hydroxylate JA-Ile to 12-hydroxy-JA-Ile, CYP94C1 catalyzes primarily the subsequent oxidation, yielding 12-carboxy-JA-Ile. In addition, data obtained from investigating the triple and quadruple mutants let us hypothesize that a direct oxidation of unconjugated JA to 12-hydroxy-JA is possible in planta. Using a non-targeted metabolite fingerprinting analysis, we identified unconjugated 12-carboxy-JA as novel jasmonate derivative in floral tissues. Using the same approach, we could show that deletion of CYP94-genes might not only affect JA-homeostasis but also other signaling pathways. Deletion of CYP94B1, for example, led to accumulation of metabolites that may be characteristic for plant stress responses like systemic acquired resistance. Evaluation of the in vivo function of the different CYP94-enzymes on the JA-sensitivity demonstrated that particularly CYP94B-enzymes might play an essential role for JA-response, whereas CYP94C1 might only be of minor importance. Open-Access-Publikationsfonds 2016 peerReviewed
- Subjects :
- Leaves
Ionization
Flowers
Flowering plants
Arabidopsis thaliana
Metabolites
Jasmonic acid
Oxidation
Arabidopsis Thaliana
Arabidopsis
lcsh:Medicine
Cyclopentanes
Plant Science
Brassica
Genes, Plant
Research and Analysis Methods
Biochemistry
Model Organisms
Cytochrome P-450 Enzyme System
Plant and Algal Models
Homeostasis
Oxylipins
Plant Hormones
lcsh:Science
Flowering Plants
Arabidopsis Proteins
Plant Biochemistry
Plant Anatomy
lcsh:R
Organisms
Chemical Reactions
Biology and Life Sciences
Plants
Hormones
Chemistry
Metabolism
Mutation
Jasmonic Acid
Physical Sciences
lcsh:Q
Gene Deletion
Signal Transduction
Research Article
Subjects
Details
- Language :
- English
- ISSN :
- 19326203
- Volume :
- 11
- Issue :
- 7
- Database :
- OpenAIRE
- Journal :
- PLoS ONE
- Accession number :
- edsair.pmid.dedup....d7d70a5f01d3a3767873ac0e1528b1a1