期刊
PHYTOCHEMISTRY
卷 122, 期 -, 页码 45-55出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2015.11.015
关键词
Chloroplast; Alkenone reductase; Reactive electrophile species; gamma-Ketols; Jasmonate; Oxylipin
资金
- French National Research Agency GRAL Labex [ANR-10-LABX-49-01]
- Russian Academy of Sciences
- Labex GRAL (Alliance Grenobloise pour la Biologie Structurale et Cellulaire integrees)
Under oxidative stress conditions the lipid constituents of cells can undergo oxidation whose frequent consequence is the production of highly reactive alpha,beta-unsaturated carbonyls. These molecules are toxic because they can add to biomolecules (such as proteins and nucleic acids) and several enzyme activities cooperate to eliminate these reactive electrophile species. CeQORH (chloroplast envelope Quinone Oxidoreductase Homolog, At4g13010) is associated with the inner membrane of the chloroplast envelope and imported into the organelle by an alternative import pathway. In the present study, we show that the recombinant ceQORH exhibits the activity of a NADPH-dependent alpha,beta-unsaturated oxoene reductase reducing the double bond of medium-chain (C >= 9) to long-chain (18 carbon atoms) reactive electrophile species deriving from poly-unsaturated fatty acid peroxides. The best substrates of ceQORH are 13-lipoxygenase-derived gamma-ketols. gamma-Ketols are spontaneously produced in the chloroplast from the unstable allene oxide formed in the biochemical pathway leading to 12-oxo-phytodienoic acid, a precursor of the defense hormone jasmonate. In chloroplasts, ceQORH could detoxify 13-lipoxygenase-derived gamma-ketols at their production sites in the membranes. This finding opens new routes toward the understanding of gamma-ketols role and detoxification. (C) 2015 Elsevier Ltd. All rights reserved.
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