期刊
PLANT SCIENCE
卷 280, 期 -, 页码 12-17出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2018.10.028
关键词
Fumonisin B1; Papain-like cysteine proteases; Programmed cell death; Activity-based protein profiling; RD21; Sphingolipids
资金
- Centre National de la Recherche Scientifique
- University de Toulouse
- French Laboratory of Excellence project TULIP [ANR-10-LABX-41, ANR-11-IDEX-0002-02]
- ERC Consolidator grant [616449]
- French Laboratory of Excellence project SPS [ANR-10-LABX-0040-SPS]
- IFE-STDF [4/2016-2017]
- European Research Council (ERC) [616449] Funding Source: European Research Council (ERC)
It is now well established that sphingoid Long Chain Bases (LCBs) are crucial mediators of programmed cell death. In plants, the mycotoxin fumonisin B1 (FM) produced by the necrotrophic fungus Fusarium moniliforme disrupts the sphingolipid biosynthesis pathway by inhibiting the ceramide synthase leading to an increase in the amount of phytosphingosine (PHS) and dihydrosphingosine (DHS), the two major LCBs in Arabidopsis thaliana. To date, the signaling pathway involved in FB1-induced cell death remains largely uncharacterized. It is also well acknowledged that plant proteases such as papain-like cysteine protease are largely involved in plant immunity. Here, we show that the papain-like cysteine protease RD21 (responsive-to-desiccation-21) is activated in response to PHS and FB1 in Arabidopsis cultured cells and leaves, respectively. Using two allelic null mutants of RD21, and two different PCD bioassays, we demonstrate that the protein acts as a negative regulator of FB1-induced cell death in Arabidopsis.
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