Sphingolipid-induced cell death in Arabidopsis is negatively regulated by the papain-like cysteine protease RD21

•RD21 is activated in Arabidopis cultured cell in response to PHS.•RD21 is activated in Arabidopsis leaves in response to fumonisin B1.•RD21 behaves as a negative regulator of sphingolipid-induced cell death. It is now well established that sphingoid Long Chain Bases (LCBs) are crucial mediators of...

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Bibliographic Details
Published in:Plant science (Limerick) 2019-03, Vol.280, p.12-17
Main Authors: Ormancey, Mélanie, Thuleau, Patrice, van der Hoorn, Renier A.L., Grat, Sabine, Testard, Ambroise, Kamal, Khaled Y., Boudsocq, Marie, Cotelle, Valérie, Mazars, Christian
Format: Article
Language:English
Subjects:
Activity-based protein profiling
Fumonisin B1
Life Sciences
Papain-like cysteine proteases
Programmed cell death
RD21
Sphingolipids
Vegetal Biology
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Summary:•RD21 is activated in Arabidopis cultured cell in response to PHS.•RD21 is activated in Arabidopsis leaves in response to fumonisin B1.•RD21 behaves as a negative regulator of sphingolipid-induced cell death. It is now well established that sphingoid Long Chain Bases (LCBs) are crucial mediators of programmed cell death. In plants, the mycotoxin fumonisin B1 (FB1) 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.
ISSN:0168-9452
1873-2259
DOI:10.1016/j.plantsci.2018.10.028