iTRAQ-based quantitative proteomics reveals a ferroptosis-like programmed cell death in plants infected by a highly virulent tobacco mosaic virus mutant 24A+UPD

Phytopathology Research - 2020
Mercy Macharia1, Prem Prakash Das1, Naweed I. Naqvi1, Sek-Man Wong1
1Department of Biological Sciences, National University of Singapore, Singapore, 119543, Singapore

Tóm tắt

AbstractPlants trigger a highly orchestrated defence mechanism in response to viral infection. In this study, we aimed at understanding the molecular events that lead to more accelerated cell death in Nicotiana benthamiana plants infected with the fast-replicating TMV 24A + UPD in comparison to TMV. TMV 24A + UPD is an artificial mutant that induces more severe symptoms leading to precocious death in plants. We employed the iTRAQ-based quantitative proteomics approach to identify and map the proteomes of TMV and TMV 24A + UPD infected plants at time points that correlate with initiation of early cell death symptoms. TMV 24A + UPD proteome profile revealed 183 highly abundant proteins versus 71 for TMV infected plants. KEGG analysis revealed differentially abundant proteins in the two proteome profiles under cell death, stress signalling, protein folding, sorting, degradation, transport and catabolism. We identified unique differentially abundant proteins in the TMV 24A + UPD profile, in particular under the ferroptosis and glutathione metabolism pathways. For validation, we varied the amount of intracellular iron by supplementing plants with Fe3+, employing iron chelators and by virus induced gene silencing of iron storage protein ferritin gene. We also employed potent ferroptosis inhibitors ferostatin-1, liprostatin-1, and transiently silenced glutathione peroxidase 4 gene. TMV 24A + UPD infected plants showed accelerated cell death symptoms when intracellular iron was increased. Decreasing intracellular iron protected the plants from accelerated cell death. We also observed a decrease in TMV 24A + UPD induced cell death when we applied ferroptosis inhibitors. Glutathione peroxidase 4 gene-silenced plants showed enhanced cell death compared to non-silenced control plants. Our study uncovered a link between intracellular iron and accelerated lipid ROS-induced cell death in TMV 24A + UPD infected plants. We propose that the fast-replicating mutant of TMV induces a distinct and potent form of cell death akin to ferroptosis.

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