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- W2155156659 abstract "Abstract Programmed cell death (PCD) is triggered when Pto, a Ser-Thr protein kinase, recognizes either the AvrPto or AvrPtoB effector from Pseudomonas syringae pv tomato. This PCD requires mitogen-activated protein kinase kinase kinase (MAPKKK α ) as a positive regulator in tomato (Solanum lycopersicum) and Nicotiana benthamiana. To examine how PCD-eliciting activity of the tomato MAPKKK α protein is regulated, we screened for MAPKKK α -interacting proteins in tomato and identified a 14-3-3 protein, TFT7. Virus-induced gene silencing using the TFT7 gene in N. benthamiana compromised both Pto- and MAPKKK α -mediated PCD, and coexpression of TFT7 with tomato MAPKKK α enhanced MAPKKK α -mediated PCD. TFT7 was also required for PCD associated with several other disease resistance proteins and contributed to resistance against P. syringae pv tomato. Coexpression of TFT7 with MAPKKK α in vivo caused increased accumulation of the kinase and enhanced phosphorylation of two MAP kinases. TFT7 protein contains a phosphopeptide binding motif that is present in human 14-3-3 ε, and substitutions in this motif abolished interaction with MAPKKK α in vivo and also the PCD-enhancing activity of TFT7. A 14-3-3 binding motif, including a putative phosphorylated Ser-535, is present in the C-terminal region of MAPKKK α. An S535A substitution in MAPKKK α reduced interaction with TFT7 and both PCD-eliciting ability and stability of MAPKKK α. Our results provide new insights into a role for 14-3-3 proteins in regulating immunity-associated PCD pathways in plants." @default.
- W2155156659 created "2016-06-24" @default.
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- W2155156659 date "2010-01-01" @default.
- W2155156659 modified "2023-10-14" @default.
- W2155156659 title "Tomato 14-3-3 Protein 7 Positively Regulates Immunity-Associated Programmed Cell Death by Enhancing Protein Abundance and Signaling Ability of MAPKKK α " @default.
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- W2155156659 doi "https://doi.org/10.1105/tpc.109.070664" @default.
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