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- W2119962489 abstract "The AvrPto protein from Pseudomonas syringae pv tomato is delivered into plant cells by the bacterial type III secretion system, where it either promotes host susceptibility or, in tomato plants expressing the Pto kinase, elicits disease resistance. Using two-dimensional gel electrophoresis, we obtained evidence that AvrPto is phosphorylated when expressed in plant leaves. In vitro phosphorylation of AvrPto by plant extracts occurs independently of Pto and is due to a kinase activity that is conserved in tomato (Solanum lycopersicum), tobacco (Nicotiana tabacum), and Arabidopsis thaliana. Three Ser residues clustered in the C-terminal 18 amino acids of AvrPto were identified in vitro as putative phosphorylation sites, and one site at S149 was directly confirmed as an in vivo phosphorylation site by mass spectrometry. Substitution of Ala for S149 significantly decreased the ability of AvrPto to enhance disease symptoms and promote growth of P. s. tomato in susceptible tomato leaves. In addition, S149A significantly decreased the avirulence activity of AvrPto in resistant tomato plants. Our observations support a model in which AvrPto has evolved to mimic a substrate of a highly conserved plant kinase to enhance its virulence activity. Furthermore, residues of AvrPto that promote virulence are also monitored by plant defenses." @default.
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- W2119962489 date "2006-01-06" @default.
- W2119962489 modified "2023-10-13" @default.
- W2119962489 title "Host-Mediated Phosphorylation of Type III Effector AvrPto Promotes <i>Pseudomonas</i> Virulence and Avirulence in Tomato" @default.
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- W2119962489 doi "https://doi.org/10.1105/tpc.105.036590" @default.
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