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A Bacterial Tyrosine Phosphatase Inhibits Plant Pattern Recognition Receptor Activation

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Science  28 Mar 2014:
Vol. 343, Issue 6178, pp. 1509-1512
DOI: 10.1126/science.1248849

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Receptors on plant cell surfaces are tuned to recognize molecular patterns associated with pathogenic bacteria. Macho et al. (p. 1509; published online 13 March) found that activation of one of these receptors in Arabidopsis results in phosphorylation of a specific tyrosine residue, which in turn triggers the plant's immune response to the phytopathogen Pseudomonas syringae. P. syringae counters by secreting a specifically targeted phosphatase, thus stalling the plant's immune response.

Abstract

Innate immunity relies on the perception of pathogen-associated molecular patterns (PAMPs) by pattern-recognition receptors (PRRs) located on the host cell’s surface. Many plant PRRs are kinases. Here, we report that the Arabidopsis receptor kinase EF-TU RECEPTOR (EFR), which perceives the elf18 peptide derived from bacterial elongation factor Tu, is activated upon ligand binding by phosphorylation on its tyrosine residues. Phosphorylation of a single tyrosine residue, Y836, is required for activation of EFR and downstream immunity to the phytopathogenic bacterium Pseudomonas syringae. A tyrosine phosphatase, HopAO1, secreted by P. syringae, reduces EFR phosphorylation and prevents subsequent immune responses. Thus, host and pathogen compete to take control of PRR tyrosine phosphorylation used to initiate antibacterial immunity.

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