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Type III effector activation via nucleotide binding, phosphorylation, and host target interaction.

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The Pseudomonas syringae effector AvrB targets RIN4 in plants, which is recognized by RPM1 to trigger plant immunity. AvrB activation requires nucleotide binding and phosphorylation, enabling its interaction with RIN4 to initiate defense responses.

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Area of Science:

  • Plant-pathogen interactions
  • Molecular plant-pathology
  • Structural biology

Background:

  • Pseudomonas syringae uses type III effector proteins like AvrB to manipulate host defenses.
  • AvrB targets the Arabidopsis RIN4 protein, a key regulator of basal immunity.
  • The plant immune receptor RPM1 recognizes the AvrB-RIN4 interaction to activate defense.

Purpose of the Study:

  • To elucidate the structural basis of AvrB interaction with RIN4.
  • To understand the role of nucleotide binding and post-translational modifications in AvrB activation.
  • To investigate how AvrB activation and RIN4 binding lead to RPM1-mediated immunity.

Main Methods:

  • X-ray crystallography to determine the structures of AvrB-RIN4 and AvrB-ADP complexes.
  • Site-directed mutagenesis to assess the importance of specific AvrB residues.
  • Biochemical assays to study AvrB phosphorylation and RPM1 activation.

Main Results:

  • The crystal structure of the AvrB-RIN4 complex revealed key interaction interfaces.
  • AvrB structure in complex with ADP identified a nucleotide-binding pocket adjacent to the RIN4 binding site.
  • Mutations in AvrB affecting RIN4 interaction or ADP binding impaired RPM1 activation.
  • AvrB nucleotide-binding residues were essential for phosphorylation by host factors.

Conclusions:

  • AvrB is activated within the plant cell through nucleotide binding and phosphorylation.
  • AvrB activation and RIN4 interaction occur independently.
  • Activated AvrB, bound to RIN4, is indirectly recognized by RPM1, initiating plant immune responses.