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Ptr ToxA requires multiple motifs for complete activity.

Viola A Manning1, Rachael M Andrie, Aaron F Trippe

  • 1Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331, USA.

Molecular Plant-Microbe Interactions : MPMI
|May 15, 2004
PubMed
Summary

The wheat pathogen Pyrenophora tritici-repentis toxin Ptr ToxA causes necrosis via specific structural features. Mutations affecting casein kinase 2 phosphorylation and a vitronectin-like motif significantly reduce its toxicity.

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Area of Science:

  • Plant Pathology
  • Molecular Biology
  • Biochemistry

Background:

  • Ptr ToxA is the first identified protein toxin from Pyrenophora tritici-repentis, a wheat pathogen.
  • The mechanism by which Ptr ToxA induces necrosis in susceptible wheat is currently unknown.

Purpose of the Study:

  • To elucidate the structural requirements of Ptr ToxA for necrosis induction.
  • To identify key functional motifs within the Ptr ToxA protein.

Main Methods:

  • Site-directed mutagenesis was used to alter conserved motifs in the Ptr ToxA active domain.
  • Peptide inhibition studies were conducted to assess the role of specific amino acid regions.
  • Mutant proteins were evaluated for their ability to induce necrosis.

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Main Results:

  • Mutations at potential casein kinase 2 phosphorylation sites significantly reduced Ptr ToxA activity.
  • Mutations in a vitronectin-like motif (homologous to the RGD motif) also resulted in significantly reduced activity.
  • Peptide competition confirmed the importance of the vitronectin-like motif, and competition with mutant proteins showed the necessity of multiple motifs for full Ptr ToxA activity.

Conclusions:

  • Specific structural features, including casein kinase 2 phosphorylation sites and a vitronectin-like motif, are essential for Ptr ToxA's necrosis-inducing activity.
  • Multiple functional motifs are required for the full toxic effect of Ptr ToxA in wheat.