4.8 Article

A paralogous decoy protects Phytophthora sojae apoplastic effector PsXEG1 from a host inhibitor

Journal

SCIENCE
Volume 355, Issue 6326, Pages 710-714

Publisher

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aai7919

Keywords

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Funding

  1. China National Funds for Distinguished Young Scientists [31225022]
  2. Key Program of the National Natural Science Foundation of China [31430073]
  3. Special Lad for Agro-scientific Research in the Public Interest [201303018]
  4. China Agriculture Research System [CARS-004-PS14]
  5. 111 International Cooperation grant from the Chinese government [B07030]
  6. National Research Initiative of the U.S. Department of Agriculture National Institute of Food and Agriculture [2011-68004-30104, 2010-65110-20764]
  7. Interdisciplinary Ph. D. Program in Genetics
  8. NIFA [580962, 2010-65110-20764] Funding Source: Federal RePORTER

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The extracellular space (apoplast) of plant tissue represents a critical battleground between plants and attacking microbes. Here we show that a pathogen-secreted apoplastic xyloglucan-specific endoglucanase, PsXEG1, is a focus of this struggle in the Phytophthora sojae-soybean interaction. We show that soybean produces an apoplastic glucanase inhibitor protein, GmGIP1, that binds to PsXEG1 to block its contribution to virulence. P. sojae, however, secretes a paralogous PsXEG1-like protein, PsXLP1, that has lost enzyme activity but binds to GmGIP1 more tightly than does PsXEG1, thus freeing PsXEG1 to support P. sojae infection. The gene pair encoding PsXEG1 and PsXLP1 is conserved in many Phytophthora species, and the P. parasitica orthologs PpXEG1 and PpXLP1 have similar functions. Thus, this apoplastic decoy strategy may be widely used in Phytophthora pathosystems.

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