Functional divergence of two secreted immune proteases of tomato

Ilyas, Muhammad, Hörger, Anja C., Bozkurt, Tolga O., Van Den Burg, Harrold A., Kaschani, Farnusch, Kaiser, Markus, Belhaj, Khaoula, Smoker, Matthew, Joosten, Matthieu H. A. J., Kamoun, Sophien ORCID: and van der Hoorn, Renier A. L. (2015) Functional divergence of two secreted immune proteases of tomato. Current Biology, 25 (17). pp. 2300-2306. ISSN 0960-9822

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Rcr3 and Pip1 are paralogous secreted papain-like proteases of tomato. Both proteases are inhibited by Avr2 from the fungal pathogen Cladosporium fulvum, but only Rcr3 acts as a co-receptor for Avr2 recognition by the tomato Cf-2 immune receptor [1-4]. Here, we show that Pip1-depleted tomato plants are hyper-susceptible to fungal, bacterial, and oomycete plant pathogens, demonstrating that Pip1 is an important broad-range immune protease. By contrast, in the absence of Cf-2, Rcr3 depletion does not affect fungal and bacterial infection levels but causes increased susceptibility only to the oomycete pathogen Phytophthora infestans. Rcr3 and Pip1 reside on a genetic locus that evolved over 36 million years ago. These proteins differ in surface-exposed residues outside the substrate-binding groove, and Pip1 is 5- to 10-fold more abundant than Rcr3. We propose a model in which Rcr3 and Pip1 diverged functionally upon gene duplication, possibly driven by an arms race with pathogen-derived inhibitors or by coevolution with the Cf-2 immune receptor detecting inhibitors of Rcr3, but not of Pip1.

Item Type: Article
Uncontrolled Keywords: apoplast,cladosporium fulvum,cys protease,immunity,phytophthora infestans,tomato
Faculty \ School: Faculty of Science > The Sainsbury Laboratory
Faculty of Science > School of Biological Sciences
UEA Research Groups: Faculty of Science > Research Groups > Plant Sciences
Related URLs:
Depositing User: Pure Connector
Date Deposited: 01 Jun 2016 12:00
Last Modified: 04 May 2024 01:35
DOI: 10.1016/j.cub.2015.07.030

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