Abstract:
:Plant diseases caused by fungi and oomycetes pose an increasing threat to food security and ecosystem health worldwide. These filamentous pathogens, while taxonomically distinct, modulate host defense responses by secreting effectors, which are typically identified based on the presence of signal peptides. Here we show that Phytophthora sojae and Verticillium dahliae secrete isochorismatases (PsIsc1 and VdIsc1, respectively) that are required for full pathogenesis. PsIsc1 and VdIsc1 can suppress salicylate-mediated innate immunity in planta and hydrolyse isochorismate in vitro. A conserved triad of catalytic residues is essential for both functions. Thus, the two proteins are isochorismatase effectors that disrupt the plant salicylate metabolism pathway by suppressing its precursor. Furthermore, these proteins lack signal peptides, but exhibit characteristics that lead to unconventional secretion. Therefore, this secretion pathway is a novel mechanism for delivering effectors and might play an important role in host-pathogen interactions.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Liu T,Song T,Zhang X,Yuan H,Su L,Li W,Xu J,Liu S,Chen L,Chen T,Zhang M,Gu L,Zhang B,Dou Ddoi
10.1038/ncomms5686subject
Has Abstractpub_date
2014-08-26 00:00:00pages
4686issn
2041-1723pii
ncomms5686journal_volume
5pub_type
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