Unconventionally secreted effectors of two filamentous pathogens target plant salicylate biosynthesis
文献类型： 外文期刊
作者： Liu, Tingli 1 ; Song, Tianqiao 1 ; Zhang, Xiong 1 ; Yuan, Hongbo 2 ; Su, Liming 1 ; Li, Wanlin 1 ; Xu, Jing 1 ; Liu, Shih 1 ;
作者机构： 1.Nanjing Agr Univ, Dept Plant Pathol, Nanjing 210095, Jiangsu, Peoples R China
2.Jiangsu Acad Agr Sci, Prov Key Lab Agrobiol, Nanjing 210095, Jiangsu, Peoples R China
3.Jiangsu Acad Agr Sci, Prov Key Lab Agrobiol, Nanjing
期刊名称：NATURE COMMUNICATIONS （ 影响因子：14.919； 五年影响因子：15.805 ）
ISSN： 2041-1723
年卷期： 2014 年 5 卷
页码：
收录情况： SCI
摘要： 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.
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