The nonstructural protein NSs encoded by tomato zonate spot virus suppresses RNA silencing by interacting with NbSGS3
文献类型： 外文期刊
作者： Chen, Jianbin 1 ; Zheng, Limin 1 ; Shi, Xiaobin 1 ; Zhang, Songbai 1 ; Tan, Xinqiu 1 ; Zhao, Xingyue 2 ; Lu, Bingxin 2 ; Ye, Qian 2 ; Miao, Shuyue 2 ; Liu, Yong 1 ; Zhang, Deyong 1 ;
作者机构： 1.Hunan Univ, Longping Branch, Grad Sch, Changsha, Peoples R China
2.Hunan Acad Agr Sci, Hunan Plant Protect Inst, Changsha, Peoples R China
关键词： nonstructural protein NSs; RNA silencing; Suppressor of gene silencing 3; tomato zonate spot virus (TZSV); VSRs
期刊名称：MOLECULAR PLANT PATHOLOGY （ 影响因子：5.52； 五年影响因子：6.25 ）
ISSN： 1464-6722
年卷期： 2022 年 23 卷 5 期
页码：
收录情况： SCI
摘要： Viral suppressors of RNA silencing (VSRs) are encoded by diverse viruses to counteract the RNA silencing-mediated defence mounted by the virus-infected host cells. In this study, we identified the NSs protein encoded by tomato zonate spot virus (TZSV) as a potent VSR, and used a potato virus X (PVX)-based heterologous expression system to demonstrate TZSV NSs as a viral pathogenicity factor that intensified PVX symptoms in Nicotiana benthamiana. We then used a yeast two-hybrid screen to identify the suppressor of gene silencing 3 protein of N. benthamiana (NbSGS3), a known component of the plant RNA silencing pathway, as an interaction partner of TZSV NSs. We verified this interaction in plant cells with bimolecular fluorescence complementation, subcellular colocalization, and co-immunoprecipitation. We further revealed that the NSs-NbSGS3 interaction correlated with the VSR activity of TZSV NSs. TZSV NSs reduced the concentration of NbSGS3 protein in plant cells, probably through the ubiquitination and autophagy pathways. Interestingly, TZSV infection, but not NSs overexpression, significantly up-regulated the NbSGS3 transcript levels. Our data indicate that TZSV NSs suppresses RNA silencing of the host plant and enhances TZSV pathogenicity through its interaction with NbSGS3. This study reveals a novel molecular mechanism of NSs-mediated suppression of plant host antiviral defence.
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