The nonstructural protein NSs encoded by tomato zonate spot virus suppresses RNA silencing by interacting with NbSGS3.

The nonstructural protein NSs encoded by tomato zonate spot virus suppresses RNA silencing by interacting with NbSGS3.
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番茄带斑病毒编码的非结构蛋白 NSs 通过与 NbSGS3 相互作用抑制 RNA 沉默

DOI:
10.1111/mpp.13192
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发表时间:
2022-05
影响因子:
4.9
通讯作者:
Zhang D
Zhang D
中科院分区:
农林科学1区
文献类型:
--
作者:
Chen J;Zheng L;Shi X;Zhang S;Tan X;Zhao X;Lu B;Ye Q;Miao S;Liu Y;Zhang D

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RNA沉默的病毒抑制因子(VSRs)由多种病毒编码,以抵消病毒感染宿主细胞的RNA沉默介导的防御。在这项研究中,我们鉴定了由番茄带状斑点病毒(TZSV)编码的NSs蛋白是一种有效的VSR,并利用基于马铃薯病毒X (PVX)的异源表达系统证明了TZSV NSs是一种病毒致病性因子,可以加剧本烟的PVX症状。然后,我们使用酵母双杂交筛选来鉴定N. benthamiana基因沉默3蛋白的抑制因子(NbSGS3),这是植物RNA沉默途径的已知组分,作为TZSV NSs的相互作用伙伴。我们在植物细胞中通过双分子荧光互补、亚细胞共定位和共免疫沉淀验证了这种相互作用。我们进一步发现NSs - nbsgs3相互作用与TZSV NSs的VSR活性相关。TZSV NSs可能通过泛素化和自噬途径降低了植物细胞中NbSGS3蛋白的浓度。有趣的是,TZSV感染,而非NSs过表达,显著上调了NbSGS3转录物水平。我们的数据表明,TZSV NSs通过与NbSGS3的相互作用抑制寄主植物的RNA沉默,增强TZSV的致病性。本研究揭示了NSs介导的植物宿主抗病毒防御抑制的一种新的分子机制。番茄带状斑点病毒(TZSV) NSs通过与NbSGS3相互作用抑制寄主植物的RNA沉默,增强TZSV的致病性。
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. Tomato zonate spot virus (TZSV) NSs suppresses RNA silencing of the host plant and enhances TZSV pathogenicity through its interaction with NbSGS3.
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