p15 encoded by Garlic virus X is a pathogenicity factor and RNA silencing suppressor.

p15 encoded by Garlic virus X is a pathogenicity factor and RNA silencing suppressor.
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大蒜病毒X编码的p15是致病因子和RNA沉默抑制子。

DOI:
10.1099/jgv.0.001144
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发表时间:
2018-09
影响因子:
3.8
通讯作者:
Yan Fei
Yan Fei
中科院分区:
医学3区
文献类型:
--
作者:
Zhang Tianhao;Zhao Xing;Jiang Liangliang;Yang Xue;Chen Ying;Song Xijiao;Lu Yuwen;Peng Jiejun;Zheng Hongying;Wu Yuanhua;MacFarlane Stuart;Chen Jianping;Yan Fei

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大蒜病毒X(GarVX)编码一种15 kDa的富含半胱氨酸的蛋白(CRP)。为了研究p15的功能,分析了其亚细胞定位、作为症状决定因子的作用以及作为RNA沉默(VSR)的病毒抑制因子的能力。结果表明,GFP标记的p15蛋白分布于细胞质、细胞核和核仁中。从PVX的p15的表达引起额外的系统性叶畸形,并导致PVX的积累增加,表明p15是重建PVX-p15的毒力因子。此外,使用瞬时农杆菌浸润斑贴试验和芜菁皱缩病毒(TCV)运动互补试验,证明了p15具有弱的RNA沉默抑制活性。去除类似于核定位信号(NLS)的氨基酸基序阻止了p15在细胞核中的积累,但没有消除其沉默抑制活性。这项研究首次揭示了GarVX p15蛋白的多种功能。
Garlic virus X(GarVX) encodes a 15 kDa cysteine-rich protein (CRP). To investigate the function(s) of p15, its subcellular localization, role as a symptom determinant and capacity to act as a viral suppressor of RNA silencing (VSR) were analysed. Results showed that GFP-tagged p15 was distributed in the cytoplasm, nucleus and nucleolus. Expression of p15 from PVX caused additional systemic foliar malformation and led to increased accumulation of PVX, showing that p15 is a virulence factor for reconstructed PVX-p15. Moreover, using a transient agro-infiltration patch assay and a Turnip crinkle virus (TCV) movement complementation assay, it was demonstrated that p15 possesses weak RNA silencing suppressor activity. Removal of an amino acid motif resembling a nuclear localization signal (NLS) prevented p15 from accumulating in the nucleus but did not abolish its silencing suppression activity. This study provides the first insights into the multiple functions of the GarVX p15 protein.
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