Tobacco vein banding mosaic virus 6K2 Protein Hijacks NbPsbO1 for Virus Replication.

Tobacco vein banding mosaic virus 6K2 Protein Hijacks NbPsbO1 for Virus Replication.
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烟草脉带花叶病毒 6K2 蛋白劫持 NbPsbO1 进行病毒复制

DOI:
10.1038/srep43455
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发表时间:
2017-02-23
期刊:
影响因子:
4.6
通讯作者:
Li XD
Li XD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Geng C;Yan ZY;Cheng DJ;Liu J;Tian YP;Zhu CX;Wang HY;Li XD

文献摘要

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叶绿体结合的囊泡是马铃薯病毒属病毒复制复合物(VRC)的关键组成部分。马铃薯病毒VRC由第二个6kDa蛋白(6K2)诱导,并且至少含有病毒RNA和核包涵蛋白b。迄今为止,尚未发现叶绿体蛋白与 6K2 相互作用并参与马铃薯Y病毒复制。在本文中,我们证明本氏烟草的光系统 II 析氧复合蛋白 (NbPsbO1) 是一种与烟草脉带花叶病毒 (TVBMV;马铃薯病毒属) 6K2 相互作用的叶绿体蛋白,存在于 VRC 中。第一个 6 kDa 蛋白 (6K1) 被 6K2 招募到 VRC,但与 NbPSbO1 没有相互作用。通过病毒诱导的基因沉默,在本塞姆塞姆氏烟草植物中敲低 NbPsbO1 基因表达,显着降低了 TVBMV 和另一种马铃薯病毒马铃薯病毒 Y 的积累水平,但不降低马铃薯病毒属马铃薯病毒 X 的积累水平。 6K2 中的氨基酸取代破坏了其与 NbPsbO1 的相互作用,也影响了 TVBMV 的复制。 NbPsbP1 和 NbPsbQ1 是光系统 II 析氧复合体的另外两个成分,与 6K2 没有相互作用,并且对 TVBMV 复制没有影响。总之,6K2 将 6K1 招募到 VRC 并劫持叶绿体蛋白 NbPsbO1 来调节马铃薯Y病毒复制。
Chloroplast-bound vesicles are key components in viral replication complexes (VRCs) of potyviruses. The potyviral VRCs are induced by the second 6 kDa protein (6K2) and contain at least viral RNA and nuclear inclusion protein b. To date, no chloroplast protein has been identified to interact with 6K2 and involve in potyvirus replication. In this paper, we showed that the Photosystem II oxygen evolution complex protein of Nicotiana benthamiana (NbPsbO1) was a chloroplast protein interacting with 6K2 of Tobacco vein banding mosaic virus (TVBMV; genus Potyvirus) and present in the VRCs. The first 6 kDa protein (6K1) was recruited to VRCs by 6K2 but had no interaction with NbPSbO1. Knockdown of NbPsbO1 gene expression in N. benthamiana plants through virus-induced gene silencing significantly decreased the accumulation levels of TVBMV and another potyvirus Potato virus Y, but not Potato virus X of genus Potexvirus. Amino acid substitutions in 6K2 that disrupted its interaction with NbPsbO1 also affected the replication of TVBMV. NbPsbP1 and NbPsbQ1, two other components of the Photosystem II oxygen evolution complex had no interaction with 6K2 and no effect on TVBMV replication. To conclude, 6K2 recruits 6K1 to VRCs and hijacks chloroplast protein NbPsbO1 to regulate potyvirus replication.