The P2 capsid protein of the nonenveloped rice dwarf phytoreovirus induces membrane fusion in insect host cells

The P2 capsid protein of the nonenveloped rice dwarf phytoreovirus induces membrane fusion in insect host cells
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无包膜水稻矮化植物呼肠孤病毒的 P2 衣壳蛋白诱导昆虫宿主细胞膜融合

DOI:
10.1073/pnas.0708946104
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发表时间:
2007-12
期刊:
Proceedings of the National Academy of Sciences of the United States of America (PNAS)
影响因子:
--
通讯作者:
Wei Chunhong
Wei Chunhong
中科院分区:
其他
文献类型:
--
作者:
Deng Wulan;Ding Biao;Wei Taiyun;Li Yi;Liu Huijun;Pu YingYing;Zhou Feng;Toshihiro Omura;Wei Chunhong

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昆虫传播是许多动植物病毒感染的重要过程。昆虫传播的植物病毒是如何进入昆虫细胞启动感染周期的,人们对此知之甚少,特别是对无包膜的植物和动物病毒。水稻矮缩病毒(RDV)衣壳蛋白P2是昆虫传播所必需的非囊膜蛋白。在这里,我们提出的证据表明,P2与被膜动物病毒编码的膜融合蛋白具有相同的结构特征。当RDV P2异位表达并展示在昆虫果蝇细胞表面时,在低pH条件下诱导以合胞体形成为特征的膜融合。突变分析表明,N末端和一个七肽重复序列是膜融合诱导活性的关键。这些结果与RDV感染的昆虫介体叶蝉细胞的结果是一致的。我们认为RDV P2诱导的膜融合在病毒进入昆虫细胞过程中起着关键作用。我们的报告表明,植物病毒蛋白可以诱导膜融合,这对于研究病毒进入昆虫细胞和昆虫传播无包膜动植物病毒的机制具有广泛的意义。
Insect transmission is an essential process of infection for numerous plant and animal viruses. How an insect-transmissible plant virus enters an insect cell to initiate the infection cycle is poorly understood, especially for nonenveloped plant and animal viruses. The capsid protein P2 of rice dwarf virus (RDV), which is nonenveloped, is necessary for insect transmission. Here, we present evidence that P2 shares structural features with membrane-fusogenic proteins encoded by enveloped animal viruses. When RDV P2 was ectopically expressed and displayed on the surface of insect Spodoptera frugiperda cells, it induced membrane fusion characterized by syncytium formation at low pH. Mutational analyses identified the N-terminal and a heptad repeat as being critical for the membrane fusion-inducing activity. These results are corroborated with results from RDV-infected cells of the insect vector leafhopper. We propose that the RDV P2-induced membrane fusion plays a critical role in viral entry into insect cells. Our report that a plant viral protein can induce membrane fusion has broad significance in studying the mechanisms of virus entry into insect cells and insect transmission of nonenveloped plant and animal viruses.
DOI: 10.1073/pnas.0708217104
发表时间: 2007-11
期刊: Proceedings of the National Academy of Sciences
影响因子: --
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通讯作者: Shengqiang Yu;K. Hackmann;Jiangang Gao;Xiaobing He;K. Piontek;M. García-González;L. Menezes;Hangxue Xu;G. Germino;J. Zuo;F. Qian
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发表时间: 1999-10-01
期刊: CELL
影响因子: 64.5
作者:
Eckert, DM;Malashkevich, VN;Kim, PS
通讯作者: Kim, PS
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发表时间: 2003-11
影响因子: 2.7
作者:
B. Zhong;A. Kikuchi;Y. Moriyasu;T. Higashi;K. Hagiwara;T. Omura
通讯作者: B. Zhong;A. Kikuchi;Y. Moriyasu;T. Higashi;K. Hagiwara;T. Omura
DOI: --
发表时间: 1993
期刊: --
影响因子: --
作者:
S. Nir;M. C. Lima;C. Larsen;J. Wilschut;D. Hoekstra;N. Duzguneş
通讯作者: S. Nir;M. C. Lima;C. Larsen;J. Wilschut;D. Hoekstra;N. Duzguneş
DOI: 10.1016/s0005-2736(03)00170-6
发表时间: 2003-07
期刊: Biochimica et biophysica acta
影响因子: --
作者:
S. Peisajovich;Y. Shai
通讯作者: S. Peisajovich;Y. Shai