Cryo-EM model of the bullet-shaped vesicular stomatitis virus.

Cryo-EM model of the bullet-shaped vesicular stomatitis virus.
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DOI:
10.1126/science.1181766
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发表时间:
2010-02-05
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Zhou ZH
Zhou ZH
中科院分区:
其他
文献类型:
--
作者:
Ge P;Tsao J;Schein S;Green TJ;Luo M;Zhou ZH

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水疱性口炎病毒(VSV)是一种子弹状横纹肌病毒,是一种负链RNA病毒的模型系统。基于低温电子显微镜的直接可视化,我们发现每个病毒粒子包含两个嵌套的左旋螺旋,一个是基质蛋白M的外螺旋,一个是核蛋白N和RNA的内螺旋。M有一个枢纽结构域,有四个接触位点连接到相邻的M和N亚基,通过夹紧核衣壳的相邻匝提供刚性。相邻N亚基之间的并排相互作用对于核衣壳形成子弹形状至关重要,基于结构的诱变结果支持这一描述。总之,我们的数据表明了一种VSV组装机制,在这种机制中,核衣壳从尖端螺旋变为螺旋状主干,随后被M层框架和固化。
Vesicular stomatitis virus (VSV) is a bullet-shaped rhabdovirus and a model system of negative-strand RNA viruses. Based on direct visualization by cryo-electron microscopy, we show that each virion contains two nested, left-handed helices, an outer helix of matrix protein M and an inner helix of nucleoprotein N and RNA. M has a hub domain with four contact sites that link to neighboring M and N subunits, providing rigidity by clamping adjacent turns of the nucleocapsid. Side-by-side interactions between neighboring N subunits are critical for the nucleocapsid to form a bullet shape, and structure-based mutagenesis results support this description. Together, our data suggest a mechanism of VSV assembly in which the nucleocapsid spirals from the tip to become the helical trunk, both subsequently framed and rigidified by the M layer.
DOI: 10.1016/s0042-6822(95)80016-6
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