In situ structures of the segmented genome and RNA polymerase complex inside a dsRNA virus.

In situ structures of the segmented genome and RNA polymerase complex inside a dsRNA virus.
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dsRNA 病毒内分段基因组和 RNA 聚合酶复合物的原位结构

DOI:
10.1038/nature15767
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发表时间:
2015-11-26
期刊:
影响因子:
64.8
通讯作者:
Zhou, Z. Hong
Zhou, Z. Hong
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhang, Xing;Ding, Ke;Yu, Xuekui;Chang, Winston;Sun, Jingchen;Zhou, Z. Hong

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呼肠孤病毒科的病毒,如三壳人类轮状病毒和单壳昆虫细胞质多角体病毒(CPV),都在病毒衣壳内包装了分段双链RNA(dsRNA)的基因组,并进行内源性信使RNA合成通过转录酶复合物(TEC)。通过直接电子计数冷冻电子显微镜和不对称重建,我们已经确定了组织的dsRNA基因组内的静止CPV(q-CPV)和原位原子结构的TEC内CPV在静止和转录(t-CPV)状态。我们发现CPV中的10个片段化dsRNA以特定的非对称方式与10个TEC组织在一起,每个dsRNA片段直接连接到TEC。TEC由两个广泛相互作用的亚基组成:RNA依赖性RNA聚合酶(RdRP)和NTR VP 4。我们发现,手镯结构域的RdRP发生显着的构象变化时,q-CPV转化为t-CPV,导致形成的RNA模板进入通道和访问的聚合酶活性位点。来自衣壳壳蛋白(CSP)的两个亚基中的每一个的氨基末端螺旋与VP 4和RdRP相互作用。
Viruses in the Reoviridae, like the triple-shelled human rotavirus and the single-shelled insect cytoplasmic polyhedrosis virus (CPV), all package a genome of segmented double-stranded RNAs (dsRNAs) inside the viral capsid and carry out endogenous messenger RNA synthesis through a transcriptional enzyme complex (TEC). By direct electron-counting cryoelectron microscopy and asymmetric reconstruction, we have determined the organization of the dsRNA genome inside quiescent CPV (q-CPV) and the in situ atomic structures of TEC within CPV in both quiescent and transcribing (t-CPV) states. We show that the ten segmented dsRNAs in CPV are organized with ten TECs in a specific, non-symmetric manner, with each dsRNA segment attached directly to a TEC. The TEC consists of two extensively interacting subunits: an RNA-dependent RNA polymerase (RdRP) and an NTPase VP4. We find that the bracelet domain of RdRP undergoes marked conformational change when q-CPV is converted to t-CPV, leading to formation of the RNA template entry channel and access to the polymerase active site. An amino-terminal helix from each of two subunits of the capsid shell protein (CSP) interacts with VP4 and RdRP.
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