The intracellular sites of early replication and budding of SARS-coronavirus.

The intracellular sites of early replication and budding of SARS-coronavirus.
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DOI:
10.1016/j.virol.2006.11.027
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发表时间:
2007-05-10
期刊:
影响因子:
3.7
通讯作者:
Kochs G
Kochs G
中科院分区:
医学3区
文献类型:
--
作者:
Stertz S;Reichelt M;Spiegel M;Kuri T;Martínez-Sobrido L;García-Sastre A;Weber F;Kochs G

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在这项研究中,我们分析了严重急性呼吸综合征冠状病毒(SARS-CoV)在感染早期的复制和出芽位点。我们检测到细胞质中含有病毒核衣壳蛋白、病毒RNA和非结构蛋白nsp3。使用电镜技术,我们发现这些假定的病毒复制位点与特征性膜管和双层膜囊泡相关,这些膜管和双层膜囊泡很可能源自内质网池。除了存在于复制位点之外,N 还在高尔基体区域积累并与病毒刺突蛋白共定位。免疫电镜显示,早在感染后 3 小时,ERGIC(ER-高尔基体中间室)和高尔基体区域的膜上就出现了出芽,这表明 SARS-CoV 的复制速度惊人地快。我们的数据表明 SARS-CoV 在 ER 衍生膜上建立复制复合物。随后,病毒核衣壳必须被运输到高尔基体区域的出芽位点,在那里病毒糖蛋白积累并形成颗粒。
In this study, we analyzed the replication and budding sites of severe acute respiratory syndrome coronavirus (SARS-CoV) at early time points of infection. We detected cytoplasmic accumulations containing the viral nucleocapsid protein, viral RNA and the non-structural protein nsp3. Using EM techniques, we found that these putative viral replication sites were associated with characteristic membrane tubules and double membrane vesicles that most probably originated from ER cisternae. In addition to its presence at the replication sites, N also accumulated in the Golgi region and colocalized with the viral spike protein. Immuno-EM revealed that budding occurred at membranes of the ERGIC (ER–Golgi intermediate compartment) and the Golgi region as early as 3 h post infection, demonstrating that SARS-CoV replicates surprisingly fast. Our data suggest that SARS-CoV establishes replication complexes at ER-derived membranes. Later on, viral nucleocapsids have to be transported to the budding sites in the Golgi region where the viral glycoproteins accumulate and particle formation occurs.
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影响因子: 3.3
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