Severe acute respiratory syndrome coronavirus accessory protein 9b is a virion-associated protein.

Severe acute respiratory syndrome coronavirus accessory protein 9b is a virion-associated protein.
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严重急性呼吸综合征冠状病毒辅助蛋白 9b 是一种病毒体相关蛋白

DOI:
10.1016/j.virol.2009.03.032
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发表时间:
2009-06-05
期刊:
影响因子:
3.7
通讯作者:
Sun B
Sun B
中科院分区:
医学3区
文献类型:
--
作者:
Xu K;Zheng BJ;Zeng R;Lu W;Lin YP;Xue L;Li L;Yang LL;Xu C;Dai J;Wang F;Li Q;Dong QX;Yang RF;Wu JR;Sun B

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在严重急性呼吸综合征相关冠状病毒(SARS-CoV)中已鉴定出八种辅助蛋白。据信它们在病毒生命周期中发挥作用,并可能有助于发病机制和毒力。 ORF9b 作为这些辅助蛋白之一,位于亚基因组 mRNA9 中,编码 98 个氨基酸的蛋白。然而,9b蛋白是否是SARS-CoV颗粒的结构成分仍不清楚。在这项研究中,我们证明 9b 蛋白是通过渗漏核糖体扫描从双顺反子 mRNA9 翻译而来,并整合到病毒样颗粒 (VLP) 和纯化的 SARS-CoV 病毒颗粒中。进一步分析表明,9b 蛋白是否充分掺入 VLP 取决于 E 和 M 蛋白的共表达,而不取决于 S 或 N 蛋白的存在。我们的数据表明 SARS-CoV 的 9b 蛋白是另一种病毒体相关的辅助蛋白。这一发现将有助于更好地了解 SARS-CoV 9b 蛋白的特性。
Eight accessory proteins have been identified in severe acute respiratory syndrome-associated coronavirus (SARS-CoV). They are believed to play roles in the viral life cycle and may contribute to the pathogenesis and virulence. ORF9b as one of these accessory proteins is located in subgenomic mRNA9 and encodes a 98 amino acid protein. However, whether 9b protein is a structural component of SARS-CoV particles remains unknown. In this study, we demonstrate that 9b protein is translated from bicistronic mRNA9 via leaky ribosome scanning and it is incorporated into both virus-like particles (VLPs) and purified SARS-CoV virions. Further analysis shows that sufficient incorporation of 9b protein into VLPs is dependent upon the co-expression of E and M proteins, but not upon the presence of either S or N protein. Our data indicate that 9b protein of SARS-CoV is another virion-associated accessory protein. This finding will lead to a better understanding of the properties of the SARS-CoV 9b protein.
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