Expression, purification, and characterization of SARS coronavirus RNA polymerase.

Expression, purification, and characterization of SARS coronavirus RNA polymerase.
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DOI:
10.1016/j.virol.2005.02.017
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发表时间:
2005-05-10
期刊:
影响因子:
3.7
通讯作者:
Ding J
Ding J
中科院分区:
医学3区
文献类型:
--
作者:
Cheng A;Zhang W;Xie Y;Jiang W;Arnold E;Sarafianos SG;Ding J

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严重急性呼吸综合征冠状病毒(SARS - CoV)的依赖RNA的RNA聚合酶(RdRp)对病毒复制至关重要,是抗SARS药物的一个潜在靶点。我们在此报道了N端谷胱甘肽S - 转移酶(GST)融合的SARS - CoV RdRp及其聚合酶催化结构域在大肠杆菌中的克隆、表达和纯化。在纯化过程中,发现全长的GST - RdRp被切割成三个主要片段:一个N端的p12片段、一个中间的p30片段和一个包含催化结构域的C端p64片段,推测是由于细菌蛋白酶的作用。生化分析表明,全长的GST - RdRp具有RdRp活性,p64和p12片段形成一个复合物,表现出相当的RdRp活性,而GST - p64蛋白没有活性,这表明p12结构域可能通过参与模板 - 引物结合对聚合酶活性是必需的。非核苷类HIV - 1逆转录酶抑制剂对SARS - CoV RdRp活性没有明显的抑制作用。这项工作为SARS - CoV RdRp的生化和结构研究以及抗SARS药物的开发提供了基础。
The RNA-dependent RNA polymerase (RdRp) of SARS coronavirus (SARS-CoV) is essential for viral replication and a potential target for anti-SARS drugs. We report here the cloning, expression, and purification of the N-terminal GST-fused SARS-CoV RdRp and its polymerase catalytic domain in Escherichia coli. During purification, the full-length GST-RdRp was found to cleave into three main fragments: an N-terminal p12 fragment, a middle p30 fragment, and a C-terminal p64 fragment comprising the catalytic domain, presumably due to bacterial proteases. Biochemical assays show that the full-length GST-RdRp has RdRp activity and the p64 and p12 fragments form a complex that exhibits comparable RdRp activity, whereas the GST-p64 protein has no activity, suggesting that the p12 domain is required for polymerase activity possibly via involvement in template-primer binding. Nonnucleoside HIV-1 RT inhibitors are shown to have no evident inhibitory effect on SARS-CoV RdRp activity. This work provides a basis for biochemical and structural studies of SARS-CoV RdRp and for development of anti-SARS drugs.
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