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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Two RNA polymerase complexes from vesicular stomatitis virus-infected cells that carry out transcription and replication of genome RNA
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Two RNA polymerase complexes from vesicular stomatitis virus-infected cells that carry out transcription and replication of genome RNA

机译:来自水泡性口炎病毒感染细胞的两种RNA聚合酶复合物,可进行基因组RNA的转录和复制

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摘要

By immunoaffinity column chromatography, we have purified two RNA polymerase complexes, the transcriptase and replicase, from vesicular stomatitis virus-infected baby hamster kidney cells. The transcriptase is a multiprotein complex, containing the virus-encoded RNA polymerase L and P proteins, and two cellular proteins, translation elongation factor-la and heat-shock protein 60. In addition, the complex contains a submolar amount of cellular mRNA cap guanylyltransferase. The replicase, on the other hand, is a complex containing the viral proteins, L, P, and the nucleocapsid (N), but lacking elongation factor-1alpha, heat-shock protein 60, and guanylyltransferase. The transcriptase complex synthesizes capped mRNAs and initiates transcription at the first gene (N) start site, whereas the replicase complex initiates RNA synthesis at the precise 3' end of the genome RNA and synthesizes encapsidated replication products in the presence of the N-P complex. We propose that two RNA polymerase complexes that differ in their content of virally and host-encoded proteins are separately responsible for transcription and replication of vesicular stomatitis virus genome RNA.
机译:通过免疫亲和层析,我们从水泡性口炎病毒感染的小仓鼠肾细胞中纯化了两种RNA聚合酶复合物,即转录酶和复制酶。转录酶是一种多蛋白复合物,包含病毒编码的RNA聚合酶L和P蛋白,以及两种细胞蛋白,翻译延伸因子-1a和热休克蛋白60。此外,该复合物还包含亚摩尔量的细胞mRNA鸟嘌呤基转移酶。 。另一方面,复制酶是一种复合物,含有病毒蛋白L,P和核衣壳(N),但缺少延伸因子1α,热休克蛋白60和鸟苷酰转移酶。转录酶复合物合成加帽的mRNA,并在第一个基因(N)起始位点起始转录,而复制酶复合物在基因组RNA的精确3'端起始RNA合成,并在N-P复合物存在下合成衣壳化的复制产物。我们提出两个RNA聚合酶复合物,其病毒和宿主编码蛋白的含量不同,分别负责水疱性口炎病毒基因组RNA的转录和复制。

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