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首页> 外文期刊>Microbes and infection >Association of functional influenza viral proteins and RNAs with nuclear chromatin and sub-chromatin structure.
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Association of functional influenza viral proteins and RNAs with nuclear chromatin and sub-chromatin structure.

机译:功能性流感病毒蛋白和RNA与核染色质和亚染色质结构的关联。

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摘要

Transcription and replication of the influenza virus genome occur in the nucleus. However, the intra-nuclear localization of viral RNP complexes and the function of nuclear domains involved in viral transcription and replication, if any, are not well known. In the present study, we determined the intra-nuclear localization of viral proteins and viral RNAs and the in vitro RNA synthesis activity of viral RNP complexes associated with distinct nuclear fractions prepared from infected nuclei. A majority of viral RNA polymerases and M1 were recovered in DNase-sensitive fractions, whereas some portion of RNA polymerases and approximately 25% of NP were tightly associated with so-called nuclear matrix fractions. The amount of vRNA associated with the nuclear matrix was significantly more than that of cRNA. The in vitro viral RNA synthesis activity was detected in DNase-insensitive fractions, including the nuclear matrix. In contrast, newly synthesized viral RNAs were recovered in the DNase-sensitive fraction. These observations suggest that vRNP complexes are, at least partially, associated with densely packed chromatin, where viral transcription and replication occur, and the newly synthesized vRNP complexes to be transported into the cytoplasm are released into the nucleoplasm.
机译:流感病毒基因组的转录和复制发生在细胞核中。但是,病毒RNP复合物的核内定位以及参与病毒转录和复制的核域功能(如果有的话)尚不为人所知。在本研究中,我们确定了病毒蛋白和病毒RNA的核内定位以及与病毒RNP复合物的体外RNA合成活性,这些RNP复合物与从感染核中制备的不同核部分相关。大部分病毒RNA聚合酶和M1可从DNase敏感级分中回收,而某些RNA聚合酶和大约25%NP与所谓的核基质级分紧密相关。与核基质相关的vRNA的数量明显多于cRNA。在DNase不敏感级分,包括核基质中检测到体外病毒RNA合成活性。相反,在DNA酶敏感级分中回收了新合成的病毒RNA。这些观察结果表明,vRNP复合物至少部分与发生病毒转录和复制的致密染色质相关,并且新合成的要转运到细胞质中的vRNP复合物被释放到核质中。

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