Composition of the sequence downstream of the dengue virus 5' cyclization sequence (dCS) affects viral RNA replication.

Composition of the sequence downstream of the dengue virus 5' cyclization sequence (dCS) affects viral RNA replication.
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DOI:
10.1016/j.virol.2011.10.025
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发表时间:
2012-01-20
期刊:
影响因子:
3.7
通讯作者:
Harris E
Harris E
中科院分区:
医学3区
文献类型:
--
作者:
Friebe P;Peña J;Pohl MO;Harris E

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登革病毒(DENV)的RNA复制需要病毒基因组的RNA - RNA介导的环化,这包括在基因组两端至少三组互补的RNA序列。5′和3′非翻译区形成了几个额外的RNA元件,它们参与翻译调控并且是RNA复制所必需的。基因组末端之间的相互作用导致RNA元件的结构重组,形成一个功能性的RNA锅柄状结构。在此我们报道,衣壳基因中5′环化序列(CS)元件下游的序列组成,被指定为下游CS(dCS)序列——而非衣壳蛋白——也通过调节5′端的拓扑结构影响病毒基因组环化以及因此复制的能力。这些结果为报告基因亚基因组和基因组蚊媒黄病毒构建体的设计提供了见解,并有助于对病毒RNA复制的理解。
RNA replication of dengue virus (DENV) requires an RNA-RNA mediated circularization of the viral genome, which includes at least three sets of complementary RNA sequences on both ends of the genome. The 5′ and the 3′ untranslated regions form several additional RNA elements that are involved in regulation of translation and required for RNA replication. Communication between the genomic termini results in a structural reorganization of the RNA elements, forming a functional RNA panhandle structure. Here we report that the sequence composition downstream of the 5′ CS element in the capsid gene, designated as downstream CS (dCS) sequence -- but not the capsid protein -- also influences the ability of the viral genome to circularize and hence replicate by modulating the topology of the 5′ end. These results provide insights for the design of reporter sub-genomic and genomic mosquito-borne flavivirus constructs and contribute to the understanding of viral RNA replication.
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