The capsid-coding region hairpin element (cHP) is a critical determinant of dengue virus and West Nile virus RNA synthesis.

The capsid-coding region hairpin element (cHP) is a critical determinant of dengue virus and West Nile virus RNA synthesis.
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DOI:
10.1016/j.virol.2008.06.034
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发表时间:
2008-09-30
期刊:
影响因子:
3.7
通讯作者:
Harris, Eva
Harris, Eva
中科院分区:
医学3区
文献类型:
--
作者:
Clyde, Karen;Barrera, Julio;Harris, Eva

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登革病毒(DENV)和西尼罗河病毒(WNV)是正链RNA病毒黄病毒属的成员。RNA序列和结构,主要是在非翻译区,已被证明可调节黄病毒的基因表达和基因组复制。此前,我们证明了登革病毒编码区的一种结构(cHP)可增强翻译起始密码子的选择,并且是病毒复制所必需的。在此我们进一步描述cHP在登革病毒生命周期中的作用。我们证明cHP以一种不依赖序列的方式对有效的病毒RNA合成是必需的。cHP被破坏的病毒可通过一种自发的补偿性突变来挽救,该突变可使结构重新稳定。此外,预计在节肢动物传播的黄病毒中保守的cHP是西尼罗河病毒复制所必需的。我们提出cHP是黄病毒复制的一个多功能决定因素,在翻译和RNA合成中均起作用。
Dengue virus (DENV) and West Nile virus (WNV) are members of the Flavivirus genus of positive-strand RNA viruses. RNA sequences and structures, primarily in the untranslated regions, have been shown to modulate flaviviral gene expression and genome replication. Previously, we demonstrated that a structure in the DENV coding region (cHP) enhances translation start codon selection and is required for viral replication. Here we further characterize the role of the cHP in the DENV life cycle. We demonstrate that the cHP is required for efficient viral RNA synthesis in a sequence-independent manner. Viruses with a disrupted cHP are rescued by a spontaneous compensatory mutation that restabilizes the structure. Furthermore, the cHP, which is predicted to be conserved among arthropod-borne flaviviruses, is required for WNV replication. We propose that the cHP is a multifunctional determinant of flavivirus replication, functioning in both translation and RNA synthesis.
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