A primate herpesvirus uses the integrator complex to generate viral microRNAs.

A primate herpesvirus uses the integrator complex to generate viral microRNAs.
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DOI:
10.1016/j.molcel.2011.07.025
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发表时间:
2011-09-16
期刊:
影响因子:
16
通讯作者:
Steitz JA
Steitz JA
中科院分区:
生物学1区
文献类型:
--
作者:
Cazalla D;Xie M;Steitz JA

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松鼠猴疱疹病毒(Herpesvirus saimiri,HVS)是一种γ-疱疹病毒,在潜伏感染的绒猴T细胞中表达Sm类U RNA(HSURs)。通过深度测序,我们鉴定了六种HVS microRNA(miRNAs),它们来自三种发夹结构,位于三种HSUR的3′端加工信号的下游。病毒miRNAs与Ago蛋白结合,具有生物活性。我们通过鉴定嵌合HSUR-pre-miR转录物证实了两类病毒非编码RNA的表达是相关的。我们发现,HVS miRNA的生物发生依赖于Sm类RNA合成和加工所需的顺式作用元件。体内蛋白质组分的敲低和体外加工测定证明,HVS不利用产生大多数宿主miRNA的微处理器复合物。相反,整合子复合物切割产生HSUR的3′端和前体miRNA发夹。然后需要Exportin-5和Dicer来产生成熟的病毒miRNA。
Herpesvirus saimiri (HVS) is a γ-herpesvirus that expresses Sm-class U RNAs (HSURs) in latently-infected marmoset T cells. By deep sequencing, we identified six HVS microRNAs (miRNAs) that are derived from three hairpin structures located immediately downstream of the 3′-end processing signals of three of the HSURs. The viral miRNAs associate with Ago proteins and are biologically active. We confirmed that the expression of the two classes of viral non-coding RNAs is linked by identifying chimeric HSUR-pre-miR transcripts. We show that HVS miRNA biogenesis relies on cis-acting elements specifically required for synthesis and processing of Sm-class RNAs. Knockdown of protein components in vivo and processing assays in vitro demonstrated that HVS does not utilize the Microprocessor complex that generates most host miRNAs. Instead, the Integrator complex cleaves to generate the 3′ end of the HSUR and the pre-miRNA hairpin. Exportin-5 and Dicer are then required to generate mature viral miRNAs.
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