Mechanism of translation initiation by Dicistroviridae IGR IRESs.

Mechanism of translation initiation by Dicistroviridae IGR IRESs.
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DOI:
10.1016/j.virol.2011.01.005
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发表时间:
2011-03-15
期刊:
影响因子:
3.7
通讯作者:
Thompson SR
Thompson SR
中科院分区:
医学3区
文献类型:
--
作者:
Hertz MI;Thompson SR

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双顺反子病毒科(Dicistroviridae)是一个以双顺反子基因组为特征的生长型病毒家族,其中每个开放阅读框(ORF)从独立的内部核糖体进入位点(IRES)翻译。翻译第一个开放阅读框(ORF 1)的5′ IRES与小核糖核酸病毒IRES相似。然而,第二个IRES,被称为基因间区(IGR)IRES,翻译ORF 2,并使用一种不寻常的启动蛋白质合成的机制。它折叠成一个紧凑的RNA结构,可以直接与40 S核糖体亚基结合,形成80 S复合物,在没有任何起始因子的情况下启动翻译。尽管其不寻常的机制,IGR IRES已被证明是一个优雅的模型,阐明IRES所采用的启动机制,以及使其成为一个强大的研究工具,具有不同的应用。
The Dicistroviridae is a growing virus family characterized by a dicistronic genome, wherein each open reading frame (ORF) is translated from an independent internal ribosome entry site (IRES). The 5′ IRES that translates the first open reading frame (ORF1) is similar to the picornaviral IRESs. However the second IRES, referred to as the intergenic region (IGR) IRES, - translates ORF2 by and uses an unusual mechanism of initiating protein synthesis. It folds into a compact RNA structure that can bind directly to 40S ribosomal subunits and form 80S complexes to initiate translation in the absence of any initiation factors. Despite its unusual mechanism, the IGR IRES has proven to be an elegant model for elucidating initiation mechanisms employed by IRESs, as well as making it a powerful research tool with diverse applications.
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