Insights into the biology of IRES elements through riboproteomic approaches.

Insights into the biology of IRES elements through riboproteomic approaches.
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DOI:
10.1155/2010/458927
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发表时间:
2010
影响因子:
--
通讯作者:
Martinez-Salas E
Martinez-Salas E
中科院分区:
其他
文献类型:
--
作者:
Pacheco A;Martinez-Salas E

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翻译起始是一个高度调控的过程,对基因表达的转录后调控产生强烈的影响。两种替代机制控制真核生物mRNA的翻译起始,在大多数mRNA中起作用的帽依赖性起始机制,以及首次在小核糖核酸病毒中发现的内部核糖体进入位点(IRES)依赖性机制。IRES元件是高度结构化的RNA序列,在大多数情况下,需要特定的蛋白质来募集翻译机器。这些蛋白质中的一些是真核生物起始因子。此外,RNA结合蛋白(RBP)在内部起始控制中起关键作用。RBP是响应包括病毒感染在内的多种应激的基因表达的关键调节因子。本文综述了核糖蛋白质组学方法鉴定IRES反式作用因子(ITAFs)的最新进展以及RNA-蛋白质相互作用与IRES活性之间的关系,重点介绍了小核糖核酸病毒和丙型肝炎病毒IRES的最相关特征。
Translation initiation is a highly regulated process that exerts a strong influence on the posttranscriptional control of gene expression. Two alternative mechanisms govern translation initiation in eukaryotic mRNAs, the cap-dependent initiation mechanism operating in most mRNAs, and the internal ribosome entry site (IRES)-dependent mechanism, first discovered in picornaviruses. IRES elements are highly structured RNA sequences that, in most instances, require specific proteins for recruitment of the translation machinery. Some of these proteins are eukaryotic initiation factors. In addition, RNA-binding proteins (RBPs) play a key role in internal initiation control. RBPs are pivotal regulators of gene expression in response to numerous stresses, including virus infection. This review discusses recent advances on riboproteomic approaches to identify IRES transacting factors (ITAFs) and the relationship between RNA-protein interaction and IRES activity, highlighting the most relevant features on picornavirus and hepatitis C virus IRESs.
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