Toward a structural understanding of IRES RNA function.

Toward a structural understanding of IRES RNA function.
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DOI:
10.1016/j.sbi.2009.03.005
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发表时间:
2009-06
影响因子:
6.8
通讯作者:
Kieft, Jeffrey S.
Kieft, Jeffrey S.
中科院分区:
生物学2区
文献类型:
--
作者:
Filbin, Megan E.;Kieft, Jeffrey S.

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RNA模板的蛋白质合成可以通过两种不同的已知机制来启动:帽依赖的翻译起始和帽非依赖性的翻译起始。后者是由称为内部核糖体进入位点(IRESS)的RNA序列驱动的,这种RNA序列在病毒RNA和细胞mRNAs中都存在。IRESS使用的不同机制反映在它们的结构多样性上,这种结构多样性向我们提出了一个将IRES职能与结构联系起来的连贯模式。随着病毒IRESS获得更直接的结构信息,数据表明IRES RNA自身形成稳定结构的程度与其发挥功能所需的因子数量之间存在负相关。从病毒IRESS中吸取的经验教训可能有助于理解细胞IRESS,尽管在建立任何强有力的联系之前需要更多的结构数据。
Protein synthesis of an RNA template can initiate by two different known mechanisms: cap-dependent translation initiation and cap-independent translation initiation. The latter is driven by RNA sequences called internal ribosome entry sites (IRESs) that are found in both viral RNAs and cellular mRNAs. The diverse mechanisms used by IRESs are reflected in their structural diversity, and this structural diversity challenges us to develop a cohesive model linking IRES function to structure. With more direct structural information available for the viral IRESs, data suggest an inverse correlation between the degree to which an IRES RNA can form a stable structure on its own, and the number of factors that it requires to function. Lessons learned from the viral IRESs may help understand the cellular IRESs, although more structural data is needed before any strong links can be made.
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