Structures required for poly(A) tail-independent translation overlap with, but are distinct from, cap-independent translation and RNA replication signals at the 3' end of Tobacco necrosis virus RNA.

Structures required for poly(A) tail-independent translation overlap with, but are distinct from, cap-independent translation and RNA replication signals at the 3' end of Tobacco necrosis virus RNA.
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Poly(A) 尾独立翻译所需的结构与烟草坏死病毒 RNA 3 端的帽子独立翻译和 RNA 复制信号重叠但不同。

DOI:
10.1016/j.virol.2006.08.054
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发表时间:
2007
期刊:
影响因子:
3.7
通讯作者:
Miller,WAllen
Miller,WAllen
中科院分区:
医学3区
文献类型:
--
作者:
Shen,Ruizhong;Miller,WAllen

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烟草坏死坏死病毒 (TNV) RNA 缺乏 5' 帽和聚腺苷酸尾,但翻译效率较高,部分原因在于其 3' 非翻译区 (UTR) 中存在类似大麦黄矮病毒 (BYDV) 的帽独立翻译元件 (BTE)。在这里,我们通过使用编码两侧为病毒 UTR 的荧光素酶报告基因的 RNA 来鉴定 BTE 下游的序列,该序列是体内多聚腺苷酸尾独立翻译所必需的。缺失和点突变导致翻译丢失,但通过添加 Poly(A) 尾而不是添加 5' 帽可以恢复翻译丢失。病毒基因组中的两个 3'-近端茎环有助于多聚腺苷酸尾独立翻译以及 RNA 复制。对于所有坏死病毒,我们预测保守的 3'UTR 二级结构,包括长螺旋轴一端的 BTE 和另一端的 Poly(A) 尾独立翻译和 RNA 复制所需的茎环。这项工作表明,病毒基因组可以在 3' UTR 中包含不同的帽和聚 (A) 尾模拟序列。
Tobacco necrosis necrovirus (TNV) RNA lacks both a 5′ cap and a poly(A) tail but is translated efficiently, owing in part to a Barley yellow dwarf virus (BYDV)-like cap-independent translation element (BTE) in its 3′ untranslated region (UTR). Here, we identify sequence downstream of the BTE that is necessary for poly(A) tail-independent translation in vivo by using RNA encoding a luciferase reporter gene flanked by viral UTRs. Deletions and point mutations caused loss of translation that was restored by adding a poly(A) tail, and not by adding a 5′ cap. The two 3′-proximal stem–loops in the viral genome contribute to poly(A) tail-independent translation, as well as RNA replication. For all necroviruses, we predict a conserved 3′ UTR secondary structure that includes the BTE at one end of a long helical axis and the stem–loops required for poly(A) tail-independent translation and RNA replication at the other end. This work shows that a viral genome can harbor distinct cap- and poly(A) tail-mimic sequences in the 3′ UTR.
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发表时间: 1996
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