Evolution of a helper virus-derived, ribosome binding translational enhancer in an untranslated satellite RNA of Turnip crinkle virus.

Evolution of a helper virus-derived, ribosome binding translational enhancer in an untranslated satellite RNA of Turnip crinkle virus.
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芜菁皱纹病毒非翻译卫星RNA中辅助病毒衍生的核糖体结合翻译增强子的进化。

DOI:
10.1016/j.virol.2011.07.019
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Simon,AnneE
Simon,AnneE
中科院分区:
医学3区
文献类型:
--
作者:
Guo,Rong;Meskauskas,Arturas;Dinman,JonathanD;Simon,AnneE

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SatC是一种与芜菁皱病毒(TCV)相关的非编码亚病毒RNA。TCV 3 ' UTR中一个100 nt的延伸包含三个发夹和两个假结,这些假结折叠成一个trna形结构(TSS),结合80S核糖体。satC的3 '一半来自TCV,在tss类似区域包含6-nt差异。SatC与80S核糖体结合较差,预测TSS三维结构的分子模型并没有预测出SatC的类似结构。当satC TSS区域逐步转化为TCV TSS原碱基时,核糖体结合增加到TCV TSS水平,但不显著影响satC复制。然而,突变体satC在植物中积累时不太适合,并引起许多第二位点的改变,从而削弱了两个satC构象中的一个。这些结果表明,satC中原始TCV序列的微小变化反映了核糖体结合消除以外的需求。
SatC is a noncoding subviral RNA associated with Turnip crinkle virus (TCV). A 100-nt stretch in the 3′ UTR of TCV contains three hairpins and two pseudoknots that fold into a tRNA-shaped structure (TSS) that binds 80S ribosomes. The 3′ half of satC is derived from TCV and contains 6-nt differences in the TSS-analogous region. SatC binds poorly to 80S ribosomes, and molecular modeling that predicted the 3D structure of the TSS did not predict a similar structure for satC. When the satC TSS region was step-wise converted to the original TCV TSS bases, ribosome binding increased to TCV TSS levels without significantly affecting satC replication. However, mutant satC was less fit when accumulating in plants and gave rise to numerous second site changes that weakened one of two satC conformations. These results suggest that minor changes from the original TCV sequence in satC reflect requirements other than elimination of ribosome binding.
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