Packaged and Free Satellite Tobacco Mosaic Virus (STMV) RNA Genomes Adopt Distinct Conformational States.

Packaged and Free Satellite Tobacco Mosaic Virus (STMV) RNA Genomes Adopt Distinct Conformational States.
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DOI:
10.1021/acs.biochem.6b01166
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发表时间:
2017-04-25
期刊:
影响因子:
2.9
通讯作者:
Weeks KM
Weeks KM
中科院分区:
生物学3区
文献类型:
--
作者:
Larman BC;Dethoff EA;Weeks KM

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病毒的RNA基因组在其复制周期中可能经历多个功能上重要的构象变化,这些变化目前知之甚少。我们使用了两种互补的溶液中RNA结构探测策略(SHAPE-MaP和RING-MaP)来检查真实病毒体内部和无衣壳状态下卫星烟草花叶病毒RNA基因组的结构。两种RNA状态都具有相似的三结构域结构,其中每个主要复制功能(翻译、衣壳编码和基因组合成)都属于不同的结构域。然而,有很大的构象之间的差异,在病毒体和captlant的自由状态,主要是在一个手臂的中央T结构域。这些数据支持一个模型,其中包装的衣壳结合的RNA被约束在本地的高能量构象的天然衣壳壳。病毒衣壳的去除然后允许RNA基因组松弛成更稳定的构象。这些数据支持一个模型,其中中央T结构域的RNA结构在衣壳组装和拆卸过程中发生变化,并可能在基因组包装中发挥作用。
The RNA genomes of viruses likely undergo multiple functionally important conformational changes during their replication cycles, changes that are poorly understood at present. We used two complementary in-solution RNA structure probing strategies (SHAPE-MaP and RING-MaP) to examine the structure of the RNA genome of satellite tobacco mosaic virus inside authentic virions and in a capsid-free state. Both RNA states feature similar three-domain architectures in which each major replicative function – translation, capsid coding, and genome synthesis – fall into distinct domains. There are, however, large conformational differences between the in-virion and capsid-free states, primarily in one arm of the central T domain. These data support a model in which the packaged capsid-bound RNA is constrained in a local high-energy conformation by the native capsid shell. The removal of the viral capsid then allows the RNA genome to relax into a more thermodynamically stable conformation. These data support a model in which the RNA architecture of the central T domain changes during capsid assembly and disassembly and may play a role in genome packaging.
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