RNA Origami: Packaging a Segmented Genome in Orbivirus Assembly and Replication.

RNA Origami: Packaging a Segmented Genome in Orbivirus Assembly and Replication.
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DOI:
10.3390/v13091841
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发表时间:
2021-09-15
期刊:
Viruses
影响因子:
--
通讯作者:
Roy P
Roy P
中科院分区:
其他
文献类型:
--
作者:
Sung PY;Roy P

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了解具有多片段基因组的病毒如何将每个片段的一个拷贝合并到它们的衣壳中仍然是一个有趣的问题。在这里,我们回顾了我们的最新进展,并描述了在理解具有10个片段(S1-S10)双链RNA(DsRNA)基因组的模式无包膜病毒蓝舌病毒(BTV)基因组包装机制方面的进展。呼肠孤病毒科轮状病毒属BTV(多种血清型)是家畜的重要病原,在世界范围内造成重大经济损失。这使得一系列广泛的试剂和分析方法得以创建,包括反向遗传学、无细胞RNA包装和定制的生物信息学方法,这些方法可以直接解决包装问题。我们的研究表明:(I)UTRs使下一水平的RNA-RNA相互作用所需的每个片段能够构象;(Ii)片段间相互作用的特定顺序导致一个复杂的RNA网络,该网络包含了分选和包装中的所有活性成分;(Iii)网络片段被招募到新生的组装衣壳中;以及(Iv)特定的衣壳蛋白可能参与了包装过程。BTV和相关dsRNA病毒基因组包装机制的关键特征是新颖的,并开辟了潜在干预的新途径。
Understanding how viruses with multi-segmented genomes incorporate one copy of each segment into their capsids remains an intriguing question. Here, we review our recent progress and describe the advancements made in understanding the genome packaging mechanism of a model nonenveloped virus, Bluetongue virus (BTV), with a 10-segment (S1–S10) double-strand RNA (dsRNA) genome. BTV (multiple serotypes), a member of the Orbivirus genus in the Reoviridae family, is a notable pathogen for livestock and is responsible for significant economic losses worldwide. This has enabled the creation of an extensive set of reagents and assays, including reverse genetics, cell-free RNA packaging, and bespoke bioinformatics approaches, which can be directed to address the packaging question. Our studies have shown that (i) UTRs enable the conformation of each segment necessary for the next level of RNA–RNA interaction; (ii) a specific order of intersegment interactions leads to a complex RNA network containing all the active components in sorting and packaging; (iii) networked segments are recruited into nascent assembling capsids; and (iv) select capsid proteins might be involved in the packaging process. The key features of genome packaging mechanisms for BTV and related dsRNA viruses are novel and open up new avenues of potential intervention.
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