Viral crosslinking and solid-phase purification enables discovery of ribonucleoprotein complexes on incoming RNA virus genomes.

Viral crosslinking and solid-phase purification enables discovery of ribonucleoprotein complexes on incoming RNA virus genomes.
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病毒交联和固相纯化使人们能够在传入的RNA病毒基因组上发现核糖核蛋白复合体。

DOI:
10.1038/s41596-020-00429-6
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发表时间:
2021-01
期刊:
影响因子:
14.8
通讯作者:
Ascano M
Ascano M
中科院分区:
生物学1区
文献类型:
--
作者:
Kim B;Arcos S;Rothamel K;Ascano M

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进入的、复制前的病毒体RNA和宿主蛋白因子之间的初始相互作用在感染和免疫中是重要的。然而目前还没有方法来研究这些关键事件。我们建立了VIR-CLASP(VIRal Cross-Linking And Solid-phase Purification)来鉴定主要的病毒RNA-宿主蛋白相互作用。首先,用4-硫代尿苷(4SU)标记的RNA病毒感染宿主细胞,并用365 nm光照射以交联4SU标记的病毒基因组和来自宿主或病毒的相互作用蛋白。利用蛋白质变性缓冲液,通过固相可逆固定化(SPRI)珠纯化交联的RNA结合蛋白(RBP),然后进行蛋白质组学鉴定。使用VIR-CLASP,只有进入的病毒体RNA被4SU标记,因此交联事件特异性地发生在蛋白质和预复制的病毒体RNA之间。由于在蛋白质变性条件下的固相纯化,而不是序列特异性核酸纯化,用于下拉总RNA和交联的RBP,因此该方法有助于研究潜在的所有RNA病毒,而不管RNA序列如何。4SU标记病毒的制备需要约7天,VIR-CLASP需要1天。
The initial interactions between incoming, pre-replicated virion RNA and host protein factors are important in infection and immunity. Yet currently there are no methods to study these crucial events. We established VIR-CLASP (VIRal Cross-Linking And Solid-phase Purification) to identify the primary viral RNA-host protein interactions. First, host cells are infected with 4-thiouridine (4SU)-labeled RNA viruses and irradiated with 365 nm light to crosslink 4SU-labeled viral genomes and interacting proteins from host or virus. The cross-linked RNA binding proteins (RBPs) are purified by solid-phase reversible immobilization (SPRI) beads with protein denaturing buffers, and then identified by proteomics. With VIR-CLASP, only the incoming virion RNAs are labeled with 4SU, so cross-linking events specifically occur between proteins and pre-replicated virion RNA. Since solid-phase purification under protein-denaturing conditions, rather than sequence-specific nucleic acid purification, is used to pull-down total RNA and cross-linked RBPs, this method facilitates investigation of potentially all RNA viruses, regardless of RNA sequence. Preparation of 4SU-labeled virus takes ~7 days and VIR-CLASP takes 1 day.
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