SARS-CoV-2 nucleocapsid protein forms condensates with viral genomic RNA.

SARS-CoV-2 nucleocapsid protein forms condensates with viral genomic RNA.
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DOI:
10.1371/journal.pbio.3001425
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发表时间:
2021-10
期刊:
影响因子:
9.8
通讯作者:
Yildiz A
Yildiz A
中科院分区:
生物学1区
文献类型:
--
作者:
Jack A;Ferro LS;Trnka MJ;Wehri E;Nadgir A;Nguyenla X;Fox D;Costa K;Stanley S;Schaletzky J;Yildiz A

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严重急性呼吸系统综合症冠状病毒 2 (SARS-CoV-2) 感染导致 2019 年冠状病毒病 (COVID-19),这是一种严重威胁全球健康的大流行病。 SARS-CoV-2 通过将其 RNA 基因组包装到宿主细胞的膜外壳中来传播。病毒基因组包装到新生病毒粒子中是由核衣壳(N)蛋白介导的,但潜在的机制仍不清楚。在这里,我们证明 N 蛋白在体外和哺乳动物细胞中与病毒基因组 RNA 形成生物分子缩合物。虽然 N 蛋白与同聚 RNA 底物形成球形组件,但不形成碱基配对相互作用,但它与病毒 RNA 链形成不对称缩合物。交联质谱 (CLMS) 发现了一个驱动冷凝物中 N 蛋白之间相互作用的区域,删除该区域会破坏相分离。我们还发现了可以改变 N 蛋白凝聚物的大小和形状并抑制受感染细胞中 SARS-CoV-2 增殖的小分子。这些结果表明,N 蛋白可能利用生物分子缩合将 SARS-CoV-2 RNA 基因组包装到病毒颗粒中。 SARS-CoV-2 基因组的包装是由核衣壳 (N) 蛋白介导的;这项研究表明,N 蛋白与病毒基因组 RNA 形成液体冷凝物,并鉴定出改变这些冷凝物的小分子。
The Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) infection causes Coronavirus Disease 2019 (COVID-19), a pandemic that seriously threatens global health. SARS-CoV-2 propagates by packaging its RNA genome into membrane enclosures in host cells. The packaging of the viral genome into the nascent virion is mediated by the nucleocapsid (N) protein, but the underlying mechanism remains unclear. Here, we show that the N protein forms biomolecular condensates with viral genomic RNA both in vitro and in mammalian cells. While the N protein forms spherical assemblies with homopolymeric RNA substrates that do not form base pairing interactions, it forms asymmetric condensates with viral RNA strands. Cross-linking mass spectrometry (CLMS) identified a region that drives interactions between N proteins in condensates, and deletion of this region disrupts phase separation. We also identified small molecules that alter the size and shape of N protein condensates and inhibit the proliferation of SARS-CoV-2 in infected cells. These results suggest that the N protein may utilize biomolecular condensation to package the SARS-CoV-2 RNA genome into a viral particle. The packaging of the SARS-CoV-2 genome is mediated by the nucleocapsid (N) protein; this study shows that the N protein forms liquid condensates with viral genomic RNA and identifies small molecules that alter these condensates.
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