The intrinsically disordered SARS-CoV-2 nucleoprotein in dynamic complex with its viral partner nsp3a.

The intrinsically disordered SARS-CoV-2 nucleoprotein in dynamic complex with its viral partner nsp3a.
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DOI:
10.1126/sciadv.abm4034
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发表时间:
2022-01-21
期刊:
影响因子:
13.6
通讯作者:
Blackledge M
Blackledge M
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Bessa LM;Guseva S;Camacho-Zarco AR;Salvi N;Maurin D;Perez LM;Botova M;Malki A;Nanao M;Jensen MR;Ruigrok RWH;Blackledge M

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SARS-CoV-2的基因组复制和转录过程是抑制病毒的重要靶点。β冠状病毒核蛋白(N)是复制-转录复合体(RTC)的高度动态辅因子,其功能依赖于与nsp 3的氨基末端泛素样结构域(Ubl 1)的必要相互作用。在这里,我们以原子分辨率描述了这种复合物(解离常数- 30至200 nM)。这种相互作用暗示了内在无序的接头结构域(N3)中的两个线性基序,疏水螺旋(219 LALLLLDRLNQL 230)和无序极性链(243 GQTVTKKSAAEAS 255),它们相互接合以形成二分相互作用,将N3折叠在Ubl 1周围。这导致二聚体N的尺寸大幅崩溃,形成高度紧凑的分子伴侣,其调节与RNA的结合,表明nsp 3在N与RTC的关联中起关键作用。识别介导病毒基本因子之间重要相互作用的独特线性基序为开发抗COVID-19创新策略提供了未来目标。SARS-CoV-2核蛋白的内部结构紊乱,与其病毒伴侣nsp 3a形成动态的紧密复合物。
The processes of genome replication and transcription of SARS-CoV-2 represent important targets for viral inhibition. Betacoronaviral nucleoprotein (N) is a highly dynamic cofactor of the replication-transcription complex (RTC), whose function depends on an essential interaction with the amino-terminal ubiquitin-like domain of nsp3 (Ubl1). Here, we describe this complex (dissociation constant - 30 to 200 nM) at atomic resolution. The interaction implicates two linear motifs in the intrinsically disordered linker domain (N3), a hydrophobic helix (219LALLLLDRLNQL230) and a disordered polar strand (243GQTVTKKSAAEAS255), that mutually engage to form a bipartite interaction, folding N3 around Ubl1. This results in substantial collapse in the dimensions of dimeric N, forming a highly compact molecular chaperone, that regulates binding to RNA, suggesting a key role of nsp3 in the association of N to the RTC. The identification of distinct linear motifs that mediate an important interaction between essential viral factors provides future targets for development of innovative strategies against COVID-19. Intrinsically disordered SARS-CoV-2 nucleoprotein folds around its viral partner nsp3a to form a dynamic and compact complex.
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