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
中科院分区:
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
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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