9UJ2 image
Deposition Date 2025-04-16
Release Date 2025-05-21
Last Version Date 2025-05-21
Entry Detail
PDB ID:
9UJ2
Title:
14-3-3 zeta chimera with the S202R peptide of SARS-CoV-2 N (residues 200-213)
Biological Source:
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:14-3-3 protein zeta/delta,Peptide from Nucleoprotein
Gene (Uniprot):N, YWHAZ
Mutations:S202R,S58A,E73A,K74A,K75A,K157A,K158A,E159A
Chain IDs:B (auth: A)
Chain Length:249
Number of Molecules:1
Biological Source:Homo sapiens, Severe acute respiratory syndrome coronavirus 2
Polymer Type:polypeptide(L)
Molecule:14-3-3 protein zeta/delta,Peptide from Nucleoprotein
Gene (Uniprot):N, YWHAZ
Mutations:S202R,S58A,E73A,K74A,K75A,K157A,K158A,E159A
Chain IDs:A (auth: B)
Chain Length:249
Number of Molecules:1
Biological Source:Homo sapiens, Severe acute respiratory syndrome coronavirus 2
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
CME B CYS modified residue
OCY A CYS modified residue
TPO A THR modified residue
Primary Citation
High-resolution structure reveals enhanced 14-3-3 binding by a mutant SARS-CoV-2 nucleoprotein variant with improved replicative fitness.
Biochem.Biophys.Res.Commun. 767 151915 151915 (2025)
PMID: 40318379 DOI: 10.1016/j.bbrc.2025.151915

Abstact

Replication of many viruses depends on phosphorylation of viral proteins by host protein kinases and subsequent recruitment of host protein partners. The nucleoprotein (N) of SARS-CoV-2 is heavily phosphorylated and recruits human phosphopeptide-binding 14-3-3 proteins early in infection, which is reversed prior to nucleocapsid assembly in new virions. Among the multiple phosphosites of N, which are particularly dense in the serine/arginine-rich interdomain region, phospho-Thr205 is highly relevant for 14-3-3 recruitment by SARS-CoV-2 N. The context of this site is mutated in most SARS-CoV-2 variants of concern. Among mutations that increase infectious virus titers, the S202R mutation (B.1.526 Iota) causes a striking replication boost (∼166-fold), although its molecular consequences have remained unclear. Here, we show that the S202R-mutated N phosphopeptide exhibits a 5-fold higher affinity for human 14-3-3ζ than the Wuhan variant and we rationalize this effect by solving a high-resolution crystal structure of the complex. The structure revealed an enhanced 14-3-3/N interface contributed by the Arg202 side chain that, in contrast to Ser202, formed multiple stabilizing contacts with 14-3-3, including water-mediated H-bonds and guanidinium pi-pi stacking. These findings provide a compelling link between the replicative fitness of SARS-CoV-2 and the N protein's affinity for host 14-3-3 proteins.

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Protein

Chemical

Disease

Primary Citation of related structures