8FA1

Cryo-EM structure of the SARS-CoV-2 HR1HR2 fusion core complex with N969K mutation


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.51 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure-based design of a SARS-CoV-2 Omicron-specific inhibitor.

Yang, K.Wang, C.Kreutzberger, A.J.B.White, K.I.Pfuetzner, R.A.Esquivies, L.Kirchhausen, T.Brunger, A.T.

(2023) Proc Natl Acad Sci U S A 120: e2300360120-e2300360120

  • DOI: https://doi.org/10.1073/pnas.2300360120
  • Primary Citation of Related Structures:  
    7TIK, 8FA1, 8FA2

  • PubMed Abstract: 

    The Omicron variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) introduced a relatively large number of mutations, including three mutations in the highly conserved heptad repeat 1 (HR1) region of the spike glycoprotein (S) critical for its membrane fusion activity. We show that one of these mutations, N969K induces a substantial displacement in the structure of the heptad repeat 2 (HR2) backbone in the HR1HR2 postfusion bundle. Due to this mutation, fusion-entry peptide inhibitors based on the Wuhan strain sequence are less efficacious. Here, we report an Omicron-specific peptide inhibitor designed based on the structure of the Omicron HR1HR2 postfusion bundle. Specifically, we inserted an additional residue in HR2 near the Omicron HR1 K969 residue to better accommodate the N969K mutation and relieve the distortion in the structure of the HR1HR2 postfusion bundle it introduced. The designed inhibitor recovers the loss of inhibition activity of the original longHR2_42 peptide with the Wuhan strain sequence against the Omicron variant in both a cell-cell fusion assay and a vesicular stomatitis virus (VSV)-SARS-CoV-2 chimera infection assay, suggesting that a similar approach could be used to combat future variants. From a mechanistic perspective, our work suggests the interactions in the extended region of HR2 may mediate the initial landing of HR2 onto HR1 during the transition of the S protein from the prehairpin intermediate to the postfusion state.


  • Organizational Affiliation

    HHMI, Stanford University, Stanford, CA 94305.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ferritin, Dps family protein and Spike protein S2' chimera
A, B, C
257Nostoc punctiforme PCC 73102Severe acute respiratory syndrome coronavirus 2
This entity is chimeric
Mutation(s): 1 
Gene Names: Npun_R5799
UniProt
Find proteins for A0A8B6RKS7 (Severe acute respiratory syndrome coronavirus 2)
Explore A0A8B6RKS7 
Go to UniProtKB:  A0A8B6RKS7
Find proteins for B2J981 (Nostoc punctiforme (strain ATCC 29133 / PCC 73102))
Explore B2J981 
Go to UniProtKB:  B2J981
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsB2J981A0A8B6RKS7
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Spike protein S2' HR2
D, E, F
45Severe acute respiratory syndrome coronavirus 2Mutation(s): 0 
Gene Names: S2
UniProt
Find proteins for P0DTC2 (Severe acute respiratory syndrome coronavirus 2)
Explore P0DTC2 
Go to UniProtKB:  P0DTC2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DTC2
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.51 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2023-03-29
    Type: Initial release
  • Version 1.1: 2023-04-05
    Changes: Database references
  • Version 1.2: 2024-06-19
    Changes: Data collection