7CTT

Cryo-EM structure of Favipiravir bound to replicating polymerase complex of SARS-CoV-2 in the pre-catalytic state.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 2.3 of the entry. See complete history


Literature

Structural Basis of SARS-CoV-2 Polymerase Inhibition by Favipiravir.

Peng, Q.Peng, R.Yuan, B.Wang, M.Zhao, J.Fu, L.Qi, J.Shi, Y.

(2021) Innovation (Camb) 2: 100080-100080

  • DOI: https://doi.org/10.1016/j.xinn.2021.100080
  • Primary Citation of Related Structures:  
    7CTT

  • PubMed Abstract: 

    The outbreak of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has developed into an unprecedented global pandemic. Nucleoside analogs, such as Remdesivir and Favipiravir, can serve as the first-line broad-spectrum antiviral drugs by targeting the viral polymerases. However, the underlying mechanisms for the antiviral efficacies of these drugs are far from well understood. Here, we reveal that Favipiravir, as a pyrazine derivative, could be incorporated into the viral RNA products by mimicking both adenine and guanine nucleotides. This drug thus inhibits viral replication mainly by inducing mutations in progeny RNAs, different from Remdesivir or other RNA-terminating nucleoside analogs that impair the elongation of RNA products. We further determined the cryo-EM structure of Favipiravir bound to the replicating polymerase complex of SARS-CoV-2 in the pre-catalytic state. This structure provides a missing snapshot for visualizing the catalysis dynamics of coronavirus polymerase, and reveals an unexpected base-pairing pattern between Favipiravir and pyrimidine residues that may explain its capacity for mimicking both adenine and guanine nucleotides. These findings shed light on the mechanism of coronavirus polymerase catalysis and provide a rational basis for developing antiviral drugs to combat the SARS-CoV-2 pandemic.


  • Organizational Affiliation

    CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RNA-directed RNA polymerase932Severe acute respiratory syndrome coronavirus 2Mutation(s): 0 
Gene Names: rep1a-1b
EC: 2.7.7.48
UniProt
Find proteins for P0DTD1 (Severe acute respiratory syndrome coronavirus 2)
Explore P0DTD1 
Go to UniProtKB:  P0DTD1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DTD1
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Non-structural protein 8
B, D
198Severe acute respiratory syndrome coronavirus 2Mutation(s): 0 
Gene Names: rep1a-1b
UniProt
Find proteins for P0DTD1 (Severe acute respiratory syndrome coronavirus 2)
Explore P0DTD1 
Go to UniProtKB:  P0DTD1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DTD1
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Non-structural protein 783Severe acute respiratory syndrome coronavirus 2Mutation(s): 0 
Gene Names: rep1a-1b
UniProt
Find proteins for P0DTD1 (Severe acute respiratory syndrome coronavirus 2)
Explore P0DTD1 
Go to UniProtKB:  P0DTD1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DTD1
Sequence Annotations
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  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 4
MoleculeChains LengthOrganismImage
Primer-RNA (5'-R(P*UP*UP*CP*UP*CP*CP*UP*AP*AP*GP*AP*AP*GP*CP*UP*A)-3')E [auth Q]20Severe acute respiratory syndrome coronavirus 2
Sequence Annotations
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  • Reference Sequence
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Entity ID: 5
MoleculeChains LengthOrganismImage
Template-RNA (5'-R(P*AP*CP*UP*AP*GP*CP*UP*UP*CP*UP*UP*AP*GP*GP*AP*GP*AP*A)-3')F [auth T]40Severe acute respiratory syndrome coronavirus 2
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China81622031

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-02
    Type: Initial release
  • Version 2.0: 2020-11-11
    Type: Coordinate replacement
    Reason: Atomic clashes
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Refinement description
  • Version 2.1: 2021-03-10
    Changes: Structure summary
  • Version 2.2: 2021-09-15
    Changes: Database references
  • Version 2.3: 2024-05-29
    Changes: Data collection, Database references