7EO8

Crystal structure of SARS coronavirus main protease in complex with an inhibitor Shikonin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.229 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structure-Based Discovery and Structural Basis of a Novel Broad-Spectrum Natural Product against the Main Protease of Coronavirus.

Zhang, Y.Gao, H.Hu, X.Wang, Q.Zhong, F.Zhou, X.Lin, C.Yang, Y.Wei, J.Du, W.Huang, H.Zhou, H.He, W.Zhang, H.Zhang, Y.McCormick, P.J.Fu, J.Wang, D.Fu, Y.Lu, X.Zhang, T.Duan, J.Qin, B.Jiang, H.Luo, J.Zhang, Y.Chen, Q.Luo, Q.Cheng, L.Zhang, Z.Zhang, J.Li, J.

(2022) J Virol 96: e0125321-e0125321

  • DOI: https://doi.org/10.1128/JVI.01253-21
  • Primary Citation of Related Structures:  
    7DQZ, 7EO7, 7EO8

  • PubMed Abstract: 

    Over the past 20 years, the severe acute respiratory syndrome coronavirus (SARS-CoV), Middle East respiratory syndrome CoV (MERS-CoV), and SARS-CoV-2 emerged, causing severe human respiratory diseases throughout the globe. Developing broad-spectrum drugs would be invaluable in responding to new, emerging coronaviruses and to address unmet urgent clinical needs. Main protease (M pro ; also known as 3CL pro ) has a major role in the coronavirus life cycle and is one of the most important targets for anti-coronavirus agents. We show that a natural product, noncovalent inhibitor, shikonin, is a pan-main protease inhibitor of SARS-CoV-2, SARS-CoV, MERS-CoV, human coronavirus (HCoV)-HKU1, HCoV-NL63, and HCoV-229E with micromolar half maximal inhibitory concentration (IC 50 ) values. Structures of the main protease of different coronavirus genus, SARS-CoV from the betacoronavirus genus and HCoV-NL63 from the alphacoronavirus genus, were determined by X-ray crystallography and revealed that the inhibitor interacts with key active site residues in a unique mode. The structure of the main protease inhibitor complex presents an opportunity to discover a novel series of broad-spectrum inhibitors. These data provide substantial evidence that shikonin and its derivatives may be effective against most coronaviruses as well as emerging coronaviruses of the future. Given the importance of the main protease for coronavirus therapeutic indication, insights from these studies should accelerate the development and design of safer and more effective antiviral agents. IMPORTANCE The current pandemic has created an urgent need for broad-spectrum inhibitors of SARS-CoV-2. The main protease is relatively conservative compared to the spike protein and, thus, is one of the most promising targets in developing anti-coronavirus agents. We solved the crystal structures of the main protease of SARS-CoV and HCoV-NL63 that bound to shikonin. The structures provide important insights, have broad implications for understanding the structural basis underlying enzyme activity, and can facilitate rational design of broad-spectrum anti-coronavirus ligands as new therapeutic agents.


  • Organizational Affiliation

    School of Basic Medical Sciences, Nanchang Universitygrid.260463.5, Nanchang, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3C-like proteinase
A, B
306Severe acute respiratory syndrome-related coronavirusMutation(s): 0 
EC: 3.4.22.69
UniProt
Find proteins for P0C6U8 (Severe acute respiratory syndrome coronavirus)
Explore P0C6U8 
Go to UniProtKB:  P0C6U8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C6U8
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FNO (Subject of Investigation/LOI)
Query on FNO

Download Ideal Coordinates CCD File 
C [auth A]2-[(1R)-4-methyl-1-oxidanyl-pent-3-enyl]-5,8-bis(oxidanyl)naphthalene-1,4-dione
C16 H16 O5
NEZONWMXZKDMKF-SNVBAGLBSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.229 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.336α = 90.94
b = 60.62β = 102.703
c = 68.295γ = 108.62
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2021-10-20
    Type: Initial release
  • Version 1.1: 2022-05-04
    Changes: Database references
  • Version 1.2: 2023-11-29
    Changes: Data collection, Refinement description