Crystal Structure of SARS Coronavirus Main Proteinase (P43212)

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.180 

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Ph-Dependent Conformational Flexibility of the Sars-Cov Main Proteinase (M(Pro)) Dimer: Molecular Dynamics Simulations and Multiple X-Ray Structure Analyses.

Tan, J.Verschueren, K.H.G.Anand, K.Shen, J.Yang, M.Xu, Y.Rao, Z.Bigalke, J.Heisen, B.Mesters, J.R.Chen, K.Shen, X.Jiang, H.Hilgenfeld, R.

(2005) J Mol Biol 354: 25

  • DOI: https://doi.org/10.1016/j.jmb.2005.09.012
  • Primary Citation of Related Structures:  
    2BX3, 2BX4

  • PubMed Abstract: 

    The SARS coronavirus main proteinase (M(pro)) is a key enzyme in the processing of the viral polyproteins and thus an attractive target for the discovery of drugs directed against SARS. The enzyme has been shown by X-ray crystallography to undergo significant pH-dependent conformational changes. Here, we assess the conformational flexibility of the M(pro) by analysis of multiple crystal structures (including two new crystal forms) and by molecular dynamics (MD) calculations. The MD simulations take into account the different protonation states of two histidine residues in the substrate-binding site and explain the pH-activity profile of the enzyme. The low enzymatic activity of the M(pro) monomer and the need for dimerization are also discussed.

  • Organizational Affiliation

    Center for Drug Discovery and Design, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3C-like proteinase nsp5306SARS coronavirus Sin2774Mutation(s): 0 
Gene Names: 1a
Find proteins for P0C6X7 (Severe acute respiratory syndrome coronavirus)
Explore P0C6X7 
Go to UniProtKB:  P0C6X7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C6X7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.180 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.675α = 90
b = 69.675β = 90
c = 100.197γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-09-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2019-07-24
    Changes: Data collection
  • Version 1.3: 2022-12-07
    Changes: Database references, Other, Source and taxonomy, Structure summary
  • Version 1.4: 2024-01-31
    Changes: Data collection, Refinement description