2A5A

Crystal structure of unbound SARS coronavirus main peptidase in the space group C2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.08 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Crystal Structures of the Main Peptidase from the SARS Coronavirus Inhibited by a Substrate-like Aza-peptide Epoxide

Lee, T.-W.Cherney, M.M.Huitema, C.Liu, J.James, K.E.Powers, J.C.Eltis, L.D.James, M.N.

(2005) J Mol Biol 353: 1137-1151

  • DOI: https://doi.org/10.1016/j.jmb.2005.09.004
  • Primary Citation of Related Structures:  
    2A5A, 2A5I, 2A5K

  • PubMed Abstract: 

    The main peptidase (M(pro)) from the coronavirus (CoV) causing severe acute respiratory syndrome (SARS) is one of the most attractive molecular targets for the development of anti-SARS agents. We report the irreversible inhibition of SARS-CoV M(pro) by an aza-peptide epoxide (APE; k(inact)/K(i) = 1900(+/-400) M(-1) s(-1)). The crystal structures of the M(pro):APE complex in the space groups C2 and P2(1)2(1)2(1) revealed the formation of a covalent bond between the catalytic Cys145 S(gamma) atom of the peptidase and the epoxide C3 atom of the inhibitor, substantiating the mode of action of this class of cysteine-peptidase inhibitors. The aza-peptide component of APE binds in the substrate-binding regions of M(pro) in a substrate-like manner, with excellent structural and chemical complementarity. In addition, the crystal structure of unbound M(pro) in the space group C2 revealed that the "N-fingers" (N-terminal residues 1 to 7) of both protomers of M(pro) are well defined and the substrate-binding regions of both protomers are in the catalytically competent conformation at the crystallization pH of 6.5, contrary to the previously determined crystal structures of unbound M(pro) in the space group P2(1).


  • Organizational Affiliation

    Canadian Institute of Health Research Group in Protein Structure and Function, Department of Biochemistry, University of Alberta, Edmonton, Alta., Canada T6G 2H7.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3C-like peptidase306Severe acute respiratory syndrome-related coronavirusMutation(s): 0 
EC: 3.4.22
UniProt
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
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.08 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 107.758α = 90
b = 82.14β = 104.87
c = 53.128γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-10-25
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-02-12
    Changes: Advisory, Data collection, Derived calculations
  • Version 1.4: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description