crystal structure of the wildtype MHV coronavirus non-structural protein nsp15

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.201 

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New Antiviral Target Revealed by the Hexameric Structure of Mouse Hepatitis Virus Nonstructural Protein nsp15

Xu, X.Zhai, Y.Sun, F.Lou, Z.Su, D.Xu, Y.Zhang, R.Joachimiak, A.Zhang, X.C.Bartlam, M.Rao, Z.

(2006) J Virol 80: 7909-7917

  • DOI: https://doi.org/10.1128/JVI.00525-06
  • Primary Citation of Related Structures:  
    2GTH, 2GTI

  • PubMed Abstract: 

    The unique coronavirus transcription/replication machinery comprised of multiple virus-encoded nonstructural proteins (nsp) plays a vital role during initial and intermediate phases of the viral life cycle. The crystal structure of mouse hepatitis virus strain A59 (MHV-A59) nsp15 is reported at 2.15-A resolution. nsp15 is an XendoU endoribonuclease and is the first one from this family to have its structure unveiled. The MHV-A59 nsp15 monomer structure has a novel protein fold. Two nsp15 trimers form a back-to-back hexamer that is believed to be the functional unit. The structure reveals the catalytic site including the highly conserved residues His262, His277, and Lys317, which is supported by mutagenesis analysis. Gel filtration and enzyme activity assays confirmed that the hexamer is the active form for nsp15 and demonstrate the specificity of nsp15 for uridylate. The high sequence conservation of nsp15 in coronaviruses, including that of severe acute respiratory syndrome, suggests that this protein may provide a new target for the design of antiviral therapeutics.

  • Organizational Affiliation

    Tsinghua-IBP Joint Research Group for Structural Biology, Tsinghua University, Beijing 100084, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Replicase polyprotein 1ab370Murine hepatitis virus strain A59Mutation(s): 0 
Find proteins for Q9J3E8 (Murine hepatitis virus)
Explore Q9J3E8 
Go to UniProtKB:  Q9J3E8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9J3E8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.201 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.435α = 90
b = 86.435β = 90
c = 219.22γ = 120
Software Package:
Software NamePurpose
CrystalCleardata collection
HKL-2000data reduction
CrystalCleardata reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-15
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Source and taxonomy, Version format compliance
  • Version 1.3: 2023-10-25
    Changes: Data collection, Database references, Refinement description