Crystal structure of SARS coronavirus NSP9

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.248 
  • R-Value Observed: 0.250 

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This is version 1.3 of the entry. See complete history


The severe acute respiratory syndrome-coronavirus replicative protein nsp9 is a single-stranded RNA-binding subunit unique in the RNA virus world.

Egloff, M.P.Ferron, F.Campanacci, V.Longhi, S.Rancurel, C.Dutartre, H.Snijder, E.J.Gorbalenya, A.E.Cambillau, C.Canard, B.

(2004) Proc Natl Acad Sci U S A 101: 3792-3796

  • DOI: https://doi.org/10.1073/pnas.0307877101
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The recently identified etiological agent of the severe acute respiratory syndrome (SARS) belongs to Coronaviridae (CoV), a family of viruses replicating by a poorly understood mechanism. Here, we report the crystal structure at 2.7-A resolution of nsp9, a hitherto uncharacterized subunit of the SARS-CoV replicative polyproteins. We show that SARS-CoV nsp9 is a single-stranded RNA-binding protein displaying a previously unreported, oligosaccharide/oligonucleotide fold-like fold. The presence of this type of protein has not been detected in the replicative complexes of RNA viruses, and its presence may reflect the unique and complex CoV viral replication/transcription machinery.

  • Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques, Unité Mixte de Recherche 6098 Centre National de la Recherche Scientifique and Universités Aix-Marseille I et II, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
polyprotein 1ab
A, B
113Severe acute respiratory syndrome-related coronavirusMutation(s): 0 
Gene Names: NSP9
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: 2.70 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.248 
  • R-Value Observed: 0.250 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.115α = 90
b = 89.115β = 90
c = 136.675γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-02-24
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations, Refinement description