Crystal structure of the N-terminal domain of the PA subunit of Thogoto virus polymerase (form 1)

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.203 

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Comparative Structural and Functional Analysis of Orthomyxovirus Polymerase CAP-Snatching Domains.

Guilligay, D.Kadlec, J.Crepin, T.Lunardi, T.Bouvier, D.Kochs, G.Ruigrok, R.W.H.Cusack, S.

(2014) PLoS One 9: 84973

  • DOI: https://doi.org/10.1371/journal.pone.0084973
  • Primary Citation of Related Structures:  
    4CGS, 4CGX, 4CHC, 4CHD, 4CHE, 4CHF

  • PubMed Abstract: 

    Orthomyxovirus Influenza A virus (IAV) heterotrimeric polymerase performs transcription of viral mRNAs by cap-snatching, which involves generation of capped primers by host pre-mRNA binding via the PB2 subunit cap-binding site and cleavage 10-13 nucleotides from the 5' cap by the PA subunit endonuclease. Thogotoviruses, tick-borne orthomyxoviruses that includes Thogoto (THOV), Dhori (DHOV) and Jos (JOSV) viruses, are thought to perform cap-snatching by cleaving directly after the cap and thus have no heterogeneous, host-derived sequences at the 5' extremity of their mRNAs. Based on recent work identifying the cap-binding and endonuclease domains in IAV polymerase, we determined the crystal structures of two THOV PB2 domains, the putative cap-binding and the so-called '627-domain', and the structures of the putative endonuclease domains (PA-Nter) of THOV and DHOV. Despite low sequence similarity, corresponding domains have the same fold confirming the overall architectural similarity of orthomyxovirus polymerases. However the putative Thogotovirus cap-snatching domains in PA and PB2 have non-conservative substitutions of key active site residues. Biochemical analysis confirms that, unlike the IAV domains, the THOV and DHOV PA-Nter domains do not bind divalent cations and have no endonuclease activity and the THOV central PB2 domain does not bind cap analogues. On the other hand, sequence analysis suggests that other, non-influenza, orthomyxoviruses, such as salmon anemia virus (isavirus) and Quaranfil virus likely conserve active cap-snatching domains correlating with the reported occurrence of heterogeneous, host-derived sequences at the 5' end of the mRNAs of these viruses. These results highlight the unusual nature of transcription initiation by Thogotoviruses.

  • Organizational Affiliation

    University Grenoble Alpes, Unit of Virus Host-Cell Interactions, Grenoble, France ; Centre National de la Recherche Scientifique, Unit of Virus Host-Cell Interactions, Grenoble, France ; European Molecular Biology Laboratory, Grenoble Outstation and Unit of Virus Host-Cell Interactions, Grenoble, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
177Thogotovirus thogotoenseMutation(s): 0 
Find proteins for P27194 (Thogoto virus (isolate SiAr 126))
Explore P27194 
Go to UniProtKB:  P27194
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27194
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.203 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.93α = 90
b = 77.23β = 123.27
c = 67.75γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-05
    Type: Initial release
  • Version 1.1: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description