2UXE

The structure of Vaccinia virus N1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.237 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Functional and Structural Studies of the Vaccinia Virus Virulence Factor N1 Reveal a Bcl-2-Like Anti- Apoptotic Protein

Cooray, S.Bahar, M.W.Abrescia, N.G.A.Mcvey, C.E.Bartlett, N.W.Chen, R.A.-J.Stuart, D.I.Grimes, J.M.Smith, G.L.

(2007) J.Gen.Virol. 88: 1656

  • DOI: 10.1099/vir.0.82772-0

  • PubMed Abstract: 
  • Vaccinia virus (VACV) encodes many immunomodulatory proteins, including inhibitors of apoptosis and modulators of innate immune signalling. VACV protein N1 is an intracellular homodimer that contributes to virus virulence and was reported to inhibit ...

    Vaccinia virus (VACV) encodes many immunomodulatory proteins, including inhibitors of apoptosis and modulators of innate immune signalling. VACV protein N1 is an intracellular homodimer that contributes to virus virulence and was reported to inhibit nuclear factor (NF)-kappaB signalling. However, analysis of NF-kappaB signalling in cells infected with recombinant viruses with or without the N1L gene showed no difference in NF-kappaB-dependent gene expression. Given that N1 promotes virus virulence, other possible functions of N1 were investigated and this revealed that N1 is an inhibitor of apoptosis in cells transfected with the N1L gene and in the context of VACV infection. In support of this finding virally expressed N1 co-precipitated with endogenous pro-apoptotic Bcl-2 proteins Bid, Bad and Bax as well as with Bad and Bax expressed by transfection. In addition, the crystal structure of N1 was solved to 2.9 A resolution (0.29 nm). Remarkably, although N1 shows no sequence similarity to cellular proteins, its three-dimensional structure closely resembles Bcl-x(L) and other members of the Bcl-2 protein family. The structure also reveals that N1 has a constitutively open surface groove similar to the grooves of other anti-apoptotic Bcl-2 proteins, which bind the BH3 motifs of pro-apoptotic Bcl-2 family members. Molecular modelling of BH3 peptides into the N1 surface groove, together with analysis of their physico-chemical properties, suggests a mechanism for the specificity of peptide recognition. This study illustrates the importance of the evolutionary conservation of structure, rather than sequence, in protein function and reveals a novel anti-apoptotic protein from orthopoxviruses.


    Organizational Affiliation

    Department of Virology, Faculty of Medicine, Imperial College London, St Mary's Campus, Norfolk Place, London W2 1PG, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HYPOTHETICAL PROTEIN
A, B, C, D, E, F
117Vaccinia virusGene Names: N1L (VACV_BRZ_SERRO2_026)
Find proteins for Q49PX0 (Vaccinia virus)
Go to UniProtKB:  Q49PX0
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D, E, F
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.237 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 71.682α = 90.00
b = 108.999β = 110.58
c = 70.088γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SOLVEphasing
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-05-22
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance