3BES

Structure of a Poxvirus ifngbp/ifng Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.219 

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This is version 2.1 of the entry. See complete history


Literature

Structure and mechanism of IFN-gamma antagonism by an orthopoxvirus IFN-gamma-binding protein.

Nuara, A.A.Walter, L.J.Logsdon, N.J.Yoon, S.I.Jones, B.C.Schriewer, J.M.Buller, R.M.Walter, M.R.

(2008) Proc Natl Acad Sci U S A 105: 1861-1866

  • DOI: https://doi.org/10.1073/pnas.0705753105
  • Primary Citation of Related Structures:  
    3BES

  • PubMed Abstract: 

    Ectromelia virus (ECTV) encodes an IFN-gamma-binding protein (IFN-gammaBP(ECTV)) that disrupts IFN-gamma signaling and its ability to induce an antiviral state within cells. IFN-gammaBP(ECTV) is an important virulence factor that is highly conserved (>90%) in all orthopoxviruses, including variola virus, the causative agent of smallpox. The 2.2-A crystal structure of the IFN-gammaBP(ECTV)/IFN-gamma complex reveals IFN-gammaBP(ECTV) consists of an IFN-gammaR1 ligand-binding domain and a 57-aa helix-turn-helix (HTH) motif that is structurally related to the transcription factor TFIIA. The HTH motif forms a tetramerization domain that results in an IFN-gammaBP(ECTV)/IFN-gamma complex containing four IFN-gammaBP(ECTV) chains and two IFN-gamma dimers. The structure, combined with biochemical and cell-based assays, demonstrates that IFN-gammaBP(ECTV) tetramers are required for efficient IFN-gamma antagonism.


  • Organizational Affiliation

    Center for Biophysical Sciences and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Interferon gammaA [auth L]139Homo sapiensMutation(s): 0 
Gene Names: IFNG
UniProt & NIH Common Fund Data Resources
Find proteins for P01579 (Homo sapiens)
Explore P01579 
Go to UniProtKB:  P01579
PHAROS:  P01579
GTEx:  ENSG00000111537 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01579
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Interferon-gamma binding protein C4RB [auth R]250Ectromelia virusMutation(s): 0 
Gene Names: C4RIFNGR
UniProt
Find proteins for Q66793 (Ectromelia virus (strain Moscow))
Explore Q66793 
Go to UniProtKB:  Q66793
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ66793
Glycosylation
Glycosylation Sites: 2
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseC [auth A]3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.219 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.63α = 90
b = 119.13β = 90
c = 184.74γ = 90
Software Package:
Software NamePurpose
SERGUIdata collection
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-02-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description
  • Version 1.3: 2018-01-24
    Changes: Structure summary
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary
  • Version 2.1: 2024-10-30
    Changes: Data collection, Database references, Structure summary