1FG9

3:1 COMPLEX OF INTERFERON-GAMMA RECEPTOR WITH INTERFERON-GAMMA DIMER


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.237 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Observation of an unexpected third receptor molecule in the crystal structure of human interferon-gamma receptor complex.

Thiel, D.J.le Du, M.H.Walter, R.L.D'Arcy, A.Chene, C.Fountoulakis, M.Garotta, G.Winkler, F.K.Ealick, S.E.

(2000) Structure 8: 927-936

  • DOI: https://doi.org/10.1016/s0969-2126(00)00184-2
  • Primary Citation of Related Structures:  
    1FG9

  • PubMed Abstract: 

    Molecular interactions among cytokines and cytokine receptors form the basis of many cell-signaling pathways relevant to immune function. Interferon-gamma (IFN-gamma) signals through a multimeric receptor complex consisting of two different but structurally related transmembrane chains: the high-affinity receptor-binding subunit (IFN-gammaRalpha) and a species-specific accessory factor (AF-1 or IFN-gammaRbeta). In the signaling complex, the two receptors probably interact with one another through their extracellular domains. Understanding the atomic interactions of signaling complexes enhances the ability to control and alter cell signaling and also provides a greater understanding of basic biochemical processes. The crystal structure of the complex of human IFN-gamma with the soluble, glycosylated extracellular part of IFN-gammaRalpha has been determined at 2.9 A resolution using multiwavelength anomalous diffraction methods. In addition to the expected 2:1 complex, the crystal structure reveals the presence of a third receptor molecule not directly associated with the IFN-gamma dimer. Two distinct intermolecular contacts, involving the edge strands of the C-terminal domains, are observed between this extra receptor and the 2:1 receptor-ligand complex thereby forming a 3:1 complex. The observed interactions in the 2:1 complex of the high-affinity cell-surface receptor with the IFN-gamma cytokine are similar to those seen in a previously reported structure where the receptor chains were not glycosylated. The formation of beta-sheet packing interactions between pairs of IFN-gammaRalpha receptors in these crystals suggests a possible model for receptor oligomerization of Ralpha and the structurally homologous Rbeta receptors in the fully active IFN-gamma signaling complex.


  • Organizational Affiliation

    Section of Biochemistry, Molecular & Cell Biology, Cornell University, Ithaca, NY 14853, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
INTERFERON GAMMA
A, B
134Homo sapiensMutation(s): 0 
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 RECEPTOR ALPHA CHAIN
C, D, E
245Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P15260 (Homo sapiens)
Explore P15260 
Go to UniProtKB:  P15260
PHAROS:  P15260
GTEx:  ENSG00000027697 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15260
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.237 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 199.3α = 90
b = 114.65β = 116.27
c = 74.34γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
MLPHAREphasing
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-08-11
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-12-21
    Changes: Database references