Crystal Structure of Double Loop-Swapped Interleukin-36Ra

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

Starting Model: experimental
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Molecular Determinants of Agonist and Antagonist Signaling through the IL-36 Receptor.

Gunther, S.Sundberg, E.J.

(2014) J Immunol 193: 921-930

  • DOI: https://doi.org/10.4049/jimmunol.1400538
  • Primary Citation of Related Structures:  
    4IZE, 4P0J, 4P0K, 4P0L

  • PubMed Abstract: 

    The IL-1 family consists of 11 cytokines that control a complex network of proinflammatory signals critical for regulating immune responses to infections. They also play a central role in numerous chronic inflammatory disorders. Accordingly, inhibiting the activities of these cytokines is an important therapeutic strategy for treating autoimmune diseases and lymphomas. Agonist cytokines in the IL-1 family activate signaling by binding their cognate receptor and then recruiting a receptor accessory protein. Conversely, antagonist cytokines bind their cognate receptor but prohibit recruitment of receptor accessory protein, which precludes functional signaling complexes. The IL-36 subfamily of cytokines is the most diverse, including three agonists and at least one antagonist, and is the least well-characterized group within this family. Signaling through the IL-36 receptor directly stimulates dendritic cells and primes naive CD4 T cells for Th1 responses. Appropriately balanced IL-36 signaling is a critical determinant of skin and lung health. IL-36 signaling has been presumed to function analogously to IL-1 signaling. In this study, we have defined molecular determinants of agonist and antagonist signaling through the IL-36 receptor. We present the crystal structure of IL-36γ, which, to our knowledge, is the first reported structure of an IL-36 agonist. Using this structure as a guide, we designed a comprehensive series of IL-36 agonist/antagonist chimeric proteins for which we measured binding to the IL-36 receptor/IL-1 receptor accessory protein complex and functional activation and inhibition of signaling. Our data reveal how the fine specificity of IL-36 signaling is distinct from that of IL-1.

  • Organizational Affiliation

    Institute of Human Virology, University of Maryland School of Medicine, Baltimore, MD 21201;

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Interleukin-36 receptor antagonist/Interleukin-36 gamma chimera protein154Homo sapiensMutation(s): 1 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NZH8 (Homo sapiens)
Explore Q9NZH8 
Go to UniProtKB:  Q9NZH8
GTEx:  ENSG00000136688 
Find proteins for Q9UBH0 (Homo sapiens)
Explore Q9UBH0 
Go to UniProtKB:  Q9UBH0
GTEx:  ENSG00000136695 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ9UBH0Q9NZH8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.115α = 90
b = 43.115β = 90
c = 119.122γ = 120
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata scaling
Aimlessdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
American Asthma FoundationUnited States13-0066

Revision History  (Full details and data files)

  • Version 1.0: 2014-06-25
    Type: Initial release
  • Version 1.1: 2014-07-16
    Changes: Database references
  • Version 1.2: 2015-02-04
    Changes: Derived calculations
  • Version 1.3: 2017-10-04
    Changes: Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Refinement description