Human interleukin 17A

Experimental Data Snapshot

  • Resolution: 2.48 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.211 

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This is version 1.2 of the entry. See complete history


Crystal structures of interleukin 17A and its complex with IL-17 receptor A.

Liu, S.Song, X.Chrunyk, B.A.Shanker, S.Hoth, L.R.Marr, E.S.Griffor, M.C.

(2013) Nat Commun 4: 1888-1888

  • DOI: https://doi.org/10.1038/ncomms2880
  • Primary Citation of Related Structures:  
    4HR9, 4HSA

  • PubMed Abstract: 

    The constituent polypeptides of the interleukin-17 family form six different homodimeric cytokines (IL-17A-F) and the heterodimeric IL-17A/F. Their interactions with IL-17 receptors A-E (IL-17RA-E) mediate host defenses while also contributing to inflammatory and autoimmune responses. IL-17A and IL-17F both preferentially engage a receptor complex containing one molecule of IL-17RA and one molecule of IL-17RC. More generally, IL-17RA appears to be a shared receptor that pairs with other members of its family to allow signaling of different IL-17 cytokines. Here we report crystal structures of homodimeric IL-17A and its complex with IL-17RA. Binding to IL-17RA at one side of the IL-17A molecule induces a conformational change in the second, symmetry-related receptor site of IL-17A. This change favors, and is sufficient to account for, the selection of a different receptor polypeptide to complete the cytokine-receptor complex. The structural results are supported by biophysical studies with IL-17A variants produced by site-directed mutagenesis.

  • Organizational Affiliation

    Structural Biology and Biophysics Group, Pfizer Groton Laboratories, Eastern Point Road, Groton, Connecticut 06340, USA. shenping.liu@pfizer.com

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
122Homo sapiensMutation(s): 2 
Gene Names: IL17ACTLA8IL17
UniProt & NIH Common Fund Data Resources
Find proteins for Q16552 (Homo sapiens)
Explore Q16552 
Go to UniProtKB:  Q16552
PHAROS:  Q16552
GTEx:  ENSG00000112115 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16552
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.48 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.211 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.35α = 90
b = 85.25β = 90
c = 119.86γ = 90
Software Package:
Software NamePurpose

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2013-05-22 
  • Deposition Author(s): Liu, S.

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-22
    Type: Initial release
  • Version 1.1: 2013-06-05
    Changes: Database references
  • Version 1.2: 2013-06-19
    Changes: Database references