6H41

Structure of the complex of the IL-5 inhibitory peptide AF17121 bound to the IL-5 receptor IL-5Ralpha


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 

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Literature

Structural Basis of Interleukin-5 Inhibition by the Small Cyclic Peptide AF17121.

Scheide-Noeth, J.P.Rosen, M.Baumstark, D.Dietz, H.Mueller, T.D.

(2019) J Mol Biol 431: 714-731

  • DOI: https://doi.org/10.1016/j.jmb.2018.11.029
  • Primary Citation of Related Structures:  
    6H41

  • PubMed Abstract: 

    Interleukin-5 (IL-5) is a T-helper cell of subtype 2 cytokine involved in many aspects of eosinophil life. Eosinophilic granulocytes play a pathogenic role in the progression of atopic diseases, such as allergy, asthma and atopic dermatitis and hypereosinophilic syndromes. Here, eosinophils upon activation degranulate leading to the release of proinflammatory proteins and mediators stored in intracellular vesicles termed granula thereby causing local inflammation, which when persisting leads to tissue damage and organ failure. As a key regulator of eosinophil function, IL-5 therefore presents a major pharmaceutical target and approaches to interfere with IL-5 receptor activation are of great interest. Here we present the structure of the IL-5 inhibiting peptide AF17121 bound to the extracellular domain of the IL-5 receptor IL-5Rα. The small 18mer cyclic peptide snugly fits into the wrench-like cleft of the IL-5 receptor, thereby blocking access of key residues for IL-5 binding. While AF17121 and IL-5 seemingly bind to a similar epitope at IL-5Rα, functional studies show that recognition and binding of both ligands differ. Using the structure data, peptide variants with improved IL-5 inhibition have been generated, which might present valuable starting points for superior peptide-based IL-5 antagonists.


  • Organizational Affiliation

    Department of Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute of the University Wuerzburg, Julius-von-Sachs-Platz 2, D-97082, Wuerzburg, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Interleukin-5 receptor subunit alpha309Homo sapiensMutation(s): 1 
Gene Names: IL5RAIL5R
UniProt & NIH Common Fund Data Resources
Find proteins for Q01344 (Homo sapiens)
Explore Q01344 
Go to UniProtKB:  Q01344
PHAROS:  Q01344
GTEx:  ENSG00000091181 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ01344
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
VAL-ASP-GLU-CYS-TRP-ARG-ILE-ILE-ALA-SER-HIS-THR-TRP-PHE-CYS-ALA-GLU-GLU18synthetic constructMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 
  • Space Group: P 64 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 138.061α = 90
b = 138.061β = 90
c = 145.855γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research FoundationGermanyMU1095/7-1

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-26
    Type: Initial release
  • Version 1.1: 2019-02-27
    Changes: Data collection, Database references