6YE3

IL-2 in complex with a Fab fragment from UFKA-20


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.89 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.218 

wwPDB Validation   3D Report Full Report



Literature

Receptor-gated IL-2 delivery by an anti-human IL-2 antibody activates regulatory T cells in three different species.

Karakus, U.Sahin, D.Mittl, P.R.E.Mooij, P.Koopman, G.Boyman, O.

(2020) Sci Transl Med 12

  • DOI: 10.1126/scitranslmed.abb9283
  • Primary Citation of Related Structures:  
    6YE3

  • PubMed Abstract: 
  • Stimulation of regulatory T (T reg ) cells holds great promise for the treatment of autoimmune, chronic inflammatory, and certain metabolic diseases. Recent clinical trials with low-dose interleukin-2 (IL-2) to expand T reg cel ...

    Stimulation of regulatory T (T reg ) cells holds great promise for the treatment of autoimmune, chronic inflammatory, and certain metabolic diseases. Recent clinical trials with low-dose interleukin-2 (IL-2) to expand T reg cells led to beneficial results in autoimmunity, but IL-2 immunotherapy can activate both T reg cells and pathogenic T cells. Use of IL-2 receptor α (IL-2Rα, CD25)-biased IL-2/anti-IL-2 antibody complexes improves IL-2 selectivity for T reg cells; however, the mechanism of action of such IL-2 complexes is incompletely understood, thus hampering their translation into clinical trials. Using a cell-based and dynamic IL-2R platform, we identified a particular anti-human IL-2 antibody, termed UFKA-20. When bound to UFKA-20, IL-2 failed to stimulate cells expressing IL-2Rβ (CD122) and IL-2Rγ (CD132), unless these cells also expressed high amounts of CD25. CD25 allowed IL-2/UFKA-20 complexes to bind, and binding to CD25 in the presence of CD122 and CD132 was followed by rapid dissociation of UFKA-20 from IL-2, delivery of IL-2 to CD122 and CD132, and intracellular signaling. IL-2/UFKA-20 complexes efficiently and preferentially stimulated CD4 + T reg cells in freshly isolated human T cells ex vivo and in mice and rhesus macaques in vivo. The crystal structure of the IL-2/UFKA-20 complex demonstrated that UFKA-20 interfered with IL-2 binding to CD122 and, to a lesser extent, also CD25. Together, we translated CD25-biased IL-2 complexes from mice to nonhuman primates and extended our mechanistic understanding of how CD25-biasing anti-human IL-2 antibodies work, which paves the way to clinical trials of CD25-biased IL-2 complexes.


    Organizational Affiliation

    Faculty of Medicine, University of Zurich, CH-8006 Zurich, Switzerland.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Chains: A,D,GADG447Homo sapiensMutation(s): 0 
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Chains: B,E,HBEH219Homo sapiensMutation(s): 0 
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Interleukin-2CFI134Homo sapiensMutation(s): 0 
Gene Names: IL2
Find proteins for P60568 (Homo sapiens)
Explore P60568 
Go to UniProtKB:  P60568
NIH Common Fund Data Resources
PHAROS  P60568
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  • Reference Sequence
Oligosaccharides

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Entity ID: 4
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
J, K, L
2 N-Glycosylation Oligosaccharides Interaction
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 238.384α = 90
b = 92.547β = 100.112
c = 121.892γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2020-12-30
    Type: Initial release