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Structure of the IFNγ receptor complex guides design of biased agonists

Journal Article · · Nature (London)
 [1];  [2];  [3];  [4];  [3];  [3];  [3];  [5];  [5];  [4];  [2];  [3]
  1. Stanford Univ. School of Medicine, Stanford, CA (United States); Univ. of Chicago, Chicago, IL (United States)
  2. Stanford Blood Center, Palo Alto, CA (United States); Stanford Univ., Palo Alto, CA (United States)
  3. Stanford Univ. School of Medicine, Stanford, CA (United States)
  4. Univ. of Osnabruck, Osnabruck (Germany)
  5. Univ. of Georgia, Athens, GA (United States)

The cytokine interferon-γ (IFNγ) is a central coordinator of innate and adaptive immunity, but its highly pleiotropic actions have diminished its prospects for use as an immunotherapeutic agent. Here, we took a structure-based approach to decoupling IFNγ pleiotropy. We engineered an affinity-enhanced variant of the ligand-binding chain of the IFNγ receptor IFNγR1, which enabled us to determine the crystal structure of the complete hexameric (2:2:2) IFNγ–IFNγR1–IFNγR2 signalling complex at 3.25 Å resolution. The structure reveals the mechanism underlying deficits in IFNγ responsiveness in mycobacterial disease syndrome resulting from a T168N mutation in IFNγR2, which impairs assembly of the full signalling complex. The topology of the hexameric complex offers a blueprint for engineering IFNγ variants to tune IFNγ receptor signalling output. Unexpectedly, we found that several partial IFNγ agonists exhibited biased gene-expression profiles. Here, these biased agonists retained the ability to induce upregulation of major histocompatibility complex class I antigen expression, but exhibited impaired induction of programmed death-ligand 1 expression in a wide range of human cancer cell lines, offering a route to decoupling immunostimulatory and immunosuppressive functions of IFNγ for therapeutic applications.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1505425
Journal Information:
Nature (London), Journal Name: Nature (London) Journal Issue: 7746 Vol. 567; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Cryo-EM analyses reveal the common mechanism and diversification in the activation of RET by different ligands journal September 2019
Cytokine Therapeutics in Cancer Immunotherapy: Design and Development journal June 2019
Interferon target-gene expression and epigenomic signatures in health and disease journal November 2019
Molecular engineering strategies for visualizing low-affinity protein complexes journal June 2019
“Designer cytokines” targeting the tumor vasculature—think global and act local journal January 2020

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