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Updated: Jun 1, 2025

Characterization of Glycoproteins with the Immunoglobulin Fold by X-Ray Crystallography and Biophysical Techniques
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Structural studies of the IFNλ4 receptor complex using cryoEM enabled by protein engineering.

William S Grubbe1, Bixia Zhang2, Aileen Kauffman1

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Researchers developed a method to produce and structurally analyze Interferon lambda 4 (IFNλ4), revealing its receptor interactions. This breakthrough explains IFNλ4’s paradoxical effects on viral clearance and enables future therapeutic strategies.

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Area of Science:

  • Immunology
  • Structural Biology
  • Virology

Background:

  • Interferon lambda 4 (IFNλ4) discovery in 2013 linked to viral clearance issues.
  • Previous structural and functional studies limited by difficulties in protein production.
  • Understanding IFNλ4's paradoxical behavior requires detailed structural and functional characterization.

Purpose of the Study:

  • To develop a method for robust production of IFNλ4.
  • To determine the high-resolution structures of IFNλ4 and IFNλ3 in complex with their receptors.
  • To elucidate the structural basis for differences in receptor engagement and signaling.

Main Methods:

  • Robust production of IFNλ4 protein.
  • Yeast surface display for affinity maturation of IL10Rβ.
  • Cryogenic electron microscopy (cryo-EM) to solve structures of IFNλ4/IFNλR1/IL10Rβ and IFNλ3/IFNλR1/IL10Rβ complexes.
  • Molecular modeling and simulation for structural analysis.

Main Results:

  • Successfully produced and purified IFNλ4 protein.
  • Determined 72 kDa structures of IFNλ4 and IFNλ3 bound to their receptors (IFNλR1 and IL10Rβ) at 3.26 Å and 3.00 Å resolution, respectively.
  • Identified distinct receptor engagement and a 12-degree rotation in receptor geometry between IFNλ4 and IFNλ3 complexes.
  • Discovered a unique region in IFNλ4 that, upon modification, enables protein secretion.

Conclusions:

  • The study provides the first structural and functional insights into IFNλ4.
  • Structural differences explain variations in cell signaling, gene induction, and antiviral activities.
  • Findings pave the way for understanding and potentially correcting IFNλ4 dysfunction.