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A High Resolution Method to Monitor Phosphorylation-dependent Activation of IRF3
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Interferon, restriction factors and SUMO pathways.

Faten El-Asmi1, Francis P McManus2, Pierre Thibault3

  • 1INSERM UMR-S 1124, UniversitĂ© Paris Descartes, 45 rue des Saints Pères, 75006, Paris, France.

Cytokine & Growth Factor Reviews
|June 28, 2020
PubMed
Summary
This summary is machine-generated.

SUMOylation, a key regulator of cellular processes and antiviral defense, involves three SUMO paralogs. These paralogs differentially impact interferon signaling and the stability of interferon-stimulated genes.

Keywords:
IFNISG15PMLSUMOTRIM25Ubiquitin

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Area of Science:

  • Molecular Biology
  • Immunology
  • Post-Translational Modifications

Background:

  • SUMOylation is a reversible post-translational modification crucial for regulating protein stability, localization, and interactions.
  • It plays a significant role in the interferon (IFN) pathway and antiviral defense mechanisms.
  • Human cells express three SUMO paralogs (SUMO1, SUMO2, SUMO3) involved in intrinsic and innate immunity.

Purpose of the Study:

  • To review the differential effects of SUMO paralogs on interferon signaling.
  • To examine the impact of SUMO paralogs on the stabilization and destabilization of interferon-stimulated gene (ISG) products.
  • To highlight the interplay between SUMOylation and other post-translational modifications.

Main Methods:

  • Review of existing literature on SUMOylation, interferon pathways, and antiviral defense.
  • Analysis of studies detailing the roles of SUMO paralogs (SUMO1, SUMO2, SUMO3) in immune responses.
  • Examination of research on the regulation of ISG products and their modification by SUMOylation.

Main Results:

  • SUMO paralogs exhibit distinct regulatory effects on IFN synthesis, IFN signaling, and ISG expression/function.
  • IFN treatment enhances global cellular SUMOylation, requiring the E3 SUMO ligase PML.
  • Several restriction factors are SUMO-conjugated, with modifications increasing upon IFN stimulation.

Conclusions:

  • SUMOylation, through its distinct paralogs, significantly modulates IFN signaling and ISG product stability.
  • There is a complex crosstalk between SUMOylation and other modifications like ubiquitination and ISGylation in antiviral defense.
  • Understanding these differential SUMO paralog effects is crucial for comprehending innate immunity and developing antiviral strategies.