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A High Resolution Method to Monitor Phosphorylation-dependent Activation of IRF3
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NSD3 keeps IRF3 active.

Takashi Mino1, Osamu Takeuchi1

  • 1Laboratory of Infection and Prevention, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan; Japan Agency for Medical Research and Development-Core Research for Evolutional Medical Science and Technology (AMED-CREST), Tokyo, Japan.

The Journal of Experimental Medicine
|November 22, 2017
PubMed
Summary
This summary is machine-generated.

Researchers discovered that methyltransferase NSD3 monomethylates the transcription factor IRF3. This process enhances IRF3 phosphorylation, boosting antiviral innate immune responses.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Virology

Background:

  • The innate immune system provides the first line of defense against viral infections.
  • Transcription factors like Interferon Regulatory Factor 3 (IRF3) are crucial for initiating antiviral responses.
  • Post-translational modifications, such as phosphorylation and methylation, regulate protein function and immune signaling.

Purpose of the Study:

  • To elucidate a novel molecular mechanism underlying antiviral innate immunity.
  • To investigate the role of methyltransferase NSD3 in regulating IRF3 activity.
  • To understand how IRF3 phosphorylation is maintained to promote antiviral responses.

Main Methods:

  • The study utilized biochemical assays to demonstrate direct interaction and modification of IRF3 by NSD3.
  • Western blotting and reporter assays were employed to assess IRF3 phosphorylation and transcriptional activity.
  • Viral challenge models were used to evaluate the impact on innate immune responses.

Main Results:

  • Methyltransferase NSD3 was found to directly monomethylate the transcription factor IRF3.
  • NSD3-mediated monomethylation maintains IRF3 phosphorylation.
  • Enhanced IRF3 phosphorylation leads to increased transcriptional activity and potent antiviral innate immune responses.

Conclusions:

  • NSD3 acts as a key regulator of antiviral innate immunity through direct modification of IRF3.
  • The monomethylation of IRF3 by NSD3 is a novel mechanism to enhance innate antiviral defenses.
  • Targeting the NSD3-IRF3 axis could offer new therapeutic strategies against viral infections.