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TRIM59 interacts with ECSIT and negatively regulates NF-κB and IRF-3/7-mediated signal pathways

Takeshi Kondo1, Masashi Watanabe, Shigetsugu Hatakeyama

  • 1Department of Biochemistry, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan.

Biochemical and Biophysical Research Communications
|May 17, 2012
PubMed

Insights

Tripartite motif 59 (TRIM59) negatively regulates innate immune signaling. This study reveals TRIM59 interacts with ECSIT and represses key signaling pathways like NF-κB and interferon regulatory factors (IRFs).

Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Signaling

Background:

  • Innate immunity relies on pattern recognition receptors (PRRs) sensing pathogen-associated molecular patterns (PAMPs).
  • Tripartite motif (TRIM) proteins regulate these immune signaling pathways through ubiquitin modifications.
  • The role of specific TRIM proteins, like TRIM59, in Toll-like receptor (TLR) signaling requires further elucidation.

Purpose of the Study:

  • To investigate the function of TRIM59 in innate immune signaling pathways.
  • To identify interacting partners of TRIM59 in the TLR-mediated transduction pathway.
  • To determine the effect of TRIM59 on the transcriptional activity of NF-κB and interferon regulatory factors (IRFs).

Main Methods:

  • Co-immunoprecipitation to identify TRIM59 interacting proteins.
  • Luciferase reporter assays to measure transcriptional activity of NF-κB, IFN-β promoter, and ISRE.
  • Western blotting to assess the phosphorylation and dimerization status of IRF3 and IRF7.

Main Results:

  • TRIM59 was identified to interact with ECSIT, an adaptor protein crucial for TLR signaling.
  • Overexpression of TRIM59 repressed NF-κB, IFN-β, and ISRE transcriptional activities.
  • Knockdown of TRIM59 enhanced these transcriptional activities, indicating a negative regulatory role.
  • TRIM59 inhibited the phosphorylation and dimerization of IRF3 and IRF7, key transcription factors.

Conclusions:

  • TRIM59 acts as a negative regulator in innate immune signaling pathways.
  • TRIM59's interaction with ECSIT is important for its function in TLR-mediated signal transduction.
  • TRIM59's inhibitory effect on IRF activation suggests a role in modulating the early stages of innate immune responses.

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