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Pellino 3b negatively regulates interleukin-1-induced TAK1-dependent NF kappaB activation

Hui Xiao1, Wen Qian, Kirk Staschke

  • 1Department of Immunology, Cleveland Clinic Foundation, Cleveland, OH 44195, USA.

The Journal of Biological Chemistry
|March 11, 2008
PubMed

Insights

Pellino 3b regulates interleukin-1 (IL-1) signaling by controlling IRAK degradation. This ubiquitin ligase promotes Lys-63 ubiquitination, blocking IRAK degradation and inhibiting IL-1 signaling pathways.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Interleukin-1 (IL-1) signaling is crucial in immune responses.
  • IL-1 receptor-associated kinase (IRAK) is a key mediator in IL-1 signaling.
  • IRAK undergoes phosphorylation, ubiquitination, and degradation upon IL-1 stimulation.

Purpose of the Study:

  • To investigate the role of Pellino 3b in IL-1 signaling.
  • To elucidate the mechanism by which Pellino 3b regulates IRAK.
  • To determine the impact of Pellino 3b on IL-1-induced TAK1 activation.

Main Methods:

  • Investigated IRAK ubiquitination upon IL-1 stimulation.
  • Identified Pellino 3b as a ubiquitin protein ligase for IRAK.
  • Analyzed the effect of Pellino 3b on IRAK degradation and TAK1 activation.

Main Results:

  • IRAK is ubiquitinated via Lys-48- and Lys-63-linked polyubiquitin chains upon IL-1 induction.
  • Pellino 3b specifically promotes Lys-63-linked polyubiquitination of IRAK at Lys-134.
  • Pellino 3b-mediated ubiquitination competes with Lys-48-linked ubiquitination, inhibiting IRAK degradation.
  • Pellino 3b inhibits IL-1-induced TAK1 activation, suggesting IRAK degradation is required for TAK1 activation.

Conclusions:

  • Pellino 3b acts as a negative regulator of IL-1 signaling.
  • Pellino 3b regulates IL-1 signaling by controlling IRAK degradation via its ubiquitin ligase activity.
  • The findings reveal a novel mechanism for modulating IL-1 pathway activation.

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