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Production, Crystallization, and Structure Determination of the IKK-binding Domain of NEMO
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p47 negatively regulates IKK activation by inducing the lysosomal degradation of polyubiquitinated NEMO

Yuri Shibata1, Masaaki Oyama, Hiroko Kozuka-Hata

  • 1Department of Cancer Biology, Division of Cellular and Molecular Biology, Institute of Medical Science, University of Tokyo, Minato-ku, Tokyo, Japan.

Nature Communications
|September 20, 2012
PubMed

Insights

p47 protein negatively regulates NF-κB pathway activation by targeting NEMO for degradation. This finding reveals a novel mechanism controlling inflammation and autoimmune diseases.

Area of Science:

  • Molecular Biology
  • Immunology
  • Cell Biology

Background:

  • Nuclear factor kappa B (NF-κB) pathway overactivation is implicated in inflammatory and autoimmune diseases.
  • The precise molecular mechanisms for negative regulation of NF-κB activation remain incompletely understood.

Purpose of the Study:

  • To elucidate the role of p47 protein in the negative regulation of NF-κB pathway activation.
  • To identify novel molecular mechanisms controlling IκB kinase (IKK) complex activity.

Main Methods:

  • Investigated the interaction of p47 with the IKK complex subunits upon stimulation with TNF-α or IL-1.
  • Analyzed the binding of p47 to ubiquitinated NEMO.
  • Examined the effect of p47 silencing on IKK activation and inflammatory gene expression.

Main Results:

  • p47 associates with NEMO, a subunit of the IKK complex, following TNF-α or IL-1 stimulation.
  • p47 binds to Lys63-linked and linear polyubiquitin chains on NEMO.
  • p47 binding induces lysosomal degradation of NEMO, inhibiting IKK activation.
  • Silencing p47 leads to heightened IKK activation and increased inflammatory gene expression.

Conclusions:

  • p47 acts as a critical negative regulator of stimulation-induced IKK activation.
  • p47's mechanism of action, involving NEMO degradation, is distinct from known negative regulators like A20 and CYLD.
  • p47 represents a potential therapeutic target for inflammatory and autoimmune conditions.

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