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A20 is a negative regulator of BCL10- and CARMA3-mediated activation of NF-kappaB

Romania Stilo1, Ettore Varricchio, Domenico Liguoro

  • 1Dip. Scienze Biologiche ed Ambientali, Università degli Studi del Sannio di Benevento, Via Port'Arsa 11, 82100 Benevento, Italy.

Journal of Cell Science
|March 20, 2008
PubMed

Insights

The inducible protein A20 regulates nuclear factor kappaB (NF-kappaB) activation by disrupting the CARMA/BCL10/TRAF6 complex. This deubiquitylation activity suppresses NF-kappaB signaling in various cell types.

Area of Science:

  • Molecular Biology
  • Immunology
  • Cell Signaling

Background:

  • The CARMA, BCL10, and TRAF6 complex is crucial for nuclear factor kappaB (NF-kappaB) transcription factor activation.
  • NF-kappaB plays a vital role in immune responses and cellular processes.

Purpose of the Study:

  • To investigate the regulatory role of the inducible protein A20 in NF-kappaB signaling pathways.
  • To elucidate the molecular mechanisms by which A20 controls the CARMA/BCL10 complex activity.

Main Methods:

  • Investigated protein interactions and signaling cascades.
  • Utilized biochemical assays to assess deubiquitylation activity.
  • Examined the impact of A20 on NF-kappaB activation in lymphoid and non-lymphoid cells.

Main Results:

  • A20 negatively regulates NF-kappaB signaling through its deubiquitylation activity.
  • A20 perturbs the assembly of the CARMA3, BCL10, and IKKgamma/NEMO complex.
  • A20 suppresses NF-kappaB activation by interfering with complex formation.

Conclusions:

  • A20 acts as a negative regulator of NF-kappaB signaling by targeting the CARMA/BCL10 complex.
  • A20's deubiquitylation activity is essential for controlling NF-kappaB activation.
  • The findings reveal a novel function for A20 in regulating CARMA and BCL10 activity in immune and non-immune cells.

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