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The E3 ubiquitin ligase mind bomb-2 (MIB2) protein controls B-cell CLL/lymphoma 10 (BCL10)-dependent NF-κB activation

Cinthia C Stempin1, Liying Chi, Juan P Giraldo-Vela

  • 1Department of Infectious Diseases, St. Jude Children’s Research Hospital, Memphis, Tennessee 38105, USA.

The Journal of Biological Chemistry
|September 8, 2011
PubMed

Insights

The E3 ligase MIB2 is a newly discovered component of the BCL10 signaling complex. MIB2 is essential for BCL10-mediated activation of NF-κB by regulating key downstream signaling molecules.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • B-cell CLL/lymphoma 10 (BCL10) is vital for NF-κB activation in immune receptor signaling.
  • The precise mechanisms linking BCL10 to downstream kinases like TAK1 and IKK remain unclear.

Purpose of the Study:

  • To identify novel components of the activated BCL10 complex.
  • To elucidate the role of these components in NF-κB signaling.

Main Methods:

  • Proteomic analysis to identify interacting proteins.
  • In vitro translation and pulldown assays to confirm interactions.
  • Overexpression and knockdown experiments to assess functional roles.

Main Results:

  • The E3 ligase MIB2 was identified as a novel component of the activated BCL10 complex.
  • Direct interaction between BCL10 and MIB2 was confirmed.
  • MIB2 promotes BCL10-mediated NF-κB activation by facilitating autoubiquitination of IKKγ/NEMO and TAK1 recruitment/activation.
  • MIB2 knockdown inhibited BCL10-dependent NF-κB activation.

Conclusions:

  • MIB2 is a novel, essential component of the activated BCL10 signaling complex.
  • MIB2 acts as a missing link in the BCL10-dependent NF-κB signaling pathway, regulating downstream kinase activation.

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