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Related Experiment Videos

NEMO trimerizes through its coiled-coil C-terminal domain.

Fabrice Agou1, Fei Ye, Stéphane Goffinont

  • 1Unité de Régulation Enzymatique des Activités Cellulaires, Paris Cedex 15, France. fagou@pasteur.fr

The Journal of Biological Chemistry
|March 6, 2002
PubMed
Summary

NEMO, a regulatory component of the IKK complex, exists as a monomer but can form dimers and trimers. Its trimerization, potentially upon activator binding, is key to IKK complex activation.

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Area of Science:

  • Molecular Biology
  • Protein Biochemistry

Background:

  • NEMO (NF-kappaB Essential Modulator) is the regulatory subunit of the IKK complex, crucial for IKKalpha and IKKbeta kinase activity.
  • Understanding NEMO's self-assembly and interaction with chaperones is vital for elucidating IKK complex activation mechanisms.

Purpose of the Study:

  • To investigate the self-assembly properties of NEMO (IKK gamma).
  • To understand the mechanism of IKK complex activation through NEMO's behavior.

Main Methods:

  • Purification of wild-type and mutant NEMO from E. coli.
  • Analysis of recombinant NEMO (rNEMO) folding using fluorescence and far-UV CD spectroscopy.
  • In vivo cross-linking experiments to study native NEMO oligomerization.
  • Examination of NEMO interactions with Hsp70 chaperones.

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Main Results:

  • Recombinant NEMO is a correctly folded monomer that specifically binds the IKK complex.
  • NEMO forms a supramolecular structure with Hsp70, suggesting an assembly intermediate.
  • Native NEMO exists in equilibrium between dimeric and trimeric forms when associated with IKK.
  • A NEMO mutant lacking the N-terminal IKK binding domain forms a stable trimer, indicating this domain's role in preventing aggregation.

Conclusions:

  • NEMO self-assembly into trimers is a critical step in IKK complex activation.
  • Binding to IKK or Hsp70 may prevent aberrant NEMO oligomerization.
  • A model is proposed where NEMO trimerization upon upstream activator binding triggers IKK complex activation.