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Related Experiment Videos

NF-kappaB RelB forms an intertwined homodimer.

De-Bin Huang1, Don Vu, Gourisankar Ghosh

  • 1Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.

Structure (London, England : 1993)
|September 13, 2005
PubMed
Summary

The RelB dimerization domain (DD) forms an unusual intertwined structure, unlike other NF-kappaB dimers. This unique fold stabilizes the RelB homodimer, potentially regulating its interactions with other proteins.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Nuclear factor kappa B (NF-kappaB) signaling pathways regulate gene expression crucial for immunity and inflammation.
  • NF-kappaB dimers typically form through the association of two independently folded immunoglobulin (Ig) domains.

Purpose of the Study:

  • To elucidate the structural basis of the RelB dimerization domain (DD) fold.
  • To investigate the stability and biological relevance of the RelB homodimer structure.

Main Methods:

  • X-ray crystallography to determine the three-dimensional structure of the RelB dimerization domain.
  • Biochemical assays to confirm the formation of the intertwined homodimer in solution.

Main Results:

Related Experiment Videos

  • The RelB dimerization domain adopts an unexpected intertwined fold topology, distinct from other NF-kappaB dimers.
  • Two polypeptides reconstruct both Ig domains in the dimer, with an additional beta sheet connecting them.
  • The RelB homodimer is stable in solution, suggesting a role in regulating protein interactions.

Conclusions:

  • The intertwined fold of the RelB dimerization domain provides stability to the homodimer.
  • This stabilization may prevent rapid degradation, facilitating heterodimer formation with p50 and p52.
  • The unique structure of RelB DD is critical for its function in NF-kappaB signaling.