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Updated: Aug 18, 2026

Methods for the Modulation and Analysis of NF-κB-dependent Adult Neurogenesis
Published on: February 13, 2014
Common structural constituents confer I kappa B activity to NF-kappa B p105 and I kappa B/MAD-3
E N Hatada1, M Naumann, C Scheidereit
1Max-Planck-Institut für Molekulare Genetik, Otto-Warburg-Laboratorium, Berline (Dahlem), Germany.
Abstract:
The vertebrate NF-kappa B/c-rel inhibitors MAD-3/I kappa B alpha, I kappa B gamma/pdI and bcl-3 all share a conserved ankyrin repeat domain (ARD) consisting of six complete repeats, a short acidic motif and/or an incomplete seventh repeat. We present here a detailed analysis of the domain in p105/pdI and MAD-3/I kappa B involved in inhibition of DNA binding and in protein interaction with rel factors. We demonstrate that in both cases an acidic region and six ankyrin-like repeats are sufficient and required for protein interaction with the rel factors. However, for p105/pdI to achieve the high affinity needed to suppress DNA binding, an incomplete seventh repeat is required in addition. Both pdI and MAD-3 associate with rel proteins by forming heterotrimeric complexes, as shown by native gel analysis and by cross-linking. Furthermore, we demonstrate that deletion of only three amino acids in the first repeat converts the subunit specificity of the p105 ARD into that of MAD-3/I kappa B. We conclude that functionally the ARD in these molecules has a modular structure, with different subregions determining the specificity for the NF-kappa B subunits p50 and p65.
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