Download MendeleyStructural and biochemical analyses of the nuclear I kappa B zeta protein in complex with the NF-kappa B p50 homodimer.
Zhu, N., Rogers, W.E., Heidary, D.K., Huxford, T.(2024) Genes Dev 38: 528-535
- PubMed: 38960718
- DOI: https://doi.org/10.1101/gad.351892.124
- Primary Citation of Related Structures:
9BOR - PubMed Abstract:
As part of the efforts to understand nuclear IκB function in NF-κB-dependent gene expression, we report an X-ray crystal structure of the IκBζ ankyrin repeat domain in complex with the dimerization domain of the NF-κB p50 homodimer. IκBζ possesses an N-terminal α helix that conveys domain folding stability. Affinity and specificity of the complex depend on a small portion of p50 at the nuclear localization signal. The model suggests that only one p50 subunit supports binding with IκBζ, and biochemical experiments confirm that IκBζ associates with DNA-bound NF-κB p50:RelA heterodimers. Comparisons of IκBζ:p50 and p50:κB DNA complex crystallographic models indicate that structural rearrangement is necessary for ternary complex formation of IκBζ and p50 with DNA.
Organizational Affiliation:
Structural Biochemistry Laboratory, Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182, USA.
