1BFS

STRUCTURE OF NF-KB P50 HOMODIMER BOUND TO A KB SITE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The role of DNA in the mechanism of NFkappaB dimer formation: crystal structures of the dimerization domains of the p50 and p65 subunits.

Huang, D.B.Huxford, T.Chen, Y.Q.Ghosh, G.

(1997) Structure 5: 1427-1436

  • DOI: https://doi.org/10.1016/s0969-2126(97)00293-1
  • Primary Citation of Related Structures:  
    1BFS, 1BFT

  • PubMed Abstract: 

    Members of the rel/NFkappaB family of transcription factors play a vital role in the regulation of rapid cellular responses, such as those required to fight infection or react to cellular stress. Members of this family of proteins form homo- and heterodimers with differing affinities for dimerization. They share a structural motif known as the rel homology region (RHR), the C-terminal one third of which mediates protein dimerization. Crystal structures of the rel/NFkappaB family members p50 and p65 in their DNA-bound homodimeric form have been solved. These structures showed that the residues from the dimerization domains of both p50 and p65 participate in DNA binding and that the DNA-protein and protein dimerization surfaces form one continuous overlapping interface. We desired to investigate the contribution of DNA to NFkappaB dimerization and to identify the mechanism for the selective association of rel/NFkappaB family peptides into transcriptionally active dimers. We report here the crystal structures of the dimerization domains of murine p50 and p65 at 2.2 A and 2.0 A resolution, respectively. A comparison of these two structures suggests that conservative amino acid changes at three positions are responsible for the differences in their dimer interfaces. The presence of the target DNA does not change the dimer interface of either protein in any significant manner. These two structures suggest that the rel/NFkappaB family of transcription factors use only a few conservative changes in their amino acid sequences to form a host of dimers with varying affinities for dimerization. Amino acids at positions corresponding to 254, 267, and 307 of murine p50, function as primary determinants for the observed differences in dimerization affinity. The DNA-contacting charged amino acid sidechains from the dimerization domains are held in a similar conformation in both the DNA-bound and free states, therefore, no major structural rearrangement is required to bring these residues into contact with the DNA.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0359, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NUCLEAR FACTOR NF-KAPPA-B P50106Mus musculusMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P25799 (Mus musculus)
Explore P25799 
Go to UniProtKB:  P25799
IMPC:  MGI:97312
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP25799
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.33α = 90
b = 62.33β = 90
c = 65.74γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-01-28
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-07
    Changes: Data collection, Database references, Other