1MY7

NF-kappaB p65 subunit dimerization domain homodimer N202R mutation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.49 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.233 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solvent exposed non-contacting amino acids play a critical role in NF-kappaB/IkappaB alpha complex formation

Huxford, T.Mishler, D.Phelps, C.B.Huang, D.-B.Sengchanthalangsy, L.L.Reeves, R.Hughes, C.A.Komives, E.A.Ghosh, G.

(2002) J.Mol.Biol. 324: 587-597

  • Primary Citation of Related Structures:  1MY5

  • PubMed Abstract: 
  • IkappaBalpha inhibits transcription factor NF-kappaB activity by specific binding to NF-kappaB heterodimers composed of p65 and p50 subunits. It binds with slightly lower affinity to p65 homodimers and with significantly lower affinity to homodimers ...

    IkappaBalpha inhibits transcription factor NF-kappaB activity by specific binding to NF-kappaB heterodimers composed of p65 and p50 subunits. It binds with slightly lower affinity to p65 homodimers and with significantly lower affinity to homodimers of p50. We have employed a structure-based mutagenesis approach coupled with protein-protein interaction assays to determine the source of this dimer selectivity exhibited by IkappaBalpha. Mutation of amino acid residues in IkappaBalpha that contact NF-kappaB only marginally affects complex binding affinity, indicating a lack of hot spots in NF-kappaB/IkappaBalpha complex formation. Conversion of the weak binding NF-kappaB p50 homodimer into a high affinity binding partner of IkappaBalpha requires transfer of both the NLS polypeptide and amino acid residues Asn202 and Ser203 from the NF-kappaB p65 subunit. Involvement of Asn202 and Ser203 in complex formation is surprising as these amino acid residues occupy solvent exposed positions at a distance of 20A from IkappaBalpha in the crystal structures. However, the same amino acid residue positions have been genetically isolated as determinants of binding specificity in a homologous system in Drosophila. X-ray crystallographic and solvent accessibility experiments suggest that these solvent-exposed amino acid residues contribute to NF-kappaB/IkappaBalpha complex formation by modulating the NF-kappaB p65 subunit NLS polypeptide.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NF-kappaB p65 (RelA) subunit
A, B
114Mus musculusGene Names: Rela (Nfkb3)
Find proteins for Q04207 (Mus musculus)
Go to UniProtKB:  Q04207
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.49 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.233 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 55.988α = 90.00
b = 75.072β = 90.00
c = 108.733γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
AMoREphasing
SCALEPACKdata scaling
HKL-2000data reduction
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-04
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance