1IKN

IKAPPABALPHA/NF-KAPPAB COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.223 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The crystal structure of the IkappaBalpha/NF-kappaB complex reveals mechanisms of NF-kappaB inactivation.

Huxford, T.Huang, D.B.Malek, S.Ghosh, G.

(1998) Cell 95: 759-770

  • DOI: 10.1016/s0092-8674(00)81699-2
  • Primary Citation of Related Structures:  
    1IKN

  • PubMed Abstract: 
  • IkappaBalpha regulates the transcription factor NF-kappaB through the formation of stable IkappaBalpha/NF-kappaB complexes. Prior to induction, IkappaBalpha retains NF-kappaB in the cytoplasm until the NF-kappaB activation signal is received. After activation, NF-kappaB is removed from gene promoters through association with nuclear IkappaBalpha, restoring the preinduction state ...

    IkappaBalpha regulates the transcription factor NF-kappaB through the formation of stable IkappaBalpha/NF-kappaB complexes. Prior to induction, IkappaBalpha retains NF-kappaB in the cytoplasm until the NF-kappaB activation signal is received. After activation, NF-kappaB is removed from gene promoters through association with nuclear IkappaBalpha, restoring the preinduction state. The 2.3 A crystal structure of IkappaBalpha in complex with the NF-kappaB p50/p65 heterodimer reveals mechanisms of these inhibitory activities. The presence of IkappaBalpha allows large en bloc movement of the NF-kappaB p65 subunit amino-terminal domain. This conformational change induces allosteric inhibition of NF-kappaB DNA binding. Amino acid residues immediately preceding the nuclear localization signals of both NF-kappaB p50 and p65 subunits are tethered to the IkappaBalpha amino-terminal ankyrin repeats, impeding NF-kappaB from nuclear import machinery recognition.


    Organizational Affiliation

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



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (NF-KAPPA-B P65 SUBUNIT)A286Mus musculusMutation(s): 0 
Gene Names: RelaNfkb3
UniProt
Find proteins for Q04207 (Mus musculus)
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Go to UniProtKB:  Q04207
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (NF-KAPPA-B P50D SUBUNIT)B [auth C]119Mus musculusMutation(s): 0 
Gene Names: Nfkb1
UniProt & NIH Common Fund Data Resources
Find proteins for P25799 (Mus musculus)
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Go to UniProtKB:  P25799
IMPC:  MGI:97312
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (I-KAPPA-B-ALPHA)C [auth D]236Homo sapiensMutation(s): 0 
Gene Names: MAD-3NFKBIAIKBAMAD3NFKBI
UniProt & NIH Common Fund Data Resources
Find proteins for P25963 (Homo sapiens)
Explore P25963 
Go to UniProtKB:  P25963
PHAROS:  P25963
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.223 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 124.5α = 90
b = 49.3β = 108.7
c = 120.6γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-04-12
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance