1NFI

I-KAPPA-B-ALPHA/NF-KAPPA-B COMPLEX

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.223 

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This is version 1.2 of the entry. See complete history. 


Literature

Structure of an IkappaBalpha/NF-kappaB complex.

Jacobs, M.D., Harrison, S.C.

(1998) Cell 95: 749-758

  • DOI: 10.1016/s0092-8674(00)81698-0
  • Primary Citation of Related Structures:  
    1NFI

  • PubMed Abstract: 

    • The inhibitory protein, IkappaBalpha, sequesters the transcription factor, NF-kappaB, as an inactive complex in the cytoplasm. The structure of the IkappaBalpha ankyrin repeat domain, bound to a partially truncated NF-kappaB heterodimer (p50/ p65), has been determined by X-ray crystallography at 2 ...

    The inhibitory protein, IkappaBalpha, sequesters the transcription factor, NF-kappaB, as an inactive complex in the cytoplasm. The structure of the IkappaBalpha ankyrin repeat domain, bound to a partially truncated NF-kappaB heterodimer (p50/ p65), has been determined by X-ray crystallography at 2.7 A resolution. It shows a stack of six IkappaBalpha ankyrin repeats facing the C-terminal domains of the NF-kappaB Rel homology regions. Contacts occur in discontinuous patches, suggesting a combinatorial quality for ankyrin repeat specificity. The first two repeats cover an alpha helically ordered segment containing the p65 nuclear localization signal. The position of the sixth ankyrin repeat shows that full-length IkappaBalpha will occlude the NF-kappaB DNA-binding cleft. The orientation of IkappaBalpha in the complex places its N- and C-terminal regions in appropriate locations for their known regulatory functions.

    Organizational Affiliation: 

    Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NF-KAPPA-B P65A, C301Homo sapiensMutation(s): 0 
Gene Names: RELA, NFKB3
UniProt & NIH Common Fund Data Resources
Find proteins for Q04206 (Homo sapiens)
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Go to UniProtKB:  Q04206
PHAROS:  Q04206
GTEx:  ENSG00000173039 
Entity Groups  
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UniProt GroupQ04206
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
NF-KAPPA-B P50B, D107Homo sapiensMutation(s): 0 
Gene Names: NFKB1
UniProt & NIH Common Fund Data Resources
Find proteins for P19838 (Homo sapiens)
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Go to UniProtKB:  P19838
PHAROS:  P19838
GTEx:  ENSG00000109320 
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UniProt GroupP19838
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
I-KAPPA-B-ALPHAE, F213Homo sapiensMutation(s): 0 
Gene Names: NFKBIA, IKBA, MAD3, NFKBI
UniProt & NIH Common Fund Data Resources
Find proteins for P25963 (Homo sapiens)
Explore P25963 
Go to UniProtKB:  P25963
PHAROS:  P25963
GTEx:  ENSG00000100906 
Entity Groups  
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UniProt GroupP25963
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.223 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.094α = 90
b = 91.08β = 96.32
c = 190.98γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-11-18
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance