4NQA

Crystal structure of liganded hRXR-alpha/hLXR-beta heterodimer on DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.186 

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Literature

Structure of the retinoid X receptor alpha-liver X receptor beta (RXR alpha-LXR beta ) heterodimer on DNA.

Lou, X., Toresson, G., Benod, C., Suh, J.H., Philips, K.J., Webb, P., Gustafsson, J.A.

(2014) Nat Struct Mol Biol 21: 277-281

  • DOI: 10.1038/nsmb.2778
  • Primary Citation of Related Structures:  
    4NQA

  • PubMed Abstract: 

    • Nuclear receptors (NRs) are conditional transcription factors with common multidomain organization that bind diverse DNA elements. How DNA sequences influence NR conformation is poorly understood. Here we report the crystal structure of the human retinoid X receptor α-liver X receptor β (RXRα-LXRβ) heterodimer on its cognate element, an AGGTCA direct repeat spaced by 4 nt ...

    Nuclear receptors (NRs) are conditional transcription factors with common multidomain organization that bind diverse DNA elements. How DNA sequences influence NR conformation is poorly understood. Here we report the crystal structure of the human retinoid X receptor α-liver X receptor β (RXRα-LXRβ) heterodimer on its cognate element, an AGGTCA direct repeat spaced by 4 nt. The complex has an extended X-shaped arrangement, with DNA- and ligand-binding domains crossed, in contrast to the parallel domain arrangement of other NRs that bind an AGGTCA direct repeat spaced by 1 nt. The LXRβ core binds DNA via canonical contacts and auxiliary DNA contacts that enhance affinity for the response element. Comparisons of RXRα-LXRβs in the crystal asymmetric unit and with previous NR structures reveal flexibility in NR organization and suggest a role for RXRα in adaptation of heterodimeric complexes to DNA.

    Organizational Affiliation: 

    1] Center for Nuclear Receptors and Cell Signaling, University of Houston, Houston, Texas, USA. [2] Genomic Medicine Program, Houston Methodist Research Institute, Houston, Texas, USA. [3] Department of Biosciences, Karolinska Institutet, Novum, Huddinge, Sweden.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Retinoic acid receptor RXR-alphaA,
G [auth H]		365Homo sapiensMutation(s): 0 
Gene Names: RXRA, NR2B1
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Find proteins for P19793 (Homo sapiens)
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Go to UniProtKB:  P19793
PHAROS:  P19793
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UniProt GroupP19793
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Liver X nuclear receptor betaB,
H [auth I]		391Homo sapiensMutation(s): 0 
Gene Names: NR1H2, hCG_22944, LXRB, NER, UNR
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Find proteins for P55055 (Homo sapiens)
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PHAROS:  P55055
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UniProt GroupP55055
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Nuclear receptor coactivator 2C,
D,
I [auth J],
J [auth K]		13Homo sapiensMutation(s): 0 
Gene Names: NCOA2, BHLHE75, TIF2, SRC2
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Find proteins for Q15596 (Homo sapiens)
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Go to UniProtKB:  Q15596
PHAROS:  Q15596
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UniProt GroupQ15596
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Entity ID: 4
MoleculeChainsLengthOrganismImage
5'-D(*TP*AP*AP*GP*GP*TP*CP*AP*CP*TP*TP*CP*AP*GP*GP*TP*CP*A)-3'E,
K [auth L]		18synthetic construct
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Entity ID: 5
MoleculeChainsLengthOrganismImage
5'-D(*TP*AP*TP*GP*AP*CP*CP*TP*GP*AP*AP*GP*TP*GP*AP*CP*CP*T)-3'F,
L [auth M]		18synthetic construct
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  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
965 BindingDB:  4NQA Ki: 2.2 (nM) from 1 assay(s)
IC50: min: 7.9, max: 40 (nM) from 5 assay(s)
EC50: min: 5, max: 501 (nM) from 15 assay(s)
9CR BindingDB:  4NQA Ki: min: 8, max: 583 (nM) from 5 assay(s)
Kd: min: 1.5, max: 1810 (nM) from 11 assay(s)
IC50: min: 29, max: 82 (nM) from 3 assay(s)
EC50: min: 1.5, max: 1730 (nM) from 14 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.186 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.783α = 90
b = 85.783β = 90
c = 238.577γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-26
    Type: Initial release
  • Version 1.1: 2014-03-19
    Changes: Database references
  • Version 1.2: 2016-11-09
    Changes: Non-polymer description, Source and taxonomy