1BY4

STRUCTURE AND MECHANISM OF THE HOMODIMERIC ASSEMBLY OF THE RXR ON DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.234 

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


Literature

Structural basis of RXR-DNA interactions.

Zhao, Q., Chasse, S.A., Devarakonda, S., Sierk, M.L., Ahvazi, B., Rastinejad, F.

(2000) J Mol Biol 296: 509-520

  • DOI: 10.1006/jmbi.1999.3457
  • Primary Citation of Related Structures:  
    1BY4

  • PubMed Abstract: 

    • The 9-cis retinoic acid receptor, RXR, binds DNA effectively as a homodimer or as a heterodimer with other nuclear receptors. The DNA-binding sites for these RXR complexes are direct repeats of a consensus sequence separated by one to five base-pairs of intervening space ...

    The 9-cis retinoic acid receptor, RXR, binds DNA effectively as a homodimer or as a heterodimer with other nuclear receptors. The DNA-binding sites for these RXR complexes are direct repeats of a consensus sequence separated by one to five base-pairs of intervening space. Here, we report the 2.1 A crystal structure of the RXR-DNA-binding domain as a homodimer in complex with its idealized direct repeat DNA target. The structure shows how a gene-regulatory site can induce conformational changes in a transcription factor that promote homo-cooperative assembly. Specifically, an alpha-helix in the T-box is disrupted to allow efficient DNA-binding and subunit dimerization. RXR displays a relaxed mode of sequence recognition, interacting with only three base-pairs in each hexameric half-site. The structure illustrates how site selection is achieved in this large eukaryotic transcription factor family through discrete protein-protein interactions and the use of tandem DNA binding sites with characteristic spacings.

    Organizational Affiliation: 

    Department of Pharmacology X-ray Crystallography Laboratory, University of Virginia, Charlottesville, VA, 22908, USA.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (RETINOIC ACID RECEPTOR RXR-ALPHA)E [auth A],
F [auth B],
G [auth C],
H [auth D]		82Homo sapiensMutation(s): 0 
Gene Names: RXRA, NR2B1
UniProt & NIH Common Fund Data Resources
Find proteins for P19793 (Homo sapiens)
Explore P19793 
Go to UniProtKB:  P19793
PHAROS:  P19793
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP19793
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA (5'-D(*C*TP*AP*GP*GP*TP*CP*AP*AP*AP*GP*GP*TP*CP*AP*G)-3')A [auth E],
C [auth G]		16N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*CP*TP*GP*AP*CP*CP*TP*TP*TP*GP*AP*CP*CP*TP*A)-3')B [auth F],
D [auth H]		15N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
DNA PDBBind:  1BY4 Kd: 350 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.234 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.93α = 90
b = 33.65β = 89.95
c = 101.4γ = 90
Software Package:
Software NamePurpose
AMoREphasing
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-01-12
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance