1R0O

Crystal Structure of the Heterodimeric Ecdysone Receptor DNA-binding Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.24 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.232 

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This is version 1.2 of the entry. See complete history


Literature

Structure of the Heterodimeric Ecdysone Receptor DNA-binding Complex

Devarakonda, S.Harp, J.M.Kim, Y.Ozyhar, A.Rastinejad, F.

(2003) EMBO J 22: 5827-5840

  • DOI: 10.1093/emboj/cdg569
  • Primary Citation of Related Structures:  
    1R0N, 1R0O

  • PubMed Abstract: 
  • Ecdysteroids initiate molting and metamorphosis in insects via a heterodimeric receptor consisting of the ecdysone receptor (EcR) and ultraspiracle (USP). The EcR-USP heterodimer preferentially mediates transcription through highly degenerate pseudo-palindromic response elements, resembling inverted repeats of 5'-AGGTCA-3' separated by 1 bp (IR-1) ...

    Ecdysteroids initiate molting and metamorphosis in insects via a heterodimeric receptor consisting of the ecdysone receptor (EcR) and ultraspiracle (USP). The EcR-USP heterodimer preferentially mediates transcription through highly degenerate pseudo-palindromic response elements, resembling inverted repeats of 5'-AGGTCA-3' separated by 1 bp (IR-1). The requirement for a heterodimeric arrangement of EcR-USP subunits to bind to a symmetric DNA is unusual within the nuclear receptor superfamily. We describe the 2.24 A structure of the EcR-USP DNA-binding domain (DBD) heterodimer bound to an idealized IR-1 element. EcR and USP use similar surfaces, and rely on the deformed minor groove of the DNA to establish protein-protein contacts. As retinoid X receptor (RXR) is the mammalian homolog of USP, we also solved the 2.60 A crystal structure of the EcR-RXR DBD heterodimer on IR-1 and found the dimerization and DNA-binding interfaces to be the same as in the EcR-USP complex. Sequence alignments indicate that the EcR-RXR heterodimer is an important model for understanding how the FXR-RXR heterodimer binds to IR-1 sites.


    Organizational Affiliation

    Department of Pharmacology, University of Virginia Health System, Charlottesville, VA 22908, USA.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Ultraspiracle proteinC [auth A]86Drosophila melanogasterMutation(s): 0 
Gene Names: uspCf1NR2B4CG4380
UniProt
Find proteins for P20153 (Drosophila melanogaster)
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Go to UniProtKB:  P20153
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UniProt GroupP20153
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Ecdysone receptorD [auth B]109Drosophila melanogasterMutation(s): 0 
Gene Names: EcRNR1H1CG1765
UniProt
Find proteins for P34021 (Drosophila melanogaster)
Explore P34021 
Go to UniProtKB:  P34021
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UniProt GroupP34021
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Entity ID: 1
MoleculeChainsLengthOrganismImage
Ecdysone Response ElementA [auth C]18N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
Ecdysone Response ElementB [auth D]18N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.24 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.232 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.37α = 90
b = 59.88β = 90
c = 113.77γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-10-21
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance