3D24

Crystal structure of ligand-binding domain of estrogen-related receptor alpha (ERRalpha) in complex with the peroxisome proliferators-activated receptor coactivator-1alpha box3 peptide (PGC-1alpha)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.11 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Communication between the ERR{alpha} Homodimer Interface and the PGC-1{alpha} Binding Surface via the Helix 8-9 Loop.

Greschik, H.Althage, M.Flaig, R.Sato, Y.Chavant, V.Peluso-Iltis, C.Choulier, L.Cronet, P.Rochel, N.Schule, R.Stromstedt, P.E.Moras, D.

(2008) J.Biol.Chem. 283: 20220-20230

  • DOI: 10.1074/jbc.M801920200

  • PubMed Abstract: 
  • Although structural studies on the ligand-binding domain (LBD) have established the general mode of nuclear receptor (NR)/coactivator interaction, determinants of binding specificity are only partially understood. The LBD of estrogen receptor-alpha ( ...

    Although structural studies on the ligand-binding domain (LBD) have established the general mode of nuclear receptor (NR)/coactivator interaction, determinants of binding specificity are only partially understood. The LBD of estrogen receptor-alpha (ERalpha), for example, interacts only with a region of peroxisome proliferator-activated receptor coactivator (PGC)-1alpha, which contains the canonical LXXLL motif (NR box2), whereas the LBD of estrogen-related receptor-alpha (ERRalpha) also binds efficiently an untypical, LXXYL-containing region (NR box3) of PGC-1alpha. Surprisingly, in a previous structural study, the ERalpha LBD has been observed to bind NR box3 of transcriptional intermediary factor (TIF)-2 untypically via LXXYL, whereas the ERRalpha LBD binds this region of TIF-2 only poorly. Here we present a new crystal structure of the ERRalpha LBD in complex with a PGC-1alpha box3 peptide. In this structure, residues N-terminal of the PGC-1alpha LXXYL motif formed contacts with helix 4, the loop connecting helices 8 and 9, and with the C terminus of the ERRalpha LBD. Interaction studies using wild-type and mutant PGC-1alpha and ERRalpha showed that these contacts are functionally relevant and are required for efficient ERRalpha/PGC-1alpha interaction. Furthermore, a structure comparison between ERRalpha and ERalpha and mutation analyses provided evidence that the helix 8-9 loop, which differs significantly in both nuclear receptors, is a major determinant of coactivator binding specificity. Finally, our results revealed that in ERRalpha the helix 8-9 loop allosterically links the LBD homodimer interface with the coactivator cleft, thus providing a plausible explanation for distinct PGC-1alpha binding to ERRalpha monomers and homodimers.


    Organizational Affiliation

    Département de Biologie et Génomique Structurales, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Steroid hormone receptor ERR1
A, C
253Homo sapiensMutation(s): 0 
Gene Names: ESRRA (ERR1, ESRL1, NR3B1)
Find proteins for P11474 (Homo sapiens)
Go to Gene View: ESRRA
Go to UniProtKB:  P11474
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Peroxisome proliferator-activated receptor gamma coactivator 1-alpha
B, D
22Homo sapiensMutation(s): 0 
Gene Names: PPARGC1A (LEM6, PGC1, PGC1A, PPARGC1)
Find proteins for Q9UBK2 (Homo sapiens)
Go to Gene View: PPARGC1A
Go to UniProtKB:  Q9UBK2
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.11 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.212 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 119.400α = 90.00
b = 56.000β = 106.40
c = 96.200γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
AMoREphasing
HKL-2000data collection
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-06-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance