4OAR

Progesterone receptor with bound ulipristal acetate and a peptide from the co-repressor SMRT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.41 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Molecular determinants of the recognition of ulipristal acetate by oxo-steroid receptors.

Petit-Topin, I.Fay, M.Resche-Rigon, M.Ulmann, A.Gainer, E.Rafestin-Oblin, M.E.Fagart, J.

(2014) J.Steroid Biochem.Mol.Biol. 144PB: 427-435

  • DOI: 10.1016/j.jsbmb.2014.08.008

  • PubMed Abstract: 
  • The human progesterone receptor (PR) plays a key role in reproductive function in women. PR antagonists have numerous applications in female health care including regular and emergency contraception, and treatment of hormone-related pathological cond ...

    The human progesterone receptor (PR) plays a key role in reproductive function in women. PR antagonists have numerous applications in female health care including regular and emergency contraception, and treatment of hormone-related pathological conditions such as breast cancer, endometriosis, and leiomyoma. The main factor limiting their long-term administration is the fact that they cross-bind to other oxo-steroid receptors. Ulipristal acetate (UPA), a highly potent PR antagonist, has recently come onto the market and is much more selective for PR than the other oxo-steroid receptors (androgen, AR, glucocorticoid, GR, and mineralocorticoid, MR receptors) and, remarkably, it displays lower GR-inactivating potency than RU486. We adopted a structural approach to characterizing the binding of UPA to the oxo-steroid receptors at the molecular level. We solved the X-ray crystal structure of the ligand-binding domain (LBD) of the human PR complexed with UPA and a peptide from the transcriptional corepressor SMRT. We used the X-ray crystal structure of the GR in its antagonist conformation to dock UPA within its ligand-binding cavity. Finally, we generated three-dimensional models of the LBD of androgen and mineralocorticoid receptors (AR and MR) in an antagonist conformation and docked UPA within them. Comparing the structures revealed that the network of stabilizing contacts between the UPA C11 aryl group and the LBD is responsible for its high PR antagonist potency. It also showed that it is the inability of UPA to contact Gln642 in GR that explains why it has lower potency in inactivating GR than RU486. Finally, we found that the binding pockets of AR and MR are too small to accommodate UPA, and allowed us to propose that the extremely low sensitivity of MR to UPA is due to inappropriate interactions with the C11 substituent. All these findings open new avenues for designing new PR antagonist compounds displaying greater selectivity.


    Organizational Affiliation

    Inserm U773, Centre de Recherche Biomédicale Bichat-Beaujon CRB3, Paris, France; Université Denis Diderot, Site Bichat, Paris, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Progesterone receptor
A
258Homo sapiensMutation(s): 0 
Gene Names: PGR (NR3C3)
Find proteins for P06401 (Homo sapiens)
Go to Gene View: PGR
Go to UniProtKB:  P06401
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Peptide from Nuclear receptor corepressor 2
B
17Homo sapiensMutation(s): 0 
Gene Names: NCOR2 (CTG26)
Find proteins for Q9Y618 (Homo sapiens)
Go to Gene View: NCOR2
Go to UniProtKB:  Q9Y618
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
2S0
Query on 2S0

Download SDF File 
Download CCD File 
A
[(8S,11R,13S,14S,17R)-17-acetyl-11-[4-(dimethylamino)phenyl]-13-methyl-3-oxo-1,2,6,7,8,11,12,14,15,16-decahydrocyclopenta[a]phenanthren-17-yl] acetate
ulipristal acetate
C30 H37 N O4
OOLLAFOLCSJHRE-ZHAKMVSLSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
2S0IC50: 0.2 nM (100) BINDINGDB
2S0EC50: >100 nM (100) BINDINGDB
2S0IC50: 0.038 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.41 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.211 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 87.180α = 90.00
b = 87.180β = 90.00
c = 90.910γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
PHASERphasing
XSCALEdata scaling
MxCuBEdata collection
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-08
    Type: Initial release