Crystal structure of the human androgen receptor T877A mutant ligand-binding domain with cyproterone acetate

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.253 

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Crystal structure of the T877A human androgen receptor ligand-binding domain complexed to cyproterone acetate provides insight for ligand-induced conformational changes and structure-based drug design.

Bohl, C.E.Wu, Z.Miller, D.D.Bell, C.E.Dalton, J.T.

(2007) J Biol Chem 282: 13648-13655

  • DOI: https://doi.org/10.1074/jbc.M611711200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cyproterone acetate (CPA) is a steroidal antiandrogen used clinically in the treatment of prostate cancer. Compared with steroidal agonists for the androgen receptor (AR) (e.g. dihydrotestosterone, R1881), CPA is bulkier in structure and therefore seemingly incompatible with the binding pockets observed in currently available x-ray crystal structures of the AR ligand-binding domain (LBD). We solved the x-ray crystal structure of the human AR LBD bound to CPA at 1.8A in the T877A variant, a mutation known to increase the agonist activity of CPA and therefore facilitate purification and crystal formation of the receptor.drug complex. The structure demonstrates that bulk from the 17alpha-acetate group of CPA induces movement of the Leu-701 side chain, which results in partial unfolding of the C-terminal end of helix 11 and displacement of the loop between helices 11 and 12 in comparison to all other AR LBD crystal structures published to date. This structural alteration leads to an expansion of the AR binding cavity to include an additional pocket bordered by Leu-701, Leu-704, Ser-778, Met-780, Phe-876, and Leu-880. Further, we found that CPA invokes transcriptional activation in the L701A AR at low nanomolar concentrations similar to the T877A mutant. Analogous mutations in the glucocorticoid receptor (GR) and progesterone receptor were constructed, and we found that CPA was also converted into a potent agonist in the M560A GR. Altogether, these data offer information for structure-based drug design, elucidate flexible regions of the AR LBD, and provide insight as to how CPA antagonizes the AR and GR.

  • Organizational Affiliation

    Division of Pharmaceutics, College of Pharmacy, Ohio State University, Columbus, Ohio 43210, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Androgen receptor249Homo sapiensMutation(s): 1 
Gene Names: ARDHTRNR3C4
UniProt & NIH Common Fund Data Resources
Find proteins for P10275 (Homo sapiens)
Explore P10275 
Go to UniProtKB:  P10275
PHAROS:  P10275
GTEx:  ENSG00000169083 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10275
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CA4

Download Ideal Coordinates CCD File 
C24 H29 Cl O4
Binding Affinity Annotations 
IDSourceBinding Affinity
CA4 BindingDB:  2OZ7 Ki: 14 (nM) from 1 assay(s)
IC50: min: 23, max: 1.80e+4 (nM) from 3 assay(s)
PDBBind:  2OZ7 Ki: 14 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.253 
  • R-Value Observed: 0.253 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.504α = 90
b = 65.82β = 90
c = 71.506γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
CrystalCleardata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-03-27
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-30
    Changes: Data collection, Refinement description