Abstract
The R,R enantiomer of 5,11-cis-diethyl-5,6,11,12-tetrahydrochrysene-2,8-diol (THC) exerts opposite effects on the transcriptional activity of the two estrogen receptor (ER) subtypes, ERα and ERβ. THC acts as an ERα agonist and as an ERβ antagonist. We have determined the crystal structures of the ERα ligand binding domain (LBD) bound to both THC and a fragment of the transcriptional coactivator GRIP1, and the ERβ LBD bound to THC. THC stabilizes a conformation of the ERα LBD that permits coactivator association and a conformation of the ERβ LBD that prevents coactivator association. A comparison of the two structures, taken together with functional data, reveals that THC does not act on ERβ through the same mechanisms used by other known ER antagonists. Instead, THC antagonizes ERβ through a novel mechanism we term 'passive antagonism'.
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Acknowledgements
We thank T. Earnest for advice and assistance at beamline 5.0.2 (ALS is funded by the US Department of Energy Office of Basic Energy Sciences). We also thank M. Butte, N. Ota and Y. Shibata for assistance with data collection; P. Coward, A. Derman, and Y. Li for comments on the manuscript; and H. Deacon for extensive graphical assistance. This work was supported by the NIH (B.S.K, J.A.K. and D.A.A), the Howard Hughes Medical Institute (D.A.A.), the Susan G. Komen Breast Cancer Foundation (G.L.G.), the USAMRMC (G.L.G.) and the Illinois Department of Public Health (G.L.G). In the initial phases of this work, A.K.S. was supported by a Howard Hughes Medical Institute Predoctoral Fellowship and a UCSF Chancellor's Fellowship. All crystallographic studies were completed while A.K.S. was at UCSF, and the peptide binding studies were performed by A.K.S. at Tularik Inc.
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With the exception of A.K.S., all of the authors declare that they have no competing financial interests. A.K.S. declares that he is an employee of a commercial biopharmaceutical company that carries out research in the nuclear receptor field and that, as part of his employment, he receives options to purchase company stock.
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Shiau, A., Barstad, D., Radek, J. et al. Structural characterization of a subtype-selective ligand reveals a novel mode of estrogen receptor antagonism. Nat Struct Mol Biol 9, 359–364 (2002). https://doi.org/10.1038/nsb787
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DOI: https://doi.org/10.1038/nsb787