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Characterization of Agonist Binding to His524 in the Estrogen Receptor α Ligand Binding Domain

Journal article
Authors L. Gao
Y. Tu
H. Ågren
Leif A Eriksson
Published in Journal of Physical Chemistry B
Volume 116
Issue 16
Pages 4823-4830
ISSN 1520-6106
Publication year 2012
Published at Department of Chemistry and Molecular Biology
Pages 4823-4830
Language en
Subject categories Biophysical chemistry, Theoretical Chemistry, Chemical Sciences, Physical Chemistry


The bioactivities of the natural steroidal estrogen 17β-estradiol (E2), the synthetic estrogen diethylstilbestrol (DES), and the phytoestrogen genistein (GEN) are intimately associated with their binding to the estrogen receptor α ligand binding domain (ERα LBD) and accordingly allostery. Molecular modeling techniques have been performed on agonists in complex with the LBD, focusing on the pivotal role of His524 modeled as the ε-tautomer and the protonated form (depending on pH). It is found that E2 binds to the active LBD with the aid of Leu525, showing existing stable patterns of an H-binding network with Glu419 via His524 in all models. The main difference seen in the effect is that the full agonists E2 and DES have higher binding energies to the protonated His524 than the partial agonists GEN and Way-169916 (W), which is in line with noted experimental transcriptional activities. In conclusion, the study demonstrates that the phytoestrogen GEN interacts differently with the LBD than what E2 and DES do, which explains the observed signaling differences.

Page Manager: Webmaster|Last update: 9/11/2012

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