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Int. J. Environ. Res. Public Health 2008, 5(2), 111-114; doi:10.3390/ijerph5020111
Article

Preliminary Molecular Dynamic Simulations of the Estrogen Receptor Alpha Ligand Binding Domain from Antagonist to Apo

1, 1,*  and 2
Received: 29 October 2007; Accepted: 30 April 2008 / Published: 30 June 2008
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Abstract: Estrogen receptors (ER) are known as nuclear receptors. They exist in the cytoplasm of human cells and serves as a DNA binding transcription factor that regulates gene expression. However the estrogen receptor also has additional functions independent of DNA binding. The human estrogen receptor comes in two forms, alpha and beta. This work focuses on the alpha form of the estrogen receptor. The ERα is found in breast cancer cells, ovarian stroma cells, endometrium, and the hypothalamus. It has been suggested that exposure to DDE, a metabolite of DDT, and other pesticides causes conformational changes in the estrogen receptor. Before examining these factors, this work examines the protein unfolding from the antagonist form found in the 3ERT PDB crystal structure. The 3ERT PDB crystal structure has the estrogen receptor bound to the cancer drug 4-hydroxytamoxifen. The 4-hydroxytamoxifen ligand was extracted before the simulation, resulting in new conformational freedom due to absence of van der Waals contacts between the ligand and the receptor. The conformational changes that result expose the binding clef of the co peptide beside Helix 12 of the receptor forming an apo conformation. Two key conformations in the loops at either end of the H12 are produced resulting in the antagonist to apo conformation transformation. The results were produced over a 42ns Molecular Dynamics simulation using the AMBER FF99SB force field.
Keywords: Molecular Dynamics; Estrogen Receptor alpha (ER alpha); ER alpha ligand binding domain (LBD) Molecular Dynamics; Estrogen Receptor alpha (ER alpha); ER alpha ligand binding domain (LBD)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

McGee, T.D.; Edwards, J.; Roitberg, A.E. Preliminary Molecular Dynamic Simulations of the Estrogen Receptor Alpha Ligand Binding Domain from Antagonist to Apo. Int. J. Environ. Res. Public Health 2008, 5, 111-114.

AMA Style

McGee TD, Edwards J, Roitberg AE. Preliminary Molecular Dynamic Simulations of the Estrogen Receptor Alpha Ligand Binding Domain from Antagonist to Apo. International Journal of Environmental Research and Public Health. 2008; 5(2):111-114.

Chicago/Turabian Style

McGee, T. D.; Edwards, Jesse; Roitberg, Adrian E. 2008. "Preliminary Molecular Dynamic Simulations of the Estrogen Receptor Alpha Ligand Binding Domain from Antagonist to Apo." Int. J. Environ. Res. Public Health 5, no. 2: 111-114.



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