In Silico Elucidation of the Plausible Inhibitory Potential of Withaferin A of Withania Somnifera Medicinal Herb Against Breast Cancer Targeting Estrogen Receptor

Mohammad   A.   Ali; Mohammad    Abul    Farah; Khalid    M.    Al-Anazi; Syed    H.   Basha; Fang       Bai; Joongku       Lee; Fahad    M.A.    Al-Hemaid; Ahmed    H.   Mahmoud; Waleed    A.Q.    Hailan

doi:10.2174/1389201021666200129121843

Abstract

Background: Estrogen Receptors (ER) are members of the nuclear intracellular receptors family. ER once activated by estrogen, it binds to DNA via translocating into the nucleus and regulates the activity of various genes. Withaferin A (WA) - an active compound of a medicinal plant Withania somnifera was reported to be a very effective anti-cancer agent and some of the recent studies has demonstrated that WA is capable of arresting the development of breast cancer via targeting estrogen receptor.

Objective: The present study is aimed at understanding the molecular level interactions of ER and Tamoxifen in comparison to Withaferin A using In-silico approaches with emphasis on Withaferin A binding capability with ER in presence of point mutations which are causing de novo drug resistance to existing drugs like Tamoxifen.

Methods: Molecular modeling and docking studies were performed for the Tamoxifen and Withaferin A with the Estrogen receptor. Molecular docking simulations of estrogen receptor in complex with Tamoxifen and Withaferin A were also performed.

Results: Amino acid residues, Glu353, Arg394 and Leu387 was observed as crucial for binding and stabilizing the protein-ligand complex in case of Tamoxifen and Withaferin-A. The potential of Withaferin A to overcome the drug resistance caused by the mutations in estrogen receptor to the existing drugs such as Tamoxifen was demonstrated.

Conclusion: In-silico analysis has elucidated the binding mode and molecular level interactions which are expected to be of great help in further optimizing Withaferin A or design / discovery of future breast cancer inhibitors targeting estrogen receptor.

Keywords: Withania Somnifera, estrogen receptor, tamoxifen, withaferin A, molecular docking, molecular dynamics simulations.

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DOI https://dx.doi.org/10.2174/1389201021666200129121843	Print ISSN 1389-2010
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In Silico Elucidation of the Plausible Inhibitory Potential of Withaferin A of Withania Somnifera Medicinal Herb Against Breast Cancer Targeting Estrogen Receptor

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