Abstract
Nuclear magnetic resonance (NMR) spectroscopy is a useful biophysical technique to study the ligand–protein interaction. In this report, we have used bacterially produced ERβ and its domains for studying the functional analysis of ligand–protein interaction. Briefly, ERβ and its transactivation domain (TAD) and ligand binding domain (LBD) were subcloned and overexpressed using a prokaryotic expression system. The recombinant proteins were purified using Ni+2-IDA affinity chromatography and analyzed by NMR. Purified ERβ and TAD show similar conformation in the absence or presence of 17β-estradiol. However, LBD shows altered conformation in the presence of 17β-estradiol. These findings suggest that ERβ produced in bacteria exhibits a conformation such that its LBD remains masked and consequently it binds less to 17β-estradiol. Such study may help to develop the therapeutic approaches for controlling the estradiol-mediated gene expression in hormone dependent diseases.
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Acknowledgments
We sincerely thank the financial assistance received from the Department of Biotechnology (DBT), Department of Science and Technology (DST) and Indian Council of Medical Research (ICMR), Government of India to MKT. The research fellowship from ICMR to VP is highly acknowledged.
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Paramanik, V., Thakur, M.K. NMR analysis reveals 17β-estradiol induced conformational change in ERβ ligand binding domain expressed in E. coli . Mol Biol Rep 38, 4657–4661 (2011). https://doi.org/10.1007/s11033-010-0600-6
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DOI: https://doi.org/10.1007/s11033-010-0600-6