Abstract
The complexes of the estrogen α-receptor with estradiol and 8-isoestradiol were comparatively analyzed. The computations of ligand–receptor complexes, carried out using the FLEXX program, allowed us to propose a model for the binding of the analogues of 8-isoestradiol. It was found that rings Cand D of estradiol and 8-isoestradiol are similarly arranged in the ligand-binding pocket and coincide upon the superposition of the corresponding ligand–receptor complexes, whereas rings A and B do not coincide. The oxygen functions in position 17 of the estradiol analogues of both series coincide upon superposition, whereas the phenol 3-hydroxyl groups are 0.05 Å apart. A comparison of the predicted biological properties of modified estradiol analogues of the natural and 8-iso-series with the available experimental data revealed their similarity. Synthetic 2-acetyl analogues of 8-isoestrogens were found to have no uterotropic activity, which is also consistent with the proposed model.
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Shavva, A.G., Vlasova, K.V., Tsogoeva, S.B. et al. A Study of the Binding of Estradiol and 8-Isoestradiol to the Estrogen α-Receptor by Molecular Modeling. Russian Journal of Bioorganic Chemistry 28, 209–214 (2002). https://doi.org/10.1023/A:1015756220637
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DOI: https://doi.org/10.1023/A:1015756220637