2020/12/20 by Ricardo Ugarte, Ugarte, Ricardo
Biochemistry, Genetics and Molecular Biology · Chemistry · Materials Science · #Estrogen and related hormone effects #Free Radicals and Antioxidants #Nonlinear Optical Materials Research #q-bio.BM
paper · pdf · doi:10.48550/arxiv.2012.10822
12 pages, 10 figures; PCA modes movies. arXiv admin note: text overlap with arXiv:1907.10808. The interaction energy in aqueous systems is corrected (Tables III and IV)
arxiv created 2022/01/08 · arxiv updated 2022/01/11
The estrogen receptor is a nuclear hormone receptor activated by the natural steroid hormone 17β-estradiol (E2). Fragment molecular orbital (FMO) calculations were performed which allowed us to obtain the interaction energy (Eint) between E2, 17α-estradiol (17α-E2) and the human estrogen receptor α ligand-binding domain. In aqueous media the MP2/6-31G(d) Eint was of -88.52 kcal/mol for E2 and -78.73 kcal/mol for 17α-E2. Attractive dispersion interactions were observed between ligands and all surrounding hydrophobic residues. Water molecules were found at the binding site and strong attractive electrostatic interactions were observed between the ligands and the Glu 353 and His 524 residues. The essential dynamics revealed that E2 adapts to the binding site and its motion, in a sense, synchronizes with the whole receptor; while 17α-E2, with its motion of greater amplitude compared to E2, disturbs the binding site. Perhaps this feature of the normal substrate is a necessary condition for biological function. Another important requirement relates to the number of water molecules at the binding site. Therefore, negative values in Eint is a necessary but not sufficient condition since, it is also necessary to consider the conformers population that fulfill all the requirements that ensure a biological response.