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• W2030452267 abstract "The NMR-derived structure of estrogen (17β-estradiol, E2), the drug of choice for postmenopausal women, was compared with a recent literature crystal x-ray structure of Fab-bound E2. 1H and 13C NMR spectra of E2 were acquired in DMSO-d6. Assignments were obtained from an analysis of DQF-COSY, TOCSY, HETCOR, HMQC and HMBC 2D NMR spectra. The 1H and 13C NMR assignments are the first reported for E2 in DMSO-d6. Two solution structures, S1 and S2, were obtained with molecular modeling using NOE constraints. S1 overlaps with the crystal structure for all rings. S2 shows prominent differences in the C-ring (C9C11C12C13) segment, which deviates from a chair conformation, and excellent overlap in the A-, B- and D-rings of E2. The C-ring in S2 adopts a boat conformation as opposed to a chair conformation in the x-ray and S1 structures. The S2 structure is about 6° more twisted than the bound x-ray and S1 models. The S1, S2 and x-ray structures had ring bowing values of 10.1 ± 0.3, 11 ± 1 and 10.37°, respectively. Of the 100 solution conformers generated, 83 had S1 conformation and 17 had S2 conformation, with average internal energies of 112 ± 2 and 141 ± 2 kcal mol−1, respectively. The 100 S1- and S2- derived conformers showed a r.m.s.d. of 0.72 Å for all atoms. The x-ray, S1 and S2 C18O17 distances were 2.93, 2.92 ± 0.01 and 2.93 ± 0.01 Å, respectively, and the O3O17 distances were 11.06, 11.18 ± 0.12, and 10.89 ± 0.05 Å, respectively. Copyright © 2005 John Wiley & Sons, Ltd." @default.
• W2030452267 created "2016-06-24" @default.
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• W2030452267 date "2005-01-01" @default.
• W2030452267 modified "2023-10-01" @default.
• W2030452267 title "Comparison of 17β-estradiol structures from x-ray diffraction and solution NMR" @default.
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• W2030452267 doi "https://doi.org/10.1002/mrc.1581" @default.
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