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Hydroxylated triphenylacrylonitriles adopt a unique orientation within the binding site of the estrogen receptor.
Journal of Steroid Biochemistry 1990 August 15
The relative binding affinities of a series of twelve para-hydroxylated triphenylethylenes (TPEs) for the estradiol receptor (ER) of calf uterus cytosol were measured by a competition method. The results obtained under equilibrium conditions support the hypothesis of the additivity of the energies corresponding to each of the hydrogen-bond type interactions of di- or tri-hydroxylated TPEs with the estradiol binding site of ER and strongly suggest that, whichever ring is hydroxylated, the orientation of the TPE in the steroid binding site is always the same. A hydroxyl group in a given position always interacts with the same location within the site. Mono-hydroxylation of the highly hydrophobic non-substituted TPE skeleton led to a large increase in relative binding affinity for ER which could be explained by a dual mechanism whereby the interaction specific to the hydroxyl is accompanied by a temperature- or time-dependent binding process that is not related to the hydroxylation position.
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