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Mol. Cell. Biol., Jul 1996, 3807-3813, Vol 16, No. 7
IG Schulman, H Juguilon and RM Evans
Transactivation-defective retinoid X and thyroid hormone receptors have
been used to examine mechanisms of hormonal activation. Activation and
repression of transcription by retinoid X and thyroid hormone receptors are
shown to be mediated by physically distinct and functionally independent
regions of the hormone binding domain. Nevertheless, the ability of
receptors to respond to hormone requires communication between both
functional domains. Deletion of the hormone-dependent transactivation
function of the retinoid X receptor, the common subunit of heterodimeric
nuclear receptors, significantly impairs hormone- dependent transcription
by retinoic acid, thyroid hormone, and vitamin D receptors. The results
indicate that receptors do not exist in static off and on conformations but
that hormone alters an equilibrium between inactive and active states.
Copyright © 1996, American Society for Microbiology
Activation and repression by nuclear hormone receptors: hormone modulates an equilibrium between active and repressive states
Howard Hughes Medical Institute, Salk Institute for Biological Studies, La Jolla, California 92037, USA.
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