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  • RXR and RAR are nuclear receptors that bind either all trans retinoic (tRA) or 9cis retinoic acid (9cisRA). In the absence of ligand corepressors with histone deacetylase activity are bound to the RAR/RXR heterodimer and suppress transcription. Once they bind retinoic acid a conformational change in the receptors cause the dissociation of the corepressors and the binding of coactivators with histone acetylase activity. Following ligand binding by the heterodimer the receptors and proteins in the basal transcription machinery (like TBP and TAF135) are degraded by the proteasome. (This definition may be outdated - see the DesignNote.)
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