NCIt definition : Retinoid receptors (RARA, RARB, RARG) require co-regulators to increase selective
binding to DNA response elements in target genes and enhance transcriptional activity.;
NCIt note : A protein that binds retinoic acid with high affinity. Binding of ligand to RARs attracts
co-activator proteins containing a NR box. NCOR1 and SMRT contain CoRNR box sequences,
similar to the NR box, in receptor interaction domains and mediate inhibition of gene
transcription by RARs. Sequences flanking the CoRNR box determine receptor specificity.
Differential recognition of receptors by co-activators and co-repressors is due to
subtle differences between CoRNR and NR boxes. The association of SMRT with receptors
is destabilized by ligand, triggering the activation process. (from OMIM 180240 and
NCI);