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Once retinoids are bound by the RAR/RXR heterodimer they became transcriptional activated. As a consequence they are degraded by the proteasome. Phosphorylation in the activation domain one (AF1) and presence of the activation domain 2 (AF2) triger the ubiquitination of the receptors. Moreover, heterodimerization of RAR and RXR accelerate degradation of the receptors |
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Kopf E, Plassat JL, Vivat V, de The H, Chambon P, Rochette-Egly C. Dimerization with retinoid X receptors and phosphorylation modulate the retinoic acid-induced degradation of retinoic acid receptors alpha and gamma through the ubiquitin-proteasome pathway. J Biol Chem 2000 Oct 27;275(43):33280-8
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