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The molecular basis of vitamin D receptor and beta-catenin crossregulation.

Abstract : The signaling/oncogenic activity of beta-catenin can be repressed by activation of the vitamin D receptor (VDR). Conversely, high levels of beta-catenin can potentiate the transcriptional activity of 1,25-dihydroxyvitamin D3 (1,25D). We show here that the effects of beta-catenin on VDR activity are due to interaction between the activator function-2 (AF-2) domain of the VDR and C terminus of beta-catenin. Acetylation of the beta-catenin C terminus differentially regulates its ability to activate TCF or VDR-regulated promoters. Mutation of a specific residue in the AF-2 domain, which renders the VDR trancriptionally inactive in the context of classical coactivators, still allows interaction with beta-catenin and ligand-dependent activation of VDRE-containing promoters. VDR antagonists, which block the VDRE-directed activity of the VDR and recruitment of classical coactivators, do allow VDR to interact with beta-catenin, which suggests that these and perhaps other ligands would permit those functions of the VDR that involve beta-catenin interaction.
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Contributor : Jean-Luc Toussaint Connect in order to contact the contributor
Submitted on : Thursday, November 15, 2007 - 5:15:03 PM
Last modification on : Thursday, June 17, 2021 - 3:16:03 PM

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Salimuddin Shah, Md Naimul Islam, Sivanesan Dakshanamurthy, Imran Rizvi, Mahadev Rao, et al.. The molecular basis of vitamin D receptor and beta-catenin crossregulation.. Molecular Cell, Elsevier, 2006, 21 (6), pp.799-809. ⟨10.1016/j.molcel.2006.01.037⟩. ⟨hal-00188140⟩



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