| First Author | Vucetic Z | Year | 2008 |
| Journal | Mol Cell Biol | Volume | 28 |
| Issue | 8 | Pages | 2549-58 |
| PubMed ID | 18250153 | Mgi Jnum | J:133932 |
| Mgi Id | MGI:3784662 | Doi | 10.1128/MCB.01199-07 |
| Citation | Vucetic Z, et al. (2008) Acinus-S' represses retinoic acid receptor (RAR)-regulated gene expression through interaction with the B domains of RARs. Mol Cell Biol 28(8):2549-58 |
| abstractText | The diverse biological actions of retinoic acid (RA) are mediated by RA receptors (RARs) and retinoid X receptors (RXRs). Modulation of transcription by RARs/RXRs is achieved through two activation functions, ligand-independent AF-1 and ligand-dependent AF-2, located in the A/B and E domains, respectively. While the coregulatory proteins that interact with the E domain are well studied, the A/B domain-interacting partners and their influence(s) on the function of RARs are poorly understood. Acinus-S' is an ubiquitous nuclear protein that has been implicated in inducing apoptotic chromatin condensation and regulating mRNA processing. Our data demonstrate that Acinus-S' can specifically repress ligand-independent and ligand-dependent expression of a DR5 RA response element(RARE)-dependent reporter gene and several endogenous RAR-regulated genes in a dose-dependent and gene-specific manner. Chromatin immunoprecipitation assays show that Acinus-S' associates with RAREs within the promoters of endogenous genes independent of RA treatment. Furthermore, the C-terminal end of Acinus-S' and the B domain of RARbeta interact independently of ligand, and the C-terminal end of Acinus-S' is sufficient for the repression of RAR-regulated gene expression. Finally, histone deacetylase activity only partially accounts for the repressive effect of Acinus-S' on RAR-dependent gene expression. These findings identify Acinus-S' as a novel RAR-interacting protein that regulates the expression of a subset of RAR-regulated genes through direct binding to the N-terminal B domains of RARs. |
