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Department of Pharmacological and Physiological Science (H. M., C. M. B., P. N. M.), Saint Louis University Health Science Center, St. Louis, Missouri 63104, Genetics Unit, Shriners Hospital (R. S.), Montreal, Quebec H3G 1A6, Canada
Address correspondence to: Paul N. MacDonald, Ph.D., Saint Louis University Health Science Center, Department of Pharmacological and Physiological Science, 1402 South Grand Boulevard, St. Louis, Missouri 63104. Reprints are not available.
A ligand-dependent transcriptional activation domain (AF-2) exists in region E of the nuclear receptors. This highly conserved domain may contact several coactivators that are putatively involved in nuclear receptor-mediated transcription. In this study, a panel of vitamin D receptor (VDR) AF-2 mutants was created to examine the importance of several conserved residues in VDR-activated transcription. Two AF-2 mutants (L417S and E420Q) exhibited normal ligand binding, heterodimerization with retinoid X receptor, and vitamin D-responsive element interaction, but they were transcriptionally inactive in a VDR-responsive reporter gene assay. All AF-2 mutations that abolished VDR-mediated transactivation also eliminated interactions between VDR and several putative coactivator proteins including suppressor of gal1 (SUG1), steroid hormone receptor coactivator-1 (SRC-1), or receptor interacting protein (RIP140), suggesting that coactivator interaction is important for AF-2-mediated transcription. In support of this concept, the minimal AF-2 domain [VDR(408427] fused to the gal4 DNA binding domain was sufficient to mediate transactivation as well as interaction with putative coactivators. Introducing the L417S and E420Q mutations into the minimal AF-2 domain abolished this autonomous transactivation and coactivator interactions. Finally, we demonstrate that the minimal AF-2 domain interacted with an AF-2 deletion mutant of the VDR in a 1,25-(OH)2D3-dependent manner, suggesting a ligand-induced intramolecular folding of the VDR AF-2 domain. The L417S mutant of this domain disrupted the interaction with VDR ligand-binding domain, while the E420Q mutant did not affect this interaction. These studies suggest that the conserved AF-2 motif may mediate transactivation through ligand-dependent intermolecular interaction with coactivators and through ligand-induced intramolecular contacts with the VDR ligand-binding domain itself.
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K.-I. Takeyama, Y. Masuhiro, H. Fuse, H. Endoh, A. Murayama, S. Kitanaka, M. Suzawa, J. Yanagisawa, and S. Kato Selective Interaction of Vitamin D Receptor with Transcriptional Coactivators by a Vitamin D Analog Mol. Cell. Biol., February 1, 1999; 19(2): 1049 - 1055. [Abstract] [Full Text] [PDF] |
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C.-H. Lee, C. Chinpaisal, and L.-N. Wei Cloning and Characterization of Mouse RIP140, a Corepressor for Nuclear Orphan Receptor TR2 Mol. Cell. Biol., November 1, 1998; 18(11): 6745 - 6755. [Abstract] [Full Text] |
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B. D. Darimont, R. L. Wagner, J. W. Apriletti, M. R. Stallcup, P. J. Kushner, J. D. Baxter, R. J. Fletterick, and K. R. Yamamoto Structure and specificity of nuclear receptor-coactivator interactions Genes & Dev., November 1, 1998; 12(21): 3343 - 3356. [Abstract] [Full Text] |
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M. Raval-Pandya, L. P. Freedman, H. Li, and S. Christakos Thyroid Hormone Receptor Does Not Heterodimerize with the Vitamin D Receptor but Represses Vitamin D Receptor-Mediated Transactivation Mol. Endocrinol., September 1, 1998; 12(9): 1367 - 1379. [Abstract] [Full Text] |
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T. A. Baudino, D. M. Kraichely, S. C. Jefcoat Jr., S. K. Winchester, N. C. Partridge, and P. N. MacDonald Isolation and Characterization of a Novel Coactivator Protein, NCoA-62, Involved in Vitamin D-mediated Transcription J. Biol. Chem., June 26, 1998; 273(26): 16434 - 16441. [Abstract] [Full Text] [PDF] |
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L.-N. Wei, X. Hu, D. Chandra, E. Seto, and M. Farooqui Receptor-interacting Protein 140 Directly Recruits Histone Deacetylases for Gene Silencing J. Biol. Chem., December 22, 2000; 275(52): 40782 - 40787. [Abstract] [Full Text] [PDF] |
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C. Zhang, T. A. Baudino, D. R. Dowd, H. Tokumaru, W. Wang, and P. N. MacDonald Ternary Complexes and Cooperative Interplay between NCoA-62/Ski-interacting Protein and Steroid Receptor Coactivators in Vitamin D Receptor-mediated Transcription J. Biol. Chem., October 26, 2001; 276(44): 40614 - 40620. [Abstract] [Full Text] [PDF] |
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