| Structural highlights
Function
MED1_HUMAN Component of the Mediator complex, a coactivator involved in the regulated transcription of nearly all RNA polymerase II-dependent genes. Mediator functions as a bridge to convey information from gene-specific regulatory proteins to the basal RNA polymerase II transcription machinery. Mediator is recruited to promoters by direct interactions with regulatory proteins and serves as a scaffold for the assembly of a functional preinitiation complex with RNA polymerase II and the general transcription factors.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]
Publication Abstract from PubMed
Both 25 R- and 25 S-25-adamantyl-23-yne-26,27-dinor-1alpha,25-dihydroxyvitamin D3 (4a and 4b) were stereoselectively synthesized by a Pd(0)-catalyzed ring closure and Suzuki-Miyaura coupling between enol-triflate 7 and alkenyl-boronic ester 8. The 25 S isomer (4b) showed high vitamin D receptor (VDR) affinity (50% of that of the natural hormone 1alpha,25-dihydroxyvitamin D3, 1) and transactivation potency (kidney HEK293, 90%). In endogenous gene expression, it showed high cell-type selectivity for kidney cells (HEK293, CYP24A1 160% of 1), bone cells (MG63, osteocalcin 64%), and monocytes (U937, CAMP 96%) over intestine (SW480, CYP24A1 8%) and skin (HaCaT, CYP24A1 7%) cells. The X-ray crystal structural analysis of 4b in complex with rat VDR-ligand binding domain (LBD) showed the highest Calpha positional shift from the 1/VDR-LBD complex at helix 11. Helix 11 of the 4b and 1 VDR-LBD complexes also showed significant differences in surface properties. These results suggest that 4b should be examined further as another candidate for a mild preventive osteoporosis agent.
25 S-Adamantyl-23-yne-26,27-dinor-1alpha,25-dihydroxyvitamin D3: Synthesis, Tissue Selective Biological Activities, and X-ray Crystal Structural Analysis of Its Vitamin D Receptor Complex.,Otero R, Ishizawa M, Numoto N, Ikura T, Ito N, Tokiwa H, Mourino A, Makishima M, Yamada S J Med Chem. 2018 Jul 23. doi: 10.1021/acs.jmedchem.8b00427. PMID:29989817[12]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Yuan CX, Ito M, Fondell JD, Fu ZY, Roeder RG. The TRAP220 component of a thyroid hormone receptor- associated protein (TRAP) coactivator complex interacts directly with nuclear receptors in a ligand-dependent fashion. Proc Natl Acad Sci U S A. 1998 Jul 7;95(14):7939-44. PMID:9653119
- ↑ Zhang J, Fondell JD. Identification of mouse TRAP100: a transcriptional coregulatory factor for thyroid hormone and vitamin D receptors. Mol Endocrinol. 1999 Jul;13(7):1130-40. PMID:10406464
- ↑ Wang Q, Sharma D, Ren Y, Fondell JD. A coregulatory role for the TRAP-mediator complex in androgen receptor-mediated gene expression. J Biol Chem. 2002 Nov 8;277(45):42852-8. Epub 2002 Sep 5. PMID:12218053 doi:10.1074/jbc.M206061200
- ↑ Ge K, Guermah M, Yuan CX, Ito M, Wallberg AE, Spiegelman BM, Roeder RG. Transcription coactivator TRAP220 is required for PPAR gamma 2-stimulated adipogenesis. Nature. 2002 May 30;417(6888):563-7. PMID:12037571 doi:10.1038/417563a
- ↑ Kang YK, Guermah M, Yuan CX, Roeder RG. The TRAP/Mediator coactivator complex interacts directly with estrogen receptors alpha and beta through the TRAP220 subunit and directly enhances estrogen receptor function in vitro. Proc Natl Acad Sci U S A. 2002 Mar 5;99(5):2642-7. Epub 2002 Feb 26. PMID:11867769 doi:10.1073/pnas.261715899
- ↑ Coulthard VH, Matsuda S, Heery DM. An extended LXXLL motif sequence determines the nuclear receptor binding specificity of TRAP220. J Biol Chem. 2003 Mar 28;278(13):10942-51. Epub 2003 Jan 29. PMID:12556447 doi:10.1074/jbc.M212950200
- ↑ Wallberg AE, Yamamura S, Malik S, Spiegelman BM, Roeder RG. Coordination of p300-mediated chromatin remodeling and TRAP/mediator function through coactivator PGC-1alpha. Mol Cell. 2003 Nov;12(5):1137-49. PMID:14636573
- ↑ Wu Q, Burghardt R, Safe S. Vitamin D-interacting protein 205 (DRIP205) coactivation of estrogen receptor alpha (ERalpha) involves multiple domains of both proteins. J Biol Chem. 2004 Dec 17;279(51):53602-12. Epub 2004 Oct 5. PMID:15471764 doi:10.1074/jbc.M409778200
- ↑ Malik S, Guermah M, Yuan CX, Wu W, Yamamura S, Roeder RG. Structural and functional organization of TRAP220, the TRAP/mediator subunit that is targeted by nuclear receptors. Mol Cell Biol. 2004 Sep;24(18):8244-54. PMID:15340084 doi:10.1128/MCB.24.18.8244-8254.2004
- ↑ Zhang X, Krutchinsky A, Fukuda A, Chen W, Yamamura S, Chait BT, Roeder RG. MED1/TRAP220 exists predominantly in a TRAP/ Mediator subpopulation enriched in RNA polymerase II and is required for ER-mediated transcription. Mol Cell. 2005 Jul 1;19(1):89-100. PMID:15989967 doi:10.1016/j.molcel.2005.05.015
- ↑ Udayakumar TS, Belakavadi M, Choi KH, Pandey PK, Fondell JD. Regulation of Aurora-A kinase gene expression via GABP recruitment of TRAP220/MED1. J Biol Chem. 2006 May 26;281(21):14691-9. Epub 2006 Mar 30. PMID:16574658 doi:M600163200
- ↑ Otero R, Ishizawa M, Numoto N, Ikura T, Ito N, Tokiwa H, Mourino A, Makishima M, Yamada S. 25 S-Adamantyl-23-yne-26,27-dinor-1alpha,25-dihydroxyvitamin D3: Synthesis, Tissue Selective Biological Activities, and X-ray Crystal Structural Analysis of Its Vitamin D Receptor Complex. J Med Chem. 2018 Jul 23. doi: 10.1021/acs.jmedchem.8b00427. PMID:29989817 doi:http://dx.doi.org/10.1021/acs.jmedchem.8b00427
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