Structural highlights
Function
VDR_RAT Nuclear hormone receptor. Transcription factor that mediates the action of vitamin D3 by controlling the expression of hormone sensitive genes. Regulates transcription of hormone sensitive genes via its association with the WINAC complex, a chromatin-remodeling complex. Recruited to promoters via its interaction with the WINAC complex subunit BAZ1B/WSTF, which mediates the interaction with acetylated histones, an essential step for VDR-promoter association. Plays a central role in calcium homeostasis.[1]
Publication Abstract from PubMed
1alpha,25-Dihydroxyvitamin D3 exerts its actions by binding to vitamin D receptor (VDR). We are continuing the study related to the alteration of pocket structure of VDR by 22-alkyl substituent of ligands and the relationships between the alteration and agonistic/antagonistic activity. Previously we reported that compounds 2 (22-H), 3 (22S-Et), and 4 (22S-Bu) are VDR agonist, partial agonist and antagonist, respectively. Here, we describe the synthesis and biological evaluation of 22S-hexyl analog 5 (22S-Hex), which was designed to be a stronger VDR antagonist than 4. Unexpectedly, 5 showed partial agonistic but not antagonistic activity when bound to VDR, indicating that it is not necessarily true that the bulkier the side chain is, the stronger the antagonistic activity will be. X-ray crystallographic analysis of the VDR-ligand-binding domain (VDR-LBD) accommodating compound 5 indicated that the partial agonist activity of 5 is dependent on the mixed population of the agonistic and antagonistic conformations. Binding of compound 5 may not bring the complex into the only antagonistic conformation due to the large conformational change of the VDR-LBD. From this study it was found that fine tuning of agonistic/antagonistic activity for VDR is possible by 22-alkyl chain length of ligands.
Fine tuning of agonistic/antagonistic activity for vitamin D receptor by 22-alkyl chain length of ligands: 22S-Hexyl compound unexpectedly restored agonistic activity.,Anami Y, Sakamaki Y, Itoh T, Inaba Y, Nakabayashi M, Ikura T, Ito N, Yamamoto K Bioorg Med Chem. 2015 Nov 15;23(22):7274-81. doi: 10.1016/j.bmc.2015.10.026. Epub, 2015 Oct 26. PMID:26515040[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Vanhooke JL, Tadi BP, Benning MM, Plum LA, DeLuca HF. New analogs of 2-methylene-19-nor-(20S)-1,25-dihydroxyvitamin D3 with conformationally restricted side chains: evaluation of biological activity and structural determination of VDR-bound conformations. Arch Biochem Biophys. 2007 Apr 15;460(2):161-5. Epub 2006 Dec 12. PMID:17227670 doi:10.1016/j.abb.2006.11.029
- ↑ Anami Y, Sakamaki Y, Itoh T, Inaba Y, Nakabayashi M, Ikura T, Ito N, Yamamoto K. Fine tuning of agonistic/antagonistic activity for vitamin D receptor by 22-alkyl chain length of ligands: 22S-Hexyl compound unexpectedly restored agonistic activity. Bioorg Med Chem. 2015 Nov 15;23(22):7274-81. doi: 10.1016/j.bmc.2015.10.026. Epub, 2015 Oct 26. PMID:26515040 doi:http://dx.doi.org/10.1016/j.bmc.2015.10.026
