3afr

Crystal Structure of VDR-LBD/22S-Butyl-1a,24R-dihydroxyvitamin D3 complex

spinqualitylabelsall models 3afr, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3afr is a 2 chain structure with sequence from Rattus norvegicus and Xenopus tropicalis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: ICJ Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed We recently reported that 22S-butyl-1alpha,24R-dihydroxyvitamin D(3)3 recovers the agonistic activity for vitamin D receptor (VDR), although its 25,26,27-trinor analog 2 is a potent VDR antagonist. To investigate the structural features involved in the recovery of agonism, we crystallized the ternary complex of VDR-ligand-binding domain, ligand 3 and coactivator peptide, and conducted X-ray crystallographic analysis of the complex. Compared with the complex with 2, the complex with 3 recovered the following structural features: a pincer-type hydrogen bond between the 24-hydroxyl group and VDR, the conformation of Leu305, the positioning of His301 and His393, the stability of the complex, and intimate hydrophobic interactions between the ligand and helix 12. In addition, we evaluated the potency of both compounds for recruiting RXR and coactivator. The results indicate that the complex with 3 generates a suitable surface for coactivator recruitment. These studies suggest that the action of 2 as an antagonist is caused by the generation of a surface not suitable for coactivator recruitment due to the lack of hydrophobic interactions with helix 12 as well as insufficient hydrogen bond formation between the 24-hydroxyl group and VDR. We concluded that the action of 3 as an agonist is based on the elimination of these structural defects in the complex with 2. 22S-butyl-1alpha,24R-dihydroxyvitamin D3: recovery of vitamin D receptor agonistic activity.,Inaba Y, Nakabayashi M, Itoh T, Yoshimoto N, Ikura T, Ito N, Shimizu M, Yamamoto K J Steroid Biochem Mol Biol. 2010 Jul;121(1-2):146-50. Epub 2010 Mar 6. PMID:20211257 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Sandbox vdr Vitamin D receptor 3D structures

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