2ZLA

2-Substituted-16-ene-22-thia-1alpha,25-dihydroxy-26,27-dimethyl-19-norvitamin D3 analogs: Synthesis, biological evaluation and crystal structure


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 
    0.263 (Depositor), 0.260 (DCC) 
  • R-Value Work: 
    0.213 (Depositor), 0.210 (DCC) 
  • R-Value Observed: 
    0.213 (Depositor) 

Starting Model: experimental
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Ligand Structure Quality Assessment 

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This is version 1.2 of the entry. See complete history


Literature

2-Substituted-16-ene-22-thia-1alpha,25-dihydroxy-26,27-dimethyl-19-norvitamin D3 analogs: Synthesis, biological evaluation, and crystal structure

Shimizu, M.Miyamoto, Y.Takaku, H.Matsuo, M.Nakabayashi, M.Masuno, H.Udagawa, N.DeLuca, H.F.Ikura, T.Ito, N.

(2008) Bioorg Med Chem 16: 6949-6964

  • DOI: https://doi.org/10.1016/j.bmc.2008.05.043
  • Primary Citation of Related Structures:  
    2ZL9, 2ZLA, 2ZLC

  • PubMed Abstract: 

    Recently, we have found that 16-ene-22-thia-26,27-dimethyl-19-norvitamin D(3) analogs 1a (n=2, 3) are 20 times more active than the natural hormone 1alpha,25-dihydroxyvitamin D(3) in terms of transcriptional activity. To further investigate the effects of the A-ring modification of 1a, b on the biological activity profile, novel 22-thia-19-norvitamin D analogs 2-11 bearing a hydroxyethoxy-, hydroxyethylidene- or methyl group at C-2 in combination with 20S- and 20R-isomers were prepared and tested for their in vitro biological activities. All of the synthesized analogs showed 0.5-140% of the activity of the natural hormone in binding to the vitamin D receptor (VDR). When compared with the transcriptional activity of C-2 or C-20 isomeric pairs of the 22-thia analogs, the 20S-isomers 2-11a were more potent than the 20R-isomers 2, 3, 8-11b, and the 2beta-hydroxyethoxy, 2E-hydroxyethylidene, and 2alpha-methyl-2beta-hydroxy-22-thia isomers showed higher potency than their corresponding counterparts. In particular, 3a exhibited an extremely higher level of potency (210-fold) than the natural hormone. To elucidate the action mode of superagonist 3a at the molecular level, we determined the crystal structures of the rat VDR-ligand-binding domain complexed with 3a or 3b in the presence of peptide containing a nuclear box motif (LxxLL) at 1.9-2.0A resolution. The crystal structures demonstrated that the 1alpha-OH, 3beta-OH, and 25-OH groups of the natural hormone and 3a were anchored by the same amino acid residues in the ligand-binding pocket, and the terminal OH moiety of the substituent at C-2 formed hydrogen bonds with Arg270 and a water molecule to create a tight water molecule network. Moreover, the methyl groups at C-26a and C-27a make additional contact with hydrophobic residues such as Leu223, Ala227, Val230, and Ala299. These hydrophilic and hydrophobic interactions in 3a may underlie the induction of superagonistic activity.


  • Organizational Affiliation

    Laboratory of Medicinal Chemistry, School of Biomedical Science, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Vitamin D3 receptor271Rattus norvegicusMutation(s): 0 
Gene Names: VdrNr1i1
UniProt
Find proteins for P13053 (Rattus norvegicus)
Explore P13053 
Go to UniProtKB:  P13053
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13053
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Coactivator peptide DRIPB [auth C]13N/AMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
VDB
Query on VDB

Download Ideal Coordinates CCD File 
C [auth A](1R,2S,3R,5Z,7E)-17-{(1R)-1-[(2-ethyl-2-hydroxybutyl)sulfanyl]ethyl}-2-(2-hydroxyethoxy)-9,10-secoestra-5,7,16-triene-1,3-diol
C28 H46 O5 S
DUIYWCMQVXJTIP-XXAWZNHHSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free:  0.263 (Depositor), 0.260 (DCC) 
  • R-Value Work:  0.213 (Depositor), 0.210 (DCC) 
  • R-Value Observed: 0.213 (Depositor) 
Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 153.985α = 90
b = 42.002β = 95.77
c = 42.152γ = 90
Software Package:
Software NamePurpose
CNSrefinement
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted VDBClick on this verticalbar to view details

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-06-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description