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Functional domain of vitamin D receptor

Research Project

Project/Area Number 06672181
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Biological pharmacy
Research InstitutionOsaka University

Principal Investigator

NISHIHARA Tsutomu  Osaka University, Fac.of Pharm.Sci. ; Professor, 薬学部, 教授 (50028859)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsVitamin D receptor / Nuclear receptor / Gene expression / DNA binding protein / Transcription / ビタミンD / ホルモンレセプター
Research Abstract

1alpha, 25-dihydroxyvitamin D_3, the most active metabolite of vitamin D_3, is a multifunctional agent. The actions of 1alpha, 25-dihydroxyvitamin D_3 are mediated through its receptor (VDR) that activates the specific genes in a ligand-dependent manner. In order to investigate the details of functional domains of VDR,we have developed the overexpression and purification system of various portions of VDR as well as a full-length VDR.
At first, we investigated the DNA binding domain. The region of amino acids 23-123 is enough for binding of VDR to specific DNA sequence called as vitamin D responsible element. However, VDR alone showed a week affinity for DNA and retinoid X receptor (RXR) definitely increased the binding affinity. Second, we determined the location of ligand binding domain. The deletion of C-terminal 21 amino acids completely diminished the ligand binding activity. Regarding the N-terminus, the region following the 124th amino acid was required for a detectable level of ligand binding activity. Third, we have mapped the dimerization interfaces of VDR that is involved in homo- or heterodimer formation. The deletion analysis showed that the VDR has at least three dimerization interfaces whose functions are apparently distinguishable. Finally, we picked out two VDREs from rat genomic DNA using binding site selection method. One is identified as negative VDRE and another is positive VDRE.Both of them are novel genes because no sequence sharing significant similarity to databases was found. Further analyzes of these genes would provide knowledge about the biological function of vitamin D.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Jun-ichi Nishikawa: "Difference and similarity of DNA sequence recognized by VDR homodimer and VDR/RXR heterodimer." Nucleic Acids Res.22. 2902-2907 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Jun-ichi Nishikawa: "Vitamin Dreceptor contains multiple dimerization interfaces that are functionally different." Nucleic Acids Res.23. 606-611 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kenji Sakoda: "Isolation of a genomic DNA fragment having negative vitamin Dresponse element." Biochem. Biophys. Res. Commun.219. 31-35 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Jun-ichi Nishikawa: "Difference and similarity of DNA sequence recognized by VDR homodimer and VDR/RXR heterodimer." Nucleic Acids Res.22. 2902-2907 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Jun-ichi Nishikawa: "Vitamin D receptor contains multiple dimerization interfaces that are functionally different." Nucleic Acids Res.23. 606-611 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kenji Sakad: "Isolation of a genomic DNA fragment having negative vitamin D response element." Biochem.Biophys.Res.Commun.219. 31-35 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Jun-ichi Nishikawa: "Vitamin D receptor contains multiple dimerization interfaces that functionally different." Nucl.Acids Res.,. 23. 606-611 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Kenji Sakoda: "Isolation of a genomic DNA fragment having negative vitamin D response element." Biochem.Biophys.Res.Commun.,. (印刷中). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Jun-ichi Nishikawa: "Difference and similarity of DNA sequence recognized by VDR homodimer and VDR/RXR heterodimer." Nucl.Acids Res.,. 22. 2902-2907 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Jun-ichi Nishikawa: "Vitamine D receptor contains multiple dimerization interfaces that are functionally different." Nucl.Acids Res.,. 23(印刷中). (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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