Phosphorylation at serine 208 of the 1α,25-dihydroxy Vitamin D3 receptor modulates the interaction with transcriptional coactivators

Gloria Arriagada, Roberto Paredes, Juan Olate, Andre van Wijnen, Jane B. Lian, Gary S. Stein, Janet L. Stein, Sergio Onate, Martin Montecino

Resultado de la investigación: Contribución a una revistaArtículo

24 Citas (Scopus)

Resumen

Upon ligand binding the 1α,25-dihydroxy Vitamin D3 receptor (VDR) undergoes a conformational change that allows interaction with coactivator proteins including p160/SRC family members and the multimeric DRIP complex through the DRIP205 subunit. Casein kinase II (CKII) phosphorylates VDR both in vitro and in vivo at serine 208 within the hinge domain. This phosphorylation does not affect the ability of VDR to bind DNA, but increases its ability to transactivate target promoters. Here, we have analyzed whether phosphorylation of VDR by CKII modulates the ability of VDR to interact with coactivators in vitro. We find that both mutation of serine 208 to aspartic acid (VDRS208D) or phosphorylation of VDR by CKII enhance the interaction of VDR with DRIP205 in the presence of 1α,25-dihydroxy Vitamin D3. We also find that the mutation VDRS208D neither affects the ability of this protein to bind DNA nor to interact with SRC-1 and RXRα. Together, our results indicate that phosphorylation of VDR at serine 208 contributes to modulate the affinity of VDR for the DRIP complex and therefore may have a role in vivo regulating VDR-mediated transcriptional enhancement.

Idioma originalInglés
Páginas (desde-hasta)425-429
Número de páginas5
PublicaciónJournal of Steroid Biochemistry and Molecular Biology
Volumen103
N.º3-5
DOI
EstadoPublicada - 1 mar 2007

Áreas temáticas de ASJC Scopus

  • Endocrinología, diabetes y metabolismo
  • Bioquímica
  • Medicina molecular
  • Biología molecular
  • Endocrinología
  • Bioquímica clínica
  • Biología celular

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