Binding of liganded vitamin D receptor to the vitamin D receptor interacting protein coactivator complex induces interaction with RNA polymerase II holoenzyme

Natsuko Chiba, Zalman Suldan, Leonard P. Freedman, Jeffrey D. Parvin

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

Because the vitamin D receptor interacting protein (DRIP) coactivator complex shares components with the RNA polymerase II (Pol II) holoenzyme complex, we tested whether the two protein complexes associate in cellular extracts. On initial purification steps, the DRIP complex copurified with the Pol II holoenzyme. Pol II was found to bind to the vitamin D receptor in a ligand-dependent fashion when either nuclear extracts or partially purified preparations were used as sources of DRIP and Pol II holoenzyme. A subpopulation of holoenzyme complexes bound to the receptor because BRCA1, which associates with the Pol II holoenzyme, did not associate with the liganded receptor, and only in certain of the holoenzyme- and DRIP-containing fractions did Pol II bind to the liganded receptor. Immunoprecipitation experiments revealed that the DRIP complex was not pre-associated with the Pol II holoenzyme, but the interaction between these two complexes was induced only in the presence of receptor and ligand. These data support a model in which the activation of transcription by hormone-bound receptor requires binding to the DRIP coactivator, and this induced ternary complex can then bind to the Pol II holoenzyme to activate transcription.

Original languageEnglish
Pages (from-to)10719-10722
Number of pages4
JournalJournal of Biological Chemistry
Volume275
Issue number15
DOIs
Publication statusPublished - 2000 Apr 14
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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