2000年4月
Binding of liganded vitamin D receptor to the vitamin D receptor interacting protein coactivator complex induces interaction with RNA polymerase II holoenzyme
JOURNAL OF BIOLOGICAL CHEMISTRY
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- ,
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- 巻
- 275
- 号
- 15
- 開始ページ
- 10719
- 終了ページ
- 10722
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1074/jbc.275.15.10719
- 出版者・発行元
- AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
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, hut 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.
- リンク情報
- ID情報
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- DOI : 10.1074/jbc.275.15.10719
- ISSN : 0021-9258
- Web of Science ID : WOS:000086466600002