c-ErbAによるリガンド独立活性化を媒介する新しいcis要素:ホルモン調節への影響
F Saatcioglu1, T Deng, M Karin
1Department of Pharmacology, School of Medicine, University of California, San Diego, La Jolla 92093-0636.
Cell
|December 17, 1993
まとめ
新しいホルモン反応性要素 (HRE) は,甲状腺ホルモン (T3) を伴わずに強く活性化し,T3は効果を逆転させる. このユニークな要素は,c-ErbAα受容体の選択的活性化ドメイン使用を示しています.
科学分野:
- 分子生物学は分子生物学である.
- エンドクリノロジー エンドクリノロジー
- ウイルス学 ウイルス学 ウイルス学
背景:
- 古典的なホルモン反応性元素 (HREs) は,受容体活性化のために通常,リガンド結合を必要とします.
- 甲状腺ホルモン (T3) 受容体は,c-ErbAαと同様に,遺伝子調節に関与する核受容体である.
研究 の 目的:
- 新しいHRE,RSV-T3REと,甲状腺ホルモン受容体との相互作用を特徴づける.
- c-ErbAααのリガンド依存および独立した活性化メカニズムを調査する.
主な方法:
- レポーター遺伝子解析は,転写活性化を測定する.
- 受容体-DNAの相互作用と形状の変化の分析.
- c-ErbAアルファ活性化ドメインの変異分析.
主要な成果:
- RSV-T3REは,c-ErbAαによる強力なリガンド独立活性化を媒介し,T3.3によって逆転する.
- c-ErbAアルファホモダイマーとc-ErbAアルファ/レチノイドX受容体 (RXR) ヘテロダイマーがRSV-T3REを活性化します.
- リンガンド依存の活性化にはN端末ドメインが必要で,リンガンド依存の活性化にはC端末ドメインが必要である.
結論:
- RSV-T3REは,ユニークな規制特性を有するHREの新しいクラスを表しています.
- c-ErbAαは,HREとリガンドの状態に基づいて選択的活性化ドメイン展開を示しています.
- この発見は,甲状腺ホルモン受容体機能と遺伝子調節に関する新しい洞察を提供します.
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