エンハンサーの活性化には,メガ転写因子複合体のトランスリクルートが必要である
Zhijie Liu1, Daria Merkurjev2, Feng Yang1
1Howard Hughes Medical Institute, Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA 92093, USA.
Cell
|October 11, 2014
まとめ
強力な増強剤は,メガトランス増強剤と呼ばれる大きなタンパク質複合体を採用して,細胞特異的な遺伝子活性を駆動します. この発見は,トランスクリプション因子が,細胞の重要なプログラムを調節するために,どのように集まっているかを説明します.
科学分野:
- 分子生物学は分子生物学である.
- ゲノミクスゲノミクスとは
- エピジェネティクス エピジェネティクス
背景:
- 増強剤は,転写因子結合を通じて細胞特異の遺伝子発現を調節する.
- エストロゲン (E2) 応答要素 (ERE) は,E2反応性遺伝子の重要な規制部位である.
研究 の 目的:
- 最も強く活性化されたエストロゲン反応性増強剤の基礎にある分子機構を調査する.
- これらの強力な強化剤で組み立てられた大きなタンパク質複合体を特徴付けるために.
主な方法:
- エストロゲン反応性増強剤とその関連するタンパク質複合体の分析.
- 組み立てられた転写因子複合体の構成と機能の識別.
主要な成果:
- 最も活性化されたE2反応性増強剤は,メガトランス増強剤と呼ばれる多様な転写因子の大きな (1-2 MDa) 複合体を採用します.
- メガトランス複合体は,エンハンサーRNA転写とコアクティベーター募集 (p300,Med1) に不可欠である.
- これらの複合体は,DNA依存タンパク質キナーゼのような酵素機構を勧誘する.
結論:
- メガトランス強化剤は,強力な機能強化剤の独特なクラスを表しています.
- メガトランス複合体は,観察された転写因子クラスタリングとゲノムホットスポットのための分子基盤を提供します.
- このメカニズムは,広範囲で重要な転写プログラムを媒介する.
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