純粋 な タンパク質 で 再構成 さ れ た ゲノム の 核 細胞 組織
Nils Krietenstein1, Megha Wal2, Shinya Watanabe3
1Molecular Biology Division, Biomedical Center, LMU Munich, 82152 Planegg-Martinsried near Munich, Germany.
Cell
|October 22, 2016
まとめ
この研究は,特定のタンパク質が遺伝子プロモーターで核細胞をどのように組織するかを明らかにするために,クロマチンの改造を再構成します. RSC,INO80,ISW2などの改造剤が遺伝子調節における直接的な役割を明らかにした.
科学分野:
- 分子生物学
- 遺伝学
- 生物化学
背景:
- クロマチンのリモデレータは ニュクレオソームを組織することで 遺伝子調節に不可欠です
- イン・ビボの研究は,因子の冗長性と間接的な影響のために複雑です.
- 精製されたタンパク質で 核細胞組織を再構成することで より明確なアプローチができます
研究 の 目的:
- クロマチンリモデレータがプロモーター核細胞組織に与える個々の貢献を解明する.
- プロモータークロマチンの構造を制御する最小限の規則とタンパク質を確立する.
主な方法:
- 精製された酵母ゲノムDNA,ヒストン,および配列特異的因子 (Abf1/Reb1) を使用したプロモーター核細胞組織の全ゲノム再構成.
- クロマチンの改造剤の組み込み:RSC,ISW2,INO80,ISW1a
- in vivoの観察で in vitroの発見を検証する.
主要な成果:
- RSC (Remodeler-Substrate Complex) は,プロモーターから,特にポリ (dA:dT) 領域から核細胞の除去を指示する.
- INO80とISW2は, +1核群の位置づけに部分的な冗長性を示しています.
- INO80とISW2は独立して核細胞配列を並べている.
- ISW1aは,核細胞の規則的な距離を確立する機能を持っています.
結論:
- 核細胞組織へのリモデラーの直接的,特定の,十分な貢献が特定されました.
- プロモータークロマチンのアーキテクチャは,クロマチンのリモデレータの特化機能と冗長機能の組み合わせから生じる.
- この再構成されたシステムは 遺伝子調節の基本的な仕組みを理解するための枠組みを提供します
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