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多価相互作用によるBPTFによる単核細胞ヒストンの改変パターンの認識.
Alexander J Ruthenburg1, Haitao Li, Thomas A Milne
1Laboratory of Chromatin Biology and Epigenetics, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, USA.
Cell
|May 21, 2011
まとめ
ヒストンの改変の組み合わせは,クロマチンの機能の鍵です. この研究は,核細胞にタンパク質結合を誘導するヒストンマーク (H3K4me3およびH4K16ac) の特定のパターンを特定した.
科学分野:
- クロマチンの生物学
- 分子エピジェネティクス
- タンパク質とDNAの相互作用
背景:
- ヒストンの改変は遺伝子発現とクロマチンの構造を調節する.
- BPTFタンパク質のPHD指はメチル化ヒストンH3 (H3K4me2/3) を認識する.
- 結合ヒストーンマークが核細胞レベルでタンパク質結合にどのように影響するかは,ほとんど不明である.
研究 の 目的:
- 追加のヒストンの改変がBPTF結合にどのように影響するかを調査する.
- BPTFによって認識される特定のヒストンマークの組み合わせを特定するために.
- クロマチンの関連性におけるヌクレオソームマークパターニングの役割を理解する.
主な方法:
- ペプチドサロゲートの体系的なスクリーニング.
- タンパク質-リガンドの相互作用の生体物理的特徴.
- モノヌクレオソーム結合測定法.
- ゲノム全体のコロカライゼーション分析.
主要な成果:
- BPTFのPHD付近のブロモドメインは,3つのアセチリリシンペプチドと結合することが確認された.
- BPTFブロモドメインは,H4K16acに対して選択性を示したのは,H3K4me3と組み合わせたときのみで, mononucleosomeレベルであった.
- このH3K4me3とH4K16acのパターンは,ヒト細胞の単一の核細胞内のユニークなトランスヒストンの改変であると確認されました.
- この特定のヒストンマークモジュールは,ゲノム内のBPTF結合部位とコロカライズします.
結論:
- コバレントマークの核体パターンは,重要なクロマチンの関連性を決定する.
- H3K4me3とH4K16acの組み合わせは,単一の核分裂体において,BPTFの特定の認識信号である.
- この発見は,クロマチンの調節を理解するために,複数のヒストーンマークの相互作用を考慮することの重要性を強調しています.
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