MLLファミリーメチルトランスファーゼの活性調節のための構造的基礎
Yanjing Li1,2, Jianming Han1,2, Yuebin Zhang3
1National Center for Protein Science Shanghai, State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 333 Haike Road, Shanghai 201210, China.
Nature
|February 18, 2016
まとめ
研究者らは,RBBP5-ASH2Lが,発達と血液形成における遺伝子調節に不可欠なMLLタンパク質を活性化する方法を発見しました. この発見はヒストンメチルトランスフェラーゼの 制御のための普遍的なメカニズムを示しています
科学分野:
- 生物化学
- 分子生物学
- エピジェネティクス
背景:
- 混合血統白血病 (MLL) タンパク質ファミリーはヒストンのメチル化によって重要な発達および造血遺伝子を調節する.
- MLLタンパク質の活性がWDR5,RBBP5,ASH2Lによって刺激されることは知られていますが,正確な調節メカニズムは不明です.
研究 の 目的:
- RBBP5 と ASH2L がMLLファミリーのヒストンメチルトランスファーゼを調節する分子機構を明らかにする.
- MLL複合体の組立と活動規制における共通テーマと機能的な可塑性を理解する.
主な方法:
- RBBP5-ASH2Lヘテロダイマーの構造分析
- MLLタンパク質の活性化を決定する生化学的測定法
- アクティベーションメカニズムを理解するための計算モデルです.
主要な成果:
- ミニマルのRBBP5-ASH2LヘテロダイマーがMLLファミリータンパク質の活性化の中心構造単位として機能する.
- 2段階のメカニズムは,MLLタンパク質の活性化を説明します.
- ほとんどのヒストンメチルトランスファーゼに適用できる普遍的な規制メカニズムを特定した.
結論:
- RBBP5-ASH2Lヘテロダイマーは,MLLファミリーメチルトランスフェラーゼの活性化に不可欠である.
- この研究は,ヒストンメチルトランスフェラーゼの活性を調節する保存されたメカニズムを示しています.
- 発見は発達と疾患における表遺伝的調節に関する洞察を提供します.
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