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Updated: Mar 15, 2026

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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
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p53 と SET の間のアセチル化調節相互作用は,広範囲にわたる調節モードを明らかにします
Donglai Wang1, Ning Kon1, Gorka Lasso2
1Institute for Cancer Genetics, Department of Pathology and Cell Biology, Herbert Irving Comprehensive Cancer Center, College of Physicians & Surgeons, Columbia University, 1130 Nicholas Ave, New York, NY 10032, USA.
Nature
|September 15, 2016
まとめ
オンコタンパク質SETは,アセチル化されていないp53に結合し,その活性を抑制する. ストレス誘発によるp53CTDのアセチル化は,この結合を破壊し,p53を活性化し,腫瘍の回帰につながり,新しい調節メカニズムを明らかにします.
科学分野:
- 生物化学
- 分子生物学
- エピジェネティクス
背景:
- リン酸エステル化は,タンパク質の機能を調節する重要な翻訳後の変化である.
- タンパク質の相互作用と機能におけるp53 (TP53とも呼ばれる) のC末端領域 (CTD) アセチル化の役割は,まだ完全に理解されていません.
- ブロモドメインタンパク質は,アセチル化ライシン残基の"読者"として知られています.
研究 の 目的:
- 結合がCTDアセチル化状態に依存するp53の新種のタンパク質インタラクタを特定する.
- オンコタンパク質SETがp53の活性を調節するメカニズムを解明する.
- p53媒介による腫瘍抑制におけるアセチル化依存相互作用の役割を特徴づける.
主な方法:
- プロテオミックスクリーニングでp53相互作用タンパク質を特定する.
- タンパク質とタンパク質の相互作用と転写活動の評価のための生化学的測定.
- ネズミの異種移植とノックインモデルを用いた in vivo 研究
主要な成果:
- オンコタンパク質SETは主要なp53相互作用タンパク質で,その結合はp53CTDアセチル化によって調節される.
- SETは非ストレス細胞におけるp53の転写活動を抑制するが,この抑制はストレス誘発のp53CTDアセチル化によって廃止される.
- SET- p53の相互作用が失われるとp53が活性化され,in vivoでは腫瘍が衰退する.
- SETの酸性ドメインは,アセチル化されていないp53CTDの"読者"として作用し,これはブロモドメインの読者とは異なるメカニズムである.
結論:
- SETのような酸性ドメインを含むタンパク質は,アセチル化に依存する新種のレギュレータとして機能する.
- p53CTDのアセチル化は,SETおよび他の酸性ドメインを含むレギュレータ (例えば,VPRBP,DAXX,PELP1) との相互作用を調節する.
- このアセチル化に依存する調節メカニズムは,p53機能と腫瘍抑制に重要な役割を果たします.
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