SIRT1は,PER2脱エチル化による昼夜時計の遺伝子発現を調節する
Gad Asher1, David Gatfield, Markus Stratmann
1Department of Molecular Biology, Sciences III, University of Geneva, 30, Quai Ernest Ansermet, CH-1211 Geneva-4, Switzerland.
Cell
|July 30, 2008
まとめ
SIRT1は,タンパク質脱酸化酵素であり,昼夜リズム転写に不可欠です. CLOCK-BMAL1と相互作用し,PER2の分解を促進し,代謝を体と結びつけ,コアクロック遺伝子を調節する.
科学分野:
- クロノバイオロジーはクロノバイオロジーを用います.
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- 哺乳類の昼夜計時システムは,BMAL1やCLOCKのような転写因子を含む分子フィードバックループに依存しています.
- ピリオド (Per) とクリプトクローム (Cry) の遺伝子はBMAL1-CLOCKによって活性化され,それらのタンパク質は複合体を形成して自身の転写を抑制します.
研究 の 目的:
- 核心の昼夜時計遺伝子の調節における,NAD (((+)) に依存するタンパク質,SIRT1のデセチラゼの役割を調査する.
- SIRT1が昼間の転写とタンパク質の安定性を影響するメカニズムを解明する.
主な方法:
- 核心時計遺伝子 (Bmal1,Rorgamma,Per2,Cry1) の昼間トランスクリプションに対するSIRT1の要求を調査した.
- SIRT1のCLOCK-BMAL1ヘテロダイマーとの結合を昼夜にわたって調べました.
- PER2の脱エチル化と分解に対するSIRT1の影響を評価した.
主要な成果:
- SIRT1は,Bmal1,Rorgamma,Per2,Cry1.1を含む主要なクロック遺伝子の高幅の昼夜間トランスクリプションに不可欠です.
- SIRT1は時間に依存した方法でCLOCK-BMAL1と相互作用する.
- SIRT1は,PER2タンパク質の脱エチル化およびその後の分解を促進します.
結論:
- SIRT1は,昼間の遺伝子発現の幅を調節する上で重要な役割を果たします.
- SIRT1は,コアクロックメカニズム内のPER2タンパク質の安定性に直接影響を与えます.
- SIRT1のNAD (((+) 依存性活動は,細胞代謝と中央日経時計の間の直接的なリンクを示唆しています.
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