核NADHによるコアプレッサー機能の調節
Qinghong Zhang1, David W Piston, Richard H Goodman
1Vollum Institute, Oregon Health Sciences University, 3181 SW Sam Jackson Park Road, Portland, OR 97201, USA.
Science (New York, N.Y.)
|February 16, 2002
まとめ
カーボキシル末端結合タンパク質 (CtBP) は,再酸化センサーとして作用し,その結合はNAD+/NADH比によって調節される. このメカニズムは遺伝子転写に影響を与え,発達や細胞周期調節などの細胞プロセスに影響を与えます.
科学分野:
- 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
- 細胞生物学 細胞生物学
背景:
- カーボキシル末端結合タンパク質 (CtBP) は,転写調節に不可欠なコアプレッサーである.
- CtBPは,発達,細胞サイクル制御,細胞変容において役割を果たします.
- CtBPの正確な規制メカニズム,特に転写抑制剤との相互作用は完全に理解されていません.
研究 の 目的:
- ニコチナミドアデニン・ディヌクレオチド (NAD+とNADH) が,CtBPが転写抑制剤に結合する調節における役割を調査する.
- 核NAD+/NADHのインビボ濃度とそのCtBP活動との相関を決定する.
- セルラー・レドックスセンサーとしてのCtBPの可能性を調査する.
主な方法:
- 2フォトン顕微鏡を用いて,自由核のNAD+/NADHレベルを測定した.
- 異なるNAD+/NADH濃度に応じて,細胞およびウイルス抑制剤へのCtBP結合を評価した.
- CtBP媒介による抑制にNADHレベルを調節する薬剤の効果を研究した. in vivo.
主要な成果:
- 転写抑制剤へのCtBP結合はNAD+とNADHによって調節され,NADHはより強力である.
- 半最大CtBP結合に必要な測定された核NAD+/NADHレベルは,以前に報告されたより低い.
- in vivoでNADHレベルを上昇させると,CtBP結合が強化され,CtBP媒介の転写抑制が強化される.
結論:
- CtBPは,レドックスセンサーとして機能し,NAD+/NADH比を利用して,転写パートナーとの相互作用を調節します.
- この発見は,細胞のリドックス状態と転写制御を結びつける,CtBPのための新しい規制メカニズムを明らかにしています.
- これは,基本的な細胞プロセスと疾患状態におけるCtBPの役割についての洞察を提供します.
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