Bcl2と相互作用するタンパク質であるBidは,細胞表面死受容体の活性化に反応して,ミトコンドリアからシトクロームcの放出を媒介する
関連する実験動画
Updated: May 5, 2026

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Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c
Published on: June 29, 2011
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1Howard Hughes Medical Institute and Department of Biochemistry, University of Texas Southwestern Medical Center at Dallas, 75235, USA.
Cell
|September 4, 1998
まとめ
この研究は,アポプトシス信号を伝達する重要なタンパク質であるBidを特定しています. Bidのカスパース8分裂は,ミトコンドリアからシトクロームcの放出を誘発し,プログラム細胞死を開始します.
科学分野:
- 細胞生物学 細胞生物学
- 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:
- 細胞表面死受容体はアポトーシスを開始する.
- カスパース-8は,これらの受容体によって活性化されるアピカルカスパースです.
- ミトコンドリア外膜浸透 (MOMP) は,アポトーシスの重要なステップです.
研究 の 目的:
- サイトクロームcの放出を媒介する細胞性タンパク質を特定する.
- アポプトシス経路におけるビッドの役割を明らかにする.
- ビード誘発のMOMPのメカニズムを理解する.
主な方法:
- 細胞抽出物からタンパク質を浄化する.
- タンパク質の識別のためのペプチド質量指紋.
- 免疫衰弱検査 免疫衰弱検査 免疫衰弱検査 免疫衰弱検査
- Bid クリーバージとトランスロケーションの分析.
- サイトクロームcの放出に関する機能分析.
主要な成果:
- サイトクロームcの放出を誘導する細胞性タンパク質が浄化し,Bid.として特定されました.
- Caspase-8はBidを分裂させ,COOH末端の断片はミトコンドリアに転位する.
- Bidはシトクロームcの放出を誘発し,このプロセスはBcl2.0によって阻害されます.
- BidのBH3ドメインの突然変異により,その活性が低下した.
結論:
- Bidは,アポプトシス信号を死亡受容体からミトコンドリアに伝達する重要な仲介者として機能します.
- バイド誘発のシトクロームc放出は,固有のアポプトシス経路における重要なイベントです.
- Bidの機能は,カスパース-8の分裂とBcl2との相互作用によって調節される.
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