Bcl-2は,タンパク質キナーゼRaf-1をミトコンドリアに標的にする
1The Burnham Institute, Program on Apoptosis and Cell Death Research, La Jolla, California 92037, USA.
Cell
|November 15, 1996
まとめ
Bcl-2タンパク質は,Raf-1キナーゼをミトコンドリアに標的とし,BADをリン酸化することによって細胞死を防ぐ. このミトコンドリアの局所化は,Bcl-2にとって極めて重要です.
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:
- Bcl-2はアポトーシスの重要な調節体である.
- Raf-1は,細胞シグナル伝達に関与するキナーゼです.
- ミトコンドリアは,プログラムされた細胞死において中心的な役割を果たします.
研究 の 目的:
- Bcl-2がRaf-1キナーゼをミトコンドリアに標的にできるかどうかを調査する.
- アポトーシスの調節におけるRaf-1局所化の役割を決定する.
- Bcl-2がアポトーシス抵抗を媒介するメカニズムを解明する.
主な方法:
- 緑色光タンパク質 (GFP) -Raf-1融合タンパク質を使用しました.
- 外部ミトコンドリア膜標的配列を搭載したRaf-1を設計した.
- アポトーシスから細胞の保護を評価した.
- 分析されたタンパク質のリン酸化 (BAD,ERK-1,ERK-2).
主要な成果:
- Bcl-2はミトコンドリアにGFP-Raf-1融合タンパク質を標的とした.
- ミトコンドリアを標的とする活性Raf-1細胞は,アポトーシスから保護されます.
- ミトコンドリアを標的としたRaf-1リン酸化BAD.
- プラズマ膜を標的としたRaf-1は細胞とリン酸化されたERK-1/ERK-2を保護しなかった.
- 標的化されていない活性Raf-1は,Bcl-2-媒介によるアポトーシス抵抗性を強化した.
- キナーゼ無活性Raf-1変異体は,Bcl-2のアポトーシス抑制を廃止した.
結論:
- Bcl-2は,Raf-1をミトコンドリア膜に標的とする.
- ミトコンドリアのRaf-1はBADをリン酸化し,アポトーシス抵抗に寄与する.
- Raf-1のキナーゼ活性とミトコンドリアの局所化は,Bcl-2の抗アポプトシス機能に不可欠である.
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