茶色脂肪のミトコンドリアにおける脂肪酸依存性UCP1解離のメカニズム
Andriy Fedorenko1, Polina V Lishko, Yuriy Kirichok
1Department of Physiology, University of California San Francisco, UCSF Mail Code 2140, Genentech Hall Room N272F, 600 16th Street, San Francisco, CA 94158, USA.
Cell
|October 16, 2012
まとめ
ミトコンドリア解離タンパク質1 (UCP1) は,脂肪酸アニオン/陽子のシンポーターとして作用する. このメカニズムは,茶色脂肪ミトコンドリアがATPの代わりに熱を生成し,代謝効率を調節することを可能にします.
科学分野:
- ミトコンドリア生理学 ミトコンドリア生理学
- バイオケミストリー バイオケミストリー
- 細胞の代謝は細胞の代謝である.
背景:
- ミトコンドリア解離タンパク質1 (UCP1) は,茶色脂肪組織 (BAT) での非シビング熱生成を駆動する.
- 長鎖脂肪酸 (LCFA) によるUCP1の活性化により,ミトコンドリア内膜 (IMM) の伝導性が増加し,ATP合成からの熱生成が分離されます.
- UCP1を媒介する陽子輸送の正確なメカニズムは未解決のままである.
研究 の 目的:
- UCP1.1 のトランスポートメカニズムを解明する.
- LCFAsが熱生成のためのUCP1をどのように活性化するかを決定する.
主な方法:
- UCP1電流の直接パッチクランプ測定は,BATミトコンドリア内部のミトコンドリア膜に実施されました.
- UCP1のLCFAと陽子輸送との相互作用の分析.
主要な成果:
- UCP1は長鎖脂肪酸アニオン/H(+) シンポーターとして機能する.
- LCFAアニオンは,水害性相互作用によりUCP1に結合し,UCP1がH ((+) キャリアとして作用することを可能にします.
- このLCFAに依存するメカニズムは,膜を越えた陽子輸送を容易にする.
結論:
- UCP1は,LCFAで活性化された陽子運搬体として機能し,シフトしない熱生成に不可欠です.
- この発見は,UCP1の輸送メカニズムに関する長年の疑問を解決している.
- 同様のメカニズムは,SLC25ファミリーメンバーを介して他の組織における代謝効率を調節する可能性があります.
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