Fas-FADD死亡領域複合体の構造は,受容体クラスタリングによるシグナル伝達を解析する
Fiona L Scott1, Boguslaw Stec, Cristina Pop
1Program in Apoptosis and Cell Death Research, The Burnham Institute for Medical Research, La Jolla, California 92037, USA.
Nature
|January 2, 2009
まとめ
Fas受容体とFADDの相互作用は,アポトーシスの決定的な死亡誘発信号複合体 (DISC) を形成します. 構造分析は,プログラムされた細胞死のための分子スイッチとして作用する規制Fas-FADD複合ブリッジを明らかにします.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 構造生物学 構造生物学とは
背景:
- 死を誘発するシグナリング複合体 (DISC) は,アポトーシスの開始に不可欠です.
- DISCの形成は,Fas受容体とFADD (Fas関連死亡領域タンパク質) の相互作用に依存しています.
- Fas-FADDの相互作用に関する構造データは不足しており,メカニズム的な理解を妨げています.
研究 の 目的:
- DISC内のFas-FADD相互作用の構造的基礎を特徴づけること.
- DISCの組立と調節のメカニズムを解明する.
主な方法:
- 人間のFas-FADD死亡領域複合体の形成と分離.
- X線結晶学で2.7 Åの結晶構造を決定する.
主要な成果:
- 結晶構造は,4つのFADD死亡領域と4つのFas死亡領域に結合した4つのFADD死亡領域のテトラメリック複合体を明らかにします.
- Fas死亡ドメインの開口はFADD結合部位を露出させ,Fas-Fasブリッジを形成する.
- 弱い相互作用によって支配される規制性Fas-FADD複合ブリッジは,分子スイッチとして作用する.
結論:
- Fas-FADD複合体は機械的なスイッチとして機能し,早期のDISC組立を防止しながら,刺激時に効率的な形成を可能にします.
- この研究は,新しい死領域相互作用の様式と,オリゴメリゼーションとクラスタリングによる受容体シグナル伝達のメカニズムを明らかにしています.
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