RAIDD CARDのソリューション構造と,CASPASE-2とCASPASE-9の採用におけるCARDとCARDの相互作用のモデル
1Committee on Higher Degrees in Biophysics, Harvard University, Cambridge, Massachusetts 02138, USA.
Cell
|August 8, 1998
まとめ
RAIDDのカスパースリクルートドメイン (CARD) 構造は,保存された表面極性を示している. この極性は,CARD/CARDの相互作用において極めて重要であり,アポトーシス中のカスパースの募集を媒介する.
科学分野:
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
- 細胞死経路 細胞死経路について
背景:
- アポトーシス (プログラムされた細胞死) は,同型相互作用を通じてアダプタタンパク質によってカスペスの採用を伴う.
- これらの相互作用は,アダプタのカスパースリクルートドメイン (CARD) とカスパースのプロドメインの間に発生します.
研究 の 目的:
- RAIDDアダプタタンパク質のCARDの3次元構造を決定する.
- カスパーゼ募集における CARD/CARD相互作用の分子メカニズムを解明する.
主な方法:
- X線結晶学を用いて,RAIDDアダプタータンパク質のCARD構造を解明した.
- ホモロジーモデリングは,ICH-1 CARDの構造を予測するために使用されました.
- CARD/CARDの相互作用における表面パッチの役割を調査するために,変異性研究が行われました.
主要な成果:
- RAIDD CARDの構造は6つのヘリクで構成されており,トポロジーはFas死の領域に似ています.
- RAIDD CARDの表面には,明確な塩基性および酸性パッチが表示されます.
- これらの表面の極性はICH-1 CARDで保存され,RAIDDとICH-1の間の相互作用を媒介する.
結論:
- RAIDD CARDの解明された構造は,カスパース募集の分子基盤についての洞察を提供します.
- CARDにおける保存された塩基/酸面の極性性は,CARD/CARDの相互作用の一般的なメカニズムであるようです.
- このメカニズムは,Apaf-1,caspase-9,Ced-4,Ced-3を含む様々なアポトーシス関連のタンパク質の機能に根本的な役割を果たしている可能性が高い.
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