CUE-ユビキチン複合体の溶液構造は,ユビキチン結合の保存モードを示しています

Richard S Kang¹, Cynthia M Daniels, Smitha A Francis

¹Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, IL 60208, USA.

Cell

|June 6, 2003

まとめ

モヌビキチネーション信号は,ウビキチン結合モチーフによって調節されます. CUEドメインはCUEドメインです.

科学分野:

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
構造生物学構造生物学とは

背景:

モヌビキチネーションは,細胞の重要な調節信号である.
ウビキチン結合モチーフは,モノウビキチン信号伝達を媒介する.
CUEドメインのようないくつかのモチーフは,分子内モノウビキチン化も促進する.

研究の目的:

CUEドメインによるユビキチン認識の構造的基礎を解明する.
CUEドメインがモノウビキチネーションを調節するメカニズムを理解する.
CUEドメインが他のユビキチン結合タンパク質のパラダイムとして機能する可能性を調査する.

主な方法:

酵母 Cue2 CUEドメインの溶液構造の決定,ユビキチンとの複合体.
分子間相互作用と保全された水性表面の分析.
UBAドメインとubiquitin.comの相互作用の比較モデリング

主要な成果:

構造は,CUEドメインとユビキチンとの間の特定の分子間相互作用を明らかにします.
ユビキチンに保存された水性パッチ (Leu8-Ile44-Val70) が結合に関与しています.
結合部位はLys48まで広がっており,ポリユビキチン鎖の形成を抑制するメカニズムを示唆しています.

結論:

CUEドメイン構造は,モノウビキチンシグナル伝達に関する洞察を提供します.
閉塞メカニズムは,ポリユビキチン鎖の形成を防ぐ可能性が高い.
CUEドメインは,UBAドメインやその他の関連するタンパク質によるユビキチン認識の構造モデルとして機能する可能性があります.

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