デュアルリングE3アーキテクチャは,APC/Cによるマルチウビキチンとウビキチン鎖の延長を制御する
Nicholas G Brown1, Ryan VanderLinden2, Edmond R Watson1
1Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
Cell
|June 4, 2016
まとめ
アナフェーズ促進複合体/サイクロソーム (APC/C) は,タンパク質のユビキチン化を制御するために異なるE2酵素アーキテクチャを使用する. 特殊な構造により,マルチユビキチン化と結合特有のポリユビキチン鎖の延長が可能である.
科学分野:
- 分子生物学
- 生物化学
- 構造生物学
背景:
- タンパク質のユビキチン化は,E1,E2,E3酵素によって調節される重要な翻訳後の変化である.
- E2およびRING E3リガゼは,ユビキチン化基質に協力し,マルチユビキチン化またはポリユビキチン鎖の延長につながります.
研究 の 目的:
- ヒトのE3アナフェーズ促進複合体/サイクロソーム (APC/C) とそのE2パートナーであるUBE2CとUBE2Sの特殊な触媒構造を解明する.
- APC/C-E2の相互作用によって,異なる形態のポリウビキチネーションが決定されるメカニズムを定義する.
主な方法:
- 高解像度構造を決定するための冷凍電子顕微鏡 (冷凍EM).
- 酵素活性と基質の相互作用を分析する生化学的測定法
主要な成果:
- APC/C RINGは,UBE2Cを基板と基板に結合したユビキチンに近い位置に置き,プロセシブマルチユビキチン化に制限する.
- 鎖の延長では,APC/C RINGは,進化する基質結合ユビキチンをキャプチャするために,クリン相互作用を通じてUBE2Sを位置づけることで,Lys11結合鎖の形成を促進します.
結論:
- 特殊なE3-E2基板-ユビキチンアーキテクチャは,異なるポリユビキチン化経路を支配する.
- これらの発見は,APC/Cの調節とポリウビキチネーションの制御の新しいメカニズムを明らかにしています.
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