PINK1によるパーキン活性化のメカニズム

Christina Gladkova¹, Sarah L Maslen¹, J Mark Skehel¹

¹Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.

Nature

|July 12, 2018

まとめ

幼年期パーキンソン病の予防に不可欠なパーキンタンパク質の活性化には,大規模なドメインの再編成が含まれています. このプロセスは触媒領域を解放し治療薬の設計に新たな標的を提供します

科学分野:

生物化学
分子生物学
神経科学

背景:

パルキン (PARK2/PRKN) とPINK1 (PARK6) の突然変異は,自己相性後退性若年性パーキンソン病 (AR- JP) を引き起こします.
これらの変異は損傷したミトコンドリアを分解するプロセスであるミトファギーの細胞欠陥につながります
パルキンはE3ユビキチンリガゼで,活性化にはPINK1媒介によるリン酸化が必要ですが,そのメカニズムは不明です.

研究の目的:

PINK1によるパーキン活性化の分子メカニズムを解明する.
パルキンの自己抑制がリン酸化で解消される方法を理解するために
AR-JPの潜在的治療標的を特定する.

主な方法:

水素-デュテリウム交換質量スペクトロメトリー (HDX-MS) で,全長パーキン活性化を追跡する.
リン酸化ヒトパルキンの結晶構造の決定.

主要な成果:

HDX-MSは,パーキン活性化中に大規模なドメインの再編成を明らかにした.
酸化されたユビキチンのようなドメイン (フォスフォ-Ubl) は,パーキン核に再結合し,触媒RING2ドメインを放出する.
結晶構造は,独特のパーキン領域 (UPD) のフォスフォ-Ubl結合部位を特定し,活性化要素 (ACT) リンク器領域を明らかにした.

結論:

パーキン活性化には,触媒RING2ドメインを解放する重要なドメイン再配置が含まれます.
AR-JP変異は,フォスフォ-Ubl結合部位とACTリンクヤーに集まって,疾患の関連性を説明する.
発見は,パーキン基板のユビキチン化のためのメカニズムを提供し,パーキン活性化剤の設計のための戦略を提案する.

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