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ATG8結合のUIMタンパク質は,新種のオートファギーアダプターと受容体を定義する
Richard S Marshall1, Zhihua Hua2, Sujina Mali1
1Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, USA.
Cell
|April 9, 2019
まとめ
研究者は,ユビキチン相互作用モチーフ (Ubiquitin-interacting motif,UIM) のような配列を用いて,オートファジー中にATG8/LC3に結合する新しい種類のタンパク質を発見した. この発見は,選択的オートファギーの理解を拡大し,オートファギの膀動力の新しい調節体を特定します.
科学分野:
- 分子生物学
- 細胞生物学
- 生物化学
背景:
- オートファギーは,脂質化されたATG8/LC3経由でファゴフォアに結合したアダプターと受容体に依存する.
- 最も知られているATG8結合タンパク質は,ATG8相互作用モチーフ (AIM/LIR) を使用して,LIR/AIMドッキングサイト (LDS) に結合する.
研究 の 目的:
- 新しいATG8インタラクタを特定し,特徴づけること.
- 選択的自己消化におけるこれらの新しい相互作用体の役割を探求する.
主な方法:
- タンパク質とタンパク質の相互作用をテストする生化学的測定法
- ATG8のインタラクタを特定する 偏りのないスクリーン
- ユビキチン相互作用モチーフ (UIM) のような配列とユビキチン調節X (UBX) ドメインを持つタンパク質の分析.
主要な成果:
- 代替ATG8サイトへの高親和結合のためのUIMのような配列を使用するATG8インタラクターの新しいクラスが特定されました.
- これらのUIMベースのインタラクタは 植物,酵母,そして人間で見つかりました
- UBXドメインを持つUIMを含むタンパク質のサブセットは,UIM指向の自己消化による非機能的なCDC48/p97複合体の除去に関与した.
結論:
- ATG8結合のための新しいメカニズムとしてUIM類似の配列の発見は,選択的オートファギアアダプタと受容体のレパートリーを大幅に拡張します.
- この研究は,オートファージの膀動態を調節する新しい要因を特定し,CDC48/p97を含む疾患メカニズムについての洞察を提供します.
- この発見は,選択的自己消化とその規制ネットワークの範囲を広げています.
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