Cullin-3アダプターSHKBP1はSQSTM1/p62オリゴマー化とKeap1隔離を阻害する
Lin Luan1,2, Xiaofu Cao1,3, Zijun Xia1,3
1Weill Institute for Cell and Molecular Biology, Cornell University , Ithaca, NY, USA.
The Journal of cell biology
|February 6, 2026
まとめ
SHKBP1はp62ボディ形成を調節し、ユビキチン化に依存せずに抗酸化応答に影響を与える。この発見は、タンパク質間相互作用を介した細胞ストレス応答の制御に関する新たなメカニズムを明らかにする。
科学分野:
- 細胞生物学
- 分子生物学
- 生化学
背景:
- SQSTM1/p62は、オートファジーとユビキチン化を介したタンパク質分解に不可欠であり、抗酸化応答を調節する。
- p62は細胞質内のp62ボディを形成するが、これはその機能に不可欠な相分離構造である。
- p62ボディ形成とダイナミクスを制御するメカニズムは完全には理解されていない。
研究 の 目的:
- p62オリゴマー化とp62ボディ形成の新規調節メカニズムを特定する。
- cullin-3 E3ユビキチンリガーゼアダプターであるSHKBP1のp62調節における役割を調査する。
- SHKBP1を介したp62調節が、細胞の抗酸化応答に与える影響を解明する。
主な方法:
- SHKBP1とp62間のタンパク質間相互作用マッピング。
- SHKBP1存在下でのp62ボディ形成とダイナミクスの分析。
- Keap1の隔離とNrf2の核内移行を含む細胞の抗酸化応答経路の評価。
主要な成果:
- SHKBP1はp62ボディ外でp62と直接相互作用する。
- この相互作用はp62オリゴマー化を阻害し、p62ボディへの取り込みを制限する。
- SHKBP1を介したp62ボディの調節は、Keap1の隔離とNrf2の活性化に影響を与えることにより、抗酸化応答に影響を与える。
結論:
- SHKBP1は、ユビキチン化に依存しないメカニズムを介してp62ボディ形成を調節する。
- この経路は、E3リガーゼアダプターと細胞の酸化ストレス応答の調節との間に新規な関連性を提供する。
- この発見は、p62を介した細胞シグナル伝達に対する新たな制御層を明らかにする。
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