库林-3适配器SHKBP1抑制了SQSTM1/p62的寡合化和Keap1的分离
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
概括
SHKBP1调节p62体的形成,影响抗氧化剂反应独立于ubiquitination. 这一发现揭示了一种通过蛋白质相互作用控制细胞应激反应的新机制.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- SQSTM1/p62对于蛋白质通过自和无化降解至关重要,并调节抗氧化反应.
- p62形成了细胞质p62体,这是其功能必不可少的相隔结构.
- 控制p62体形成和动态的机制尚未完全理解.
研究的目的:
- 确定p62寡合化和p62体形成的新型调节机制.
- 为了研究SHKBP1的作用,一个库林-3 E3泛基因酶适配器,在p62调节中.
- 阐明SHKBP1-介导的p62调节对细胞抗氧化反应的影响.
主要方法:
- 在SHKBP1和p62.2.之间的蛋白质-蛋白质相互作用映射.
- 在SHKBP的存在下分析p62体的形成和动态1.
- 评估细胞抗氧化剂反应途径,包括Keap1封存和Nrf2核转位.
主要成果:
- 在p62体外,SHKBP1与p62直接相互作用.
- 这种相互作用抑制了p62的寡合化,并限制了它被纳入p62体.
- 通过SHKBP1调节p62体,通过影响Keap1封存和Nrf2激活,影响抗氧化反应.
结论:
- SHKBP1通过一种不依赖于ubiquitination的机制调节p62体的形成.
- 这一途径提供了E3酶适配器与细胞氧化应激反应调节之间的新联系.
- 这些发现揭示了对p62介导的细胞信号传输的新一层控制.
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