3-CaN-Smurf1复合物扣留FLCN-FNIPs,以促进TFEB激活,以应对内膜损伤
Qin Xia1, Ziwan Liu1, Gaoqing Feng1
1State Key Laboratory of Hearing and Balance Science and Key Laboratory of Molecular Medicine and Biological Diagnosis and Treatment (Ministry of Industry and Information Technology), Aerospace Center Hospital, Advanced Technology Research Institute, Tangshan Research Institute, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|September 17, 2025
概括
通过溶酶体损伤激活Smurf1会破坏FLCN-FNIP复合体,损害mTOR介导的TFEB酸化,并促进TFEB激活细胞平衡. 这揭示了癌症的新型治疗点.
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:
- Smurf1通过Gal3-CaN-Smurf1复合体调解 lysosomal生物发生和TFEB脱.
- 此前,Smurf1在抑制mTOR介导的TFEB酸化中的作用尚不清楚.
- mTORC1依赖的TFEB酸化依赖于FLCN-FNIP复合体.
研究的目的:
- 为了研究Smurf1在调节mTOR介导的TFEB酸化在溶酶体损伤时的作用.
- 阐明Smurf1影响FLCN-FNIP复合体和TFEB激活的机制.
- 探索向癌症中的Smurf1-mTOR-TFEB轴的治疗潜力.
主要方法:
- 同免疫沉试验用于研究蛋白质相互作用.
- 西方涂抹用于评估蛋白质酸化和无处不在.
- 免疫光显微镜以确定TFEB局部化.
主要成果:
- Smurf1促进了RagC与TFEB的解离,在溶酶体损伤时损害了TFEB的酸化.
- 该Gal3-CaN-Smurf1复合体封存FLCN-FNIPs,破坏FLCN的GTPase激活蛋白的功能.
- Smurf1直接使TFEB无处不在,从而促进其脱和激活.
- 在FLCN和FNIP2中的突变会影响它们与Gal3-CaN-Smurf1复合体的结合.
结论:
- 该Gal3-CaN-Smurf1复合体与FLCN-FNIPs集成,以控制在溶酶体应激期间的TFEB活性.
- 在对内膜损伤的反应中,Smurf1在调节TFEB局部化和激活方面发挥着关键作用.
- 针对mTOR-TFEB通路的Smurf1调节,为癌症治疗提供了潜在的治疗策略.
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