基拉尼尔基拉尼化SCFFBXO10 调节了选择性的外线粒体膜蛋白质稳定和功能.
Sameer Ahmed Bhat1, Zahra Vasi1, Liping Jiang1
1Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, MBRB 1252, Chicago, IL 60607, USA.
Cell reports
|September 22, 2024
概括
FBXO10蛋白通过geranylgeranylation向外层线粒体膜,调节线粒体功能和蛋白质稳定. 这种机制对于细胞健康和肌原分化至关重要.
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:
- 细胞膜蛋白的循环,特别是在特定的区间,如外层线粒体膜 (OMM),仍然不太了解.
- 控制线粒体内的蛋白质定位和功能的精确机制对于细胞能量生产和恒温至关重要.
研究的目的:
- 阐明FBXO10针对OMM的机制.
- 研究FBXO10在线粒体功能和蛋白质稳定中的作用.
- 为了确定FBXO10活动的基板和下游效应.
主要方法:
- 研究的蛋白质脂质修饰 (geranylgeranylation) 的FBXO10在氨酸953.
- 用于OMM向的细胞系因子 (PDE6δ,HSP90) 的蛋白质相互作用研究.
- 使用FBXO10突变体 (C953S) 来评估线粒体功能 (ATP产生,膜潜力,碎片化).
- 应用比较定量蛋白质组学来识别线粒体基质.
- 评估了对蛋白质降解 (PGAM5),线粒体平衡和iPSC和肌体细胞中的肌原分化的影响.
主要成果:
- FBXO10在C953处经历基拉尼尔基拉尼化,通过与PDE6δ和HSP90.0的相互作用调解其OMM局部化.
- 突变FBXO10 (C953S) 突变显示OMM向受损,线粒体ATP产生减少,膜潜能丧失和碎片化增加.
- 糖酸突变酶-5 (PGAM5) 被确定为FBXO10.0的OMM局部化基质.
- 缺乏FBXO10或缺乏前化突变抑制了PGAM5降解,破坏了线粒体平衡,并损害了肌体差异化.
结论:
- 基拉尼尔基拉尼化是FBXO10 OMM准和功能的一个关键机制.
- FBXO10通过PGAM5降解调节线粒体蛋白质稳定,影响细胞能量和分化.
- 这一途径代表了线粒体功能障碍的潜在治疗标.
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