由工程性乙转移酶诱导的线粒体超乙化促进细胞衰老
Tadahiro Shimazu1, Ayane Kataoka1, Takehiro Suzuki2
1Cellular Memory Laboratory, RIKEN Cluster for Pioneering Research, Wako, Saitama 351-0198, Japan.
iScience
|August 18, 2025
概括
研究人员设计了一种线粒体乙转移酶 (eMAT) 来控制蛋白质乙化. 这种酶诱导了线粒体超乙化,抑制了新陈代谢和促进衰老,但SIRT3抵消了这些影响.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 代谢学 代谢学 代谢学
背景情况:
- 蛋白质乙化对于细胞功能至关重要,特别是线粒体代谢.
- 由于缺乏已识别的乙转移酶,对线粒体乙化缺乏了解.
- 已知Sirtuin 3 (SIRT3) 能够去乙线粒体蛋白质.
研究的目的:
- 设计线粒体局部化的乙转移酶,以研究蛋白质乙化在线粒体功能中的作用.
- 探索诱导线粒体超乙化的生理相关性和功能后果.
主要方法:
- 工程性乙转移酶 (eMAT) 的开发和线粒体矩阵定位.
- 全球蛋白质组分析以确定eMAT介导的乙化位点.
- 评估细胞表型,包括能量代谢,细胞生长和衰老.
主要成果:
- eMAT在线粒体基质中成功诱导了全球蛋白质氨酸乙化,准了413种蛋白质.
- 基于eMAT的乙化模式与之前识别的乙化部位有显著的重叠,证实了生理相关性.
- 诱导的超乙化对线粒体能量代谢和细胞生长产生了负面影响,同时促进了细胞衰老.
- 证明SIRT3活性可以逆转eMAT诱导的超乙化,恢复新陈代谢功能,并防止衰老.
结论:
- 工程化线粒体乙转移酶 (eMAT) 为研究线粒体乙化提供了一个工具.
- 线粒体超乙化抑制能量代谢,并驱动细胞衰老.
- 通过抵消超乙化和防止衰老,SIRT3在维护线粒体平衡中发挥着至关重要的作用.
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