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KEAP1的传感器系统能够在体内单独检测氧化应力和电友应力

Miu Sato¹, Nahoko Yaguchi², Takuya Iijima¹

¹Departments of Medical Biochemistry, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan; Department of Biochemistry & Molecular Biology, Tohoku Medical Megabank Organization, Tohoku University, 2-1 Seiryo-machi, Aoba-ku, Sendai, 980-8573, Japan.

|September 22, 2024

概括

KEAP1-NRF2系统可以感知细胞应激. 这项研究揭示了独特的KEAP1传感器,用于体内氧化和电友应激,这对哺乳动物应激反应至关重要.

科学领域:

分子生物学分子生物学
细胞应激反应的应激反应
生物化学生化学

背景情况:

KEAP1-NRF2通路是细胞防御氧化和电友应激的核心.
KEAP1作为传感器起作用,但其体内运行,应激特异性和灵敏性机制尚不清楚.

研究的目的:

调查KEAP1传感器系统对氧化和电友应力的体内功能.
为了确定氧化和电友应力是否被类似或不同的KEAP1机制感知.
阐明KEAP1在检测生物体内这些压力的敏感性.

主要方法:

使用KEAP1-氨酸替代突变小鼠和条件氨酸-tRNA (Trsp) 淘汰小鼠.
在应对压力和遗传修饰时分析了NRF2激活.
在人类队伍中对KEAP1二分体灵敏度和全基因组测序 (WGS) 进行了理论计算.

主要成果:

通过Trsp淘汰的蛋白缺乏导致NRF2激活,但KEAP1氧化传感器突变物阻止了这种激活.
证据表明,KEAP1在体内采用不同传感器利用氧化压力和电友应力.
理论模型表明KEAP1二分子是高度敏感的,单分子修改会影响活性.
人类WGS在KEAP1氧化传感器中发现了罕见的变异,但不是电友传感器,这表明了无故障的氧化传感.

结论:

KEAP1利用明显的氨酸残留物在体内感知氧化和电友应力.
KEAP1的传感器机械非常灵敏,确保了哺乳动物高效的应激反应.
这些发现为KEAP1.1的氧化应激传感器的安全性提供了洞察力.

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