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RGG-motif蛋白Scd6通过调节细胞质caTalase T1 (Ctt1) 来影响氧化应激反应
Sweta Tiwari1, Chitra Togra1, Sudharshan Sj2
1Department of Biochemistry, Indian Institute of Science, Bangalore, India.
RNA biology
|January 10, 2026
概括
细胞使用翻译抑制来管理压力. 这项研究表明,在氧化应激过程中Scd6蛋白的局部化抑制了catalase mRNA,有助于细胞存活. 这种机制在人类中是保留的.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 应激反应机制 应激反应机制
背景情况:
- 细胞通过全球翻译下调和RNA颗粒重新编程基因表达,以应对压力.
- 氧化应激会诱导像催化酶这样的基因,但转录后调节尚不清楚.
- 通过与eIF4G1.1.的相互作用,scd6蛋白抑制翻译.
研究的目的:
- 通过调节细胞质催化酶T1 (CTT1) 来研究Scd6在氧化应激反应中的作用.
- 探索在过氧化 (H2O2) 压力期间影响CTT1的转录后调节事件.
主要方法:
- 使用显微镜观察过氧化应激过程中Scd6点的形成.
- 评估细胞对H2O2的敏感性与Scd6过度表达和删除.
- 测量活性氧物种 (ROS) 和Ctt1蛋白水平.
- 使用单分子光在位杂交 (smFISH) 和RNA免疫沉 (RIP).
主要成果:
- 过氧化物应激诱导Scd6点,与P体或应激颗粒分开.
- 过度表达scd6会增加H2O2的敏感性,并降低Ctt1蛋白水平.
- 删除scd6可以提高H2O2的耐受性.
- 压力诱导的Scd6定位到puncta减少了CTT1mRNA的相互作用,导致脱抑.
- 人类同类LSm14A显示了保守的行为.
结论:
- 在氧化应激过程中,scd6调节了ctt1的翻译.
- 压力诱导的Scd6重新定位抑制了CTT1mRNA,提高了耐受性.
- 这种压力诱导的转化调节局部化机制在物种之间得到了保护.
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