乙基的翻译后修饰调节FEN1的活动,在细胞增殖和DNA修复中发挥重要作用
Yue Xiao1,2, Mingyu Yin1,2, Yiyi Wang1,2
1Institute of Biophysics, College of Life Sciences, Zhejiang University, Hangzhou 310058, China.
Protein and peptide letters
|May 31, 2023
概括
内核酶1 (FEN1) 的基修饰对于DNA修复和细胞增殖至关重要. 改变FEN1化会影响其酶活性和相互作用,从而保持基因组的稳定性.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 细胞生物学 细胞生物学
背景情况:
- 片内核酶1 (FEN1) 是DNA复制和修复中的关键酶,具有重要的5'-片内核酶和5'-3'外核酶活动.
- 蛋白质氨酸酸化,包括乙化和化,是调节蛋白质功能和生物过程的翻译后修改.
- FEN1的化和乙化水平有所不同,在Lys200的化与DNA损伤积累有关.
研究的目的:
- 为了研究在HeLa细胞中Flap内核酶1 (FEN1) 化作用的生物学作用.
- 了解像乙化和糖化这样的修饰如何影响FEN1功能和基因组稳定性.
主要方法:
- 通过将关键的FEN1氨基酸突变为谷氨酸和谷氨酸,模仿了化状态 (乙化/无化).
- 进行细胞循环分析,MTS测定,酶动力学和免疫光学,以评估FEN1功能.
- 利用位点定向的突变发生来探索特定的氨酸修饰的影响.
主要成果:
- 缺少FEN1化导致细胞循环停止.
- 在没有乙化的情况下,观察到FEN1酶在DNA基质上的效率降低.
- FEN1的化状态影响其与DNA修复和复制蛋白的相互作用.
结论:
- 乙烯基组修改了FEN1的lys125,lys252和lys254.
- 这些特定位点的化水平对FEN1酶活性,细胞增殖和DNA损伤反应至关重要.
- 在保持基因组稳定性方面,FEN1化起着至关重要的作用.
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