高流动性组盒1 (HMGB1) 的O-GlcNAcylation改变其DNA结合和DNA损伤处理活动
Aaron T Balana, Anirban Mukherjee1, Harsh Nagpal2
1Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Dell Pediatric Research Institute, 1400 Barbara Jordan Boulevard, Austin, Texas 78723, United States.
Journal of the American Chemical Society
|September 21, 2021
概括
蛋白质O-GlcNAcylation改变了HMGB1,影响了其DNA结合和修复功能. 这种糖修饰增强了HMGB1对受损DNA的寡合化,并损害了DNA修复,可能将O- GlcNAc与癌症突变联系起来.
科学领域:
- 生物化学
- 分子生物学
- 细胞生物学
背景情况:
- 蛋白O-GlcNAcylation是一种关键的翻译后修饰,调节细胞过程,包括DNA复制和修复.
- 已知核蛋白HMGB1 (高流动性组盒1) 是O-GlcNAcylated,这表明它在DNA损伤反应中起作用.
研究的目的:
- 研究O-GlcNAcylation对HMGB1的功能影响.
- 确定O-GlcNAc在特定部位的修饰如何影响HMGB1与受损DNA的相互作用及其在DNA修复中的作用.
主要方法:
- 对O-GlcNAc修饰的HMGB1的特定场所合成
- 生物化学测试以评估改性HMGB1的DNA结合活性.
- 免细胞提取实验评估HMGB1在DNA修复促进中的作用.
主要成果:
- 在S100和S107确认了HMGB1的内源性O- GlcNAcylation,其中S100是主要的部位.
- 在S100的O-GlcNAc修饰改变了HMGB1与各种形式的受损DNA的结合,通常增加了其寡合化.
- O-GlcNAc的修改降低了HMGB1促进DNA修复的能力,导致易发生错误的DNA处理.
结论:
- HMGB1的O-GlcNAcylation对其DNA结合特性和DNA修复功能产生显著影响.
- 由于O- GlcNAc导致的HMGB1功能改变可能导致某些癌症中O- GlcNAc水平升高的突变率增加.
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