通过O-GlcNAcylation直接刺激de novo核酸合成
Lulu Chen1,2, Qi Zhou1,2, Pingfeng Zhang1
1Cancer Center, Renmin Hospital of Wuhan University, Wuhan, China.
Nature chemical biology
|June 12, 2023
概括
与O结合的N-乙糖胺 (O-GlcNAc) 直接控制核酸合成和NAD+的产生. 这种PRPS1的O-GlcNAcylation增强了它的活性,影响了癌症和艺术综合征等疾病.
科学领域:
- 生物化学 生化学
- 细胞的新陈代谢
- 分子生物学分子生物学
背景情况:
- 与O结合的β-N-乙糖胺 (O-GlcNAc) 是一个动态的翻译后修饰,对细胞代谢至关重要.
- O-GlcNAc信号的失调与各种病理状况有关,包括癌症和代谢障碍.
- 在O-GlcNAc和关键的代谢途径之间的相互作用仍然不完全理解.
研究的目的:
- 调查O-GlcNAc在调节新核酸合成和NAD+生产中的直接作用.
- 阐明O-GlcNAc修改基酸盐合成酶1 (PRPS1) 活性的机制.
- 探索PRPS1 O-GlcNAcylation在疾病背景中的影响,例如肺癌和艺术综合征.
主要方法:
- 使用生物化学分析来评估PRPS1活性和O-GlcNAcylation.
- 使用基于细胞的实验来研究O-GlcNAc转移酶 (OGT),PRPS1和AMP激活蛋白激酶 (AMPK) 之间的相互作用.
- 在肺癌模型和来自患者的样本中分析了PRPS1 O-GlcNAcylation水平.
主要成果:
- O-GlcNAc 直接调节 de novo 核酸合成和 NAD+ 的产生.
- 由OGT对PRPS1的O-GlcNAcylation通过促进六合体形成和克服反抑制来增强其活性.
- PRPS1 O-GlcNAcylation 抑制AMPK介导的酸化,独立调节PRPS1的活动.
- 升高的PRPS1 O-GlcNAcylation促进了肺部瘤发生和化学抵抗.
- 与阿尔茨综合征相关的PRPS1 R196W突变体显示O-GlcNAcylation和活性降低.
结论:
- O-GlcNAc信号传递是de novo核酸合成和NAD+生产的关键调节器.
- 由OGT进行的PRPS1O-GlcNAcylation代表了一种控制核酸合成和细胞代谢的新机制.
- 异常的PRPS1 O-GlcNAcylation有助于人类疾病,包括癌症和艺术综合征,突出潜在的治疗点.
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