对OGT的ULK1依赖酸化指导了O-GlcNAcylation的瘤性
Zhuan Lv1, Qingen Da2, Yumiao Li3,4
1Beijing Key Laboratory of DNA Damage Response and College of Life Sciences, Capital Normal University, Beijing, 100048, China.
Science China. Life sciences
|June 26, 2025
概括
葡萄糖水平通过控制O-GlcNAc转移酶 (OGT) 的稳定性来调节与O结合的N-乙糖胺 (O-GlcNAc). 在低葡萄糖下,ULK1介导的OGT在Ser576的酸化稳定了OGT,促进了O-GlcNAc水平和瘤发生.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 癌症研究 癌症研究
背景情况:
- 高水平的与O相关的N-乙糖胺 (O-GlcNAc) 与各种癌症有关.
- O-GlcNAc转移酶 (OGT) 通过营养物质的可用性,特别是葡萄糖的调节,尚不清楚.
- 了解OGT对营养素的反应对于癌症研究至关重要.
研究的目的:
- 确定由葡萄糖水平调节OGT活动的机制.
- 为了研究 unc-51 像自活化激酶 1 (ULK1) 在 OGT 调节中的作用.
- 探索针对癌症中OGT的治疗潜力.
主要方法:
- 质谱测量用于识别OGT酸化位点.
- 生物化学试验用于研究蛋白质与蛋白质相互作用 (OGT,ULK1,BAP1).
- 在老鼠异种移植模型中生成和分析OGT Ser576氨基突变 (OGTS576A) 敲进细胞.
主要成果:
- 葡萄糖耗尽诱导ULK1在Ser576处OGT的酸化,稳定OGT并增加O-GlcNAcylation.
- 在Ser576的酸化通过促进OGT-BAP1相互作用来抑制OGT的无处不在.
- 在老鼠异种移植模型中,OGTS576A突变取消了OGT瘤性,与减少的O-GlcNAcylation相关.
结论:
- 在Ser576中通过ULK1介导的OGT酸化是缺乏葡萄糖的关键调节机制.
- 这种酸化稳定了OGT,增强了O-GlcNAcylation,并促进了瘤发生.
- 向OGT酸化为葡萄糖相关癌症的潜在治疗策略.
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