复制蛋白A抑制和翻译后修改对ATR激酶信号传导的影响
Matthew R Jordan1, Greg G Oakley2, Lindsey D Mayo3
1Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, 64202, USA.
Scientific reports
|August 26, 2024
概括
新的化学RPA抑制剂通过防止RPA相互作用来阻止ATR信号传递,为癌症治疗提供了有针对性的方法. 这些抑制剂比现有治疗方法具有选择性优势.
科学领域:
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
- 生物化学 生物化学
背景情况:
- 通过应对DNA损伤,ATR激酶途径对于保持基因组完整性至关重要.
- 癌细胞经常表现出内在的复制压力,使ATR途径成为一个有前途的治疗标.
- 复制蛋白A (RPA) 对于感知单链DNA (ssDNA) 和激活ATR信号是必不可少的.
研究的目的:
- 开发和描述RPA (RPAi) 的新型化学抑制剂.
- 阐明RPA抑制剂在阻断ATR激酶激活中的作用机制.
- 调查RPA后翻译修改 (PTMs) 对ATR信号和RPAi灵敏性的影响.
主要方法:
- 生物化学复制ATR激酶信号通路.
- 开发针对RPA-ssDNA相互作用 (RPA-DBi) 和RPA蛋白-蛋白相互作用 (RPA-PPIi) 的RPA抑制剂.
- 对响应RPAi的目标蛋白质ATR依赖酸化的评估.
主要成果:
- RPA-DBi和RPA-PPIi有效地取消了ATR依赖的酸化,比活性位点ATR抑制剂具有更大的选择性.
- RPA PTMs,如RPA32酸化和TopBP1酸化,可以刺激ATR激酶的激活.
- RPA70乙化不会影响目标蛋白的ATR酸化,RPAi敏感性不受RPA PTMs的影响.
结论:
- 这项研究揭示了RPA抑制剂阻断ATR信号传递的机制.
- RPA PTMs可以调节ATR激酶激活,但不会改变对RPA抑制剂的敏感性.
- RPA抑制剂为开发针对ATR通路的新型抗癌疗法提供了一个有希望的策略.
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