人类ATR-ATRIP的分子结构和抑制机制
Guangxian Wang1, Po Wang1, Zexuan Zheng1
1Department of Radiation Oncology, the First Affiliated Hospital of USTC, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230000, China.
冷EM结构揭示了形突变和Rad3相关 (ATR) 激酶抑制剂VE-822和RP-3500如何与ATR-ATRIP复合体结合. 这些发现为ATR抑制剂选择性提供了洞察力,并指导了未来的癌症药物设计.
科学领域:
- 生物化学和结构生物学.
- 癌症生物学和药物发现
背景情况:
- ATAXIA telangiectasia-mutated和Rad3相关的 (ATR) 激酶是DNA损伤反应和复制压力的关键调节者.
- 向ATR是瘤学的重要策略,在临床试验中有几种ATR抑制剂.
研究的目的:
- 确定与两个ATR抑制剂,VE-822和RP-3500结合的人类ATR-ATRIP复合物的冷电子显微镜 (冷EM) 结构.
- 阐明ATR抑制剂结合,选择性和形状变化的基础分子机制.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来解析人类ATR-ATRIP复合物的结构.
- 这些结构以大约3 Å的分辨率确定,从而实现了近乎完整的原子建模.
主要成果:
- 获得了ATR-ATRIP复合体的几乎完整的原子模型,详细介绍了子单元的固态度和相互作用.
- 观察到VE-822和RP-3500的结合方式不同,不同影响活性部位的形状.
- 一个复合体结合了四个VE-822分子,两个在活性部位,两个在二元接口;RP-3500结合涉及至关重要的水分子.
结论:
- 该研究为了解ATR激酶调节和抑制剂相互作用提供了详细的结构框架.
- 这些结构性见解对于合理设计新型ATR向癌症疗法非常有价值.
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