K-Ras (G12C) 抑制剂可以全质地控制GTP亲和力和效应因子相互作用.
Jonathan M Ostrem1, Ulf Peters, Martin L Sos
11] Department of Cellular and Molecular Pharmacology, Howard Hughes Medical Institute, University of California, San Francisco, California 94158, USA [2].
Nature
|November 22, 2013
概括
研究人员开发了针对K-Ras (G12C) 癌症突变的新型小分子. 这些抑制剂结合不可逆转,创建一个新的可向部位,并提供突变特异性治疗策略.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 药物发现 药物发现 药物发现
背景情况:
- 在癌症中,K-Ras体质突变很常见,与治疗结果不佳有关.
- 直接准K-Ras是具有挑战性的,因为它对GTP/GDP的高度亲和力以及缺乏已知的全osteric位点.
- 致癌的K-Ras突变损害了GTP水解,增加了活跃的与GTP结合的Ras.的比例.
研究的目的:
- 开发小分子,选择性地准致癌性K-Ras (G12C) 突变.
- 确定和验证K-Ras(G12C) 上的一个新型全结位.
主要方法:
- 开发针对K-Ras的不可逆转的小分子抑制剂 (G12C).
- 结晶学研究以阐明结合机制并确定新的口袋.
- 生物化学测试以评估核酸结合和效应因子相互作用.
主要成果:
- 开发出了不可逆转的抑制剂,通过突变的氨酸,通过突变的氨酸特别与K-Ras (G12C) 结合.
- 晶体学揭示了在Switch-II区域下面的一个新的结合口袋.
- 抑制剂结合破坏了Switch-I和Switch-II,将核酸偏好从GTP转移到GDP,并损害了Raf结合.
结论:
- 在K-Ras (G12C) 上发现并验证了一个新的突变特异性全位.
- 这些发现为开发针对K-Ras (G12C) 突变癌症的向治疗提供了基于结构的策略.
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