对KRAS开关II口袋抑制剂的生物物理和结构分析揭示了基因基因特异性的结合约束
Patrick Alexander1, Albert H Chan1, Dana Rabara1
1NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research, Inc., Frederick, Maryland, USA.
The Journal of biological chemistry
|June 5, 2025
概括
针对KRAS突变的小分子抑制剂表现出不同的亲和力. 研究人员将共价和可逆抑制剂与KRAS突变剂进行了比较,揭示了对下一代药物开发的Switch-II口袋动态的见解.
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:
- 拉斯突变,特别是克拉斯突变,在许多癌症中普遍存在,包括结直肠癌,肺癌和胰腺癌.
- 最近的进展包括针对KRAS G12C突变和其他正在开发的临床化合物.
研究的目的:
- 为了比较各种KRAS小分子抑制剂与KRAS突变等位基因组的结合亲缘关系.
- 为了研究特定的KRAS突变对抑制剂与交换机II口袋结合的影响.
主要方法:
- 对同价和可逆KRAS抑制剂与不同KRAS突变等位基因进行比较的结合亲和度测试.
- 对KRAS-GDP和KRAS-GppNHp的抑制剂结合动力学 (KD值) 的分析.
- 确定KRAS Q61R-GppNHp的晶体结构,以阐明改变结合的结构基础.
主要成果:
- 对KRAS-GDP而言,共价抑制剂表现出KD值从10-9到10-3M.
- 可逆抑制剂表现出较低的nM结合亲和力.
- 由于Switch-II口袋重新排列和限制访问,观察到KRAS-GppNHp和KRAS Q61R-GppNHp的亲和力丧失.
结论:
- 该研究提供了对KRAS交换机II口袋在应对不同突变时的结构灵活性的见解.
- 这些发现对于设计下一代代代基因特异性和泛KRAS小分子抑制剂非常有价值.
- 了解这些相互作用可以指导开发更有效的针对KRAS的癌症疗法.
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