在 Tyr-82 探索共价键形成以抑制 Ral GTPase 激活
Alexander D Landgraf1, I-Ju Yeh1, Mona K Ghozayel1
1Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
ChemMedChem
|June 3, 2023
概括
研究人员开发了针对Ral GTPases的新型共价抑制剂,此前被认为是不可抗药的. 这些化合物阻断癌细胞的入侵,为新的胰腺癌治疗提供了潜力.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 药用化学 医学化学
背景情况:
- 拉尔RAS GTPases由KRAS激活,并与癌症进展有关.
- 拉尔GTPases被认为是"不可抗药"的,因为缺乏可用于共价抑制的可访问的囊残留物.
- 之前的研究发现了一种酸硫烯基化物片段,该片段将Ral与Tyr-82共同结合,形成一种可用药的口袋.
研究的目的:
- 为了探索和优化向Ral GTPase Tyr-82口袋的共价抑制剂.
- 设计和合成具有增强亲和力和稳定性的新型Ral GTPase抑制剂.
- 评估这些抑制剂在胰腺癌的体外和细胞模型中的疗效.
主要方法:
- 基于酸硫尼尔化物基架的Ral GTPase抑制剂衍生物的设计和合成.
- 用四氨酸或二酸环对碎片核心进行修改.
- 通过修改碎片的芳香环来探索Ral Switch II区域的口袋.
- 评估共价 adduct 形成,缓冲和细胞中的 GTPase 抑制,以及阻断胰腺癌细胞入侵.
主要成果:
- 化合物19 (SOF-658) 和26 (SOF-648) 在Ral Tyr-82.2.中形成了特定的共价添加物.
- 这些化合物在体外和哺乳动物细胞中证明抑制了Ral GTPase交换活性.
- 观察到胰腺管道腺癌细胞入侵的抑制.
- 化合物19在缓冲和微体试验中表现出稳定性.
结论:
- 开发了针对Ral GTPases的新型共价抑制剂,克服了以前的"无药"地位.
- 这些抑制剂有效地阻断Ral GTPase活性和胰腺癌细胞入侵.
- 化合物19显示有前途的稳定性,表明进一步优化为治疗剂的潜力,以准Ral在癌症模型中.
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