antimitotic activities. 1-Phenyl-dihydrobenzoindazole was found as a novel scaffold of CSI without the cis−trans isomerization problem. The X-ray co-crystal structure of the lead compound with tubulin was determined, which revealed the binding mode including special water-bridged hydrogen bonds. The structure also provided guidance for the structural optimization of this type of CSI, which led to the discovery
秋水仙碱位点
抑制剂(CSIs)由于其除了抗有丝分裂活性外还具有血管破坏作用,因此有望用作
抗肿瘤药。发现1-苯基-二氢苯并
吲唑是CSI的新型支架,没有顺-反异构化问题。确定了
铅化合物与微管蛋白的X射线共晶体结构,揭示了包括特殊
水桥式氢键的结合模式。该结构还为此类CSI的结构优化提供了指导,从而导致发现了最有效的
抑制剂A3,其针对人结肠癌
细胞系和微管蛋白聚合的IC 50的生长IC 50低于1 nM。为1.6μM。此外,其
水溶性前药B1对两种人结肠癌异种移植裸鼠模型均显示出良好的体内抗肿瘤活性,从而鼓励对该类型的抗肿瘤化合物进行进一步的研究。