Structure-based design of imidazole-containing peptidomimetic inhibitors of protein farnesyltransferase
作者:Junko Ohkanda、Corey L. Strickland、Michelle A. Blaskovich、Dora Carrico、Jeffrey W. Lockman、Andreas Vogt、Cynthia J. Bucher、Jiazhi Sun、Yimin Qian、David Knowles、Erin E. Pusateri、Saïd M. Sebti、Andrew D. Hamilton
DOI:10.1039/b508184j
日期:——
A series of imidazole-containing peptidomimetic PFTase inhibitors and their co-crystal structures bound to PFTase and FPP are reported. The structures reveal that the peptidomimetics adopt a similar conformation to that of the extended CVIM tetrapeptide, with the imidazole group coordinating to the catalytic zinc ion. Both mono- and bis-imidazole-containing derivatives, 13 and 16, showed remarkably high enzyme inhibition activity against PFTase in vitro with IC50 values of 0.86 and 1.7 nM, respectively. The peptidomimetics were also highly selective for PFTase over PGGTase-I both in vitro and in intact cells. In addition, peptidomimetics 13 and 16 were found to suppress tumor growth in nude mouse xenograft models with no gross toxicity at a daily dose of 25 mg kg−1.
报道了一系列含有咪唑基的肽模拟物PFTase抑制剂及其与PFTase和FPP结合的共晶结构。这些结构揭示了肽模拟物采取类似于延伸的CVIM四肽的构象,其中的咪唑基团与催化锌离子配位。含有单咪唑和双咪唑的衍生物13和16,在体外分别表现出对PFTase极高的酶抑制活性,IC50值分别为0.86和1.7 nM。这些肽模拟物对PFTase的选择性优于PGGTase-I,无论是在体外还是在完整的细胞中。此外,肽模拟物13和16在裸鼠异种移植模型中能抑制肿瘤生长,以每天25 mg kg−1的剂量给药时没有明显的毒性。