Identification of a New Heterocyclic Scaffold for Inhibitors of the Polo-Box Domain of Polo-like Kinase 1
作者:Celeste N. Alverez、Jung-Eun Park、Kiran S. Toti、Yangliu Xia、Kristopher W. Krausz、Ganesha Rai、Jeong K. Bang、Frank J. Gonzalez、Kenneth A. Jacobson、Kyung S. Lee
DOI:10.1021/acs.jmedchem.0c01669
日期:2020.11.25
As a mitotic-specific target widely deregulated in various human cancers, polo-like kinase 1 (Plk1) has been extensively explored for anticancer activity and drug discovery. Although multiple catalytic domain inhibitors were tested in preclinical and clinical studies, their efficacies are limited by dose-limiting cytotoxicity, mainly from off-target cross reactivity. The C-terminal noncatalytic polo-box
作为在各种人类癌症中广泛失调的有丝分裂特异性靶标,polo 样激酶 1 (Plk1) 已被广泛探索用于抗癌活性和药物发现。尽管在临床前和临床研究中测试了多种催化结构域抑制剂,但它们的功效受到剂量限制性细胞毒性的限制,主要来自脱靶交叉反应。 Plk1 的 C 端非催化 polo-box 结构域 (PBD) 已成为产生新的蛋白质-蛋白质相互作用抑制剂的有吸引力的靶标。在这里,我们鉴定了一种 1-thioxo-2,4-dihydro-[1,2,4]triazolo[4,3 -a ]quinazolin-5(1 H )-one 支架,可有效抑制 Plk1 PBD,但不能抑制其相关的 Plk2和 Plk3 PBD。结构-活性关系研究发现多种抑制剂的抑制活性比之前表征的 Plk1 PBD 特异性磷酸肽 PLHSpT ( K d ∼ 450 nM) 高 ≥10 倍。此外, S-甲基前药有效抑制有丝分裂进