作者:Murali K. Urlam、Roberta Pireddu、Yiyu Ge、Xiaolei Zhang、Ying Sun、Harshani R. Lawrence、Wayne C. Guida、Saïd M. Sebti、Nicholas J. Lawrence
DOI:10.1039/c3md20323a
日期:——
The O-tosylsalicylamide S3I-201 (10) was used as a starting point for design and synthesis of novel STAT-3 dimerization inhibitors with improved drug-like qualities. The phosphonic acid 12d and salicylic acids 13f, 13g with a shorter amide linker lacking the O-tosyl group had improved STAT-3 inhibitory activity. The equivalent potencies observed by the replacement of phosphonic acid moiety of 12d with 5-amino-2-hydroxybenzoic acid group as in 13f further validates 5-amino-2-hydroxybenzoic acid as a phosphotyrosine mimic. The salicylic acid 13f displayed improved whole cell activity. The focused library of salicylic acids 13 with benzamide linker indicated that hydrophobic heptyl and cyclohexyl are the best tolerated R groups and a biphenyl ether (as the Ar group) significantly contributes to STAT3 inhibitory activity. Our docking studies indicated that the acidic groups of 12d, 13f and 13g interact in the p-Tyr-705 binding site in a broadly similar manner, while the phenoxybenzoyl group and the cyclohexylbenzyl group occupying pY+1 and pY−X hydrophobic pockets respectively. The in vitro and cell based potency of 13f warrants further development of this scaffold as STAT3 inhibitors.
O-甲苯磺酰水杨酰胺 S3I-201 (10) 被用作设计和合成新型 STAT-3 二聚化抑制剂的起点,该抑制剂具有改进的药物样品质。具有缺少O-甲苯磺酰基的较短酰胺连接体的膦酸12d和水杨酸13f、13g具有改善的STAT-3抑制活性。通过用 13f 中的 5-氨基-2-羟基苯甲酸基团替换 12d 的膦酸部分观察到的等效效力进一步验证了 5-氨基-2-羟基苯甲酸作为磷酸酪氨酸模拟物。水杨酸 13f 显示出改善的全细胞活性。带有苯甲酰胺连接体的水杨酸 13 的聚焦文库表明,疏水性庚基和环己基是耐受性最好的 R 基团,而联苯醚(作为 Ar 基团)对 STAT3 抑制活性有显着贡献。我们的对接研究表明,12d、13f 和 13g 的酸性基团以大致相似的方式在 p-Tyr-705 结合位点中相互作用,而苯氧基苯甲酰基和环己基苄基分别占据 pY+1 和 pY−X 疏水袋。 13f 的体外和基于细胞的效力保证了该支架作为 STAT3 抑制剂的进一步开发。