Optimization of Ligands Using Focused DNA-Encoded Libraries To Develop a Selective, Cell-Permeable CBX8 Chromodomain Inhibitor
作者:Sijie Wang、Kyle E. Denton、Kathryn F. Hobbs、Tyler Weaver、James M. B. McFarlane、Katelyn E. Connelly、Michael C. Gignac、Natalia Milosevich、Fraser Hof、Irina Paci、Catherine A. Musselman、Emily C. Dykhuizen、Casey J. Krusemark
DOI:10.1021/acschembio.9b00654
日期:2020.1.17
obstacle in developing selective CBX ChD inhibitors. Here we report the selection of small, focused, DNA-encoded libraries (DELs) against multiple homologous ChDs to identify modifications to a parental ligand that confer both selectivity and potency for the ChD of CBX8. This on-DNA, medicinal chemistry approach enabled the development of SW2_110A, a selective, cell-permeable inhibitor of the CBX8 ChD. SW2_110A
聚梳抑制复合物1(PRC1)对于在发育过程中介导基因表达至关重要。五个色盒(CBX)同源蛋白CBX2,CBX4,CBX6,CBX7和CBX8被整合到PRC1复合物中,它们通过N端染色体结构域(ChD)介导对组蛋白H3(H3K27me3)的三甲基赖氨酸27的靶向作用。个别的CBX旁系同源物已被认为是癌症的药物靶标。然而,CBX ChD之间序列和结构的高度相似性为开发选择性CBX ChD抑制剂提供了主要障碍。在这里,我们报告针对多个同源ChD的小型,集中,DNA编码文库(DEL)的选择,以鉴定对亲本配体的修饰,从而赋予CBX8 ChD选择性和效力。这种基于DNA的药物化学方法使SW2_110A(一种选择性的,CBX8 ChD的细胞可渗透抑制剂。SW2_110A以800 nM的Kd结合CBX8 ChD,在体外对CBX8 ChD的选择性是其他所有CBX同源物的5倍。SW2_110A特异性抑制细胞中