New fluorescence-based high-throughput screening assay for small molecule inhibitors of tyrosyl-DNA phosphodiesterase 2 (TDP2)
作者:Carlos J.A. Ribeiro、Jayakanth Kankanala、Ke Shi、Kayo Kurahashi、Evgeny Kiselev、Azhar Ravji、Yves Pommier、Hideki Aihara、Zhengqiang Wang
DOI:10.1016/j.ejps.2018.03.021
日期:2018.6
molecular structure basis for TDP2 inhibitor discovery. The assay was validated by screening a preselected library of 1600 compounds (Z′ ≥ 0.72) in a 384-well format, and by running in parallel gel-based assays with fluorescent DNA substrates. This library was curated via virtual high throughput screening (vHTS) of 460,000 compounds from Chembridge Library, using the crystal structure of the novel
酪氨酰-DNA磷酸二酯酶2(TDP2)修复拓扑异构酶II(TOP2)介导的DNA损伤,并导致对以TOP2为目标的癌症治疗产生抗性。抑制TDP2可使癌细胞对TOP2抑制剂敏感。然而,尚未报道具有良好的理化性质的有效的TDP2抑制剂。因此,需要寻找能够抑制TDP2的新型分子支架。我们在此报告一种新的简单,鲁棒,均匀的混合和读取荧光生化测定法,使用人源化的斑马鱼TDP2(14M_zTDP2),它为TDP2抑制剂的发现提供了生化和分子结构基础。通过筛选预选的384孔格式的1600种化合物(Z'≥0.72)的文库,并使用带有荧光DNA底物的基于凝胶的平行试验,对试验进行了验证。使用新型替代蛋白14M_zTDP2的晶体结构,通过来自Chembridge Library的460,000种化合物的虚拟高通量筛选(vHTS)来管理该库。通过该初步筛选,我们选择了最好的32种化合物(占谱库的2%)来进一步评估