已设计并合成了七种荧光对称二聚双苯并咪唑 DB(n),最多可占据双链 B 型 DNA 的一圈,旨在开发 DNA 依赖性酶抑制剂。DB(n) 化合物包含四个 2,6-取代的苯并咪唑片段,不同之处在于双苯并咪唑嵌段之间的低聚亚甲基接头(n = 1、2、6、8、9、10、12)的长度。DB(n)-双链 DNA 复合物的形成和配体在 DNA 小沟中的定位已通过多种物理化学方法得到证实。
Dimeric bisbenzimidazoles inhibit the DNA methylation catalyzed by the murine Dnmt3a catalytic domain
摘要:
When located in the DNA minor groove, dimeric bisbenzimidazoles DB(n) effectively inhibited in vitro the Dnmt3a catalytic domain (IC(50) 5--77 mu mu M). The lowest IC(50) value was observed for compound DB(11) with an 11-unit methylene linker joining the bisbenzimidazole fragments. Increased time of incubation of DNA with DB(n) as well as the presence of AT-clusters in DNA enhances the inhibitory effect.