5′‐bispivaloyloxymethyl (POM)‐AmdU and DiMOC exhibited low cytotoxicity, but highly toxic DNA‐DNA ICLs were generated by metabolic incorporation of AmdU groups into cellular DNA, followed by treatment of the cells with DiMOC. These results provide the first examples of intercalation‐enhanced bioorthogonal chemical reactions on DNA, and furthermore, the first strain‐promoted double click (SPDC) reactions inside
DNA–DNA
交联剂是重要的
化学治疗药物家族,它们与内源性亲核试剂非特异性反应,因此表现出不良的副作用。此处我们报告一个阳离子海玛二炔衍
生物“DiMOC”表现出弱,可逆地嵌入到双链DNA(ķ d = 15μ米),其中它经历串联张力促进交联含
叠氮基的DNA,得到DNA-DNA链间交联(
ICLs)具有非常高的视在频率常数k app = 2.1×10 5 m -1 s -1。与DIMOC和5-(
叠氮基甲基)-
2'-脱氧尿苷(AmdU)核苷之间的反应相比,这代表了21 000倍的速率增强。作为单药,5'-双新戊酰氧基甲基(POM)-AmdU和DiMOC表现出低细胞毒性,但通过将AmdU基团代谢合并到细胞DNA中并随后用DiMOC处理细胞而产生高毒性DNA-DNA
ICL。这些结果提供了在DNA上进行插层增强的
生物正交
化学反应的第一个实例,此外,还提供了活细胞内部第一个菌株促进的双击(S
PDC)反应。