Inhibition of Human Telomerase by 7-Deaza-2′-deoxyguanosine Nucleoside Triphosphate Analogs: Potent Inhibition by 6-Thio-7-deaza-2′-deoxyguanosine 5′-Triphosphate
作者:Terace M. Fletcher、Brian E. Cathers、K.S. Ravikumar、Blain M. Mamiya、Sean M. Kerwin
DOI:10.1006/bioo.2000.1194
日期:2001.2
We have examined analogs of the previously reported 7-deaza-2'-deoxypurine nucleoside triphosphate series of human telomerase inhibitors. Two new telomerase-inhibiting nucleotides are reported: 6-methoxy-7-deaza-2'-deoxyguanosine 5'-triphosphate (OMDG-TP) and 6-thio-7-deaza-2'-deoxyguanosine 5'-triphosphate (TDG-TP). In particular, TDG-TP is a very potent inhibitor of human telomerase with an IC(50)
我们已经检查了以前报道的人类端粒酶抑制剂的7-deaza-2'-deoxypurine核苷三磷酸系列的类似物。据报道,有两个新的抑制端粒酶的核苷酸:6-甲氧基-7-脱氮基2'-脱氧鸟苷5'-三磷酸(OMDG-TP)和6-硫代7-脱氮基2'-脱氧鸟苷5'-三磷酸(TDG- TP)。特别是,TDG-TP是一种非常有效的人类端粒酶抑制剂,IC(50)为60 nM。TDG-TP可以代替dGTP作为端粒酶的底物,但只能在相对较高的浓度下使用。在TDG-TP是唯一可用的鸟苷底物的条件下,端粒酶变成非加工性的,合成的短产物似乎只含有1-3个TDG残基。同样,效力较低的端粒酶抑制剂OMDG-TP会产生短的端粒酶产物,但效率不如TDG-TP。我们在这里显示TDG-TP,以及程度较小的OMDG-TP,可以用作模板化(Klenow exo)和非模板化(末端转移酶)DNA聚合酶的底物。对于任一种聚合酶,由TDG-