作者:Weihong Xu、Xiaoli Yang、Lian Yang、Zhao-Li Jia、Li Wei、Fang Liu、Guo-Yuan Lu
DOI:10.1039/c0nj00347f
日期:——
and the apparent DNA binding constants of 1 and 2 are 3.93 × 107 and 6.07 × 107 M−1, respectively. Compound 2, bearing the longer spacer, exhibits the higher DNA binding ability. The apparent initial first-order rate constant (kobs) of DNA cleavage promoted by 1 and 2 (0.05 mM) in physiological media are 0.077 ± 0.0028 and 0.123 ± 0.0027 h−1, respectively. The 51-fold and 82-fold rate accelerations over
1,4,7-三氮杂环壬烷 (TACN),具有DNA裂解能力,通过不同的间隔基连接到蒽醌上,以构建新化合物1,8- [2,2'-(1,4,7-三氮杂环酮)二乙氧基]蒽-9,10-二酮盐酸盐(1)和1,8- [2,2'-(1,4,7-三氮杂环酮)二己氧基]蒽-9,10-二酮盐酸盐(2)作为无金属DNA切割的新剂。荧光和CD光谱研究表明存在嵌入的DNA结合模式,表观DNA结合常数1和2分别为3.93×10 7和6.07×10 7 M -1。具有更长间隔基的化合物2表现出更高的DNA结合能力。在生理介质中,由1和2(0.05 mM)促进的DNA切割的表观初始一级速率常数(k obs)分别为0.077±0.0028和0.123±0.0027 h -1。比父级快51倍和82倍TACN(在相同条件下,k obs为0.0015±0.00003 h -1(0.05 mM))是由于化合物1和2的蒽醌部分通过堆