Targeting Abasic Sites in DNA by Aminoalkyl-Substituted Carboxamidoacridizinium Derivatives and Acridizinium–Adenine Conjugates
作者:Katja Benner、Anton Granzhan、Heiko Ihmels、Giampietro Viola
DOI:10.1002/ejoc.200700207
日期:2007.10
acridizinium derivatives with abasic-site containing DNA was assessed by thermal denaturation experiments with synthetic double-stranded oligonucleotides, which contained one (TX) or no abasic site (TA). The acridizinium–adenine conjugates stabilize the DNA with the abasic position slightly more than they do the regular duplex, as indicated by the difference of the induced melting-temperature shifts between the
从相应的羧基吖啶盐制备了两种异构吖啶鎓-腺嘌呤缀合物以及三种模型化合物(即两种 9-(N-烷基羧酰胺)吖啶盐和一种 9-N-[(二甲氨基)烷基]羧酰胺}吖啶盐)。这些化合物与小牛胸腺 DNA 的相互作用通过分光光度法和粘度滴定法、LD 光谱法和 DNA 热变性实验进行了研究。吖啶鎓-腺嘌呤结合物和 N-烷基甲酰胺均以中等亲和力嵌入小牛胸腺 DNA [K ≈ 104M–1(DNA 浓度以 bp 为单位)]。相比之下,N-[3-(二甲氨基)丙基]-取代的甲酰胺在相同条件下表现出明显更高的结合常数 (K ≈ 105M–1)。吖啶鎓衍生物与含有脱碱基位点的 DNA 的关联是通过热变性实验评估的,合成双链寡核苷酸含有一个 (TX) 或不含脱碱基位点 (TA)。吖啶鎓-腺嘌呤缀合物使 DNA 的脱碱基位置比常规双链体稍微稳定,如 TX 和 TA 双链体之间诱导解链温度变化的差异所示(ΔΔTm ≈ 4