Electrospray ionisation mass spectrometry, absorption spectrophotometry and circular dichroism spectroscopy were used to investigate the binding of a series of nickel complexes with the general formula [Ni(phen)2L]2+ (L = phen, dpq, dpqC and dppz) to a double stranded DNA hexadecamer. In addition, the binding of the complexes to pUC9 negatively supercoiled plasmid DNA was examined using gel electrophoresis, and their ability to inhibit DNA transcription was measured. Each of the above techniques showed that DNA binding strengthened as the size of the unique ligand L was increased. Comparison of the above results with those obtained previously, and presented here for the first time for the analogous series of ruthenium complexes [Ru(phen)2L]2+, showed that changing the metal ion from nickel to ruthenium consistently resulted in significant increases in DNA binding affinity.
采用电喷雾电离质谱、吸收分光光度法和圆二色光谱研究了一系列具有通式[Ni(phen)2L]2+(L = phen、dpq、dpqC 和 dppz)的
镍配合物与双链状 DNA 十六聚体。此外,使用凝胶电泳检查了复合物与pUC9负超螺旋质粒DNA的结合,并测量了它们抑制DNA转录的能力。上述每种技术均表明,随着独特
配体 L 大小的增加,DNA 结合增强。将上述结果与之前获得的结果进行比较,并在此首次针对类似的
钌配合物系列 [Ru(phen)2L]2+ 提出,表明将
金属离子从
镍改为
钌始终导致显着增加DNA 结合亲和力。