Metal–Salen-Base-Pair Complexes Inside DNA: Complexation Overrides Sequence Information
作者:Guido H. Clever、Yvonne Söltl、Heather Burks、Werner Spahl、Thomas Carell
DOI:10.1002/chem.200600558
日期:2006.11.24
incorporated into various DNA duplexes. Reaction with ethylenediamine leads to formation of the well-known salen ligand inside the DNA double helix. Addition of transition-metal ions such as Cu(2+), Mn(2+), Ni(2+), Fe(2+), or VO(2+) results in the formation of metal-salen-base-pair complexes, which were studied by using UV and circular dichroism (CD) spectroscopy. HPLC and ESI mass spectrometric measurements
已经制备了两种异构的水杨醛核碱基并将其掺入各种DNA双链体中。与乙二胺的反应导致在DNA双螺旋内部形成众所周知的salen配体。添加过渡金属离子,例如Cu(2 +),Mn(2 +),Ni(2 +),Fe(2+)或VO(2+),会导致形成金属-salen-碱对配合物,通过使用紫外和圆二色性(CD)光谱进行了研究。HPLC和ESI质谱测量显示DNA-金属系统具有异常高的稳定性。这些金属salen配合物充当链间交联,从而导致DNA双链体的强烈稳定,如通过热脱色和复性实验所研究的。即使配体前体的预组织不利且DNA双链体因金属络合而扭曲,络合物的形成也足以覆盖序列信息。此外,根据从相应的铜-salen配合物8的晶体结构获得的结果,熔点研究表明,源自配体2的salen配合物更适合DNA双链体。