Ternary Dinuclear Copper(II) Complexes of a Hydroxybenzamide Ligand with Diimine Coligands: the 5,6-dmp Ligand Enhances DNA Binding and Cleavage and Induces Apoptosis
作者:Sethu Ramakrishnan、Dhanasekaran Shakthipriya、Eringathodi Suresh、Vaiyapuri Subbarayan Periasamy、Mohammad Abdulkader Akbarsha、Mallayan Palaniandavar
DOI:10.1021/ic1024185
日期:2011.7.18
oxidative DNA cleavage involves hydroxyl radicals. In the presence of distamycin, all of the complexes, except 3, show decreased DNA cleavage activity, suggesting that the complexes prefer to bind in the DNA minor groove. All of the complexes exhibit prominent DNA cleavage even at very low concentrations (nM) in the presence of H2O2 as an activator, with the order of cleavage efficiency being 3 > 2
双核铜(II)配合物[铜2(LH)2(二亚胺)2(CLO 4)2 ](CLO 4)2(1 - 4),其中LH = 2-羟基Ñ - [2-(甲基氨基)乙基]苯甲酰胺和二亚胺= 2,2'-联吡啶(bpy; 1),1,10-菲咯啉(phen; 2),5,6-二甲基-1,10-菲咯啉(5,6-dmp; 3),已分离和表征了二吡啶并[3,2- d:2',3'- f ]喹喔啉(dpq; 4)。配合物1的X射线晶体结构含有两个由酰胺配体的酚盐部分桥接的铜(II)中心。所有的复合物显示的配体磁场带(630-655 nm),而的PhO - -to-Cu系II在溶液中的配体与金属的电荷转移带(405-420纳米)。吸收和发射光谱研究以及粘度测量结果表明,配合物4与小牛胸腺DNA的相互作用要比所有其他配合物更强,这是由于扩展的平面环(dpq)与DNA基础叠层的强烈部分嵌入而引起的。有趣的是,3的DNA结合亲和力