Mixed ligand copper(<scp>ii</scp>) dicarboxylate complexes: the role of co-ligand hydrophobicity in DNA binding, double-strand DNA cleavage, protein binding and cytotoxicity
作者:Rangasamy Loganathan、Sethu Ramakrishnan、Mani Ganeshpandian、Nattamai S. P. Bhuvanesh、Mallayan Palaniandavar、Anvarbatcha Riyasdeen、Mohamad Abdulkadhar Akbarsha
DOI:10.1039/c4dt03879g
日期:——
In contrast, 2 and 5 show CD responses which reveal their involvement in strong DNA binding. The complexes 2–4 are unique in displaying prominent double-strand DNA cleavage while 1 effects only single-strand DNA cleavage, and their ability to cleave DNA in the absence of an activator varies as 5 > 4 > 3 > 2 > 1. Also, all the complexes exhibit oxidative double-strand DNA cleavage activity in the presence
几种类型为[Cu(bimda)(diimine)] 1–5的水溶性混合配体铜(II)配合物,其中bimda为N-苄基亚氨基二乙酸,diimine为2,2'-联吡啶(bpy,1)或1 ,10-菲咯啉(phen,2)或5,6-二甲基-1,10-菲咯啉(5,6-dmp,3)或3,4,7,8-四甲基-1,10-菲咯啉(3,4 ,7,8-tmp,4)和双嘧啶[3,2- d:2',3'- f ]喹喔啉(dpq,5)已成功分离并通过元素分析和其他光谱技术表征。2中铜(II)周围的配位几何被描述为基于扭曲正方形的金字塔形,而在3中被描述为正方形金字塔形。吸收光谱滴定和竞争性DNA结合研究表明,复合物的内在DNA结合亲和力取决于二亚胺共配体,dpq(5)> 3,4,7,8-tmp(4)> 5,6-dmp(3)> phen(2)> bpy(1)。phen和dpq共配体参与与DNA碱基对的π堆积相互作用,而3,4