化学研究
化學研究
화학연구
CHEMICAL RESEARCHES
2015年
4期
404-416
,共13页
八羟基喹啉铜(II)配合物%DNA结合%DNA切割%BSA
八羥基喹啉銅(II)配閤物%DNA結閤%DNA切割%BSA
팔간기규람동(II)배합물%DNA결합%DNA절할%BSA
bis-8-hydroxyquinoline copper(II) complex%DNA binding%DNA cleavage%bovine serum albumin
利用紫外吸收光谱、荧光光谱、圆二色光谱(CD )和琼脂糖凝胶电泳等手段研究了八羟基喹啉铜(II )配合物Cu[8‐OHQ]2与DNA和蛋白质的相互作用.实验结果表明,在生理条件下,Cu[8‐OHQ]2能通过插入方式较强的与CT‐DNA结合,诱导DNA构象的改变.其本征结合常数 Kb为11.5(±00.1)×105 L/mol ,表观结合常数 Kapp为42.1×106 L/mol .再者,琼脂糖凝胶电泳实验表明,在生理条件和抗坏血酸(Vc)存在情况下, Cu[8‐OHQ]2能有效地将超螺旋pBR322质粒DNA切割成缺刻和线性,甚至降解为小的片断.机理研究表明扩散的?OH ,H2 O2和1 O2都不是在切割过程中起作用的活性氧物种(ROS);copper‐oxo中间体可能是此切割过程中主要的活性氧物种.另外,Cu[8‐OHQ]2也能以适中的结合力与牛血清白蛋白(BSA)结合而猝灭BSA内源荧光,猝灭机理为静态猝灭.所有这些结果表明Cu[8‐OHQ]2具有作为潜在化疗试剂的生物活性.
利用紫外吸收光譜、熒光光譜、圓二色光譜(CD )和瓊脂糖凝膠電泳等手段研究瞭八羥基喹啉銅(II )配閤物Cu[8‐OHQ]2與DNA和蛋白質的相互作用.實驗結果錶明,在生理條件下,Cu[8‐OHQ]2能通過插入方式較彊的與CT‐DNA結閤,誘導DNA構象的改變.其本徵結閤常數 Kb為11.5(±00.1)×105 L/mol ,錶觀結閤常數 Kapp為42.1×106 L/mol .再者,瓊脂糖凝膠電泳實驗錶明,在生理條件和抗壞血痠(Vc)存在情況下, Cu[8‐OHQ]2能有效地將超螺鏇pBR322質粒DNA切割成缺刻和線性,甚至降解為小的片斷.機理研究錶明擴散的?OH ,H2 O2和1 O2都不是在切割過程中起作用的活性氧物種(ROS);copper‐oxo中間體可能是此切割過程中主要的活性氧物種.另外,Cu[8‐OHQ]2也能以適中的結閤力與牛血清白蛋白(BSA)結閤而猝滅BSA內源熒光,猝滅機理為靜態猝滅.所有這些結果錶明Cu[8‐OHQ]2具有作為潛在化療試劑的生物活性.
이용자외흡수광보、형광광보、원이색광보(CD )화경지당응효전영등수단연구료팔간기규람동(II )배합물Cu[8‐OHQ]2여DNA화단백질적상호작용.실험결과표명,재생리조건하,Cu[8‐OHQ]2능통과삽입방식교강적여CT‐DNA결합,유도DNA구상적개변.기본정결합상수 Kb위11.5(±00.1)×105 L/mol ,표관결합상수 Kapp위42.1×106 L/mol .재자,경지당응효전영실험표명,재생리조건화항배혈산(Vc)존재정황하, Cu[8‐OHQ]2능유효지장초라선pBR322질립DNA절할성결각화선성,심지강해위소적편단.궤리연구표명확산적?OH ,H2 O2화1 O2도불시재절할과정중기작용적활성양물충(ROS);copper‐oxo중간체가능시차절할과정중주요적활성양물충.령외,Cu[8‐OHQ]2야능이괄중적결합력여우혈청백단백(BSA)결합이졸멸BSA내원형광,졸멸궤리위정태졸멸.소유저사결과표명Cu[8‐OHQ]2구유작위잠재화료시제적생물활성.
The interactions between DNA/protein and the bis‐8‐hydroxyquinoline copper (II) complex , Cu[8‐OHQ]2 ,were investigated under physiological conditions using UV‐vis absorption ,fluorescence , circular dichroism (CD) ,and agarose gel electrophoresis .The experimental results suggest Cu[8‐OHQ]2 could strongly bind to calf thymus DNA (CT‐DNA) through an intercalative mode and induce a remarka‐ble conformational variation of DNA .The intrinsic binding constant Kb of Cu[8‐OHQ]2 to DNA is 1 1.5 ( ± 0 0.1) × 105 L/mol and the apparent binding constant Kapp is 4 2.1 × 106 L/mol .Furthermore ,agar‐ose gel electrophoresis revealed ,in the presence of ascorbic acid (Vc) under nearly physiological condi‐tions ,Cu[8‐OHQ]2 could efficiently cleave the supercoiled pBR322 plasmid DNA into its nicked and line‐ar forms ,even degrade into undetectable minor fragments .Mechanism studies demonstrated diffusible?OH ,H2 O2 and 1 O2 are not the effective reactive oxygen species (ROS) in the cleavage process media‐ted by the complex and the copper‐oxo species might be responsible for the cleavage .Additionally ,Cu[8‐OHQ]2 could also bind to bovine serum albumin (BSA) with a medium affinity and quench the intrinsic fluorescence of BSA through a single static quenching mechanism .All these results suggest that Cu[8‐OHQ]2 exhibits biological action as a potential chemotherapy agent .