高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (8): 1468.

• 论文 • 上一篇    下一篇

更生霉素-DNA反应的电化学研究

王素芬, 彭图治, 李建平   

  1. 浙江大学化学系, 西溪校区, 杭州 310028
  • 收稿日期:2002-04-27 出版日期:2003-08-24 发布日期:2003-08-24
  • 通讯作者: 彭图治(1946年出生),男,教授,博士生导师,从事电化学方面的研究.E-mail:tzp@emb.zju.edu.cn E-mail:tzp@emb.zju.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29975024);浙江省自然科学基金资助课题

Electrochemical Studies of Reaction Between Dactinomycin and DNA

WANG Su-Fen, PENG Tu-Zhi, LI Jian-Ping   

  1. Department of Chemistry, Xixi Campus, Zhejiang University, Hangzhou 310028, China
  • Received:2002-04-27 Online:2003-08-24 Published:2003-08-24

摘要: 研究了更生霉素(Act-D)在活化浸蜡石墨电极上的电化学特性,发现在-0.19和-0.51V分别出现一个灵敏的氧化峰和还原峰,加入DNA使Act-D的峰电流明显降低,生成了非电活性络合物.采用电化学方法研究了Act-D与小牛胸腺DNA的结合平衡,根据不可逆电活性分子与DNA相互作用的电化学公式对实验数据进行非线性拟合,获得了Act-D的扩散系数、Act-D与DNA的结合常数和结合位点数等重要信息,发现Act-D与DNA的8个碱基对紧密结合,其侧链加强了结合程度.

关键词: 更生霉素, DNA, 电化学方法

Abstract: The electrochemical behavior of Dactinomycin(Act-D) and the interaction between Act-Dand DNAwere investigated by using electrochemical method.In 0.1 mol/L NaH2PO4-Na2HPO4buffer(pH=7.0), Act-Dshowed a pair of oxidative and reductive peaks at -0.19 and -0.51 Vin the cyclic voltammetry.Act-Dreacted with DNAand formed an non-electroactive complex, resulting in a decrease of reductive current.The diffusion coefficient of Act-D(D), binding constant(K) and binding site size(s) of Act-Dand DNAwere obtained simultaneously by nonlinear fitting analysis of electrochemical data based on an electrochemical equation for examining the interaction between irreversible redox compounds and DNA.The results were: Df=2.0×10-5cm2·s-1, K=5.87×109cm3·mol-1, s=8.3. The overall results demonstrate that Act-Dbinds tightly to eight base pairs of ct DNA.The two cyclic penta-depsipeptides of Act-Dreinforce the interaction with DNA.

Key words: Dactinomycin, DNA, Electrochemistry method

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