高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (11): 2462.doi: 10.7503/cjcu20130610

• 研究论文: 无机化学 • 上一篇    下一篇

水溶性羧酸咔咯铁(Ⅲ)配合物对DNA的氧化断裂作用

张阳1, 陈欢1, 闻金燕1, 王湘利1, 王惠2, 计亮年2,3, 刘海洋1,2   

  1. 1. 华南理工大学化学系, 广州 510641;
    2. 中山大学光电材料与技术国家重点实验室, 广州 510275;
    3. 生物无机与合成化学教育部重点实验室, 广州 510275
  • 收稿日期:2013-07-02 出版日期:2013-11-10 发布日期:2013-09-29
  • 作者简介:刘海洋,男,博士,教授,主要从事大环化合物和化学生物学研究,E-mail:chhyliu@scut.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:21171057,21171177)、广东省自然科学基金(批准号:10351064101000000,9351027501000003)和中山大学光电材料与技术国家重点实验室开放基金(批准号:2012-KF-MS2)资助.

Oxidative DNA Cleavage Mediated by Water-soluble Carboxyl Iron(Ⅲ) Corrole

ZHANG Yang1, CHEN Huan1, WEN Jin-Yan1, WANG Xiang-Li1, WANG Hui2, JI Liang-Nian2,3, LIU Hai-Yang1,2   

  1. 1. Department of Chemistry, South China University of Technology, Guangzhou 510641, China;
    2. State Key Laboratory of Optoelectronics Materials and Technologies, Guangzhou 510275, China;
    3. MOE Laboratory of Bioinorganic and Synthetic Chemistry, Sun Yat-Sen University, Guangzhou 510275, China
  • Received:2013-07-02 Online:2013-11-10 Published:2013-09-29

摘要:

合成了5,10,15-三(4-羧基-苯基)咔咯铁配合物(FeTCPC), 采用紫外-可见光谱、 荧光光谱、 圆二色光谱和黏度法研究了FeTCPC与小牛胸腺DNA(ct-DNA)的相互作用, 并用琼脂糖凝胶电泳研究了氧化剂参与下FeTCPC对pBR22 DNA的氧化断裂能力. 结果表明, FeTCPC与DNA的作用方式为外部结合模式, 其结合常数Kb=1.96×105 L/mol. 在过氧化氢(H2O2)或叔丁基过氧化氢(TBHP)为氧化剂条件下, FeTCPC展现出良好的DNA氧化断裂能力, 且TBHP的氧化断裂效率比H2O2好. 用H2O2和TBHP为氧化剂时, FeTCPC可能是通过活性Fe-oxo机制对DNA氧化断裂.

关键词: 咔咯, 铁, DNA, 氧化断裂

Abstract:

A new water-soluble iron corrole, 5,10,15-tris[4-(carboxy)phenyl] corrolato-iron(Ⅲ)(FeTCPC), was synthesized and characterized. UV-Vis, fluorescence and CD spectra, as well as relative viscosity were used to study the interaction between FeTCPC and ct-DNA. Agarose gel electrophrosis was also carried out to investigate the oxidative cleavage ability of FeTCPC to pBR322 DNA in the presence of hydrogen peroxide(H2O2) or tert an outside binding mode with intrinsic binding constant Kb of 1.96×105 L·mol-1. In the presence of H2O2 or TBPH, FeTCPC exhibits good oxidative cleavage activity toward pBR322 DNA, and TBPH shows a higher oxidative efficiency. Inhibitor tests reveal that neither the hydroxyl radicals nor singlet oxygen is involved in FeTCPC mediated DNA oxidative cleavage. It is suggested that (oxo)iron(V) corrole is the possible active intermediate involved in DNA oxidative damage.

Key words: Corrole, Iron, DNA, Oxidative cleavage

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