食品科学 ›› 2009, Vol. 30 ›› Issue (15 ): 78-81.doi: 10.7506/spkx1002-6630-200915017

• 基础研究 • 上一篇    下一篇

倍硫磷与DNA 相互作用的光谱法研究

汪佳蓉,张国文* ,杨 佳,冯利辉   

  1. 南昌大学 食品科学与技术国家重点实验室
  • 收稿日期:2009-05-23 出版日期:2009-08-01 发布日期:2010-12-29
  • 通讯作者: 张国文 E-mail:gwzhang@ncu.edu.cn
  • 基金资助:

    科技部国家重点实验室资助项目(SKLF-MB-200807);国家质检总局科技资助项目(2009IK141);江西省自然科学基金项目( 2007GZH1924)

Spectroscopic Study of Interaction between Fenthion and DNA

WANG Jia-rong,ZHANG Guo-wen*,YANG Jia,FENG Li-hui   

  1. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
  • Received:2009-05-23 Online:2009-08-01 Published:2010-12-29
  • Contact: ZHANG Guo-wen E-mail:gwzhang@ncu.edu.cn

摘要:

在生理酸度条件下(pH7.4),采用紫外- 可见光谱法、荧光光谱法并结合溴化乙锭(EB)荧光探针、黏度测定、盐效应、磷酸盐效应和KI 荧光猝灭实验,研究倍硫磷与小牛胸腺DNA 的相互作用。结果发现,DNA 对倍硫磷内源性荧光产生强烈的猝灭作用,求得室温下倍硫磷-DNA 间的结合常数和结合位点数分别为1.14 × 104L/mol和0.958。加入倍硫磷后DNA-EB 复合物的荧光无显著猝灭,表明倍硫磷不能置换出DNA-EB 复合物中的EB;倍硫磷的存在对DNA 的相对黏度无明显影响;增加离子强度,倍硫磷自身及倍硫磷-DNA 体系的荧光无明显变化;DNA 的加入增大了I―对倍硫磷荧光的猝灭程度。上述实验现象表明,倍硫磷通过沟区结合方式与DNA 发生作用。

关键词: 倍硫磷, DNA, 荧光光谱, 结合模式

Abstract:

The interaction between fenthion and calf thymus DNA in physiological buffer (pH 7.4) was investigated by UVvis spectroscopy, fluorescence spectroscopy, viscosity measurement, salt effect, phosphate effect and KI fluorescence quenching effect. The fluorescence intensity of fenthion was significantly reduced with the addition of DNA. The binding constant and number of binding sites of fenthion with DNA were calculated as being 1.14×104 L/mol and 0.958, respectively. There were no obvious fluorescence quenching effect found on the emission peak of DNA-ethidium bromide (EB) system when fenthion was added, suggesting that there is no competition for DNA binding between fenthion and EB. Neither the relative viscosity of DNA nor the fluorescence intensity of fenthion and fenthion-DNA showed significant changes with the addition of fenthion and sodium chloride. The quenching effect of I― on the fluorescence intensity of fenthion was increased in the presence of DNA. Based on the above results, it can be inferred that fenthion and DNA interact in a groove-binding mode.

Key words: fenthion, DNA, fluorescence spectroscopy, binding mode

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