食品科学 ›› 2010, Vol. 31 ›› Issue (21): 165-168.doi: 10.7506/spkx1002-6630-201021037

• 基础研究 • 上一篇    下一篇

苏丹红Ⅲ对肌红蛋白的荧光猝灭及分子模拟研究

朱少萍1,蔡炳锋2,毛 慧2,赵 波2,*   

  1. 1.常州工学院理学院
    2.江苏省生物功能材料重点实验室,南京师范大学化学与材料科学学院
  • 收稿日期:2010-08-03 出版日期:2010-11-15 发布日期:2010-12-29
  • 通讯作者: 赵波 E-mail:zhaobo@njnu.edu.cn
  • 基金资助:

    江苏省科技厅自然科学基金项目(K2009407);上海市科委2010 年度“科技创新行动计划”生物医药和农业科技
    领域重点科技攻关项目(10391901800)

Effect of Sudan Red III on Fluorescence Quenching of Myoglobin and Molecular Modeling of Their Interaction

ZHU Shao-ping1,CAI Bing-feng2,MAO Hui2,ZHAO Bo2,*   

  1. 1. School of Science, Changzhou Institute of Technology, Changzhou 213002, China;2. Jiangsu Key Laboratory of Biofunctional
    Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, China
  • Received:2010-08-03 Online:2010-11-15 Published:2010-12-29
  • Contact: ZHAO Bo2 E-mail:zhaobo@njnu.edu.cn

摘要:

利用荧光光谱结合分子柔性对接模拟技术研究在模拟生理条件下苏丹红Ⅲ(Sudan Red Ⅲ)与肌红蛋白(myoglobin,Mb)的作用机理。结果表明:苏丹红Ⅲ对Mb 的荧光猝灭作用是由于二者之间形成复合物而导致的静态猝灭,苏丹红Ⅲ与肌红蛋白的表观结合常数KA 为7.13 × 103L/mol,结合位点数约为1;苏丹红Ⅲ与Mb 分子的第一个活性口袋周围的氨基酸残基通过疏水作用、亲水作用和氢键作用结合。苏丹红Ⅲ与Mb 分子中的Trp、Tyr、Phe 等氨基酸残基之间的疏水相互作用,主要是与Phe33、Phe43 和 Phe138 等之间的作用,导致了Mb 的内源荧光的静态猝灭和最大发射峰的无序位移。

关键词: 苏丹红Ⅲ, 肌红蛋白, 相互作用, 荧光猝灭, 分子模拟

Abstract:

The molecular interaction mechanism between Sudan red III and myoglobin (Mb) was investigated by fluorescence spectrum combined with molecular modeling under the mimic physiological conditions. Results showed that the fluorescence of Mb was quenched by Sudan red III due to the complex formation between them. This kind of fluorescence quenching was a static quenching. Molecular modeling revealed that Sudan red III could bind to the Site 1 of Mb. Hydrophobic interaction and hydrogen bond formation contribute to the binding of Sudan red III. The hydrophobic interaction and hydrophilic interaction between Sudan red III and Trp, Tyr, Phe residues in Mb resulted in static fluorescence quenching of Mb and disordered displacement of maximum emission peak. These interactions were focused on the residues of Phe33, Phe43 and Phe138 in Mb.

Key words: Sudan red III, myoglobin, interaction, fluorescence quenching, molecular modeling

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