高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (12): 2465.doi: 10.7503/cjcu20190450

• 分析化学 • 上一篇    下一篇

基于滚环合成的聚分子信标用于凝血酶的靶向检测

张志庆(),汪珊珊,张子辰,马杰,王秀凤(),周亭,王芳,张国栋   

  1. 中国石油大学(华东)理学院, 青岛 266580
  • 收稿日期:2019-08-12 出版日期:2019-12-04 发布日期:2019-12-04
  • 通讯作者: 张志庆,王秀凤 E-mail:zhangzq@upc.edu.cn;xfwang@upc.edu.cn
  • 基金资助:
    山东省自然科学基金(ZR2019MB063);山东省自然科学基金(ZR2017MB045);山东省自然科学基金(ZR2016BL14);国家自然科学基金(21603276);国家自然科学基金(21703286);青岛市应用基础研究项目(17-1-1-74-jch);中央高校基本业务项目(19CX02060A);中央高校基本业务项目(19CX02049A);中央高校基本业务项目(19CX02057A)

Rolling Circle Amplification-based Polyvalent Molecular Beacon Probe for Signal-amplifying and Sensitive-Detection of Thrombin

Zhiqing ZHANG(),Shanshan WANG,Zichen ZHANG,Jie MA,Xiufeng WANG(),Ting ZHOU,Fang WANG,Guodong ZHANG   

  1. College of Science, China University of Petroleum(East China), Qingdao 266580, China
  • Received:2019-08-12 Online:2019-12-04 Published:2019-12-04
  • Contact: Zhiqing ZHANG,Xiufeng WANG E-mail:zhangzq@upc.edu.cn;xfwang@upc.edu.cn
  • Supported by:
    ? Supported by the Natural Science Foundation of Shandong Province, China(ZR2019MB063);the Natural Science Foundation of Shandong Province, China(ZR2017MB045);the Natural Science Foundation of Shandong Province, China(ZR2016BL14);the National Natural Science Foundation of China(21603276);the National Natural Science Foundation of China(21703286);the Applied Basic Research Project of Qingdao, China(17-1-1-74-jch);the Fundamental Research Funds for the Central Universities, China(19CX02060A);the Fundamental Research Funds for the Central Universities, China(19CX02049A);the Fundamental Research Funds for the Central Universities, China(19CX02057A)

摘要:

采用滚环扩增(RCA)合成得到的DNA长链打开带适配体的分子信标, 由于RCA长链上带有多个与分子信标(MB)互补的重复序列, 其打开分子信标的能力比单一互补短链提高了上百倍. 所形成的聚多价分子信标组装体, 在分子信标浓度相同的情况下, 打开后的荧光强度也大幅上升; 并且由于组装体上多价适配体的存在, 聚分子信标对凝血酶的靶向能力显著增强. 实验结果表明, 聚分子信标结合凝血酶后, 其荧光信号与凝血酶浓度呈线性关系, 检测灵敏度达到0.2 nmol/L, 该体系的构建有利于实现对凝血酶的高灵敏、 特异性检测.

关键词: 滚环扩增合成, 聚分子信标, 适配体, 凝血酶

Abstract:

A long chain structure of DNA synthesized by rolling circle amplification(RCA) was used to turn on aptamer-based molecular beacons(MBs). Owing to the multiple complementary repeat units, the RCA scaffold can hybridize tens or hundreds of MBs to form polyvalent aptamer probes. The unfold ability and the fluorescence intensity of MBs were both improved by RCA compared to short single chains. Experimental results demonstrated that the system is significantly more effective than monovalent molecular beacon in targeting thrombin and signal sensitivity because of multivalent effects. Once the poly valent molecular beacon binding to the thrombin, there was a linear relationship between fluorescence signal and thrombin concentration, and the detection limit of thrombin concentration was 0.2 nmol/L. The establishment of this system is conducive to the realization of highly sensitive and specific detection of thrombin.

Key words: Rolling circle amplification, Polyvalent molecular beacon, Aptamer, Thrombin

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