Label-free and rapid detection of ATP based on structure switching of aptamers.
In this work, an aptamer-based fluorescent strategy for label-free detection of ATP was developed by using Thioflavin T (ThT) as a fluorescence indicator, which can specifically bind with G-quadruplex DNAs to generate enhanced fluorescence intensity. In the absence of ATP, the folded structure of ATP aptamer allows the intercalation of ThT to produce strong fluorescence signal. However, upon ATP binding to the aptamer where ThT intercalated, the conformational change or distortion of the aptamer is large enough to cause much less intercalation of ThT and consequently drastic suppression of the fluorescence intensity. As such, the concentration of ATP could be identified very easily by observing fluorescence changes of this sensing system. This label-free assay could be accomplished very easily and quickly with a "mix-and-detect" detection method and exhibits high sensitivity to ATP with a detection limit of 33 nM in a wide range of 0.1-1000 μM. Furthermore, this proposed method is capable of detecting ATP in human serum and cell extracts. This method offers several advantages such as simplicity, rapidity, low cost, good stability and excellent selectivity, which make it hold great potential for the detection of ATP in bioanalytical and biological studies.
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, PR China.
Danyang
D
Ji
Institute of Quality Standard and Testing Technology for Agroproducts, Henan Academy of Agricultural Science, Zhengzhou 450002, PR China.
Hongqi
H
Wang
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, PR China.
Jia
J
Ge
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, PR China.
Lin
L
Zhang
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, PR China. Electronic address: lijianjun@zzu.edu.cn.
Jianjun
J
Li
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, PR China.
Dongmei
D
Bai
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, PR China.
Juan
J
Chen
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, PR China; Institute of Chemical Biology and Nanomedicine, Hunan University, Changsha 410082, PR China. Electronic address: zhaohui.li@zzu.edu.cn.
Zhaohui
Z
Li
D000072283:A549 Cells; D000255:Adenosine Triphosphate / Q000032:analysis* / Q000737:chemistry; D052157:Aptamers, Nucleotide / Q000737:chemistry*; D052160:Benzothiazoles; D015374:Biosensing Techniques / Q000379:methods*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D006367:HeLa Cells; D006801:Humans; D057230:Limit of Detection; D044967:Serum / Q000378:metabolism*; D013844:Thiazoles / Q000737:chemistry*
D052157:Aptamers, Nucleotide; D052160:Benzothiazoles; D005456:Fluorescent Dyes; D013844:Thiazoles; C009462:thioflavin T; D000255:Adenosine Triphosphate
ATP detection; Aptamer; Fluorescence; Label-free; Thioflavin T