Abstract
This study presents a fluorescence method for detecting adenosine triphosphate (ATP) based on a label-free Ag nanocluster molecular beacon (MB) with high sensitivity. The sensor contains a hairpin-shaped MB, two short single-stranded DNA strands, and T4 DNA ligase. The MB consists of three parts, which are the template DNA sequence for synthesizing Ag nanoclusters at the 5′ end, the middle DNA with a hairpin-shaped structure, and the guanine base-rich DNA sequence at the 3′ end. The sensor exhibits high fluorescence intensity in the absence of ATP. However, when the probe is used for ATP detection, the two short DNA sequences in the sensor would form a long sequence by enzymatic ligation reaction; this long sequence opens the hairpin-shaped structure of the MB and decreases the fluorescence of the system. Under optimal analytical conditions, a clear linear relationship is observed between ATP concentration and fluorescence intensity in the range of 0.1–10 μM. The interference presented by other small molecules during ATP detection is evaluated, and results confirm the good selectivity of the proposed sensor. Compared with traditional methods, the sensor is label free, easy to operate, inexpensive, and highly sensitive.
Highlights
Adenosine triphosphate (ATP) is the energy source of cells; it stores and transmits chemical energy in the life system
We present a fluorescence method for ATP detection based on a label-free Ag nanocluster Molecular beacon (MB) with low cost and high sensitivity. e label-free MB is synthesized without fluorescent dye labeling and DNA terminal modification
We designed a fluorescence method for ATP detection based on a label-free Ag nanocluster MB with high sensitivity. e MB is a single-stranded oligonucleotide probe containing a template DNA sequence for synthesizing Ag nanoclusters at the 5′ end, a middle DNA sequence with a hairpin-shaped structure, and a G-rich DNA sequence at the 3′ end
Summary
Adenosine triphosphate (ATP) is the energy source of cells; it stores and transmits chemical energy in the life system. We present a fluorescence method for ATP detection based on a label-free Ag nanocluster MB with low cost and high sensitivity. The sensor shows an obvious fluorescence decrease with two short DNA strands and T4 DNA ligase in the presence of ATP.
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