Abstract
This work proposed a homogenous fluorescence assay for proteins, based on the target-triggered proximity DNA hybridization in combination with strand displacement amplification (SDA). It benefited from target-triggered proximity DNA hybridization to specifically recognize the target and SDA making recycling signal amplification. The system included a molecular beacon (MB), an extended probe (EP), and an assistant probe (AP), which were not self-assembly in the absence of target proteins, due to the short length of the designed complementary sequence among MB, EP, and AP. Upon addition of the target proteins, EP and AP are bound to the target proteins, which induced the occurrence of proximity hybridization between MB, EP, and AP and followed by strand displacement amplification. Through the primer extension, a tripartite complex of probes and target was displaced and recycled to hybridize with another MB, and the more opened MB enabled the detection signal to amplify. Under optimum conditions, it was used for the detection of streptavidin and thrombin. Fluorescence intensity was proportional to the concentration of streptavidin and thrombin in the range of 0.2–30 and 0.2–35 nmol/L, respectively. Furthermore, this fluorescent method has a good selectivity, in which the fluorescence intensity of thrombin was ~37-fold or even larger than that of the other proteins at the same concentration. It is a new and simple method for SDA-involved target protein detection and possesses a great potential for other protein detection in the future.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 21375153) and the Natural Science Foundation of Guangdong Province (Grant No. 2016A030310188).
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The study was approved by the Ethics Committee of Sun Yat-sen University, and informed consent was obtained from all individuals providing blood serum samples.
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Zhang, M., Li, R. & Ling, L. Homogenous assay for protein detection based on proximity DNA hybridization and isothermal circular strand displacement amplification reaction. Anal Bioanal Chem 409, 4079–4085 (2017). https://doi.org/10.1007/s00216-017-0356-0
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DOI: https://doi.org/10.1007/s00216-017-0356-0