Abstract
A nanoplatform based on metal–organic frameworks (MOFs) and lambda exonuclease (λ exo) for the fluorimetric determination of T4 polynucleotide kinase (T4 PNK) activity and inhibition is described. Fe-MIL-88 was selected as the nanomaterial because of its significant preferential binding ability to single-stranded DNA (ssDNA) over double-stranded DNA (dsDNA) and its quenching property. The synthesized Fe-MIL-88 was characterized by transmission electron microscope, scanning electron microscope, and X-ray photoelectron spectroscopy. In the presence of T4 PNK, FAM-labeled dsDNA (FAM-dsDNA) is phosphorylated on its 5′-terminal. λ exo then recognizes and cleaves the phosphorylated strand yielding FAM-labeled ssDNA (FAM-ssDNA). The fluorescence of the produced FAM-ssDNA is quenched due to Fe-MIL-88’s absorbing on FAM-ssDNA. On the contrary, in the absence of T4 PNK, the phosphorylation and cleavage processes cannot take place. Therefore, the fluorescence of FAM-dsDNA still remains. The fluorescence intensity is detected at the maximum emission wavelength of 524 nm using the maximum excitation wavelength of 488 nm. The assay of T4 PNK based on the fluorescence quenching of FAM-ssDNA achieves a linear relationship in the range 0.01–5.0 U mL−1 with a detection limit of 0.0089 U mL−1 in buffer. The assay exhibits excellent performance for T4 PNK activity determination in a complex biological matrix. The results also reveal the ability of the assay for T4 PNK inhibitor screening.
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Funding
This work was financially supported by the National Natural Science Foundation of China (No. 61775099, 81973283, 21705080) and Natural Science Foundation of Jiangsu Province (No. BK20171487, BK20171043), Science and Technology Development Fund of Nanjing Medical University-Major Project (No. NMUD2018004) and R&D fund for Smart Health Technology Innovation of Nanjing Medical University and Jiangsu Salt Group (No. NMU-SY201801).
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Chai, Y., Cheng, X., Xu, G. et al. A nanoplatform based on metal–organic frameworks and coupled exonuclease reaction for the fluorimetric determination of T4 polynucleotide kinase activity and inhibition. Microchim Acta 187, 243 (2020). https://doi.org/10.1007/s00604-020-4194-y
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DOI: https://doi.org/10.1007/s00604-020-4194-y