Abstract
A photoelectrochemical (PEC) method is described for the determination of the activity of M.SssI methyltransferase (MTase). The assay relies on enzyme-linkage reactions and a DNA intercalator Ru(bpy)2(dppz)2+ (where bpy is 2,2′-bipyridine, and dppz is dipyrido[3,2-a:2′,3′-c]phenazine) which both serves as a PEC signal. The PEC electrode was obtained by immobilizing 5′-amino modified DNA strands (containing the methylation recognition site 5′-CCGG-3′) on a polyethylenimine (PEI) coated ITO/SnO2 electrode with glutaraldehyde as crosslinking agent. In the presence of MTase and S-adenosyl-L-methionine, the 5′-CCGG-3′ sequence in the DNA on the electrode is methylated. This protects the DNA strands from the shear of the methylation-sensitive restriction endonuclease HpaII. Consequently, more intact DNA strands remain on the surface of the electrode, providing more sites for Ru(bpy)2(dppz)2+ binding which in turn results in a high PEC response. The result demonstrates that the photocurrent increases linearly with the activity of MTase from 5 to 80 U·mL−1, and the limit of detection is 0.45 U·mL−1. The other MTases does not enhance the photocurrent, suggesting good selectivity of the assay. The method was also applied to rapid evaluate and screen the inhibitors of MTase. This strategy can be utilized to determinate the activity of other DNA MTases with specific DNA sequence.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (21475088, 21507087), PCSIRT (IRT1269), Chenguang Program of Shanghai Municipal Education Commission, and International Joint Laboratory on Resource Chemistry (IJLRC).
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The supporting information is available free of charge. It includes the PEC response of the method with different concentrations of PEI; the PEC response of the method with different concentrations of glutaraldehyde; the photocurrent of Ru(bpy)2(dppz)2+ intercalated into the ITO/SnO2/PEI/GA/DNA film after it was incubated with different enzyme solution; the repeatability of the assay; the data of real sample detection
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Liu, X., Wei, C., Luo, J. et al. Photoelectrochemical determination of the activity of M.SssI methyltransferase, and a method for inhibitor screening. Microchim Acta 185, 498 (2018). https://doi.org/10.1007/s00604-018-3033-x
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DOI: https://doi.org/10.1007/s00604-018-3033-x