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• W2770645254 abstract "DNA methylation catalyzed by DNA methyltransferase plays an important role in many biological processes. However, conventional assays proposed for DNA methyltransferase activity are laborious and discontinuous. We have proposed a novel method for real-time monitoring of the activity and kinetics of Escherichia coli DNA adenine methyltransferase (Dam) using nanopore technique coupled with enzyme-linkage reactions. A double-stranded DNA probe AB having a recognition sequence 5′-GATC-3′ for both Dam and MboI restriction endonuclease was prepared. Dam catalyzed the methylation of substrate probe AB, which blocked the cleavage reaction of MboI, while the absence of Dam resulted in cleavage of nonmethylated probe AB into four ssDNA fragments by MboI. When tested with nanopore, double-stranded methylated probe AB generated long-lived events, distinguished clearly from MboI-cleavage-mediated ssDNA fragments that generated only spikelike events. The proposed method has a detection limit of 0.03 U/mL for Dam in a short assay time of about 150 min. This sensing system is easy to perform, simple to design and circumvents the use of radioactive substances, resulting in efficient detection of the activity of Dam even in complex matrixes like human serum sample. Furthermore, it has the potential to screen Dam-targeted inhibitor drugs which may assist in the discovery of new anticancer medicines. This method is general and could be extended easily for monitoring activity of a wide variety of methyltransferases by coupling with their corresponding methylation-sensitive endonucleases." @default.
• W2770645254 created "2017-12-04" @default.
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• W2770645254 date "2017-12-04" @default.
• W2770645254 modified "2023-10-15" @default.
• W2770645254 title "Nanopore-Based, Label-Free, and Real-Time Monitoring Assay for DNA Methyltransferase Activity and Inhibition" @default.
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• W2770645254 doi "https://doi.org/10.1021/acs.analchem.7b03278" @default.
• W2770645254 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29156123" @default.
• W2770645254 hasPublicationYear "2017" @default.
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