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• W3131872012 abstract "Uracil DNA glycosylases are an important class of enzymes that hydrolyze the N-glycosidic bond between the uracil base and the deoxyribose sugar to initiate uracil excision repair. Uracil may arise in DNA either because of its direct incorporation (against A in the template) or because of cytosine deamination. Mycobacteria with G, C rich genomes are inherently at high risk of cytosine deamination. Uracil DNA glycosylase activity is thus important for the survival of mycobacteria. A limitation in evaluating the druggability of this enzyme, however, is the absence of a rapid assay to evaluate catalytic activity that can be scaled for medium to high-throughput screening of inhibitors. Here we report a fluorescence-based method to assay uracil DNA glycosylase activity. A hairpin DNA oligomer with a fluorophore at its 5′ end and a quencher at its 3′ ends was designed incorporating five consecutive U:A base pairs immediately after the first base pair (5′ C:G 3’) at the top of the hairpin stem. Enzyme assays performed using this fluorescent substrate were seen to be highly sensitive thus enabling investigation of the real time kinetics of uracil excision. Here we present data that demonstrate the feasibility of using this assay to screen for inhibitors of Mycobacterium tuberculosis uracil DNA glycosylase. We note that this assay is suitable for high-throughput screening of compound libraries for uracil DNA glycosylase inhibitors." @default.
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• W3131872012 date "2021-07-01" @default.
• W3131872012 modified "2023-10-14" @default.
• W3131872012 title "Use of a molecular beacon based fluorescent method for assaying uracil DNA glycosylase (Ung) activity and inhibitor screening" @default.
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• W3131872012 doi "https://doi.org/10.1016/j.bbrep.2021.100954" @default.
• W3131872012 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7900708" @default.
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