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• W4385490957 endingPage "12330" @default.
• W4385490957 startingPage "12330" @default.
• W4385490957 abstract "We present a novel label-free colorimetric method for detecting exonuclease III (Exo III) activity using the peroxidase-mimicking activity of cerium oxide nanoparticles (nanoceria). Exo III, an enzyme that specifically catalyzes the stepwise removal of mononucleotides from the 3′-OH termini of double-stranded DNA, plays a significant role in various cellular and physiological processes, including DNA proofreading and repair. Malfunctions of Exo III have been associated with increased cancer risks. To assay the activity of Exo III, we applied the previous reports in that the peroxidase-mimicking activity of nanoceria is inhibited due to the aggregation induced by the electrostatic attraction between DNA and nanoceria. In the presence of Exo III, the substrate DNA (subDNA), which inhibits nanoceria’s activity, is degraded, thereby restoring the peroxidase-mimicking activity of nanoceria. Consequently, the 3,3′,5,5′-tetramethylbenzidine (TMB) substrate is oxidized, leading to a color change from colorless to blue, along with an increase in the absorbance intensity. This approach enabled us to reliably detect Exo III at a limit of detection (LOD) of 0.263 units/mL across a broad dynamic range from 3.1 to 400 units/mL, respectively, with an outstanding specificity. Since this approach does not require radiolabels, complex DNA design, or sophisticated experimental techniques, it provides a simpler and more feasible alternative to standard methods." @default.
• W4385490957 created "2023-08-03" @default.
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• W4385490957 date "2023-08-02" @default.
• W4385490957 modified "2023-09-26" @default.
• W4385490957 title "Peroxidase-Mimicking Activity of Nanoceria for Label-Free Colorimetric Assay for Exonuclease III Activity" @default.
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• W4385490957 doi "https://doi.org/10.3390/ijms241512330" @default.
• W4385490957 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37569706" @default.
• W4385490957 hasPublicationYear "2023" @default.
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