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Journal Article
Research Support, Non-U.S. Gov't
Assays for the determination of the activity of DNA nucleases based on the fluorometric properties of the YOYO dye.
Archives of Biochemistry and Biophysics 2015 March 16
Here we characterize the fluorescence of the YOYO dye as a tool for studying DNA-protein interactions in real time and present two continuous YOYO-based assays for sensitively monitoring the kinetics of DNA digestion by λ-exonuclease and the endonuclease EcoRV. The described assays rely on the different fluorescence intensities between single- and double-stranded DNA-YOYO complexes, allowing straightforward determination of nuclease activity and quantitative determination of reaction products. The assays were also employed to assess the effect of single-stranded DNA-binding proteins on the λ-exonuclease reaction kinetics, showing that the extreme thermostable single-stranded DNA-binding protein (ET-SSB) significantly reduced the reaction rate, while the recombination protein A (RecA) displayed no effect.
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