Abstract
We developed a simple and rapid method for terminal deoxynucleotidyl transferase (TdT) assay on the basis of the polymerization-directed exonuclease-assisted construction of a single quantum dot (QD)-based fluorescence resonance energy transfer (FRET) nanosensor. This method is very sensitive with a detection limit as low as 1 × 10-6 U μL-1, and it can be used for the screening of TDT inhibitors and accurate quantification of TdT activity even in 5 cancer cells.
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