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129th General Meeting of Korean Chemical Society & Exposition Unnatural Nucleotide–Based rkDNA Probe Combined with Graphene Oxide for Detection of Alkaline Phosphatase Activity

Submission Date :
2 / 28 / 2022 , 15 : 38 : 20
Abstract Number :
129022827628
Presenting Type:
Poster Presentation
Presenting Area :
Analytical Chemistry
Authors :
Kazi Morshed Alom, Young Jun Seo*
Department of Chemistry, Jeonbuk National University, Korea
Assigned Code :
ANAL.P-336 Assigend Code Guideline
Presenting Time :
April 14 (THU) 11:00~13:00

We have developed a fluorescent double-stranded DNA, incorporating an unnatural dUrk nucleotide, that we used as a probe for the detection of alkaline phosphatase (ALP) based on enzymatic cleavage of the non-fluorescent complementary strand. Primer extension performed using the unnatural nucleotide triphosphate dUrkTP and the natural deoxynucleotide triphosphates dATP, dCTP, and dGTP provided a simple fluorescent DNA strand that hybridized with the 5´-monophosphate non-fluorescent complementary strand. When applying the 5´-phosphate recognition and cleavage properties of lambda exonuclease (λ-exo), this probe could bind to graphene oxide (GO) and quench the fluorescence (in the absence of ALP) or not bind to GO and retain its fluorescence (in the presence of ALP). We obtained strongly fluorescent DNA strands through simple incorporation of multiple A sites in the complementary sequence, thereby increasing the number of dUrk residues during primer extension. This unnatural nucleotide–based rkDNA probing system exhibited high fluorescence differentiation for discriminating the status of ALP. This rkDNA-GO probing system appears to be a promising tool for monitoring the activity of disease-associated enzymes.