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• W2000688814 endingPage "93" @default.
• W2000688814 startingPage "88" @default.
• W2000688814 abstract "T4 polynucleotide kinase (PNK) plays a critical role in various cellular events. Here, we describe a novel colorimetric strategy for estimating the activity of PNK and screening its inhibitors taking advantage of the efficient cleavage of λ exonuclease and the horseradish peroxidase-mimicking DNAzyme (HRPzyme) signal amplification. A label-free hairpin DNA with the sequence of HRPzyme was utilized in the assay. The 5'-hydroxyl terminal of the hairpin DNA was firstly phosphorylated in the presence of PNK and then digested by λ exonuclease. As a result, the blocked 'HRPzyme' sequence of the hairpin DNA was released due to the removal of its completely complementary sequence. Using this strategy, the assay for PNK activity was successfully translated into the detection of HRPzyme. Because of the completely blocking and efficiently releasing of HRPzyme, the colorimetric method exhibited an excellent performance in PNK analysis with a low detection limit of 0.06 U mL(-1) and a wide detection range from 0.06 to 100 U mL(-1). Additionally, the effects of different inhibitors on PNK activity were also evaluated. The proposed strategy holds great potential in the development of high-throughput phosphorylation investigation as well as in the screening of the related drugs." @default.
• W2000688814 created "2016-06-24" @default.
• W2000688814 creator A5012891430 @default.
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• W2000688814 creator A5035926649 @default.
• W2000688814 creator A5081954851 @default.
• W2000688814 date "2013-03-01" @default.
• W2000688814 modified "2023-10-18" @default.
• W2000688814 title "Colorimetric assay for T4 polynucleotide kinase activity based on the horseradish peroxidase-mimicking DNAzyme combined with λ exonuclease cleavage" @default.
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• W2000688814 doi "https://doi.org/10.1016/j.aca.2012.12.034" @default.
• W2000688814 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23427805" @default.
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