Preparation of a DNA aptamer-Pt complex and its use in the colorimetric sensing of thrombin and anti-thrombin antibodies

Akon Higuchi, Yi Di Siao, Siou Ting Yang, Pei Vin Hsieh, Hisashi Fukushima, Yung Chang, Ruoh Chyu Ruaan, Wen Yih Chen

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

DNA aptamers carrying Pt nanoparticles were prepared by the reaction of DNA aptamers (without functionalization with biotin, thiol, or other reactive groups) with K2[PtCl4] in solution at 60-90°C. The DNA-Pt complexes possessed peroxidase enzymatic activity while retaining the specific binding ability of the aptamers. The enzymatic reaction of these complexes obeyed Michaelis-Menten kinetics. KM for the DNA-Pt complex was found to be on the same order as KM for hemin and hemin-DNA complex but 1 or 2 orders of magnitude higher than that of horseradish peroxidase. The rate of the reaction catalyzed by the DNA-Pt complex, k cat, was found to be on the same order as that of hemin and hemin-DNA complex but 2 or 3 orders of magnitude lower than that of horseradish peroxidase. Two types of DNAzyme-linked aptamer assays (DLAAs) were developed using these complexes, which successfully detected target proteins, with the sandwich type of DLAA targeting thrombin and the competitive type of DLAA targeting anti-thrombin IgA/G/M in serum. The DNA-Pt complexes retained their peroxidase enzymatic activity even after heat treatment. DLAAs having high thermal stability were developed using these complexes, which were free of animal and plant matter because neither antibodies nor horseradish peroxidase were used in their synthesis.

Original languageEnglish
Pages (from-to)6580-6586
Number of pages7
JournalAnalytical Chemistry
Volume80
Issue number17
DOIs
StatePublished - 1 Sep 2008

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