Electrocatalysis of ferricyanide reduction mediated by electron transfer through the DNA duplex: kinetic analysis by thin layer voltammetry

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DNA-mediated electron transfer (ET) underlies a variety of bioelectronics applications, and, thus, simple approaches for its kinetic analysis are required. Here, electrocatalysis of a ferricyanide reduction catalyzed by methylene blue (MB) bound to either (dGdC)20 or (dAdT)25 duplexes tethered to gold via an alkanethiol linker was voltammetrically studied at stationary electrodes, and its kinetics was analyzed by two theoretical models. A thin layer voltammetry analysis, assuming that the reaction occurs within the l-nm thick layer formed by the DNA duplexes of the length l, yielded the electrocatalytic rate constant k1 of (2.1 ± 0.4)105 and (2.4 ± 0.5)106 M−1 s−1, for (dGdC)20 and (dAdT)25. The sequence-specific k1 values were consistent with structural differences of (dGdC)20 or (dAdT)25 at the negatively polarized interface and approached the k1 previously reported for the rotating disk electrode system (Angew. Chemie Int. Ed. 58 (2019) 3048). These results offer new tools for immediate kinetic analysis of electrocatalytic reactions involving long-range ET along the DNA duplexes, the tools that allow differentiating electrical properties of nucleic acids in the most convenient and simple way.

Original languageEnglish
JournalElectrochimica Acta
Pages (from-to)703-710
Number of pages8
Publication statusPublished - 20 Sep 2019

    Research areas

  • DNA-Mediated electron transfer, Electrocatalysis, Ferricyanide, Gold electrodes, Methylene blue

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