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Interaction of selenite with metallothionein studied by Brdička reaction

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Abstract

Metallothionein II (MT) is a cytosolic, ubiquitous, low-molecular-weight protein present in various tissues of mammals and non-mammals. MTs have a high content of thiol groups (–SH) which can bind mineral micronutrients and xenobiotic heavy metals. In this study, we investigated the electrode processes of MT at a mercury electrode in the presence of sodium selenite by means of the Brdička reaction in the differential pulse voltammetric mode. In Brdička solution containing ammonium buffer and [Co(NH3)6]Cl3, the substance that provides catalytic reactions with proteins, interactions between MT and sodium selenite were analyzed via the hydrogen evolution catalytic signals. The reaction of –SH groups of MT with [Co(H2O)6]2+ complex ions on the mercury surface results into the catalytic peak Cat2. It was found that selenite ions are active in the Brdička reaction and yield also the catalytic peak of hydrogen evolution Cat2. With the increasing concentration of sodium selenite, cobalt (Co) in MT is replaced by selenium (Se). When selenite concentration increases above the MT binding capacity, i.e., MT cannot bind more Se, only selenite ions can be responsible for Cat2 signals. From our results, we conclude that Brdička reaction is a suitable method to study MT binding properties and to evaluate the influence of sodium selenite. To elucidate the experimental results a new interpretation leading to complete description of the mechanism is presented.

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Acknowledgements

The work has been supported by the project CEITEC Nano Research Infrastructure (ID LM2015041, MEYS CR, 2016-2019) and SIX Research Center in the Czech Republic (financial support of the grant LO1401 INWITE is gratefully acknowledged). The authors would like to thank the Dr. Jan Hrbáč for the English text proofreading and fruitful discussion.

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Authors and Affiliations

  1. Central European Institute of Technology, Brno University of Technology, Purkynova 123, 616 00, Brno, Czech Republic

    Jan Slavík & Jaromír Hubálek

  2. Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00, Brno, Czech Republic

    Libuše Trnková

  3. Faculty of Electrical Engineering and Communication, Brno University of Technology, Technicka 3058/10, 61600, Brno, Czech Republic

    Jaromír Hubálek

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  1. Jan Slavík
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  2. Libuše Trnková
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Correspondence to Libuše Trnková.

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Slavík, J., Trnková, L. & Hubálek, J. Interaction of selenite with metallothionein studied by Brdička reaction. Monatsh Chem 150, 469–475 (2019). https://doi.org/10.1007/s00706-019-02397-4

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  • DOI: https://doi.org/10.1007/s00706-019-02397-4

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