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Monatshefte für Chemie - Chemical Monthly

, Volume 150, Issue 3, pp 469–475 | Cite as

Interaction of selenite with metallothionein studied by Brdička reaction

  • Jan Slavík
  • Libuše TrnkováEmail author
  • Jaromír Hubálek
Original Paper
  • 25 Downloads

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.

Graphical abstract

Keywords

Metallothionein Selenite Brdička reaction Catalytic signals Hanging mercury drop electrode Differential pulse voltammetry 

Notes

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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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  • Jan Slavík
    • 1
  • Libuše Trnková
    • 2
    Email author
  • Jaromír Hubálek
    • 1
    • 3
  1. 1.Central European Institute of TechnologyBrno University of TechnologyBrnoCzech Republic
  2. 2.Department of Chemistry, Faculty of ScienceMasaryk UniversityBrnoCzech Republic
  3. 3.Faculty of Electrical Engineering and CommunicationBrno University of TechnologyBrnoCzech Republic

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