Protein structural transition at negatively charged electrode surfaces. Effects of temperature and current density

0447601 - BFÚ 2016 RIV GB eng J - Journal Article
Černocká, Hana - Ostatná, Veronika - Paleček, Emil
Protein structural transition at negatively charged electrode surfaces. Effects of temperature and current density.
Electrochimica acta. Roč. 174, AUG 2015 (2015), s. 356-360. ISSN 0013-4686. E-ISSN 1873-3859
R&D Projects: GA ČR(CZ) GAP301/11/2055; GA ČR(CZ) GA15-15479S; GA ČR(CZ) GA13-00956S
Institutional support: RVO:68081707
Keywords : Bovine serum albumin * sensing of surface-attached protein stability * protein structural transition at Hg
Subject RIV: BO - Biophysics
Impact factor: 4.803, year: 2015

Earlier it was shown that surface-attached bovine serum albumin undergoes ionic strength-induced structural transition at mercury electrodes. Using constant current chronopotentiometric stripping (CPS) here we show that this electric field-driven transition is influenced also by other factors, such as temperature, current density, and particularly by the time of surface-attached protein exposure to the negative potentials. For example, 1 s exposure to -1.6 V (against Ag/AgC1/3 M KC1) results in the protein denaturation. Exposures longer than 1 s resulted in protein denaturation even at less negative potentials. On the other hand, in CPS much shorter exposure times can be used. Exposing the surface-attached protein to negative potentials for ms time intervals the protein stability can be tested at different current densities. We investigated several proteins such as bovine and human serum albumins, ovalbumin, ot-macroglobulin and ot-synuclein, which showed various profiles in dependence on different parameters, including time of the protein exposure to negative potentials, ionic strengths and temperature.
Permanent Link: http://hdl.handle.net/11104/0249408