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Dorčák V, Kroutil O, Kabeláč M, Janata J, Vacek J. Cysteamine Chemisorption at Mercury-Solution Interfaces in the Context of Redox and Microdissociation Equilibria. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:6253-6260. [PMID: 38489512 DOI: 10.1021/acs.langmuir.3c03744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/17/2024]
Abstract
The redox behavior and chemisorption of cysteamine (CA) at a charged mercury surface are described, with an emphasis on its acid-base properties supported by molecular dynamics and quantum mechanical calculations. It was found that CA forms chemisorbed layers on the surface of the mercury electrode. The formation of Hg-CA complexes is connected to mercury disproportionation, as reflected in peaks SII and SI at potentials higher than the electrode potential of zero charge (p.z.c.). Both the process of chemisorption of CA and its consequent redox transformation are proton-dependent. Also, depending on the protonation of CA, the formation of typical populations of chemisorbed conformers can be observed. In addition, cystamine (CA disulfide dimer) can be reduced on the mercury surface. Between the potentials of this reduction and peak SI, the p.z.c. of the electrode used can be found. Furthermore, CA can serve as an LMW catalyst for hydrogen evolution. The mechanistic insights presented here can be used for follow-up research on CA chemisorption and targeted modification of other metallic surfaces.
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Affiliation(s)
- Vlastimil Dorčák
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc 775 15, Czech Republic
| | - Ondřej Kroutil
- Central European Institute of Technology, Masaryk University, Kamenice 5, Brno 625 00, Czech Republic
| | - Martin Kabeláč
- Department of Chemistry, Faculty of Science, University of South Bohemia, Branisovska 31, Ceske Budejovice 370 05, Czech Republic
| | - Jiří Janata
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Jan Vacek
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc 775 15, Czech Republic
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Vacek J, Zatloukalová M, Dorčák V, Cifra M, Futera Z, Ostatná V. Electrochemistry in sensing of molecular interactions of proteins and their behavior in an electric field. Mikrochim Acta 2023; 190:442. [PMID: 37847341 PMCID: PMC10582152 DOI: 10.1007/s00604-023-05999-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 09/12/2023] [Indexed: 10/18/2023]
Abstract
Electrochemical methods can be used not only for the sensitive analysis of proteins but also for deeper research into their structure, transport functions (transfer of electrons and protons), and sensing their interactions with soft and solid surfaces. Last but not least, electrochemical tools are useful for investigating the effect of an electric field on protein structure, the direct application of electrochemical methods for controlling protein function, or the micromanipulation of supramolecular protein structures. There are many experimental arrangements (modalities), from the classic configuration that works with an electrochemical cell to miniaturized electrochemical sensors and microchip platforms. The support of computational chemistry methods which appropriately complement the interpretation framework of experimental results is also important. This text describes recent directions in electrochemical methods for the determination of proteins and briefly summarizes available methodologies for the selective labeling of proteins using redox-active probes. Attention is also paid to the theoretical aspects of electron transport and the effect of an external electric field on the structure of selected proteins. Instead of providing a comprehensive overview, we aim to highlight areas of interest that have not been summarized recently, but, at the same time, represent current trends in the field.
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Affiliation(s)
- Jan Vacek
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, 77515, Olomouc, Czech Republic.
| | - Martina Zatloukalová
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, 77515, Olomouc, Czech Republic
| | - Vlastimil Dorčák
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, 77515, Olomouc, Czech Republic
| | - Michal Cifra
- Institute of Photonics and Electronics of the Czech Academy of Sciences, Chaberska 1014/57, 18200, Prague, Czech Republic
| | - Zdeněk Futera
- Faculty of Science, University of South Bohemia, Branisovska 1760, 37005, Ceske Budejovice, Czech Republic
| | - Veronika Ostatná
- Institute of Biophysics, The Czech Academy of Sciences, v.v.i., Kralovopolska 135, 61200, Brno, Czech Republic
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Havran L, Vacek J, Dorčák V. Free and Bound Histidine in Reactions at Mercury Electrode. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sokolkov SV. Evolution of the analytical signal in electrochemistry from electrocapillary curve to a digital electrochemical pattern of a multicomponent sample. ELECTROCHEMICAL SCIENCE ADVANCES 2022. [DOI: 10.1002/elsa.202100212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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Novák D, Vrba J, Zatloukalová M, Roubalová L, Stolarczyk K, Dorčák V, Vacek J. Cysteamine assay for the evaluation of bioactive electrophiles. Free Radic Biol Med 2021; 164:381-389. [PMID: 33429019 DOI: 10.1016/j.freeradbiomed.2021.01.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 01/04/2021] [Accepted: 01/05/2021] [Indexed: 11/20/2022]
Abstract
Covalent modifications of thiol and amine groups may control the function of proteins involved in the regulatory and signaling pathways of the cell. In this study, we developed a simple cysteamine assay which can be used to study the reactivity of electrophilic compounds towards primary amine and thiol groups in an aqueous environment. The detection principle is based on the electrochemical, photometrical and mass spectrometric analyses of cysteamine (2-aminoethanethiol) as the molecular probe. This technique is useful for studying the reaction kinetics of electrophiles with thiol (SH) and amino (NH2) groups. The decrease in analytical responses of cysteamine was monitored to evaluate the reactivity of three electrophilic activators of the Nrf2 pathway, which mediates the cellular stress response. The SH-reactivity under cell-free conditions of the tested electrophiles decreased in the following order: 4-hydroxy-2-nonenal ≥ nitro-oleic acid > sulforaphane. However, as shown in RAW264.7 cells, the tested compounds activated Nrf2-dependent gene expression in the opposite order: sulforaphane > nitro-oleic acid ≥ 4-hydroxy-2-nonenal. Although other factors in addition to chemical reactivity play a role in biological systems, we conclude that this cysteamine assay is a useful tool for screening potentially bioactive electrophiles and for studying their reactivity at a molecular level.
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Affiliation(s)
- David Novák
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc, 77515, Czech Republic
| | - Jiří Vrba
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc, 77515, Czech Republic.
| | - Martina Zatloukalová
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc, 77515, Czech Republic
| | - Lenka Roubalová
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc, 77515, Czech Republic
| | - Krzysztof Stolarczyk
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc, 77515, Czech Republic; Faculty of Chemistry, University of Warsaw, 1 Pasteura Street, 02-093, Warsaw, Poland
| | - Vlastimil Dorčák
- The Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, Brno, 612 65, Czech Republic
| | - Jan Vacek
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hnevotinska 3, Olomouc, 77515, Czech Republic; The Czech Academy of Sciences, Institute of Biophysics, Kralovopolska 135, Brno, 612 65, Czech Republic.
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Dorčák V, Černocká H, Paleček E. Bovine Serum Albumin Catalysed Hydrogen and Deuterium Evolution at Mercury Electrodes. Chempluschem 2020; 85:1596-1601. [PMID: 33210475 DOI: 10.1002/cplu.202000348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 07/04/2020] [Indexed: 11/09/2022]
Abstract
The hydrogen evolution reaction (HER), catalysed by proteins at mercury electrodes and reflected in chronopotentiometric stripping peak H, provides a label-free and reagentless analytical technique that is sensitive to protein structure. Here we show how the kinetic isotope effect affected the HER catalysed by the protein bovine serum albumin (BSA). We found that the deuteron bond, which is stronger than that of a proton, contributed to less effective transport of deuterons mediated by BSA at the Hg|D2 O interface, and enhanced structural stability of the surface-attached native BSA in D2 O solution. A structural transition was also observed in the surface-attached urea-denatured BSA, and is probably due to the destabilisation of some secondary structural remnants retained by the 17 SS-bonds. Because the catalytically active groups involved in proton or deuteron transfer in native proteins are often exposed towards solutions and their protons exchange almost instantly, no signs of H/D exchange were observed in native BSA using peak H under the given conditions.
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Affiliation(s)
- Vlastimil Dorčák
- Department of Biophysical Chemistry and Molecular Oncology, Institute of Biophysics of the Czech Academy of Sciences, v.v.i., Kralovopolska 135, 612 65, Brno, Czech Republic
| | - Hana Černocká
- Department of Biophysical Chemistry and Molecular Oncology, Institute of Biophysics of the Czech Academy of Sciences, v.v.i., Kralovopolska 135, 612 65, Brno, Czech Republic
| | - Emil Paleček
- Department of Biophysical Chemistry and Molecular Oncology, Institute of Biophysics of the Czech Academy of Sciences, v.v.i., Kralovopolska 135, 612 65, Brno, Czech Republic
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Distinguishing the glycan isomers 2,3-sialyllactose and 2,6-sialyllactose by voltammetry after modification with osmium(VI) complexes. Anal Chim Acta 2019; 1067:56-62. [PMID: 31047149 DOI: 10.1016/j.aca.2019.03.060] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 03/19/2019] [Accepted: 03/28/2019] [Indexed: 11/22/2022]
Abstract
Altered glycosylation is a universal feature of cancer cells and certain glycans are well-known markers of tumor progression. In this work we studied two glycan isomers, 2,3-sialyllactose (3-SL) and 2,6-sialyllactose (6-SL), frequently appearing in glycoproteins connected with cancer. A combination of square wave voltammetry and glycan modification with osmium(VI) N,N,N',N'-tetramethylethylenediamine (Os(VI)tem) allowed to distinguish between these regioisomers, since the 6-SL molecule can bind three Os(VI), while the 3-SL only two Os(VI) moieties, as experiments using capillary electrophoresis, inductively coupled plasma mass spectrometry and thin layer chromatography showed. A similar pattern of Os(VI)-modification was found for isomers of sialyl-N-acetyllactosamine and sialylgalactose. Covalent adducts of Os(VI)tem with glycans yielded three reduction voltammetric peaks. The ratio of peak I/peak II heights depends on the content of individual regioisomer in the sample. Our proposed approach allows the determination of isomer percentage representation in the mixture after one voltammogram recording. These results show a new appropriate method for the discrimination of glycan isomers containing terminal sialic acid important for distinguishing between cancerous and non-cancerous origin of biomarkers.
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Ilimbi D, Buess‐Herman C, Doneux T. Chronopotentiometry as a Sensitive Interfacial Characterisation Tool for Peptide Aptamer Monolayers. ELECTROANAL 2019. [DOI: 10.1002/elan.201900285] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Diane Ilimbi
- Chemistry of Surfaces, Interfaces and Nanomaterials, Faculté des SciencesUniversité libre de Bruxelles (ULB) Boulevard du Triomphe 2, CP 255 B-1050 Bruxelles Belgium
| | - Claudine Buess‐Herman
- Chemistry of Surfaces, Interfaces and Nanomaterials, Faculté des SciencesUniversité libre de Bruxelles (ULB) Boulevard du Triomphe 2, CP 255 B-1050 Bruxelles Belgium
| | - Thomas Doneux
- Chemistry of Surfaces, Interfaces and Nanomaterials, Faculté des SciencesUniversité libre de Bruxelles (ULB) Boulevard du Triomphe 2, CP 255 B-1050 Bruxelles Belgium
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Kroutil O, Kabeláč M, Dorčák V, Vacek J. Structures of Peptidic H‐wires at Mercury Surface: Molecular Dynamics Study. ELECTROANAL 2019. [DOI: 10.1002/elan.201900314] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Ondřej Kroutil
- Institute of Physics and Biophysics, Faculty of ScienceUniversity of South Bohemia Branisovska 1760 370 05 Ceske Budejovice Czech Republic
| | - Martin Kabeláč
- Department of Chemistry, Faculty of ScienceUniversity of South Bohemia Branisovska 31 370 05 Ceske Budejovice Czech Republic
| | - Vlastimil Dorčák
- Institute of Biophysics of the CAS Kralovopolska 135 612 65 Brno Czech Republic
| | - Jan Vacek
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and DentistryPalacky University Hnevotinska 3 775 15 Olomouc Czech Republic
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Affiliation(s)
- Vlastimil Dorčák
- Department of Biophysical Chemistry and Molecular OncologyInstitute of Biophysics of the CAS, v.v.i. Kralovopolska 135 612 65 Brno
| | - Emil Paleček
- Department of Biophysical Chemistry and Molecular OncologyInstitute of Biophysics of the CAS, v.v.i. Kralovopolska 135 612 65 Brno
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Lut H, Galagan R, Petrova T, Karaush N, Minaev B. Development of the Cyclic Reciprocal Derivative Chronopotentiometry with Alternating Current of Different Frequencies. ELECTROANAL 2018. [DOI: 10.1002/elan.201800384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Helen Lut
- Department of Chemistry and Nanomaterials Science; Bohdan Khmelnytsky National University; Cherkasy 18031 Ukraine
| | - Rostislav Galagan
- Department of Chemistry and Nanomaterials Science; Bohdan Khmelnytsky National University; Cherkasy 18031 Ukraine
| | - Tatyana Petrova
- Department of Chemistry and Nanomaterials Science; Bohdan Khmelnytsky National University; Cherkasy 18031 Ukraine
| | - Nataliya Karaush
- Department of Chemistry and Nanomaterials Science; Bohdan Khmelnytsky National University; Cherkasy 18031 Ukraine
| | - Boris Minaev
- Department of Chemistry and Nanomaterials Science; Bohdan Khmelnytsky National University; Cherkasy 18031 Ukraine
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