Electrochemical studies of binary and ternary copper(II) complexes with α-factor analogues
| Autor: | Urszula E. Wawrzyniak, Wojciech Wróblewski, Iwona Ufnalska, Karolina Bossak-Ahmad, Wojciech Bal |
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| Rok vydání: | 2020 |
| Předmět: |
Indole test
Coordination sphere General Chemical Engineering chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Copper Redox 0104 chemical sciences Analytical Chemistry Metal Crystallography chemistry.chemical_compound chemistry visual_art Electrochemistry visual_art.visual_art_medium Moiety Imidazole 0210 nano-technology Ternary complex |
| Zdroj: | Journal of Electroanalytical Chemistry. 862:114003 |
| ISSN: | 1572-6657 |
| Popis: | Copper(II) binding properties of Saccharomyces cerevisiae pheromone (α-factor) analogues, namely WHWSKNR-am, FHWSKNR-am and WHFSKNR-am amino acid sequences, were studied using voltammetry techniques, fluorescence and UV–Vis spectroscopy. Despite the same 3N binding mode attributed to XHZ-type oligopeptides, the obtained results demonstrated high dependence of the electrochemical properties of their copper(II) complexes on the metal ion coordination environment. Changes triggered by ternary complex formation with imidazole molecule, leading to 4N structure formation, were also examined. The investigated derivatives underwent reduction and oxidation processes as well, however the coordination sphere affected mainly the anodic signal. Different electrochemical responses of α-factor analogues revealed significant influence of tryptophan residue position in a peptide sequence and indicated the complexity of ongoing redox processes. That stems from the presence of two different redox active centers and the possibility of the occurrence of multiple electrostatic interactions engaging charged groups, metal cation and indole moiety. |
| Databáze: | OpenAIRE |
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