Artículo
Voltammetric study of the adsorbed thermophilic plastocyanin from Phormidium laminosum up to 90 °c
Autor/es | Olloqui Sariego, José Luis
Frutos Beltrán, Estrella Roldán González, Emilio Rosa Acosta, Miguel Ángel de la Calvente Pacheco, Juan José Díaz Quintana, Antonio Jesús Andreu Fondacabe, Rafael Jesús |
Departamento | Universidad de Sevilla. Departamento de Química Física |
Fecha de publicación | 2012 |
Fecha de depósito | 2018-03-15 |
Publicado en |
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Resumen | Redox thermodynamics and kinetics of plastocyanin from Phormidium laminosum, and of azurin from Pseudonomas aeruginosa, have been investigated as a function of temperature by protein film voltammetry. To this purpose, both ... Redox thermodynamics and kinetics of plastocyanin from Phormidium laminosum, and of azurin from Pseudonomas aeruginosa, have been investigated as a function of temperature by protein film voltammetry. To this purpose, both proteins have been physisorbed on a pyrolytic graphite edge electrode. A pronounced negative shift of the plastocyanin standard potential, compared to a slight shift in the case of azurin, has been found upon increasing the temperature. Hence, significant conformational and/or solvation changes accompany the redox conversion of plastocyanin. Lower electron transfer rate constants (by c.a. one order of magnitude) and higher activation enthalpies have been found for plastocyanin as compared to azurin. The voltammetric response of azurin vanishes irreversibly at temperatures close to 60 °C, whereas the redox properties of plastocyanin remain unaltered, except for some loss of electroactive protein, after heating the electrode at temperatures as high as 90 °C. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España Junta de Andalucía |
Identificador del proyecto | CTQ 2008-00371
BFU2009-07190 P07-FQM-02492 P06-CVI-01713 |
Cita | Olloqui Sariego, J.L., Frutos Beltrán, E., Roldán González, E., Rosa Acosta, M.Á.d.l., Calvente Pacheco, J.J., Díaz Quintana, A.J. y Andreu Fondacabe, R.J. (2012). Voltammetric study of the adsorbed thermophilic plastocyanin from Phormidium laminosum up to 90 °c. Electrochemistry Communications, 19, 105-107. |
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