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An evolutionary analysis of the reaction mechanisms of photosystem I reduction by cytochrome c6 and plastocyanin

 

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Opened Access An evolutionary analysis of the reaction mechanisms of photosystem I reduction by cytochrome c6 and plastocyanin
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Author: Rosa Acosta, Miguel Ángel de la
Navarro Carruesco, José Antonio
Díaz Quintana, Antonio Jesús
Cerda Haynes, Berta de la
Molina Heredia, Fernando Publio
Balme, Alexis
Murdoch, Piedad del Socorro
Díaz Moreno, Irene
Durán, Raúl V.
Hervás Morón, Manuel
Department: Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular
Date: 2002
Published in: Bioelectrochemistry, 55 (1-2), 41-45.
Document type: Article
Abstract: Photosystem I reduction by the soluble metalloproteins cytochrome c6 and plastocyanin, which are alternatively synthesized by some photosynthetic organisms depending on the relative availability of copper and iron, has been investigated in cyanobacteria, green algae and plants. The reaction mechanism is classified in three different types on the basis of the affinity of the membrane complex towards its electron donor protein. The role of electrostatic interactions in forming an intermediate transient complex, as well as the structural and functional similarities of cytochrome c6 and plastocyanin are analysed from an evolutionary point of view. The proposal made is that the heme protein was first “discovered” by nature, when iron was much more abundant on the Earth's surface, and replaced by plastocyanin when copper became available because of the oxidizing conditions of the new atmosphere.
Cite: Rosa Acosta, M.Á.d.l., Navarro Carruesco, J.A., Díaz Quintana, A.J., Cerda Haynes, B.d.l., Molina Heredia, F.P., Balme, A.,...,Hervás Morón, M. (2002). An evolutionary analysis of the reaction mechanisms of photosystem I reduction by cytochrome c6 and plastocyanin. Bioelectrochemistry, 55 (1-2), 41-45.
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URI: https://hdl.handle.net/11441/84934

DOI: 10.1016/S1567-5394(01)00136-0

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