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Título

Interaction of photosystem I from Phaeodactylum tricornutum with plastocyanins as compared with its native cytochrome c6: Reunion with a lost donor

AutorBernal-Bayard, P. CSIC ORCID ; Pallara, Chiara; Castell, M. Carmen; Molina-Heredia, Fernando P. CSIC ORCID ; Fernández-Recio, Juan CSIC ORCID ; Hervás, Manuel CSIC ORCID; Navarro, José A. CSIC ORCID
Palabras claveCytochrome c6
Electron transfer;
Computational docking
Laser flash photolysis
Phaeodactylum
Photosystem I
Plastocyanin
Fecha de publicación2015
EditorElsevier
CitaciónBiochimica et Biophysica Acta - Bioenergetics, 1847(12): 1549-1559 (2015)
ResumenIn the Phaeodactylum tricornutum alga, as in most diatoms, cytochrome c6 is the only electron donor to photosystem I, and thus they lack plastocyanin as an alternative electron carrier. We have investigated, by using laser-flash absorption spectroscopy, the electron transfer to Phaeodactylum photosystem I from plastocyanins from cyanobacteria, green algae and plants, as compared with its own cytochrome c6. Diatom photosystem I is able to effectively react with eukaryotic acidic plastocyanins, although with less efficiency than with Phaeodactylum cytochrome c6. This efficiency, however, increases in some green alga plastocyanin mutants mimicking the electrostatics of the interaction site on the diatom cytochrome. In addition, the structure of the transient electron transfer complex between cytochrome c6 and photosystem I from Phaeodactylum has been analyzed by computational docking and compared to that of green lineage and mixed systems. Taking together, the results explain why the Phaeodactylum system shows a lower efficiency than the green systems, both in the formation of the properly arranged [cytochrome c6-photosystem I] complex and in the electron transfer itself.
Versión del editorhttp://dx.doi.org/10.1016/j.bbabio.2015.09.006
URIhttp://hdl.handle.net/10261/122824
DOI10.1016/j.bbabio.2015.09.006
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