caa a22 4500 445889896 CHVBK 20180317145612.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s11120-011-9694-5 doi (NATIONALLICENCE)springer-10.1007/s11120-011-9694-5 Cytochrome c 6-like protein as a putative donor of electrons to photosystem I in the cyanobacterium Nostoc sp. PCC 7119 [Elektronische Daten] [Francisco Reyes-Sosa, Jorge Gil-Martínez, Fernando Molina-Heredia] Most organisms performing oxygenic photosynthesis contain either cytochrome c 6 or plastocyanin, or both, to transfer electrons from cytochrome b 6-f to photosystem I. Even though plastocyanin has superseded cytochrome c 6 along evolution, plants contain a modified cytochrome c 6, the so called cytochrome c 6A, whose function still remains unknown. In this article, we describe a second cytochrome c 6 (the so called cytochrome c 6-like protein), which is found in some cyanobacteria but is phylogenetically more related to plant cytochrome c 6A than to cyanobacterial cytochrome c 6. In this article, we conclude that the cytochrome c 6-like protein is a putative electron donor to photosystem I, but does play a role different to that of cytochrome c 6 and plastocyanin as it cannot accept electrons from cytochrome f. The existence of this third electron donor to PSI could explain why some cyanobacteria are able to grow photoautotrophically in the absence of both cytochrome c 6 and plastocyanin. In any way, the Cyt c 6-like protein from Nostoc sp. PCC 7119 would be potentially utilized for the biohydrogen production, using cell-free photosystem I catalytic nanoparticles. Springer Science+Business Media B.V., 2011 Cytochrome c 6-like protein nationallicence Cytochrome c 6A nationallicence Biohydrogen nationallicence Photosystem I nationallicence Spectroscopy nationallicence Laser flash spectroscopy nationallicence Cyt : Cytochrome nationallicence E m : Midpoint redox potential nationallicence k bim : Second-order rate constant nationallicence k et : First-order electron transfer rate constant nationallicence k inf : Bimolecular rate constant extrapolated to infinite ionic strength nationallicence k obs : Observed pseudo-first-order rate constant nationallicence Pc : Plastocyanin nationallicence pI : Isoelectric point nationallicence PSI : Photosystem I nationallicence Reyes-Sosa Francisco Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla y CSIC, Américo Vespucio 49, 41092, Sevilla, Spain aut Gil-Martínez Jorge Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla y CSIC, Américo Vespucio 49, 41092, Sevilla, Spain aut Molina-Heredia Fernando Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla y CSIC, Américo Vespucio 49, 41092, Sevilla, Spain aut Photosynthesis Research Springer Netherlands 110/1(2011-10-01), 61-72 0166-8595 110:1<61 2011 110 11120 https://doi.org/10.1007/s11120-011-9694-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11120-011-9694-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Reyes-Sosa Francisco Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla y CSIC, Américo Vespucio 49, 41092, Sevilla, Spain aut NATIONALLICENCE 700 1- Gil-Martínez Jorge Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla y CSIC, Américo Vespucio 49, 41092, Sevilla, Spain aut NATIONALLICENCE 700 1- Molina-Heredia Fernando Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla y CSIC, Américo Vespucio 49, 41092, Sevilla, Spain aut NATIONALLICENCE 773 0- Photosynthesis Research Springer Netherlands 110/1(2011-10-01), 61-72 0166-8595 110:1<61 2011 110 11120 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer