Artículo
The singular properties of photosynthetic cytochrome c 550 from the diatom Phaeodactylum tricornutum suggest new alternative functions
Autor/es | Bernal Bayard, Pilar
Álvarez Núñez, Consolación Calvo Ruiz, Purificación Castell, M. Carmen Roncel Gil, Mercedes Hervás Morón, Manuel Navarro Carruesco, José Antonio |
Departamento | Universidad de Sevilla. Departamento de Microbiología Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular |
Fecha de publicación | 2019 |
Fecha de depósito | 2019-05-28 |
Publicado en |
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Resumen | Cytochrome c 550 is an extrinsic component in the luminal side of photosystem II (PSII) in cyanobacteria, as well as in eukaryotic algae from the red photosynthetic lineage including, among others, diatoms. We have established ... Cytochrome c 550 is an extrinsic component in the luminal side of photosystem II (PSII) in cyanobacteria, as well as in eukaryotic algae from the red photosynthetic lineage including, among others, diatoms. We have established that cytochrome c 550 from the diatom Phaeodactylum tricornutum can be obtained as a complete protein from the membrane fraction of the alga, although a C-terminal truncated form is purified from the soluble fractions of this diatom as well as from other eukaryotic algae. Eukaryotic cytochromes c 550 show distinctive electrostatic features as compared with cyanobacterial cytochrome c 550 . In addition, co-immunoseparation and mass spectrometry experiments, as well as immunoelectron microscopy analyses, indicate that although cytochrome c 550 from P. tricornutum is mainly located in the thylakoid domain of the chloroplast – where it interacts with PSII –, it can also be found in the chloroplast pyrenoid, related with proteins linked to the CO 2 concentrating mechanism and assimilation. These results thus suggest new alternative functions of this heme protein in eukaryotes. |
Identificador del proyecto | BIO2015-64169-P
PAIDI BIO-022 |
Cita | Bernal Bayard, P., Álvarez Núñez, C., Calvo Ruiz, P., Castell, M.C., Roncel, M., Hervás Morón, M. y Navarro Carruesco, J.A. (2019). The singular properties of photosynthetic cytochrome c 550 from the diatom Phaeodactylum tricornutum suggest new alternative functions. Physiologia Plantarum, 16 (1), 199-210. |
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