Artículo
Cyt c6-3: A new isoform of photosynthetic Cyt c6 exclusive to heterocyst-forming cyanobacteria
Autor/es | Torrado Maya, Alejandro
Valladares Ruiz, Ana Puerto Galán, Leonor Hervás Morón, Manuel Navarro Carruesco, José Antonio Molina Heredia, Fernando Publio |
Departamento | Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular |
Fecha de publicación | 2017 |
Fecha de depósito | 2019-07-04 |
Publicado en |
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Resumen | All known cyanobacteria contain Cyt c6, a small soluble electron carrier protein whose main function is to transfer electrons from the Cyt b6 f complex to PSI, although it is also involved in respiration. We have previously ... All known cyanobacteria contain Cyt c6, a small soluble electron carrier protein whose main function is to transfer electrons from the Cyt b6 f complex to PSI, although it is also involved in respiration. We have previously described a second isoform of this protein, the Cyt c6-like, whose function remains unknown. Here we describe a third isoform of Cyt c6 (here called Cytc6-3), which is only found in heterocyst- forming filamentous cyanobacteria. Cyt c6-3 is expressed in vegetative cells but is specifically repressed in heterocysts cells under diazotrophic growth conditions. Although there is a close structural similarity between Cyt c6-3 and Cyt c6 related to the general protein folding, Cyt c6-3 presents differential electrostatic surface features as compared with Cyt c6, its expression is not copper dependent and has a low reactivity towards PSI. According to the different expression pattern, functional reactivity and structural properties, Cyt c6-3 has to play an as yet to be defined regulatory role related to heterocyst differentiation. |
Identificador del proyecto | FIUS05710000
BIO2012-35271 BIO2015-64169-P PAIDI BIO-022 |
Cita | Torrado Maya, A., Valladares Ruiz, A., Puerto Galán, L., Hervás Morón, M., Navarro Carruesco, J.A. y Molina Heredia, F.P. (2017). Cyt c6-3: A new isoform of photosynthetic Cyt c6 exclusive to heterocyst-forming cyanobacteria. Plant and Cell Physiology, 58 (2), 256-265. |
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