Artículo
Iron Deficiency Promotes the Lack of Photosynthetic Cytochrome c550 and Affects the Binding of the Luminal Extrinsic Subunits to Photosystem II in the Diatom Phaeodactylum tricornutum
Autor/es | Castell, Carmen
Díaz Santos, Encarnación Heredia Martínez, Luis G. López Maury, Luis Ortega Rodríguez, José María Navarro, José A. Roncel Gil, Mercedes Hervás Morón, Manuel |
Departamento | Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular |
Fecha de publicación | 2022 |
Fecha de depósito | 2022-11-14 |
Publicado en |
|
Resumen | In the diatom Phaeodactylum tricornutum, iron limitation promotes a decrease in the content of photosystem II, as determined by measurements of oxygen-evolving activity, thermoluminescence, chlorophyll fluorescence analyses ... In the diatom Phaeodactylum tricornutum, iron limitation promotes a decrease in the content of photosystem II, as determined by measurements of oxygen-evolving activity, thermoluminescence, chlorophyll fluorescence analyses and protein quantification methods. Thermoluminescence experiments also indicate that iron limitation induces subtle changes in the energetics of the recombination reaction between reduced QB and the S2/S3 states of the water-splitting machinery. However, electron transfer from QA to QB, involving non-heme iron, seems not to be significantly inhibited. Moreover, iron deficiency promotes a severe decrease in the content of the extrinsic PsbV/cytochrome c550 subunit of photosystem II, which appears in eukaryotic algae from the red photosynthetic lineage (including diatoms) but is absent in green algae and plants. The decline in the content of cytochrome c550 under iron-limiting conditions is accompanied by a decrease in the binding of this protein to photosystem II, and also of the extrinsic PsbO subunit. We propose that the lack of cytochrome c550, induced by iron deficiency, specifically affects the binding of other extrinsic subunits of photosystem II, as previously described in cyanobacterial PsbV mutants. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España Universidad de Sevilla |
Identificador del proyecto | BIO2015-64169-P
US-1380339 |
Cita | Castell, C., Díaz Santos, E., Heredia Martínez, L.G., López Maury, L., Ortega Rodríguez, J.M., Navarro, J.A.,...,Hervás Morón, M. (2022). Iron Deficiency Promotes the Lack of Photosynthetic Cytochrome c550 and Affects the Binding of the Luminal Extrinsic Subunits to Photosystem II in the Diatom Phaeodactylum tricornutum. International Journal of Molecular Sciences, 23 (20), 12138. https://doi.org/10.3390/ijms232012138. |
Ficheros | Tamaño | Formato | Ver | Descripción |
---|---|---|---|---|
Iron Deficiency Promotes.pdf | 1.418Mb | [PDF] | Ver/ | |