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The photosynthetic cytochrome c 550 from the diatom Phaeodactylum tricornutum

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Abstract

The photosynthetic cytochrome c 550 from the marine diatom Phaeodactylum tricornutum has been purified and characterized. Cytochrome c 550 is mostly obtained from the soluble cell extract in relatively large amounts. In addition, the protein appeared to be truncated in the last hydrophobic residues of the C-terminus, both in the soluble cytochrome c 550 and in the protein extracted from the membrane fraction, as deduced by mass spectrometry analysis and the comparison with the gene sequence. Interestingly, it has been described that the C-terminus of cytochrome c 550 forms a hydrophobic finger involved in the interaction with photosystem II in cyanobacteria. Cytochrome c 550 was almost absent in solubilized photosystem II complex samples, in contrast with the PsbO and Psb31 extrinsic subunits, thus suggesting a lower affinity of cytochrome c 550 for the photosystem II complex. Under iron-limiting conditions the amount of cytochrome c 550 decreases up to about 45% as compared to iron-replete cells, pointing to an iron-regulated synthesis. Oxidized cytochrome c 550 has been characterized using continuous wave EPR and pulse techniques, including HYSCORE, and the obtained results have been interpreted in terms of the electrostatic charge distribution in the surroundings of the heme centre.

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Abbreviations

ß-DM:

ß-dodecyl-maltoside

Cc550 :

Cytochrome c 550

Cc6 :

Cytochrome c 6

CW:

Continuous wave

EPR:

Electron paramagnetic resonance

HYSCORE:

Hyperfine sublevel correlation spectroscopy

MALDI-TOF MS:

Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

PSII:

Photosystem II

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Acknowledgements

The authors thank Rocío Rodríguez (Proteomic Service, IBVF) for technical assistance, and Prof. Tatsuya Tomo (Tokyo University of Science, Japan) for the Psb31 antibodies.

Funding

This work was supported by the Spanish Ministry of Economy and Competitiveness (BIO2012-35271, BIO2015-64169-P, MAT2011-23861 and CTQ2015-64486-R) the Andalusian Government (PAIDI BIO-022) and the Aragón Government (Grupo consolidado B-18). All these grants were partially financed by the EU FEDER Program.

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Authors and Affiliations

  1. Instituto de Bioquímica Vegetal y Fotosíntesis, Centro de Investigaciones Científicas Isla de la Cartuja, Universidad de Sevilla & CSIC, Américo Vespucio 49, 41092, Sevilla, Spain

    Pilar Bernal-Bayard, Leonor Puerto-Galán, Carmen Castell, José M. Ortega, Mercedes Roncel, Manuel Hervás & José A. Navarro

  2. Estación Experimental de Aula Dei, EEAD-CSIC, Zaragoza, Spain

    Inmaculada Yruela

  3. Centro Universitario de la Defensa, Zaragoza, Spain

    Inés García-Rubio & Jesús I. Martínez

  4. Laboratory of Physical Chemistry, ETH Zurich, Zurich, Switzerland

    Inés García-Rubio

  5. Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza & CSIC, Zaragoza, Spain

    Pablo J. Alonso & Jesús I. Martínez

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  1. Pilar Bernal-Bayard
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  2. Leonor Puerto-Galán
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Correspondence to José A. Navarro.

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Bernal-Bayard, P., Puerto-Galán, L., Yruela, I. et al. The photosynthetic cytochrome c 550 from the diatom Phaeodactylum tricornutum . Photosynth Res 133, 273–287 (2017). https://doi.org/10.1007/s11120-016-0327-x

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