Abstract
Iron is an essential limiting factor for primary production in many marine systems. The present study investigated differential regulation of protein expression in marine phytoplankton Prymnesium parvum under low Fe concentration. The phytoplankton was grown in f/2 culture medium in artificial seawater with low (0.0025 μM) and high (0.05 μM) Fe concentrations. Two-dimensional differential gel electrophoresis and matrix-assisted laser desorption-ionization-time of flight-mass spectrometer analysis were performed for protein identification and characterization. The growth of the alga declined substantially under the low Fe compared to the high Fe concentration. Under low Fe conditions, P. parvum upregulated 10 proteins including chloroplastic ATP synthase subunit b, D2 protein of PSII, D1 protein of PSII reaction centre, and light harvesting complex II protein, most of which are associated with photosynthetic activities in PSII. The results suggest that the marine alga P. parvum altered the biosynthesis of several photosynthetic proteins in order to cope with low Fe conditions.
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Abbreviations
- 2-D DIGE:
-
2-dimensional differential gel electrophoresis
- Chl:
-
chlorophyll
- HF:
-
high Fe concentration
- IEF:
-
isoelectric focusing
- LF:
-
low Fe concentration
- MALDI-TOF-MS:
-
matrix-assisted laser desorption-ionization-time of flight-mass spectrometer
- NCBI:
-
National Center for Biotechnology Information
- OD:
-
optical density
- OEE:
-
oxygen-evolving enhancer
- PBS:
-
phosphate buffer saline
- PQ:
-
plastoquinon
- ROS:
-
reactive oxygen species
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Acknowledgements: This research was financially supported by a Grant-in-Aid (K2319) for scientific research from the Ministry of the Environment, Japan. The authors would like to thank Dr. Luigi De Filippis, School of the Environmental, University Technology Sydney (UTS), Australia, for reviewing this manuscript prior to submission. The authors highly appreciate the editor and the anonymous reviewers for their comments and suggestions that improved the quality of the paper substantially.
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Rahman, M.M., Rahman, M.A., Maki, T. et al. A marine phytoplankton Prymnesium parvum upregulates the component proteins of photosystem II under iron stress. Photosynthetica 53, 136–143 (2015). https://doi.org/10.1007/s11099-015-0095-4
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DOI: https://doi.org/10.1007/s11099-015-0095-4