Abstract
The major light-harvesting pigment protein complex (fucoxanthin–chlorophyll-binding protein complex; FCP) was purified from a marine centric diatom, Chaetoceros gracilis, by mild solubilization followed by sucrose density gradient centrifugation, and then characterized. The dynamic light scattering measurement showed unimodality, indicating that the complex was highly purified. The amount of chlorophyll a (Chl a) bound to the purified FCP accounted for more than 60 % of total cellular Chl a. The complex was composed of three abundant polypeptides, although there are nearly 30 FCP-related genes. The two major components were identified as Fcp3 (Lhcf3)- and Fcp4 (Lhcf4)-equivalent proteins based on their internal amino acid sequences and a two-dimensional isoelectric focusing electrophoresis analysis developed in this work. Compared with the thylakoids, the FCP complex showed higher contents of fucoxanthin and chlorophyll c but lower contents of the xanthophyll cycle pigments diadinoxanthin and diatoxanthin. Fluorescence excitation spectra analyses indicated that light harvesting, rather than photosystem protection, is the major function of the purified FCP complex, which is associated with more than 60 % of total cellular Chl a. These findings suggest that the huge amount of Chl bound to the FCP complex composed of Lhcf3, Lhcf4, and an unidentified minor protein has a light-harvesting function to allow efficient photosynthesis under the dim-light conditions in the ocean.
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Abbreviations
- Chl:
-
Chlorophyll
- DDM:
-
n-Dodecyl-β-d-maltopyranoside
- FCP:
-
Fucoxanthin–chlorophyll-binding protein
- GRAVY:
-
Grand average hydropathicity
- HTG:
-
n-Heptyl-β-d-thioglucoside
- IPG:
-
Immobilized pH gradient
- MALDI-TOF:
-
Matrix-assisted laser desorption ionization-time of flight mass spectroscopy
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Acknowledgments
This work was supported by the Japan Science and Technology Agency (JST), the Advanced Low Carbon Technology Research and Development Program (ALCA; to K. I., E. Y., and Y. K.) and the Adaptable and Seamless Technology Transfer Program through Target-driven Research and Development (A-STEP; to Y. K.). This work was also supported by a grant-in-aid from the Japan Society for the Promotion of Science (Grant 25740054 to N. I.-K.) and a Sasakawa Scientific Research Grant from The Japan Science Society (24-444 to T. I.).
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Ishihara, T., Ifuku, K., Yamashita, E. et al. Utilization of light by fucoxanthin–chlorophyll-binding protein in a marine centric diatom, Chaetoceros gracilis . Photosynth Res 126, 437–447 (2015). https://doi.org/10.1007/s11120-015-0170-5
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DOI: https://doi.org/10.1007/s11120-015-0170-5