Abstract
Light-harvesting complexes (LHCs) have been diversified in oxygenic photosynthetic organisms, and play an essential role in capturing light energy which is transferred to two types of photosystem cores to promote charge-separation reactions. Red algae are one of the groups of photosynthetic eukaryotes, and their chlorophyll (Chl) a-binding LHCs are specifically associated with photosystem I (PSI). In this study, we purified three types of preparations, PSI-LHCI supercomplexes, PSI cores, and isolated LHCIs, from the red alga Cyanidium caldarium, and examined their properties. The polypeptide bands of PSI-LHCI showed characteristic PSI and LHCI components without contamination by other proteins. The carotenoid composition of LHCI displayed zeaxanthins, β-cryptoxanthins, and β-carotenes. Among the carotenoids, zeaxanthins were enriched in LHCI. On the contrary, both zeaxanthins and β-cryptoxanthins could not be detected from PSI, suggesting that zeaxanthins and β-cryptoxanthins are bound to LHCI but not PSI. A Qy peak of Chl a in the absorption spectrum of LHCI was shifted to a shorter wavelength than those in PSI and PSI-LHCI. This tendency is in line with the result of fluorescence-emission spectra, in which the emission maxima of PSI-LHCI, PSI, and LHCI appeared at 727, 719, and 677 nm, respectively. Time-resolved fluorescence spectra of LHCI represented no 719 and 727-nm fluorescence bands from picoseconds to nanoseconds. These results indicate that energy levels of Chls around/within LHCIs and within PSI are changed by binding LHCIs to PSI. Based on these findings, we discuss the expression, function, and structure of red algal PSI-LHCI supercomplexes.
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Abbreviations
- β-DDM:
-
n-Dodecyl-β-d-maltoside
- Chl:
-
Chlorophyll
- LHC:
-
Light-harvesting complex
- LHCI:
-
LHC specific to PSI
- PS:
-
Photosystem
- TRF:
-
Time-resolved fluorescence
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Acknowledgements
We thank Ms. Kumiyo Kato for her assistance in this study. This work was supported by JSPS KAKENHI grant Nos. JP21K19085 (R.N.), JP20H02914 (K.K.), and JP17H06434 and JP22H04916 (J.-R.S.).
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This study was supported by Japan Society for the Promotion of Science (Grant Nos. JP21K19085, JP20H02914, JP17H06434, JP22H04916).
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R.N. conceived the project; R.N. purified the three types of preparations and analyzed their biochemical characterization; R.N. measured absorption and fluorescence spectra; Y.U. measured time-resolved fluorescence; M.F. and S.A. analyzed time-resolved fluorescence data; R.N., K.K., J.-R.S., and S.A. provided experimental and funding resources; and R.N. and S.A. wrote the manuscript, and all of the authors joined the discussion of the results.
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Nagao, R., Ueno, Y., Furutani, M. et al. Biochemical and spectroscopic characterization of PSI-LHCI from the red alga Cyanidium caldarium. Photosynth Res 156, 315–323 (2023). https://doi.org/10.1007/s11120-023-00999-y
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DOI: https://doi.org/10.1007/s11120-023-00999-y