Abstract
Photosystem I (PSI) catalyzes light-induced electron-transfer reactions and has been observed to exhibit various oligomeric states and different energy levels of chlorophylls (Chls) in response to oligomerization. However, the biochemical and spectroscopic properties of a PSI monomer containing Chls d are not well understood. In this study, we successfully isolated and characterized PSI monomers from the cyanobacterium Acaryochloris marina MBIC11017, and compared their properties with those of the A. marina PSI trimer. The PSI trimers and monomers were prepared using trehalose density gradient centrifugation after anion-exchange and hydrophobic interaction chromatography. The polypeptide composition of the PSI monomer was found to be consistent with that of the PSI trimer. The absorption spectrum of the PSI monomer showed the Qy band of Chl d at 704 nm, which was blue-shifted from the peak at 707 nm observed in the PSI-trimer spectrum. The fluorescence-emission spectrum of the PSI monomer measured at 77 K exhibited a peak at 730 nm without a broad shoulder in the range of 745–780 nm, which was clearly observed in the PSI-trimer spectrum. These spectroscopic properties of the A. marina PSI trimer and monomer suggest different formations of low-energy Chls d between the two types of PSI cores. Based on these findings, we discuss the location of low-energy Chls d in A. marina PSIs.
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All data supporting the findings of this study are available within the paper and its Supplementary Information.
Change history
26 May 2023
The Abbreviations were corrected from ‘Car Catrenoid’ to ‘Car Carotenoid’.
Abbreviations
- β-DDM:
-
n-Dodecyl-β-D-maltoside
- Car:
-
Carotenoid
- Chl:
-
Chlorophyll
- PPFD:
-
Photosynthetic photon flux density
- PS:
-
Photosystem
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Acknowledgements
We thank Ms. Kumiyo Kato and Ms. Satoko Kakiuchi for her assistance in this study. This work was supported by JSPS KAKENHI grant Nos. JP21K19085 (R.N.), JP20H02914 (K.K.), JP21K06101 (T.T.), and JP22H04916 (J.-R.S.).
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Japan Society for the Promotion of Science, JP21K19085, JP20H02914, JP21K06101, JP22H04916
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R.N. conceived the project; R.T. and T.T. provided the cells; R.N. prepared the trimeric and monomeric PSI cores; R.N., H.O., and N.T. analyzed their biochemical and spectroscopic properties; R.N., K.K., T.T., and J.-R.S. provided experimental and funding resorces; R.N. wrote the manuscript, and all of the authors joined the discussion of the results.
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Nagao, R., Ogawa, H., Tsuboshita, N. et al. Isolation and characterization of trimeric and monomeric PSI cores from Acaryochloris marina MBIC11017. Photosynth Res 157, 55–63 (2023). https://doi.org/10.1007/s11120-023-01025-x
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DOI: https://doi.org/10.1007/s11120-023-01025-x