Abstract
The rapid turnover of photosystem II (PSII) in diatoms is thought to be at an exceptionally high rate compared with other oxyphototrophs; however, its molecular mechanisms are largely unknown. In this study, we examined the photodamage and repair processes of PSII in the marine centric diatom Chaetoceros gracilis incubated at 30 or 300 μmol photons m−2 s−1 in the presence of a de novo protein-synthesis inhibitor. When de novo protein synthesis was blocked by chloramphenicol (Cm), oxygen-evolving activity gradually decreased even at 30 μmol photons m−2 s−1 and could not be detected at 12 h. PSII inactivation was enhanced by higher illumination. Using Cm-treated cells, the conversion of PSII dimer to monomers was observed by blue native PAGE. The rate of PSII monomerization was very similar to that of the decrease in oxygen-evolving activity under both light conditions. Immunological detection of D1 protein in the Cm-treated cells showed that the rate of D1 degradation was slower than that of the former two events, although it was more rapid than that observed in other oxyphototrophs. Thus, the three accelerated events, especially PSII monomerization, appear to cause the unusually high rate of PSII turnover in diatoms.
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Abbreviations
- BN-PAGE:
-
Blue native PAGE
- Chl:
-
Chlorophyll
- Cm:
-
Chloramphenicol
- FCP:
-
Fucoxanthin chlorophyll a/c-binding protein
- HL:
-
High light
- LL:
-
Low light
- MES:
-
2-(N-morpholino)ethanesulfonic acid
- PS:
-
Photosystem
- RC:
-
Reaction center
- RubisCO:
-
Ribulose 1,5-bisphosphate carboxylase/oxygenase
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Acknowledgments
This work was supported in part by Grants-in-Aid for Scientific Research from the Ministry of Education of Japan (No. 24370025, 26220801 to T.T., No. 17657013, 20370018, 21657013 to M.I.), by a grant from JST PRESTO to T.T., by a grant from Australian Research Council’s Discovery Projects funding scheme (project number DP12101360) to T.T., and by the Global COE program (From the Earth to ‘Earths’) to M.I.
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Nagao, R., Tomo, T., Narikawa, R. et al. Conversion of photosystem II dimer to monomers during photoinhibition is tightly coupled with decrease in oxygen-evolving activity in the diatom Chaetoceros gracilis . Photosynth Res 130, 83–91 (2016). https://doi.org/10.1007/s11120-016-0226-1
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DOI: https://doi.org/10.1007/s11120-016-0226-1