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Diel regulation of photosynthetic activity in the oceanic unicellular diazotrophic cyanobacterium Crocosphaera watsonii WH8501
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SYSNO ASEP 0489049 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Diel regulation of photosynthetic activity in the oceanic unicellular diazotrophic cyanobacterium Crocosphaera watsonii WH8501 Author(s) Masuda, Takako (MBU-M) ORCID
Bernát, Gábor (MBU-M) ORCID
Bečková, Martina (MBU-M) RID
Kotabová, Eva (MBU-M) RID, ORCID
Lawrenz, Evelyn (MBU-M) RID
Lukeš, Martin (MBU-M) ORCID
Komenda, Josef (MBU-M) RID, ORCID
Prášil, Ondřej (MBU-M) RID, ORCIDSource Title Environmental Microbiology. - : Wiley - ISSN 1462-2912
Roč. 20, č. 2 (2018), s. 546-560Number of pages 15 s. Language eng - English Country US - United States Keywords NORTH PACIFIC-OCEAN ; SYNECHOCYSTIS SP PCC-6803 ; PHOTOSYSTEM-II Subject RIV EE - Microbiology, Virology OECD category Microbiology R&D Projects LO1416 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) ED2.1.00/19.0392 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA16-15467S GA ČR - Czech Science Foundation (CSF) Institutional support MBU-M - RVO:61388971 UT WOS 000425019400010 EID SCOPUS 85040045146 DOI 10.1111/1462-2920.13963 Annotation The oceanic unicellular diazotrophic cyanobacterium Crocosphaera watsonii WH8501 exhibits large diel changes in abundance of both Photosystem II (PSII) and Photosystem I (PSI). To understand the mechanisms underlying these dynamics, we assessed photosynthetic parameters, photosystem abundance and composition, and chlorophyll-protein biosynthesis over a diel cycle. Our data show that the decline in PSII activity and abundance observed during the dark period was related to a light-induced modification of PSII, which, in combination with the suppressed synthesis of membrane proteins, resulted in monomerization and gradual disassembly of a large portion of PSII core complexes. In the remaining population of assembled PSII monomeric complexes, we detected the non-functional version of the D1 protein, rD1, which was absent in PSII during the light phase. During the dark period, we also observed a significant decoupling of phycobilisomes from PSII and a decline in the chlorophyll a quota, which matched the complete loss of functional PSIIs and a substantial decrease in PSI abundance. However, the remaining PSI complexes maintained their photochemical activity. Thus, during the nocturnal period of nitrogen fixation C. watsonii operates a suite of regulatory mechanisms for efficient utilization/recycling of cellular resources and protection of the nitrogenase enzyme. Workplace Institute of Microbiology Contact Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231 Year of Publishing 2019
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