期刊
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
卷 1847, 期 10, 页码 1274-1282出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbabio.2015.07.006
关键词
PSII dimer; Energy transfer; Quench; Time-resolved fluorescence; Diatom
资金
- Ministry of Education of Japan [24370025, 26220801]
- Grants-in-Aid for Scientific Research [26220801] Funding Source: KAKEN
Energy transfer dynamics in dimeric photosystem II (PSII) complexes isolated from four diatoms, Chaetoceros gracilis, Cyclotella meneghiniana, Thalassiosira pseudonana, and Phaeodactylum tricornutum, are examined. Time-resolved fluorescence measurements were conducted in the range of 0-80 ns. Delayed fluorescence spectra showed a clear difference between PSII monomer and PSII dimer isolated from the four diatoms. The difference can be interpreted as reflecting suppressed energy transfer between PSII monomers in the PSII dimer for efficient energy trapping at the reaction center. The observation was especially prominent in C gracilis and T. pseudonana. The pathways seem to be suppressed under a low pH condition in isolated PSII complexes from C. gracilis, and excitation energy may be quenched with fucoxanthin chlorophyll a/c-binding protein (FCP) that was closely associated with PSII in C gracilis. The energy transfer between PSII monomers in the PSII dimer may play a role in excitation energy regulation in diatoms. (C) 2015 Elsevier B.V. All rights reserved.
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