Photosynthetica 2018, 56(1):185-191 | DOI: 10.1007/s11099-018-0778-8

The PsbQ' protein affects the redox potential of the QA in photosystem II

M. Yamada1, R. Nagao2, M. Iwai3, Y. Arai1, A. Makita1, H. Ohta4, T. Tomo4,*
1 Graduate School of Science, Tokyo University of Science, Tokyo, Japan
2 Research Institute for Interdisciplinary Science, Okayama University, Okayama, Japan
3 School of Life Science and Technology, Tokyo Institute of Technology, Kanagawa, Japan
4 Faculty of Science, Tokyo University of Science, Tokyo, Japan

Red alga contains four extrinsic proteins in photosystem II (PSII), which are PsbO, PsbV, PsbU, and PsbQ'. Except for the PsbQ', the composition is the same in cyanobacterial PSII. Reconstitution analysis of cyanobacterial PSII has shown that oxygen-evolving activity does not depend on the presence of PsbQ'. Recently, the structure of red algal PSII was elucidated. However, the role of PsbQ' remains unknown. In this study, the function of the acceptor side of PSII was analyzed in PsbQ'-reconstituted PSII by redox titration of QA and thermoluminescence. The redox potential of QA was positively shifted when PsbQ' was attached to the PSII. The positive shift of QA is thought to cause a decrease in the amount of triplet chlorophyll in PSII. On the basis of these results, we propose that PsbQ' has a photoprotective function when irradiated with strong light.

Additional key words: diversity; evolution; photoinhibition; photosynthesis

Received: May 8, 2017; Accepted: August 16, 2017; Published: March 1, 2018  Show citation

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Yamada, M., Nagao, R., Iwai, M., Arai, Y., Makita, A., Ohta, H., & Tomo, T. (2018). The PsbQ' protein affects the redox potential of the QA in photosystem II. Photosynthetica, 56(SPECIAL ISSUE), 185-191. doi: 10.1007/s11099-018-0778-8
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