2018•Proceedings of the National Academy of SciencesOpen access
LHCSR1-dependent fluorescence quenching is mediated by excitation energy transfer from LHCII to photosystem I in Chlamydomonas reinhardtii
Kotaro Kosuge, Ryutaro Tokutsu, Eunchul Kim, Seiji Akimoto, Makio Yokono, Yoshifumi Ueno, Jun Minagawa
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Abstract
Significance Unlike another effector protein for algal nonphotochemical quenching (NPQ)—LIGHT HARVESTING COMPLEX II STRESS RELATED PROTEIN 3 (LHCSR3)—the role of LHCSR1 in NPQ has been very limited. In this report, we studied the fluorescence quenching event occurring in the presence and the absence of LHCSR1 and demonstrated that there is a significant excitation energy transfer from Light-harvesting complex II (LHCII) to Photosystem I (PSI), and not only to Photosystem II, upon activation of LHCSR1 by low pH. The results suggest another layer of photoprotection mechanism based on this UV-inducible protein LHCSR1.