Stark fluorescence spectroscopy reveals two emitting sites in the dissipative state of FCP antennas

M.D. Wahadoszamen, A. Ghazaryan, E.H. Cingil, A. Mane Ara, C. Buchel, R. van Grondelle, R. Berera

Research output: Contribution to JournalArticle

Abstract

Diatoms are characterized by very efficient photoprotective mechanisms where the excess energy is dissipated as heat in the main antenna system constituted by fucoxanthin-chlorophyll (Chl) protein complexes (FCPs). We performed Stark fluorescence spectroscopy on FCPs in their light-harvesting and energy dissipating states. Our results show that two distinct emitting bands are created upon induction of energy dissipation in FCPa and possibly in FCPb. More specifically one band is characterized by broad red shifted emission above 700 nm and bears strong similarity with a red shifted band that we detected in the dissipative state of the major light-harvesting complex II (LHCII) of plants [26]. We discuss the results in the light of different mechanisms proposed to be responsible for photosynthetic photoprotection. © 2013 Elsevier B.V.
Original languageEnglish
Pages (from-to)193-200
JournalBiochimica et Biophysica Acta (BBA) - Bioenergetics
Volume1837
DOIs
Publication statusPublished - 2013

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