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

M. Wahadoszamen, A. Ghazaryan, H.E. Cingil, A.M. Ara, C. Büchel, R. Van Grondelle, R. Berera

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)
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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.

Original languageEnglish
Pages (from-to)193-200
Number of pages8
JournalBiochimica et Biophysica Acta, Bioenergetics
Volume1837
Issue number1
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • Charge transfer states
  • Diatoms
  • Energy dissipation
  • Light harvesting antenna
  • Nonphotochemical quenching
  • Stark spectroscopy

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