Control mechanism of excitation energy transfer in a complex consisting of photosystem II and fucoxanthin chlorophyll a/c-binding protein

Ryo Nagao, Makio Yokono, Tatsuya Tomo, Seiji Akimoto

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Fucoxanthin chlorophyll (Chl) a/c-binding protein (FCP) is a unique light-harvesting antenna in diatoms, which are photosynthesizing algae ubiquitous in aquatic environments. However, it is unknown how excitation energy is trapped and quenched in a complex consisting of photosystem II and FCP (PSII-FCPII complex). Here, we report the control mechanism of excitation energy transfer in the PSII-FCPII complexes isolated from a diatom, Chaetoceros gracilis, as revealed by picosecond timeresolved fluorescence spectroscopy. The results showed that Chl-excitation energy is harvested in low-energy Chls near/within FCPII under the 77 K conditions, whereas most of the energy is trapped in reaction center Chls in PSII under the 283 K conditions. Surprisingly, excitation energy quenching was observed in a part of PSII- FCPII complexes with the time constants of hundreds of picosecond, thus indicating the large contribution of FCPII to energy trapping and quenching. On the basis of these results, we discuss the light-harvesting strategy of diatoms. SECTION: Energy Conversion and Storage; Energy and Charge Transport

Original languageEnglish
Pages (from-to)2983-2987
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume5
Issue number17
DOIs
Publication statusPublished - Sep 4 2014
Externally publishedYes

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Chlorophyll Binding Proteins
Photosystem II Protein Complex
Excitation energy
chlorophylls
Chlorophyll
Energy transfer
energy transfer
proteins
algae
excitation
Quenching
energy
Fluorescence spectroscopy
Algae
Energy conversion
Energy storage
Charge transfer
quenching
Antennas
energy conversion

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Control mechanism of excitation energy transfer in a complex consisting of photosystem II and fucoxanthin chlorophyll a/c-binding protein. / Nagao, Ryo; Yokono, Makio; Tomo, Tatsuya; Akimoto, Seiji.

In: Journal of Physical Chemistry Letters, Vol. 5, No. 17, 04.09.2014, p. 2983-2987.

Research output: Contribution to journalArticle

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