Regulation of excitation energy transfer in diatom PSII dimer: How does it change the destination of excitation energy?

Makio Yokono, Ryo Nagao, Tatsuya Tomo, Seiji Akimoto

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Abstract Energy transfer dynamics in dimeric photosystem II (PSII) complexes isolated from four diatoms, Chaetoceros gracilis, Cyclotella meneghiniana, Thalassiosira pseudonana, and Phaeodactylum tricornutum, are examined. Time-resolved fluorescence measurements were conducted in the range of 0-80 ns. Delayed fluorescence spectra showed a clear difference between PSII monomer and PSII dimer isolated from the four diatoms. The difference can be interpreted as reflecting suppressed energy transfer between PSII monomers in the PSII dimer for efficient energy trapping at the reaction center. The observation was especially prominent in C. gracilis and T. pseudonana. The pathways seem to be suppressed under a low pH condition in isolated PSII complexes from C. gracilis, and excitation energy may be quenched with fucoxanthin chlorophyll a/c-binding protein (FCP) that was closely associated with PSII in C. gracilis. The energy transfer between PSII monomers in the PSII dimer may play a role in excitation energy regulation in diatoms.

Original languageEnglish
Article number47503
Pages (from-to)1274-1282
Number of pages9
JournalBiochimica et Biophysica Acta - Bioenergetics
Volume1847
Issue number10
DOIs
Publication statusPublished - Jul 25 2015
Externally publishedYes

Keywords

  • Abbreviations PSI photosystem I
  • Chl chlorophyll
  • FCP fucoxanthin chlorophyll a/c-binding protein
  • FDAS fluorescence decay-associated spectrum
  • PSII photosystem II
  • RC reaction center
  • TRFS time-resolved fluorescence spectra

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

Fingerprint Dive into the research topics of 'Regulation of excitation energy transfer in diatom PSII dimer: How does it change the destination of excitation energy?'. Together they form a unique fingerprint.

  • Cite this