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Photosynthesis supported by a chlorophyll f-dependent, entropy-driven uphill energy transfer in Halomicronema hongdechloris cells adapted to far-red light

  • Franz-Josef Schmitt
  • Züleyha Yenice Campbell
  • Mai Vi Bui
  • Anne Hüls
  • Tatsuya Tomo
  • Min Chen
  • Eugene G. Maksimov
  • Suleyman I. Allakhverdiev
  • Thomas Friedrich
Original article
  • 219 Downloads

Abstract

The phototrophic cyanobacterium Halomicronema hongdechloris shows far-red light-induced accumulation of chlorophyll (Chl) f, but the involvement of the pigment in photosynthetic energy harvesting by photosystem (PS) II is controversially discussed. While H. hongdechloris contains negligible amounts of Chl f in white-light culture conditions, the ratio of Chl f to Chl a is reversibly changed up to 1:8 under illumination with far-red light (720–730 nm). We performed UV–Vis absorption spectroscopy, time-integrated and time-resolved fluorescence spectroscopy for the calculation of decay-associated spectra (DAS) to determine excitation energy transfer (EET) processes between photosynthetic pigments in intact H. hongdechloris filaments. In cells grown under white light, highly efficient EET occurs from phycobilisomes (PBSs) to Chl a with an apparent time constant of about 100 ps. Charge separation occurs with a typical apparent time constant of 200–300 ps from Chl a. After 3–4 days of growth under far-red light, robust Chl f content was observed in H. hongdechloris and EET from PBSs reached Chl f efficiently within 200 ps. It is proposed based on mathematical modeling by rate equation systems for EET between the PBSs and PSII and subsequent electron transfer (ET) that charge separation occurs from Chl a and excitation energy is funneled from Chl f to Chl a via an energetically uphill EET driven by entropy, which is effective because the number of Chl a molecules coupled to Chl f is at least eight- to tenfold larger than the corresponding number of Chl f molecules. The long lifetime of Chl f molecules in contact to a tenfold larger pool of Chl a molecules allows Chl f to act as an intermediate energy storage level, from which the Gibbs free energy difference between Chl f and Chl a can be overcome by taking advantage from the favorable ratio of degeneracy coefficients, which formally represents a significant entropy gain in the Eyring formulation of the Arrhenius law. Direct evidence for energetically uphill EET and charge separation in PSII upon excitation of Chl f via anti-Stokes fluorescence in far-red light-adapted H. hongdechloris cells was obtained: Excitation by 720 nm laser light resulted in robust Chl a fluorescence at 680 nm that was distinctly temperature-dependent and, notably, increased upon DCMU (3-(3,4-dichlorophenyl)-1,1-dimethylurea) treatment in far-red light-adapted cells. Thus, rather than serving as an excitation energy trap, Chl f in far-red light-adapted H. hongdechloris cells is directly contributing to oxygenic photosynthesis at PSII.

Keywords

Halomicronema hongdechloris Chlorophyll f Light harvesting (Uphill) excitation energy transfer Entropy Decay-associated spectra 

Abbreviations

APC

Allophycocyanin

Chl a

Chlorophyll a

Chl-aII

Primary electron donor Chl of PSII (= P680)

Chl d

Chlorophyll d

Chl f

Chlorophyll f

DCMU

3-(3,4-Dichlorophenyl)-1,1-dimethylurea

EET

Excitation energy transfer

ET

Electron transfer

FRL

Far-red light (720–730 nm)

LHC

Light-harvesting complex

PBS

Phycobilisome

PBP

Phycobiliprotein

PC

Phycocyanin

Pheo

Pheophytin (primary electron acceptor of PSII)

PQ

Plastoquinone

PSI/II

Photosystem I/II

PsbA

PsbA protein complex (D1 subunit of PSII)

QA, QB

Primary and secondary plastoquinone molecules in PSII

RC

Reaction center

ROS

Reactive oxygen species

TCSPC

Time-correlated single-photon counting

WL

White light (from white fluorescence bulbs)

Notes

Acknowledgements

The authors thank Monika Weß and Sabine Kussin for technical assistance. Work was supported by the German Ministry of Education and Research (WTZ-RUS Grant 01DJ15007 to F.-J.S. and T.F.; and Hochschulpakt Lehre III/ TU-WIMIplus program to F.-J.S.), the German Research Foundation (Cluster of Excellence “Unifying Concepts in Catalysis”), and the Russian Foundation for Basic Research (Grant No. 18-04-00554 А to E.G.M.). S.I.A. was supported by a grant from the Russian Science Foundation (Grant No. 14-14-00039). M.C. acknowledges the research supports by the Australian Research Council Centre of Excellence for Translational Photosynthesis (CE140100015). This study was supported by Grants-in-Aids for Scientific Research from JSPS (Nos. 26220801, 17K07453, 18H05177 to T.T.) and a grant from JST PRESTO (T.T.).

Compliance with ethical standards

Conflict of interest

The authors declare that there are no conflicts of interest.

Supplementary material

11120_2018_556_MOESM1_ESM.docx (2.3 mb)
Supplementary material 1 (DOCX 2384 KB)

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Institute of Chemistry PC 14Technical University of BerlinBerlinGermany
  2. 2.Department of Biology, Faculty of ScienceTokyo University of ScienceTokyoJapan
  3. 3.School of Life and Environmental SciencesUniversity of SydneySydneyAustralia
  4. 4.Department of Biophysics, Faculty of BiologyLomonosov Moscow State UniversityMoscowRussian Federation
  5. 5.Faculty of BiologyM.V. Lomonosov Moscow State UniversityMoscowRussian Federation
  6. 6.Bionanotechnology Laboratory, Institute of Molecular Biology and BiotechnologyAzerbaijan National Academy of SciencesBakuAzerbaijan
  7. 7.Moscow Institute of Physics and TechnologyDolgoprudnyRussian Federation
  8. 8.Controlled Photobiosynthesis Laboratory, Institute of Plant PhysiologyRussian Academy of SciencesMoscowRussian Federation
  9. 9.Institute of Basic Biological ProblemsRussian Academy of SciencesPushchinoRussian Federation

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