Efficiency of energy funneling in the photosystem II supercomplex of higher plants

Chemical Science
Christoph Kreisbeck, Alán Aspuru-Guzik

Abstract

The investigation of energy transfer properties in photosynthetic multi-protein networks gives insight into their underlying design principles. Here, we discuss the excitonic energy transfer mechanisms of the photosystem II (PS-II) C2S2M2 supercomplex, which is the largest isolated functional unit of the photosynthetic apparatus of higher plants. Despite the lack of a definite energy gradient in C2S2M2, we show that the energy transfer is directed by relaxation to low energy states. C2S2M2 is not organized to form pathways with strict energetically downhill transfer, which has direct consequences for the transfer efficiency, transfer pathways and transfer limiting steps. The exciton dynamics is sensitive to small changes in the energetic layout which, for instance, are induced by the reorganization of vibrational coordinates. In order to incorporate the reorganization process in our numerical simulations, we go beyond rate equations and use the hierarchically coupled equation of motion approach (HEOM). While transfer from the peripheral antenna to the proteins in proximity to the reaction center occurs on a faster time scale, the final step of the energy transfer to the RC core is rather slow, and thus the limiting step in the ...Continue Reading

References

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Citations

Mar 28, 2017·Scientific Reports·Tobias Kramer, Mirta Rodriguez
Apr 6, 2018·Chemical Science·Florian HäseAlán Aspuru-Guzik
Mar 29, 2018·Proceedings of the National Academy of Sciences of the United States of America·Samuel M BlauAlán Aspuru-Guzik
Jun 13, 2017·Nature Plants·Laura S van BezouwenEgbert J Boekema
Aug 21, 2020·Science·Roberta Croce, Herbert van Amerongen
Mar 11, 2021·Physical Chemistry Chemical Physics : PCCP·Yigal LahavIgor Schapiro
Apr 21, 2021·Physical Chemistry Chemical Physics : PCCP·Sayan MaityUlrich Kleinekathöfer
Jan 4, 2017·The Journal of Physical Chemistry Letters·Larry LüerGiulio Cerullo
Oct 16, 2020·The Journal of Physical Chemistry. a·Ryan J DiRisioBenjamin J G Rousseau
Dec 22, 2016·The Journal of Physical Chemistry. B·Tobias KramerYaroslav Zelinskyy

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Methods Mentioned

BETA
circular dichroism

Software Mentioned

QMaster
GPU
HEOM

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