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

Content Provider	Royal Society of Chemistry (RSC)
Author	Kreisbeck, Christoph Aspuru-Guzik, Alán
Copyright Year	2016
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 transfer chain. Our findings suggest that the structure of the PS-II supercomplex guarantees photoprotection rather than optimized efficiency.
Starting Page	4174
Ending Page	4183
Page Count	10
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	7
Issue Number	7
Journal	Chemical Science
DOI	10.1039/c5sc04296h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Photosynthetic reaction centre Exciton Photosystem II Photoprotection
Content Type	Text
Resource Type	Article
Subject	Chemistry

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

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