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A Supercomplex of Cytochrome bf and Photosystem I for Cyclic Electron Flow

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Cytochrome Complexes: Evolution, Structures, Energy Transduction, and Signaling

Part of the book series: Advances in Photosynthesis and Respiration ((AIPH,volume 41))

Summary

In oxygen-evolving photosynthesis, photochemical energy conversion occurs via electron transport in the thylakoid membranes, resulting in the reduction of NADP+ in the stroma and the concomitant pumping of protons into the thylakoid lumen. Those electrons flow into two different pathways in the thylakoid membranes: the linear electron flow pathway from water to NADP+ via photosystem II and photosystem I (PSI) in series and the cyclic electron flow pathway around PSI. While the operational site(s) for the cyclic electron flow has been elusive, recent studies are unraveling its molecular details. After providing an overview of the general understanding of the cyclic electron flow, this review focuses on a recent report on the super-supercomplex that is composed of the cytochrome b 6 f complex, photosystem I with its own light-harvesting complex, the light-harvesting complex for photosystem II, and the ferredoxin-NADPH oxidoreductase, which exhibits cyclic electron flow in the green unicellular alga Chlamydomonas reinhardtii.

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Abbreviations

AA:

Antimycin A

CEF:

Cyclic electron flow

Cyt bf :

cytochrome b 6 f complex

DBMIB:

2,5-dibromo-3-methyl-6-isopropylbenzoquinone

DCMU:

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

DMBQ:

2,6-dimethyl-p-benzoquinone

FCCP:

Carbonyl cyanide 4-(trifluoromethoxy)phenylhydrazone

Fd:

Ferredoxin

FNR:

Ferredoxin-NADPH oxidoreductase

FQR:

Ferredoxin-plastoquinone oxidoreductase

LEF:

Linear electron flow

LHCI and LHCII:

Light-harvesting complex protein I and II

NDH:

NAD(P)H dehydrogenase

NPQ:

Non-photochemical quenching

Pc:

Plastocyanin

PQ:

Plastoquinone

PSI and PSII:

Photosystem I and II

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Acknowledgments

The work done in my laboratory was supported in part by the New Energy and Industrial Technology Development Organization, the Japan Science and Technology Agency, the Japan Society for the Promotion of Science, and the Ministry of Education, Culture, Sports, Science and Technology.

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Authors and Affiliations

  1. Division of Environmental Photobiology, National Institute for Basic Biology (NIBB), Okazaki, 444–8585, Japan

    Jun Minagawa

  2. Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Saitama, 332–0012, Japan

    Jun Minagawa

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  1. Jun Minagawa
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Correspondence to Jun Minagawa .

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Editors and Affiliations

  1. Department of Biological Sciences, Purdue University, West Lafayette, Indiana, USA

    William A. Cramer

  2. Department of Biology, University of Wisconsin-Oshkosh, Oshkosh, Wisconsin, USA

    Toivo Kallas

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Minagawa, J. (2016). A Supercomplex of Cytochrome bf and Photosystem I for Cyclic Electron Flow. In: Cramer, W., Kallas, T. (eds) Cytochrome Complexes: Evolution, Structures, Energy Transduction, and Signaling. Advances in Photosynthesis and Respiration, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-7481-9_23

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