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The Cytochrome b 6 f Complex–Composition, Structure and Function

  • Chapter
Oxygenic Photosynthesis: The Light Reactions

Part of the book series: Advances in Photosynthesis and Respiration ((AIPH,volume 4))

Summary

The cytochrome b 6 f complex universally functions in oxygenic photosynthesis as plastoquinol-plastocyanin oxidoreductase or as plastoquinol-cytochrome c oxidoreductase between the two light reactions of Photosystem II and Photosystem I. It is structurally and functionally related to the cytochrome bc 1 complex of respiratory organisms and comprises 4 redox centers–1 heme c, 2 hemes b and the Rieske 2Fe2S-center. These operate quinol oxidation in a concerted mechanism, called the Q-cycle, which translocates twice the protons that would be translocated by plastoquinone/quinol action alone. It is still under debate whether this efficient energy conservation is operative under all conditions. The redox centers are bound by the 3 proteins, cytochrome f (heme c), cytochrome b 6 (2 hemes b) and the Rieske FeS-protein, whose genes have been sequenced for numerous plants and cyanobacteria. A fourth protein (subunit IV) is universally present and corresponds to the C-terminal part of cytochrome b of the bc 1 complexes. While a high resolution 3D-structure is now available for cytochrome f (see Chapter 22), the 3D-strucrures of the Rieske FeS-protein and of cytochrome b 6 plus subunit IV still depend on predictions from the sequences. The predicted folding for cytochrome b 6 with its transmembrane arrangement of the 2 hemes is in reassuring consistency with the Q-cycle. In addition to its role as energy converter the cytochrome b 6 f complex functions as a redox sensor of the plastoquinone pool in regulating the light distribution between the two photosystems.

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Authors and Affiliations

  1. Fakultät für Biologie und Vorklinische, Medizin, Lehrstuhl für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, D-93053, Regensburg, Germany

    Günter Hauska, Michael Schütz & Michael Büttner

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  1. Günter Hauska
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  2. Michael Schütz
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  3. Michael Büttner
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Editors and Affiliations

  1. USDA/ARS, Photosynthesis Research Unit, University of Illinois, Urbana, Illinois, USA

    Donald R. Ort

  2. Department of Biology/Chemistry, University of Michigan, Ann Arbor, Michigan, USA

    Charles F. Yocum

  3. University of Illinois, USA

    Iris F. Heichel (Assistant Editor) (Assistant Editor)

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© 1996 Kluwer Academic Publishers

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Hauska, G., Schütz, M., Büttner, M. (1996). The Cytochrome b 6 f Complex–Composition, Structure and Function. In: Ort, D.R., Yocum, C.F., Heichel, I.F. (eds) Oxygenic Photosynthesis: The Light Reactions. Advances in Photosynthesis and Respiration, vol 4. Springer, Dordrecht. https://doi.org/10.1007/0-306-48127-8_19

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  • DOI: https://doi.org/10.1007/0-306-48127-8_19

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-0-7923-3683-9

  • Online ISBN: 978-0-306-48127-7

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