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A megacomplex composed of both photosystem reaction centres in higher plants

Author

Listed:
  • M. Yokono

    (Institute of Low Temperature Science, Hokkaido University
    CREST, JST)

  • A. Takabayashi

    (Institute of Low Temperature Science, Hokkaido University
    CREST, JST)

  • S. Akimoto

    (Molecular Photoscience Research Center, Kobe University
    CREST, JST)

  • A. Tanaka

    (Institute of Low Temperature Science, Hokkaido University
    CREST, JST)

Abstract

Throughout the history of oxygen evolution, two types of photosystem reaction centres (PSI and PSII) have worked in a coordinated manner. The oxygen evolving centre is an integral part of PSII, and extracts an electron from water. PSI accepts the electron, and accumulates reducing power. Traditionally, PSI and PSII are thought to be spatially dispersed. Here, we show that about half of PSIIs are physically connected to PSIs in Arabidopsis thaliana. In the PSI–PSII complex, excitation energy is transferred efficiently between the two closely interacting reaction centres. PSII diverts excitation energy to PSI when PSII becomes closed-state in the PSI–PSII complex. The formation of PSI–PSII complexes is regulated by light conditions. Quenching of excess energy by PSI might be one of the physiological functions of PSI–PSII complexes.

Suggested Citation

  • M. Yokono & A. Takabayashi & S. Akimoto & A. Tanaka, 2015. "A megacomplex composed of both photosystem reaction centres in higher plants," Nature Communications, Nature, vol. 6(1), pages 1-6, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7675
    DOI: 10.1038/ncomms7675
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