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Structure of the far-red light utilizing photosystem I of Acaryochloris marina

Author

Listed:
  • Tasuku Hamaguchi

    (Biostructural Mechanism Laboratory, RIKEN SPring-8 Center)

  • Keisuke Kawakami

    (Osaka City University
    Biostructural Mechanism Laboratory, RIKEN SPring-8 Center)

  • Kyoko Shinzawa-Itoh

    (University of Hyogo)

  • Natsuko Inoue-Kashino

    (University of Hyogo)

  • Shigeru Itoh

    (Nagoya University)

  • Kentaro Ifuku

    (Kyoto University)

  • Eiki Yamashita

    (Osaka University)

  • Kou Maeda

    (University of Hyogo)

  • Koji Yonekura

    (Biostructural Mechanism Laboratory, RIKEN SPring-8 Center
    Tohoku University)

  • Yasuhiro Kashino

    (University of Hyogo)

Abstract

Acaryochloris marina is one of the cyanobacterial species that can use far-red light to drive photochemical reactions for oxygenic photosynthesis. Here, we report the structure of A. marina photosystem I (PSI) reaction center, determined by cryo-electron microscopy at 2.58 Å resolution. The structure reveals an arrangement of electron carriers and light-harvesting pigments distinct from other type I reaction centers. The paired chlorophyll, or special pair (also referred to as P740 in this case), is a dimer of chlorophyll d and its epimer chlorophyll d′. The primary electron acceptor is pheophytin a, a metal-less chlorin. We show the architecture of this PSI reaction center is composed of 11 subunits and we identify key components that help explain how the low energy yield from far-red light is efficiently utilized for driving oxygenic photosynthesis.

Suggested Citation

  • Tasuku Hamaguchi & Keisuke Kawakami & Kyoko Shinzawa-Itoh & Natsuko Inoue-Kashino & Shigeru Itoh & Kentaro Ifuku & Eiki Yamashita & Kou Maeda & Koji Yonekura & Yasuhiro Kashino, 2021. "Structure of the far-red light utilizing photosystem I of Acaryochloris marina," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22502-8
    DOI: 10.1038/s41467-021-22502-8
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