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Structure of a photosystem II-FCPII supercomplex from a haptophyte reveals a distinct antenna organization

Author

Listed:
  • Romain Rocca

    (Okayama University)

  • Koji Kato

    (Okayama University)

  • Pi-Cheng Tsai

    (Okayama University)

  • Yoshiki Nakajima

    (Okayama University)

  • Fusamichi Akita

    (Okayama University)

  • Jian-Ren Shen

    (Okayama University)

Abstract

Haptophytes are unicellular algae that produce 30 to 50% of biomass in oceans. Among haptophytes, a subset named coccolithophores is characterized by calcified scales. Despite the importance of coccolithophores in global carbon fixation and CaCO3 production, their energy conversion system is still poorly known. Here we report a cryo-electron microscopic structure of photosystem II (PSII)-fucoxanthin chlorophyll c-binding protein (FCPII) supercomplex from Chyrostila roscoffensis, a representative of coccolithophores. This complex has two sets of six dimeric and monomeric FCPIIs, with distinct orientations. Interfaces of both FCPII/FCPII and FCPII/core differ from previously reported. We also determine the sequence of Psb36, a subunit previously found in diatoms and red algae. The principal excitation energy transfer (EET) pathways involve mainly 5 FCPIIs, where one FCPII monomer mediates EET to CP47. Our findings provide a solid structural basis for EET and energy dissipation pathways occurring in coccolithophores.

Suggested Citation

  • Romain Rocca & Koji Kato & Pi-Cheng Tsai & Yoshiki Nakajima & Fusamichi Akita & Jian-Ren Shen, 2025. "Structure of a photosystem II-FCPII supercomplex from a haptophyte reveals a distinct antenna organization," Nature Communications, Nature, vol. 16(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59512-9
    DOI: 10.1038/s41467-025-59512-9
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    References listed on IDEAS

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    1. Yu-Zhong Zhang & Kang Li & Bing-Yue Qin & Jian-Ping Guo & Quan-Bao Zhang & Dian-Li Zhao & Xiu-Lan Chen & Jun Gao & Lu-Ning Liu & Long-Sheng Zhao, 2024. "Structure of cryptophyte photosystem II–light-harvesting antennae supercomplex," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    2. Zhiyuan Mao & Xingyue Li & Zhenhua Li & Liangliang Shen & Xiaoyi Li & Yanyan Yang & Wenda Wang & Tingyun Kuang & Jian-Ren Shen & Guangye Han, 2024. "Structure and distinct supramolecular organization of a PSII-ACPII dimer from a cryptophyte alga Chroomonas placoidea," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    3. Songhao Zhao & Lili Shen & Xiaoyi Li & Qiushuang Tao & Zhenhua Li & Caizhe Xu & Cuicui Zhou & Yanyan Yang & Min Sang & Guangye Han & Long-Jiang Yu & Tingyun Kuang & Jian-Ren Shen & Wenda Wang, 2023. "Structural insights into photosystem II supercomplex and trimeric FCP antennae of a centric diatom Cyclotella meneghiniana," Nature Communications, Nature, vol. 14(1), pages 1-15, December.
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    1. Yu-Zhong Zhang & Kang Li & Bing-Yue Qin & Jian-Ping Guo & Quan-Bao Zhang & Dian-Li Zhao & Xiu-Lan Chen & Jun Gao & Lu-Ning Liu & Long-Sheng Zhao, 2024. "Structure of cryptophyte photosystem II–light-harvesting antennae supercomplex," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
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