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Structural basis for the distinct core-antenna assembly of cryptophyte photosystem II

Author

Listed:
  • Long Si

    (CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Shumeng Zhang

    (CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences)

  • Xiaodong Su

    (CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Mei Li

    (CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences)

Abstract

Photosystem II (PSII) catalyzes the light-driven charge separation and water oxidation reactions of photosynthesis. Eukaryotic PSII core is usually associated with membrane-embedded light-harvesting antennae, which greatly increase the absorbance cross-section of the core. The peripheral antennae in different phototrophs vary considerably in protein composition and arrangement. Photosynthetic cryptophytes possess chlorophyll a/c binding proteins (CACs) that serve as their antennae. How these CACs assemble with the PSII core remains unclear. Here, we report the 2.57-Å resolution structure of cryptophyte PSII-CAC purified from cells at nitrogen-limited stationary growth phase. We show that each monomer of the PSII homodimer contains a core complex, six chlorophyll a/c binding proteins (CACs) and a previously unseen chlorophyll-binding protein (termed CAL-II). Six CACs are arranged as a double-layered arc-shaped non-parallel belt, and two such belts attach to the dimeric core from opposite sides. The CAL-II simultaneously interacts with a number of core subunits and five CACs. The distinct organization of CACs and the presence of CAL-II may play a critical role in stabilizing the dimeric PSII-CAC complex under stress conditions. Our study provides mechanistic insights into the assembly and function of the PSII-CAC complex as well as the possible adaptation of cryptophytes in response to environmental stresses.

Suggested Citation

  • Long Si & Shumeng Zhang & Xiaodong Su & Mei Li, 2024. "Structural basis for the distinct core-antenna assembly of cryptophyte photosystem II," Nature Communications, Nature, vol. 15(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51206-y
    DOI: 10.1038/s41467-024-51206-y
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    References listed on IDEAS

    as
    1. Matthew D. Johnson & David Oldach & Charles F. Delwiche & Diane K. Stoecker, 2007. "Retention of transcriptionally active cryptophyte nuclei by the ciliate Myrionecta rubra," Nature, Nature, vol. 445(7126), pages 426-428, January.
    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. Zhenfeng Liu & Hanchi Yan & Kebin Wang & Tingyun Kuang & Jiping Zhang & Lulu Gui & Xiaomin An & Wenrui Chang, 2004. "Crystal structure of spinach major light-harvesting complex at 2.72 Å resolution," Nature, Nature, vol. 428(6980), pages 287-292, March.
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