Structural insights into a dimeric Psb27-photosystem II complex from a cyanobacterium <i>Thermosynechococcus vulcanus</i>

  • Guoqiang Huang
    State Key Laboratory of Membrane Biology, Beijing Advanced Innovation Center for Structural Biology and Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, 100084 Beijing, China;
  • Yanan Xiao
    Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, The Chinese Academy of Sciences, 100093 Beijing, China;
  • Xiong Pi
    State Key Laboratory of Membrane Biology, Beijing Advanced Innovation Center for Structural Biology and Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, 100084 Beijing, China;
  • Liang Zhao
    State Key Laboratory of Membrane Biology, Beijing Advanced Innovation Center for Structural Biology and Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, 100084 Beijing, China;
  • Qingjun Zhu
    Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, The Chinese Academy of Sciences, 100093 Beijing, China;
  • Wenda Wang
    Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, The Chinese Academy of Sciences, 100093 Beijing, China;
  • Tingyun Kuang
    Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, The Chinese Academy of Sciences, 100093 Beijing, China;
  • Guangye Han
    Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, The Chinese Academy of Sciences, 100093 Beijing, China;
  • Sen-Fang Sui
    State Key Laboratory of Membrane Biology, Beijing Advanced Innovation Center for Structural Biology and Frontier Research Center for Biological Structure, School of Life Sciences, Tsinghua University, 100084 Beijing, China;
  • Jian-Ren Shen
    Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, The Chinese Academy of Sciences, 100093 Beijing, China;

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<jats:title>Significance</jats:title> <jats:p> Photosystem II (PSII) is a light-driven water:plastoquinone oxidoreductase in oxygenic photosynthetic organisms. Several inactive PSII intermediates are involved in the biogenesis of the multisubunit PSII complexes as well as in their repair after unavoidable oxidative damage targeted to PSII under light. Psb27 is one of the assembly factors associated with inactive PSII intermediate and plays important roles in the biogenesis/repair of PSII. Here, we report the structure of a dimeric Psb27-PSII from a thermophilic cyanobacterium <jats:italic>Thermosynechococcus vulcanus</jats:italic> by cryo-electron microscopy. Our results reveal the location and binding properties of Psb27 in the intermediate PSII and show the structural differences between the intermediate and native PSII. These results provide important clues for the roles of Psb27 in the biogenesis/repair of PSII. </jats:p>

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