Structure of cryptophyte photosystem II–light-harvesting antennae supercomplex

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 () and Long-Sheng Zhao ()
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Yu-Zhong Zhang: Shandong University
Kang Li: Ocean University of China
Bing-Yue Qin: Shandong University
Jian-Ping Guo: Huazhong Agricultural University
Quan-Bao Zhang: Shandong University
Dian-Li Zhao: Qingdao Marine Science and Technology Center
Xiu-Lan Chen: Shandong University
Jun Gao: Huazhong Agricultural University
Lu-Ning Liu: Ocean University of China
Long-Sheng Zhao: Shandong University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Cryptophytes are ancestral photosynthetic organisms evolved from red algae through secondary endosymbiosis. They have developed alloxanthin-chlorophyll a/c2-binding proteins (ACPs) as light-harvesting complexes (LHCs). The distinctive properties of cryptophytes contribute to efficient oxygenic photosynthesis and underscore the evolutionary relationships of red-lineage plastids. Here we present the cryo-electron microscopy structure of the Photosystem II (PSII)–ACPII supercomplex from the cryptophyte Chroomonas placoidea. The structure includes a PSII dimer and twelve ACPII monomers forming four linear trimers. These trimers structurally resemble red algae LHCs and cryptophyte ACPI trimers that associate with Photosystem I (PSI), suggesting their close evolutionary links. We also determine a Chl a-binding subunit, Psb-γ, essential for stabilizing PSII–ACPII association. Furthermore, computational calculation provides insights into the excitation energy transfer pathways. Our study lays a solid structural foundation for understanding the light-energy capture and transfer in cryptophyte PSII–ACPII, evolutionary variations in PSII–LHCII, and the origin of red-lineage LHCIIs.

Date: 2024
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DOI: 10.1038/s41467-024-49453-0

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