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- Title
Structure of cryptophyte photosystem II–light-harvesting antennae supercomplex.
- Authors
Zhang, Yu-Zhong; Li, Kang; Qin, Bing-Yue; Guo, Jian-Ping; Zhang, Quan-Bao; Zhao, Dian-Li; Chen, Xiu-Lan; Gao, Jun; Liu, Lu-Ning; Zhao, Long-Sheng
- 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. Cryptophytes are ancestral photosynthetic organisms. Here the authors report the cryo-EM structure of the PSII–ACPII from the cryptophyte Chroomonas placoidea, showing that cryptophyte PSII–ACPII consists of a PSII dimer and twelve ACPII monomers that are organised into four linear trimers.
- Subjects
PHOTOSYSTEMS; CRYPTOMONADS; ENERGY transfer; ENDOSYMBIOSIS; PLASTIDS
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-49453-0