8XR6

Cryo-EM structure of cryptophyte photosystem II

8XR6 の概要

• エントリーDOI: 10.2210/pdb8xr6/pdb
• EMDBエントリー: 38596
• 分子名称: Photosystem II protein D1, Photosystem II D2 protein, Cytochrome b559 subunit alpha, ... (45 entities in total)
• 機能のキーワード: cryptophyte, photosystem ii, evolution, photosynthesis
• 由来する生物種: Chroomonas placoidea; 詳細
• タンパク質・核酸の鎖数: 56
• 化学式量合計: 1325072.89

構造登録者

Li, K.,Zhao, L.S.,Zhang, Y.Z.,Liu, L.N. (登録日: 2024-01-06, 公開日: 2024-06-19, 最終更新日: 2025-01-01)

主引用文献

Zhang, Y.Z.,Li, K.,Qin, B.Y.,Guo, J.P.,Zhang, Q.B.,Zhao, D.L.,Chen, X.L.,Gao, J.,Liu, L.N.,Zhao, L.S.
Structure of cryptophyte photosystem II-light-harvesting antennae supercomplex.
Nat Commun, 15:4999-4999, 2024

PubMed 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.

PubMed: 38866834
DOI: 10.1038/s41467-024-49453-0

実験手法

ELECTRON MICROSCOPY (2.53 Å)