6J3Y

Structure of C2S2-type PSII-FCPII supercomplex from diatom

これはPDB形式変換不可エントリーです。

6J3Y の概要

• エントリーDOI: 10.2210/pdb6j3y/pdb
• EMDBエントリー: 9775
• 分子名称: Photosystem II reaction center protein D1, Photosystem II reaction center protein K, Photosystem II reaction center protein L, ... (39 entities in total)
• 機能のキーワード: photosystem, electron transport
• 由来する生物種: Chaetoceros gracilis; 詳細
• タンパク質・核酸の鎖数: 56
• 化学式量合計: 1082716.25

構造登録者

Nagao, R.,Kato, K.,Shen, J.R.,Miyazaki, N.,Akita, F. (登録日: 2019-01-07, 公開日: 2019-08-07, 最終更新日: 2025-09-17)

主引用文献

Nagao, R.,Kato, K.,Suzuki, T.,Ifuku, K.,Uchiyama, I.,Kashino, Y.,Dohmae, N.,Akimoto, S.,Shen, J.R.,Miyazaki, N.,Akita, F.
Structural basis for energy harvesting and dissipation in a diatom PSII-FCPII supercomplex.
Nat.Plants, 5:890-901, 2019

PubMed Abstract: Light-harvesting antenna systems in photosynthetic organisms harvest solar energy and transfer it to the photosynthetic reaction centres to initiate charge-separation and electron-transfer reactions. Diatoms are one of the important groups of oxyphototrophs and possess fucoxanthin chlorophyll a/c-binding proteins (FCPs) as light harvesters. The organization and association pattern of FCP with the photosystem II (PSII) core are unknown. Here we solved the structure of PSII-FCPII supercomplexes isolated from a diatom, Chaetoceros gracilis, by single-particle cryoelectron microscopy. The PSII-FCPII forms a homodimer. In each monomer, two FCP homotetramers and three FCP monomers are associated with one PSII core. The structure reveals a highly complicated protein-pigment network that is different from the green-type light-harvesting apparatus. Comparing these two systems allows the identification of energy transfer and quenching pathways. These findings provide structural insights into not only excitation-energy transfer mechanisms in the diatom PSII-FCPII, but also changes of light harvesters between the red- and green-lineage oxyphototrophs during evolution.

PubMed: 31358960
DOI: 10.1038/s41477-019-0477-x

実験手法

ELECTRON MICROSCOPY (3.3 Å)