6K61

Cryo-EM structure of the tetrameric photosystem I from a heterocyst-forming cyanobacterium Anabaena sp. PCC7120

6K61 の概要

• エントリーDOI: 10.2210/pdb6k61/pdb
• EMDBエントリー: 9918
• 分子名称: Photosystem I P700 chlorophyll a apoprotein A1, Photosystem I reaction center subunit VIII, Photosystem I reaction center subunit XI, ... (20 entities in total)
• 機能のキーワード: photosystem i, psi, pcc7120, photosynthesis
• 由来する生物種: Nostoc sp. PCC 7120; 詳細
• タンパク質・核酸の鎖数: 24
• 化学式量合計: 733164.02

構造登録者

Zheng, L.,Li, Y.,Li, X.,Zhong, Q.,Li, N.,Zhang, K.,Zhang, Y.,Chu, H.,Ma, C.,Li, G.,Zhao, J.,Gao, N. (登録日: 2019-05-31, 公開日: 2019-10-09, 最終更新日: 2024-03-27)

主引用文献

Zheng, L.,Li, Y.,Li, X.,Zhong, Q.,Li, N.,Zhang, K.,Zhang, Y.,Chu, H.,Ma, C.,Li, G.,Zhao, J.,Gao, N.
Structural and functional insights into the tetrameric photosystem I from heterocyst-forming cyanobacteria.
Nat.Plants, 5:1087-1097, 2019

PubMed Abstract: Two large protein-cofactor complexes, photosystem I and photosystem II, are the central components of photosynthesis in the thylakoid membranes. Here, we report the 2.37-Å structure of a tetrameric photosystem I complex from a heterocyst-forming cyanobacterium Anabaena sp. PCC 7120. Four photosystem I monomers, organized in a dimer of dimer, form two distinct interfaces that are largely mediated by specifically orientated polar lipids, such as sulfoquinovosyl diacylglycerol. The structure depicts a more closely connected network of chlorophylls across monomer interfaces than those seen in trimeric PSI from thermophilic cyanobacteria, possibly allowing a more efficient energy transfer between monomers. Our physiological data also revealed a functional link of photosystem I oligomerization to cyclic electron flow and thylakoid membrane organization.

PubMed: 31595062
DOI: 10.1038/s41477-019-0525-6

実験手法

ELECTRON MICROSCOPY (2.37 Å)