6IGZ

Structure of PSI-LHCI

6IGZ の概要

• エントリーDOI: 10.2210/pdb6igz/pdb
• EMDBエントリー: 9670
• 分子名称: PsaA, PsaJ, PsaK, ... (31 entities in total)
• 機能のキーワード: psi-lhci, plant protein
• 由来する生物種: Bryopsis corticulans; 詳細
• タンパク質・核酸の鎖数: 23
• 化学式量合計: 841703.80

構造登録者

Xiong, P.,Xiaochun, Q. (登録日: 2018-09-27, 公開日: 2019-02-13, 最終更新日: 2025-06-25)

主引用文献

Qin, X.,Pi, X.,Wang, W.,Han, G.,Zhu, L.,Liu, M.,Cheng, L.,Shen, J.R.,Kuang, T.,Sui, S.F.
Structure of a green algal photosystem I in complex with a large number of light-harvesting complex I subunits.
Nat Plants, 5:263-272, 2019

PubMed Abstract: Photosystem I (PSI) is a highly efficient natural light-energy converter, and has diverse light-harvesting antennas associated with its core in different photosynthetic organisms. In green algae, an extremely large light-harvesting complex I (LHCI) captures and transfers energy to the PSI core. Here, we report the structure of PSI-LHCI from a green alga Bryopsis corticulans at 3.49 Å resolution, obtained by single-particle cryo-electron microscopy, which revealed 13 core subunits including subunits characteristic of both prokaryotes and eukaryotes, and 10 light-harvesting complex a (Lhca) antennas that form a double semi-ring and an additional Lhca dimer, including a novel four-transmembrane-helix Lhca. In total, 244 chlorophylls were identified, some of which were located at key positions for the fast energy transfer. These results provide a firm structural basis for unravelling the mechanisms of light-energy harvesting, transfer and quenching in the green algal PSI-LHCI, and important clues as to how PSI-LHCI has changed during evolution.

PubMed: 30850820
DOI: 10.1038/s41477-019-0379-y

実験手法

ELECTRON MICROSCOPY (3.49 Å)