9M4F

Photosystem I from the eukaryotic filamentous algae

これはPDB形式変換不可エントリーです。

9M4F の概要

• エントリーDOI: 10.2210/pdb9m4f/pdb
• EMDBエントリー: 63625
• 分子名称: Light-harvesting protein XLH1, light-harvesting protein XLH11, light-harvesting protein XLH12, ... (32 entities in total)
• 機能のキーワード: photosystem i, xanthophyceae, tribonema minus, photosynthesis
• 由来する生物種: Tribonema minus; 詳細
• タンパク質・核酸の鎖数: 25
• 化学式量合計: 825593.60

構造登録者

Shao, R.Q.,Pan, X.W. (登録日: 2025-03-04, 公開日: 2025-08-27, 最終更新日: 2025-11-19)

主引用文献

Shao, R.,Zou, Y.,Shang, H.,Qiu, Y.,Liang, Z.,Su, X.,Zhang, S.,Li, M.,Pan, X.
Architecture of photosystem I-light-harvesting complex from the eukaryotic filamentous yellow-green alga Tribonema minus.
J Integr Plant Biol, 67:3014-3031, 2025

PubMed Abstract: Eukaryotic photosystem I (PSI) is a multi-subunit pigment-protein supercomplex that consists of a core complex and multiple peripheral light-harvesting complexes I (LHCIs), which increases the light absorption capacity of the core complex. Throughout the evolution of oxygenic photoautotrophs, the core subunits of PSI have remained highly conserved, while LHCIs exhibit significant variability, presumably to adapt to diverse environments. This study presents a 2.82 Å resolution structure of PSI from the filamentous yellow-green alga Tribonema minus (Tm), a member of the class Xanthophyceae that evolved from red algae through endosymbiosis and is considered a promising candidate for biofuel production due to its high biomass and lipid content. Our structure reveals a supramolecular organization consisting of 12 core subunits and 13 LHCIs, here referred to as Xanthophyceae light-harvesting complexes (XLHs), along with the arrangement of pigments within the TmPSI-XLH supercomplex. A structural comparison between TmPSI-XLH and PSI-LHCI from various red lineages highlights distinctive features of TmPSI-XLH, suggesting that it represents a unique intermediate state in the PSI assembly process during the evolutionary transition from red algae to diatoms. Our findings advance the understanding of the molecular mechanisms responsible for energy transfer in Xanthophyceae PSI-XLH and the evolutionary adaptation of red lineages.

PubMed: 40778523
DOI: 10.1111/jipb.70010

実験手法

ELECTRON MICROSCOPY (2.82 Å)