9MGW

Dunaliella salina PSI-LHCI-TIDI1 supercomplex

9MGW の概要

• エントリーDOI: 10.2210/pdb9mgw/pdb
• EMDBエントリー: 48262
• 分子名称: Chlorophyll a-b binding protein, chloroplastic, PSAD1, PSAE1, ... (38 entities in total)
• 機能のキーワード: iron homeostasis, membrane protein, photosystem i, dunaliella, green alga, psi-lhci supercomplex, tidi, thylakoid iron-deficiency induced protein, photosynthetic apparatus, photosynthesis, eukaryotes
• 由来する生物種: Dunaliella salina; 詳細
• タンパク質・核酸の鎖数: 23
• 化学式量合計: 907249.41

構造登録者

Liu, H.W.,Khera, R.,Iwai, M.,Merchant, S.S. (登録日: 2024-12-11, 公開日: 2025-06-25)

主引用文献

Liu, H.W.,Khera, R.,Grob, P.,Gallaher, S.D.,Purvine, S.O.,Nicora, C.D.,Lipton, M.S.,Niyogi, K.K.,Nogales, E.,Iwai, M.,Merchant, S.S.
A distinct LHCI arrangement is recruited to photosystem I in Fe-starved green algae.
Proc.Natl.Acad.Sci.USA, 122:e2500621122-e2500621122, 2025

PubMed Abstract: Iron (Fe) availability limits photosynthesis at a global scale where Fe-rich photosystem (PS) I abundance is drastically reduced in Fe-poor environments. We used single-particle cryoelectron microscopy to reveal a unique Fe starvation-dependent arrangement of light-harvesting chlorophyll (LHC) proteins where Fe starvation-induced TIDI1 is found in an additional tetramer of LHC proteins associated with PSI in and . These cosmopolitan green algae are resilient to poor Fe nutrition. TIDI1 is a distinct LHC protein that co-occurs in diverse algae with flavodoxin (an Fe-independent replacement for the Fe-containing ferredoxin). The antenna expansion in eukaryotic algae we describe here is reminiscent of the iron-starvation induced (encoding) antenna ring in cyanobacteria, which typically co-occurs with , encoding flavodoxin. Our work showcases the convergent strategies that evolved after the Great Oxidation Event to maintain PSI capacity.

PubMed: 40523173
DOI: 10.1073/pnas.2500621122

実験手法

ELECTRON MICROSCOPY (3 Å)