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-Structure paper
| タイトル | Architecture of photosystem I-light-harvesting complex from the eukaryotic filamentous yellow-green alga Tribonema minus. |
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| ジャーナル・号・ページ | J Integr Plant Biol, Vol. 67, Issue 11, Page 3014-3031, Year 2025 |
| 掲載日 | 2025年8月8日 |
著者 | Ruiqi Shao / Yuqi Zou / Hui Shang / Yue Qiu / Zuxing Liang / Xiaodong Su / Shumeng Zhang / Mei Li / Xiaowei Pan / ![]() |
| PubMed 要旨 | 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 ...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. |
リンク | J Integr Plant Biol / PubMed:40778523 |
| 手法 | EM (単粒子) |
| 解像度 | 2.69 - 4.17 Å |
| 構造データ | EMDB-63625, PDB-9m4f: ![]() EMDB-63818: Focused refinement map of light harvesting complexes XLH2/3/4/5/6/7/12/13 in the PSI of Tribonema minus ![]() EMDB-63819: Focus refinement map of the light harvesting complexes XLH1/8/9/10/11 in the PSI of Tribonema minus. ![]() EMDB-63820: Focused refinement map of the core complex in the photosystem I of Tribonema minus. ![]() EMDB-63821: Raw consensus map of PSI-LHCI supercomplex from Tribonema minus ![]() EMDB-63822: Consensus map reconstructed from particles with optimal densities in the PsaS region. |
| 化合物 | ![]() ChemComp-CLA: ![]() ChemComp-BCR: ![]() ChemComp-DD6: ![]() ChemComp-LMT: ![]() ChemComp-LHG: ![]() PDB-1l1g: ![]() ChemComp-LMG: ![]() ChemComp-PQN: ![]() ChemComp-SF4: |
| 由来 |
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キーワード | PHOTOSYNTHESIS / Photosystem I / Xanthophyceae / Tribonema minus |
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tribonema minus (真核生物)
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