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-Structure paper
タイトル | Structural basis and evolution of the photosystem I-light-harvesting supercomplex of cryptophyte algae. |
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ジャーナル・号・ページ | Plant Cell, Vol. 35, Issue 7, Page 2449-2463, Year 2023 |
掲載日 | 2023年6月26日 |
著者 | Long-Sheng Zhao / Peng Wang / Kang Li / Quan-Bao Zhang / Fei-Yu He / Chun-Yang Li / Hai-Nan Su / Xiu-Lan Chen / Lu-Ning Liu / Yu-Zhong Zhang / |
PubMed 要旨 | Cryptophyte plastids originated from a red algal ancestor through secondary endosymbiosis. Cryptophyte photosystem I (PSI) associates with transmembrane alloxanthin-chlorophyll a/c proteins (ACPIs) ...Cryptophyte plastids originated from a red algal ancestor through secondary endosymbiosis. Cryptophyte photosystem I (PSI) associates with transmembrane alloxanthin-chlorophyll a/c proteins (ACPIs) as light-harvesting complexes (LHCs). Here, we report the structure of the photosynthetic PSI-ACPI supercomplex from the cryptophyte Chroomonas placoidea at 2.7-Å resolution obtained by crygenic electron microscopy. Cryptophyte PSI-ACPI represents a unique PSI-LHCI intermediate in the evolution from red algal to diatom PSI-LHCI. The PSI-ACPI supercomplex is composed of a monomeric PSI core containing 14 subunits, 12 of which originated in red algae, 1 diatom PsaR homolog, and an additional peptide. The PSI core is surrounded by 14 ACPI subunits that form 2 antenna layers: an inner layer with 11 ACPIs surrounding the PSI core and an outer layer containing 3 ACPIs. A pigment-binding subunit that is not present in any other previously characterized PSI-LHCI complexes, ACPI-S, mediates the association and energy transfer between the outer and inner ACPIs. The extensive pigment network of PSI-ACPI ensures efficient light harvesting, energy transfer, and dissipation. Overall, the PSI-LHCI structure identified in this study provides a framework for delineating the mechanisms of energy transfer in cryptophyte PSI-LHCI and for understanding the evolution of photosynthesis in the red lineage, which occurred via secondary endosymbiosis. |
リンク | Plant Cell / PubMed:36943796 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.66 - 2.71 Å |
構造データ | EMDB-33659, PDB-7y7b: EMDB-33683, PDB-7y8a: |
化合物 | ChemComp-CLA: ChemComp-KC2: ChemComp-II0: ChemComp-II3: ChemComp-IHT: ChemComp-LMG: ChemComp-LHG: ChemComp-SQD: ChemComp-8CT: ChemComp-LMU: ChemComp-PQN: ChemComp-SF4: ChemComp-DGD: |
由来 |
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キーワード | PHOTOSYNTHESIS / Cryptophyte / Photosystem I / evolution |