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Open data
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Basic information
| Entry | Database: PDB / ID: 9luu | ||||||||||||||||||||||||||||||
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| Title | PSI-4 LHCI dimer supercomplex from M. polymorpha | ||||||||||||||||||||||||||||||
Components |
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Keywords | PHOTOSYNTHESIS / Photosystem I | ||||||||||||||||||||||||||||||
| Function / homology | Function and homology informationphotosynthetic NADP+ reduction / photosystem I stabilization / chloroplast photosystem I / response to low light intensity stimulus / plastid thylakoid membrane / thylakoid membrane / response to high light intensity / photosynthesis, light harvesting in photosystem I / chloroplast thylakoid lumen / photosystem I reaction center ...photosynthetic NADP+ reduction / photosystem I stabilization / chloroplast photosystem I / response to low light intensity stimulus / plastid thylakoid membrane / thylakoid membrane / response to high light intensity / photosynthesis, light harvesting in photosystem I / chloroplast thylakoid lumen / photosystem I reaction center / photosystem I / photosynthetic electron transport in photosystem I / photosystem I / photosystem II / chlorophyll binding / chloroplast thylakoid membrane / response to light stimulus / photosynthesis / response to cold / chloroplast / 4 iron, 4 sulfur cluster binding / electron transfer activity / oxidoreductase activity / protein stabilization / protein domain specific binding / mRNA binding / magnesium ion binding / metal ion binding Similarity search - Function | ||||||||||||||||||||||||||||||
| Biological species | Marchantia polymorpha (common liverwort) | ||||||||||||||||||||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.52 Å | ||||||||||||||||||||||||||||||
Authors | Tsai, P.-C. / La Rocca, R. / Shen, J.-R. / Akita, F. | ||||||||||||||||||||||||||||||
| Funding support | Japan, 1items
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Citation | Journal: Commun Biol / Year: 2026Title: Structural study of monomeric and dimeric photosystem I-LHCI supercomplexes from a bryophyte. Authors: Pi-Cheng Tsai / Romain La Rocca / Hiroyasu Motose / Jian-Ren Shen / Fusamichi Akita / ![]() Abstract: Photosystem I (PSI) is one of the two photosystems conserved from cyanobacteria to vascular plants, and associates with multiple light-harvesting complexes (LHCs) that capture and transfer solar ...Photosystem I (PSI) is one of the two photosystems conserved from cyanobacteria to vascular plants, and associates with multiple light-harvesting complexes (LHCs) that capture and transfer solar energy. Liverworts such as Marchantia polymorpha occupy an early evolutionary position among land plants and faced major challenges during terrestrial adaptation, including desiccation, strong light, and UV radiation. We reveal the cryo-electron microscopic structures of PSI-LHCI monomer and homodimer from the liverwort M. polymorpha at resolutions of 1.94 and 2.52 Å, respectively. The high-resolution map allows identification of the cofactors of the monomer and reveal differences between the liverwort and moss, another clade of bryophytes. The PSI-LHCI monomer-monomer is stabilized by PsaG and PsaH interactions on the stromal side, which causes the bending and twisting of the homodimer. PsaM interacts with PsaB tightly, indicating a key role of PsaM in mediating the dimerization. | ||||||||||||||||||||||||||||||
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Structure visualization
| Structure viewer | Molecule: Molmil Jmol/JSmol |
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Downloads & links
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Download
| PDBx/mmCIF format | 9luu.cif.gz | 1.7 MB | Display | PDBx/mmCIF format |
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| PDB format | pdb9luu.ent.gz | Display | PDB format | |
| PDBx/mmJSON format | 9luu.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/lu/9luu ftp://data.pdbj.org/pub/pdb/validation_reports/lu/9luu | HTTPS FTP |
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-Related structure data
| Related structure data | ![]() 63405MC ![]() 9lutC M: map data used to model this data C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
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Assembly
| Deposited unit | ![]()
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Components
-Photosystem I ... , 11 types, 22 molecules BbCcDdEeFfGgHhIiJjMmAa
| #1: Protein | Mass: 82484.688 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: A0A3Q9R072, photosystem I#2: Protein | Mass: 8866.216 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: A0A3Q9R1I6, photosystem I#3: Protein | Mass: 22614.096 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: A0A2R6W6G7#4: Protein | Mass: 13821.722 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: A0A2R6WSQ6#5: Protein | Mass: 26025.164 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: A0A2R6WM91#6: Protein | Mass: 16912.248 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: A0A2R6X3Q4#7: Protein | Mass: 14660.665 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: A0A2R6XLB4#8: Protein/peptide | Mass: 4017.787 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: P12185#9: Protein/peptide | Mass: 4778.650 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: P12191#11: Protein/peptide | Mass: 3568.273 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: P31590#12: Protein | Mass: 83299.375 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: A0A3Q9R2J6, photosystem I |
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-Protein , 2 types, 4 molecules LlKk
| #10: Protein | Mass: 23152.729 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: A0A2R6WE99#17: Protein | Mass: 13483.683 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: A0A2R6W993 |
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-Chlorophyll a-b binding protein, ... , 4 types, 8 molecules 2a2b3a3b5a5b6a6b
| #13: Protein | Mass: 28576.648 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: I7JD56#14: Protein | Mass: 30133.443 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: I7KJM4#15: Protein | Mass: 27114.066 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: I7IIM0#16: Protein | Mass: 26038.801 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Marchantia polymorpha (common liverwort) / References: UniProt: I7JWJ2 |
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-Sugars , 2 types, 8 molecules 


| #21: Sugar | | #28: Sugar | ChemComp-LMU / |
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-Non-polymers , 10 types, 404 molecules 


















| #18: Chemical | ChemComp-CLA / #19: Chemical | ChemComp-PQN / #20: Chemical | ChemComp-BCR / #22: Chemical | ChemComp-LFA / #23: Chemical | ChemComp-LMG / #24: Chemical | ChemComp-SF4 / #25: Chemical | ChemComp-LUT / ( #26: Chemical | #27: Chemical | ChemComp-LHG / #29: Chemical | ChemComp-CHL / |
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-Details
| Has ligand of interest | Y |
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| Has protein modification | Y |
-Experimental details
-Experiment
| Experiment | Method: ELECTRON MICROSCOPY |
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| EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
| Component | Name: Photosystem I-4 LHCI dimer supercomplex from liverwort Type: COMPLEX / Entity ID: #1-#17 / Source: NATURAL |
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| Molecular weight | Experimental value: NO |
| Source (natural) | Organism: Marchantia polymorpha (common liverwort) |
| Buffer solution | pH: 7.5 |
| Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: 1.46 mg Chl a per mL |
| Specimen support | Details: 10 mA / Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3 |
| Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE |
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Electron microscopy imaging
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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| Microscopy | Model: TFS KRIOS |
| Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
| Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 600 nm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE |
| Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
| Image recording | Electron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 2 / Num. of real images: 17907 |
| EM imaging optics | Energyfilter name: TFS Selectris X / Phase plate: VOLTA PHASE PLATE |
| Image scans | Width: 4096 / Height: 4096 |
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Processing
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| CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||
| Particle selection | Num. of particles selected: 2164638 | ||||||||||||||||||||||||||||
| 3D reconstruction | Resolution: 2.52 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 27750 / Symmetry type: POINT | ||||||||||||||||||||||||||||
| Atomic model building | Protocol: FLEXIBLE FIT / Space: REAL |
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About Yorodumi




Marchantia polymorpha (common liverwort)
Japan, 1items
Citation



PDBj











FIELD EMISSION GUN