+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-9670 | |||||||||
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Title | Structure of PSI-LHCI | |||||||||
Map data | PSI-LHCI | |||||||||
Sample |
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Function / homology | Function and homology information thylakoid membrane / photosynthesis, light harvesting / chloroplast thylakoid lumen / photosynthesis, light harvesting in photosystem I / photosystem I reaction center / photosystem I / photosynthetic electron transport in photosystem I / photosystem I / photosystem II / chloroplast thylakoid membrane ...thylakoid membrane / photosynthesis, light harvesting / chloroplast thylakoid lumen / photosynthesis, light harvesting in photosystem I / photosystem I reaction center / photosystem I / photosynthetic electron transport in photosystem I / photosystem I / photosystem II / chloroplast thylakoid membrane / chlorophyll binding / response to light stimulus / photosynthesis / chloroplast / 4 iron, 4 sulfur cluster binding / electron transfer activity / oxidoreductase activity / metal ion binding Similarity search - Function | |||||||||
Biological species | Bryopsis corticulans (plant) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.49 Å | |||||||||
Authors | Xiong P / Xiaochun Q | |||||||||
Citation | Journal: Nat Plants / Year: 2019 Title: Structure of a green algal photosystem I in complex with a large number of light-harvesting complex I subunits. Authors: Xiaochun Qin / Xiong Pi / Wenda Wang / Guangye Han / Lixia Zhu / Mingmei Liu / Linpeng Cheng / Jian-Ren Shen / Tingyun Kuang / Sen-Fang Sui / Abstract: Photosystem I (PSI) is a highly efficient natural light-energy converter, and has diverse light-harvesting antennas associated with its core in different photosynthetic organisms. In green algae, an ...Photosystem I (PSI) is a highly efficient natural light-energy converter, and has diverse light-harvesting antennas associated with its core in different photosynthetic organisms. In green algae, an extremely large light-harvesting complex I (LHCI) captures and transfers energy to the PSI core. Here, we report the structure of PSI-LHCI from a green alga Bryopsis corticulans at 3.49 Å resolution, obtained by single-particle cryo-electron microscopy, which revealed 13 core subunits including subunits characteristic of both prokaryotes and eukaryotes, and 10 light-harvesting complex a (Lhca) antennas that form a double semi-ring and an additional Lhca dimer, including a novel four-transmembrane-helix Lhca. In total, 244 chlorophylls were identified, some of which were located at key positions for the fast energy transfer. These results provide a firm structural basis for unravelling the mechanisms of light-energy harvesting, transfer and quenching in the green algal PSI-LHCI, and important clues as to how PSI-LHCI has changed during evolution. | |||||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | EM map: SurfViewMolmilJmol/JSmol |
Supplemental images |
-Downloads & links
-EMDB archive
Map data | emd_9670.map.gz | 337.3 MB | EMDB map data format | |
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Header (meta data) | emd-9670-v30.xml emd-9670.xml | 31.4 KB 31.4 KB | Display Display | EMDB header |
Images | emd_9670.png | 118.4 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-9670 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-9670 | HTTPS FTP |
-Validation report
Summary document | emd_9670_validation.pdf.gz | 559.6 KB | Display | EMDB validaton report |
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Full document | emd_9670_full_validation.pdf.gz | 559.2 KB | Display | |
Data in XML | emd_9670_validation.xml.gz | 7 KB | Display | |
Data in CIF | emd_9670_validation.cif.gz | 8 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-9670 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-9670 | HTTPS FTP |
-Related structure data
Related structure data | 6igzMC M: atomic model generated by this map C: citing same article (ref.) |
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Similar structure data |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_9670.map.gz / Format: CCP4 / Size: 371.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | PSI-LHCI | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.8727 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Sample components
+Entire : PSI-LHCI
+Supramolecule #1: PSI-LHCI
+Macromolecule #1: PsaA
+Macromolecule #2: PsaB
+Macromolecule #3: PsaC
+Macromolecule #4: PsaD
+Macromolecule #5: PsaE
+Macromolecule #6: PsaF
+Macromolecule #7: PsaG
+Macromolecule #8: PsaH
+Macromolecule #9: PsaI
+Macromolecule #10: PsaJ
+Macromolecule #11: PsaK
+Macromolecule #12: PsaL
+Macromolecule #13: Lhca-a
+Macromolecule #14: Lhca-c
+Macromolecule #15: Lhca-d
+Macromolecule #16: Lhca-b
+Macromolecule #17: Lhca-g
+Macromolecule #18: Lhca-h
+Macromolecule #19: Lhca-i
+Macromolecule #20: Lhca-j
+Macromolecule #21: Photosystem I reaction center subunit XII
+Macromolecule #22: CHLOROPHYLL A
+Macromolecule #23: PHYLLOQUINONE
+Macromolecule #24: 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
+Macromolecule #25: (6'R,11cis,11'cis,13cis,15cis)-4',5'-didehydro-5',6'-dihydro-beta...
+Macromolecule #26: HEPTYL 1-THIOHEXOPYRANOSIDE
+Macromolecule #27: IRON/SULFUR CLUSTER
+Macromolecule #28: DIGALACTOSYL DIACYL GLYCEROL (DGDG)
+Macromolecule #29: CHLOROPHYLL B
+Macromolecule #30: (3S,5R,6S,3'S,5'R,6'S)-5,6,5',6'-DIEPOXY-5,6,5',6'- TETRAHYDRO-BE...
+Macromolecule #31: 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Concentration | 3 mg/mL |
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Buffer | pH: 7.8 |
Vitrification | Cryogen name: ETHANE |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: FEI FALCON II (4k x 4k) / Average electron dose: 1.852 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.49 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 59525 |
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Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |