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Yorodumi- EMDB-12672: Dimeric Photosystem I of a temperature sensitive mutant Chlamydom... -
+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-12672 | |||||||||
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Title | Dimeric Photosystem I of a temperature sensitive mutant Chlamydomonas reinhardtii | |||||||||
Map data | ||||||||||
Sample |
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Function / homology | Function and homology information chloroplast thylakoid lumen / photosynthesis, light harvesting / 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 ...chloroplast thylakoid lumen / photosynthesis, light harvesting / 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 / 4 iron, 4 sulfur cluster binding / electron transfer activity / oxidoreductase activity / magnesium ion binding / metal ion binding Similarity search - Function | |||||||||
Biological species | Chlamydomonas reinhardtii (plant) / Chlamydomonas smithii (plant) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 17.1 Å | |||||||||
Authors | Caspy I / Nelson N | |||||||||
Funding support | Israel, 2 items
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Citation | Journal: Commun Biol / Year: 2021 Title: Dimeric and high-resolution structures of Chlamydomonas Photosystem I from a temperature-sensitive Photosystem II mutant. Authors: Ido Caspy / Tom Schwartz / Vinzenz Bayro-Kaiser / Mariia Fadeeva / Amit Kessel / Nir Ben-Tal / Nathan Nelson / Abstract: Water molecules play a pivotal functional role in photosynthesis, primarily as the substrate for Photosystem II (PSII). However, their importance and contribution to Photosystem I (PSI) activity ...Water molecules play a pivotal functional role in photosynthesis, primarily as the substrate for Photosystem II (PSII). However, their importance and contribution to Photosystem I (PSI) activity remains obscure. Using a high-resolution cryogenic electron microscopy (cryo-EM) PSI structure from a Chlamydomonas reinhardtii temperature-sensitive photoautotrophic PSII mutant (TSP4), a conserved network of water molecules - dating back to cyanobacteria - was uncovered, mainly in the vicinity of the electron transport chain (ETC). The high-resolution structure illustrated that the water molecules served as a ligand in every chlorophyll that was missing a fifth magnesium coordination in the PSI core and in the light-harvesting complexes (LHC). The asymmetric distribution of the water molecules near the ETC branches modulated their electrostatic landscape, distinctly in the space between the quinones and FX. The data also disclosed the first observation of eukaryotic PSI oligomerisation through a low-resolution PSI dimer that was comprised of PSI-10LHC and PSI-8LHC. | |||||||||
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_12672.map.gz | 28.5 MB | EMDB map data format | |
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Header (meta data) | emd-12672-v30.xml emd-12672.xml | 29.9 KB 29.9 KB | Display Display | EMDB header |
FSC (resolution estimation) | emd_12672_fsc.xml | 7.3 KB | Display | FSC data file |
Images | emd_12672.png | 79.9 KB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-12672 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-12672 | HTTPS FTP |
-Validation report
Summary document | emd_12672_validation.pdf.gz | 441.3 KB | Display | EMDB validaton report |
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Full document | emd_12672_full_validation.pdf.gz | 440.9 KB | Display | |
Data in XML | emd_12672_validation.xml.gz | 9.7 KB | Display | |
Data in CIF | emd_12672_validation.cif.gz | 12.5 KB | Display | |
Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-12672 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-12672 | HTTPS FTP |
-Related structure data
Related structure data | 7o01MC 7bgiC 7blxC 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_12672.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 2.481 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 : Photosystem I of temperature sensitive Chlamydomonas reinhardtii
+Supramolecule #1: Photosystem I of temperature sensitive Chlamydomonas reinhardtii
+Macromolecule #1: Photosystem I P700 chlorophyll a apoprotein A1
+Macromolecule #2: Photosystem I P700 chlorophyll a apoprotein A2
+Macromolecule #3: Photosystem I iron-sulfur center
+Macromolecule #4: Photosystem I reaction center subunit II, chloroplastic
+Macromolecule #5: Photosystem I reaction center subunit IV, chloroplastic
+Macromolecule #6: Photosystem I reaction center subunit III, chloroplastic
+Macromolecule #7: Photosystem I reaction center subunit V, chloroplastic
+Macromolecule #8: Photosystem I reaction center subunit VIII
+Macromolecule #9: Photosystem I reaction center subunit IX
+Macromolecule #10: Photosystem I reaction center subunit psaK, chloroplastic
+Macromolecule #11: PSI subunit V
+Macromolecule #12: Chlorophyll a-b binding protein, chloroplastic
+Macromolecule #13: Chlorophyll a-b binding protein, chloroplastic
+Macromolecule #14: Chlorophyll a-b binding protein, chloroplastic
+Macromolecule #15: Chlorophyll a-b binding protein, chloroplastic
+Macromolecule #16: Chlorophyll a-b binding protein, chloroplastic
+Macromolecule #17: Chlorophyll a-b binding protein, chloroplastic
+Macromolecule #18: Chlorophyll a-b binding protein, chloroplastic
+Macromolecule #19: Chlorophyll a-b binding protein, chloroplastic
+Macromolecule #20: Chlorophyll a-b binding protein, chloroplastic
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 8 |
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Vitrification | Cryogen name: ETHANE |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number real images: 12418 / Average electron dose: 46.8 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal magnification: 165000 |
Sample stage | Cooling holder cryogen: NITROGEN |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |