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- EMDB-0977: Cyanobacterial PSI Monomer from T. elongatus by Single Particle C... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-0977 | |||||||||
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Title | Cyanobacterial PSI Monomer from T. elongatus by Single Particle CRYO-EM at 3.2 A Resolution | |||||||||
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![]() | monomer / complex / photosystem / photosynthesis / MEMBRANE PROTEIN | |||||||||
Function / homology | ![]() photosystem I reaction center / photosystem I / photosystem I / plasma membrane-derived thylakoid membrane / chlorophyll binding / photosynthetic electron transport in photosystem I / photosynthesis / 4 iron, 4 sulfur cluster binding / oxidoreductase activity / electron transfer activity ...photosystem I reaction center / photosystem I / photosystem I / plasma membrane-derived thylakoid membrane / chlorophyll binding / photosynthetic electron transport in photosystem I / photosynthesis / 4 iron, 4 sulfur cluster binding / oxidoreductase activity / electron transfer activity / magnesium ion binding / metal ion binding Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
![]() | Kurisu G / Coruh O | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM structure of a functional monomeric Photosystem I from Thermosynechococcus elongatus reveals red chlorophyll cluster. Authors: Orkun Çoruh / Anna Frank / Hideaki Tanaka / Akihiro Kawamoto / Eithar El-Mohsnawy / Takayuki Kato / Keiichi Namba / Christoph Gerle / Marc M Nowaczyk / Genji Kurisu / ![]() ![]() ![]() Abstract: A high-resolution structure of trimeric cyanobacterial Photosystem I (PSI) from Thermosynechococcus elongatus was reported as the first atomic model of PSI almost 20 years ago. However, the monomeric ...A high-resolution structure of trimeric cyanobacterial Photosystem I (PSI) from Thermosynechococcus elongatus was reported as the first atomic model of PSI almost 20 years ago. However, the monomeric PSI structure has not yet been reported despite long-standing interest in its structure and extensive spectroscopic characterization of the loss of red chlorophylls upon monomerization. Here, we describe the structure of monomeric PSI from Thermosynechococcus elongatus BP-1. Comparison with the trimer structure gave detailed insights into monomerization-induced changes in both the central trimerization domain and the peripheral regions of the complex. Monomerization-induced loss of red chlorophylls is assigned to a cluster of chlorophylls adjacent to PsaX. Based on our findings, we propose a role of PsaX in the stabilization of red chlorophylls and that lipids of the surrounding membrane present a major source of thermal energy for uphill excitation energy transfer from red chlorophylls to P700. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 59.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 34.4 KB 34.4 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 9.2 KB | Display | ![]() |
Images | ![]() | 296.5 KB | ||
Filedesc metadata | ![]() | 8.3 KB | ||
Others | ![]() ![]() | 49.6 MB 49.7 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6lu1MC ![]() 7bw2C M: atomic model generated by this map C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data size: 226.1 Data #1: Raw, non aligned micrograph movies in compressed TIFF format. [micrographs - multiframe]) |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 0.89 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Half map: #1
File | emd_0977_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #2
File | emd_0977_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
+Entire : Cyanobacterial PSI Monomer from T. elongatus
+Supramolecule #1: Cyanobacterial PSI Monomer from T. elongatus
+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
+Macromolecule #5: Photosystem I reaction center subunit IV
+Macromolecule #6: Photosystem I reaction center subunit III
+Macromolecule #7: Photosystem I reaction center subunit VIII
+Macromolecule #8: Photosystem I reaction center subunit IX
+Macromolecule #9: Photosystem I reaction center subunit XI
+Macromolecule #10: Photosystem I reaction center subunit XII
+Macromolecule #11: CHLOROPHYLL A
+Macromolecule #12: PHYLLOQUINONE
+Macromolecule #13: BETA-CAROTENE
+Macromolecule #14: 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
+Macromolecule #15: IRON/SULFUR CLUSTER
+Macromolecule #16: 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE
+Macromolecule #17: water
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 5 mg/mL | ||||||||||||
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Buffer | pH: 7.5 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Support film - Film thickness: 20 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. | ||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV | ||||||||||||
Details | Sample was monodisperse. |
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Electron microscopy
Microscope | JEOL CRYO ARM 200 |
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Temperature | Min: 100.4 K / Max: 100.4 K |
Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3710 pixel / Digitization - Dimensions - Height: 3838 pixel / Digitization - Frames/image: 1-60 / Number grids imaged: 1 / Average exposure time: 12.0 sec. / Average electron dose: 1.34 e/Å2 |
Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | Calibrated defocus max: 3.5 µm / Calibrated defocus min: 0.5 µm / Calibrated magnification: 56497 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 1.4 mm / Nominal magnification: 60000 |
Sample stage | Specimen holder model: JEOL / Cooling holder cryogen: NITROGEN |