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- EMDB-0726: Structure of PSI from H. hongdechloris grown under white light co... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-0726 | |||||||||
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Title | Structure of PSI from H. hongdechloris grown under white light condition | |||||||||
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![]() | Photosystem I / ELECTRON TRANSPORT | |||||||||
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 / membrane => GO:0016020 ...: / 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 / membrane => GO:0016020 / electron transfer activity / oxidoreductase activity / magnesium ion binding / metal ion binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.35 Å | |||||||||
![]() | Kato K / Nagao R | |||||||||
![]() | ![]() Title: Structural basis for the adaptation and function of chlorophyll f in photosystem I. Authors: Koji Kato / Toshiyuki Shinoda / Ryo Nagao / Seiji Akimoto / Takehiro Suzuki / Naoshi Dohmae / Min Chen / Suleyman I Allakhverdiev / Jian-Ren Shen / Fusamichi Akita / Naoyuki Miyazaki / Tatsuya Tomo / ![]() ![]() ![]() Abstract: Chlorophylls (Chl) play pivotal roles in energy capture, transfer and charge separation in photosynthesis. Among Chls functioning in oxygenic photosynthesis, Chl f is the most red-shifted type first ...Chlorophylls (Chl) play pivotal roles in energy capture, transfer and charge separation in photosynthesis. Among Chls functioning in oxygenic photosynthesis, Chl f is the most red-shifted type first found in a cyanobacterium Halomicronema hongdechloris. The location and function of Chl f in photosystems are not clear. Here we analyzed the high-resolution structures of photosystem I (PSI) core from H. hongdechloris grown under white or far-red light by cryo-electron microscopy. The structure showed that, far-red PSI binds 83 Chl a and 7 Chl f, and Chl f are associated at the periphery of PSI but not in the electron transfer chain. The appearance of Chl f is well correlated with the expression of PSI genes induced under far-red light. These results indicate that Chl f functions to harvest the far-red light and enhance uphill energy transfer, and changes in the gene sequences are essential for the binding of Chl f. | |||||||||
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 | ![]() | 24 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 22.7 KB 22.7 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 12.7 KB | Display | ![]() |
Images | ![]() | 97.2 KB | ||
Filedesc metadata | ![]() | 7.4 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6kmwMC ![]() 0727C ![]() 6kmxC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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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: 0.87 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
+Entire : white PSI
+Supramolecule #1: white PSI
+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 VIII
+Macromolecule #7: Photosystem I reaction center subunit XI
+Macromolecule #8: Photosystem I reaction center subunit XII
+Macromolecule #9: CHLOROPHYLL A ISOMER
+Macromolecule #10: CHLOROPHYLL A
+Macromolecule #11: PHYLLOQUINONE
+Macromolecule #12: IRON/SULFUR CLUSTER
+Macromolecule #13: BETA-CAROTENE
+Macromolecule #14: 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
+Macromolecule #15: DODECYL-BETA-D-MALTOSIDE
+Macromolecule #16: 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE
+Macromolecule #17: UNKNOWN LIGAND
+Macromolecule #18: CALCIUM ION
+Macromolecule #19: 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 | 0.032 mg/mL | |||||||||
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Buffer | pH: 6.5 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 30 sec. | |||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Average electron dose: 47.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |