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- EMDB-35899: FCP heterodimer, Lhca2, and Lhcf5 together as the M1 side binds t... -
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Open data
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Basic information
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Title | FCP heterodimer, Lhca2, and Lhcf5 together as the M1 side binds to the PSII core in the diatom Thalassiosira pseudonana | |||||||||
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![]() | FCP / heterodimer / PHOTOSYNTHESIS | |||||||||
Function / homology | ![]() light-harvesting complex / photosynthesis, light harvesting in photosystem I / plastid / chlorophyll binding / response to light stimulus / membrane Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.19 Å | |||||||||
![]() | Li Z / Feng Y / Wang W / Shen JR | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of a diatom photosystem II supercomplex containing a member of Lhcx family and dimeric FCPII. Authors: Yue Feng / Zhenhua Li / Xiaoyi Li / Lili Shen / Xueyang Liu / Cuicui Zhou / Jinyang Zhang / Min Sang / Guangye Han / Wenqiang Yang / Tingyun Kuang / Wenda Wang / Jian-Ren Shen / ![]() ![]() Abstract: Diatoms rely on fucoxanthin chlorophyll -binding proteins (FCPs) for their great success in oceans, which have a great diversity in their pigment, protein compositions, and subunit organizations. We ...Diatoms rely on fucoxanthin chlorophyll -binding proteins (FCPs) for their great success in oceans, which have a great diversity in their pigment, protein compositions, and subunit organizations. We report a unique structure of photosystem II (PSII)-FCPII supercomplex from at 2.68-Å resolution by cryo-electron microscopy. FCPIIs within this PSII-FCPII supercomplex exist in dimers and monomers, and a homodimer and a heterodimer were found to bind to a PSII core. The FCPII homodimer is formed by Lhcf7 and associates with PSII through an Lhcx family antenna Lhcx6_1, whereas the heterodimer is formed by Lhcf6 and Lhcf11 and connects to the core together with an Lhcf5 monomer through Lhca2 monomer. An extended pigment network consisting of diatoxanthins, diadinoxanthins, fucoxanthins, and chlorophylls is revealed, which functions in efficient light harvesting, energy transfer, and dissipation. These results provide a structural basis for revealing the energy transfer and dissipation mechanisms and also for the structural diversity of FCP antennas in diatoms. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 238.2 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 19.9 KB 19.9 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 16.5 KB | Display | ![]() |
Images | ![]() | 128.2 KB | ||
Filedesc metadata | ![]() | 6.3 KB | ||
Others | ![]() ![]() | 442.4 MB 442.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 24.9 KB | Display | |
Data in CIF | ![]() | 32.7 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8j0dMC ![]() 8iwhC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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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: 0.88 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_35899_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_35899_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
+Entire : M1 local refinement in the PSII-FCPII from the Thalassiosira pseu...
+Supramolecule #1: M1 local refinement in the PSII-FCPII from the Thalassiosira pseu...
+Macromolecule #1: Fucoxanthin chl a/c protein, lhca clade
+Macromolecule #2: Fucoxanthin-chlorophyll a-c binding protein, plastid
+Macromolecule #3: Fucoxanthin chlorophyll a/c protein 6
+Macromolecule #4: Fucoxanthin chlorophyll a/c protein 5
+Macromolecule #5: CHLOROPHYLL A
+Macromolecule #6: Chlorophyll c1
+Macromolecule #7: (3S,3'S,5R,5'R,6S,6'R,8'R)-3,5'-dihydroxy-8-oxo-6',7'-didehydro-5...
+Macromolecule #8: (3S,3'R,5R,6S,7cis)-7',8'-didehydro-5,6-dihydro-5,6-epoxy-beta,be...
+Macromolecule #9: 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE
+Macromolecule #10: 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
+Macromolecule #11: DIGALACTOSYL DIACYL GLYCEROL (DGDG)
+Macromolecule #12: Chlorophyll c2
+Macromolecule #13: DODECYL-BETA-D-MALTOSIDE
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 6.5 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 60.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |