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Open data
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Basic information
Entry | ![]() | |||||||||||||||
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Title | Photosystem I from the eukaryotic filamentous algae | |||||||||||||||
![]() | composite map | |||||||||||||||
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![]() | Photosystem I / Xanthophyceae / Tribonema minus / PHOTOSYNTHESIS | |||||||||||||||
Biological species | ![]() | |||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.82 Å | |||||||||||||||
![]() | Shao RQ / Pan XW | |||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Architecture of photosystem I-light-harvesting complex from the eukaryotic filamentous yellow-green alga Tribonema minus. Authors: Ruiqi Shao / Yuqi Zou / Hui Shang / Yue Qiu / Zuxing Liang / Xiaodong Su / Shumeng Zhang / Mei Li / Xiaowei Pan / ![]() Abstract: Eukaryotic photosystem I (PSI) is a multi-subunit pigment-protein supercomplex that consists of a core complex and multiple peripheral light-harvesting complexes I (LHCIs), which increases the light ...Eukaryotic photosystem I (PSI) is a multi-subunit pigment-protein supercomplex that consists of a core complex and multiple peripheral light-harvesting complexes I (LHCIs), which increases the light absorption capacity of the core complex. Throughout the evolution of oxygenic photoautotrophs, the core subunits of PSI have remained highly conserved, while LHCIs exhibit significant variability, presumably to adapt to diverse environments. This study presents a 2.82 Å resolution structure of PSI from the filamentous yellow-green alga Tribonema minus (Tm), a member of the class Xanthophyceae that evolved from red algae through endosymbiosis and is considered a promising candidate for biofuel production due to its high biomass and lipid content. Our structure reveals a supramolecular organization consisting of 12 core subunits and 13 LHCIs, here referred to as Xanthophyceae light-harvesting complexes (XLHs), along with the arrangement of pigments within the TmPSI-XLH supercomplex. A structural comparison between TmPSI-XLH and PSI-LHCI from various red lineages highlights distinctive features of TmPSI-XLH, suggesting that it represents a unique intermediate state in the PSI assembly process during the evolutionary transition from red algae to diatoms. Our findings advance the understanding of the molecular mechanisms responsible for energy transfer in Xanthophyceae PSI-XLH and the evolutionary adaptation of red lineages. | |||||||||||||||
History |
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Structure visualization
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Downloads & links
-EMDB archive
Map data | ![]() | 281.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 38.6 KB 38.6 KB | Display Display | ![]() |
Images | ![]() | 58.8 KB | ||
Filedesc metadata | ![]() | 9.8 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 606.2 KB | Display | ![]() |
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Full document | ![]() | 605.8 KB | Display | |
Data in XML | ![]() | 7.5 KB | Display | |
Data in CIF | ![]() | 8.7 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||
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Annotation | composite map | ||||||||||||||||||||
Voxel size | X=Y=Z: 1.04 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
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Sample components
+Entire : Photosystem I-Light-Harvesting Complexes from the Eukaryotic Fila...
+Supramolecule #1: Photosystem I-Light-Harvesting Complexes from the Eukaryotic Fila...
+Macromolecule #1: Light-harvesting protein XLH1
+Macromolecule #2: light-harvesting protein XLH2
+Macromolecule #3: light-harvesting protein XLH3
+Macromolecule #4: light-harvesting protein XLH4
+Macromolecule #5: light-harvesting protein XLH5
+Macromolecule #6: light-harvesting protein XLH6/10
+Macromolecule #7: light-harvesting protein XLH7
+Macromolecule #8: light-harvesting protein XLH8
+Macromolecule #9: light-harvesting protein XLH9/13
+Macromolecule #10: light-harvesting protein XLH11
+Macromolecule #11: light-harvesting protein XLH12
+Macromolecule #12: PsaA
+Macromolecule #13: PsaB
+Macromolecule #14: PsaC
+Macromolecule #15: PsaD
+Macromolecule #16: PsaE
+Macromolecule #17: PsaF
+Macromolecule #18: PsaI
+Macromolecule #19: PsaJ
+Macromolecule #20: PsaL
+Macromolecule #21: PsaM
+Macromolecule #22: PsaR
+Macromolecule #23: PsaS
+Macromolecule #24: CHLOROPHYLL A
+Macromolecule #25: BETA-CAROTENE
+Macromolecule #26: (3S,3'R,5R,6S,7cis)-7',8'-didehydro-5,6-dihydro-5,6-epoxy-beta,be...
+Macromolecule #27: DODECYL-BETA-D-MALTOSIDE
+Macromolecule #28: 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
+Macromolecule #29: (1~{R},3~{S})-6-[(3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{Z},17...
+Macromolecule #30: 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE
+Macromolecule #31: PHYLLOQUINONE
+Macromolecule #32: IRON/SULFUR CLUSTER
-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: 7.5 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TECNAI SPIRIT |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.2 µm / Nominal defocus min: 1.5 µm |
Experimental equipment | ![]() Model: Tecnai Spirit / Image courtesy: FEI Company |