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Open data
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Basic information
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| Title | Cryo-EM structure of cryptophyte photosystem II | |||||||||
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Keywords | Cryptophyte / Photosystem II / evolution / PHOTOSYNTHESIS | |||||||||
| Function / homology | Function and homology informationthylakoid membrane / photosystem II stabilization / photosystem II reaction center / photosystem II / oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor / photosynthetic electron transport chain / photosystem II / response to herbicide / chlorophyll binding / photosynthetic electron transport in photosystem II ...thylakoid membrane / photosystem II stabilization / photosystem II reaction center / photosystem II / oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor / photosynthetic electron transport chain / photosystem II / response to herbicide / chlorophyll binding / photosynthetic electron transport in photosystem II / : / phosphate ion binding / chloroplast thylakoid membrane / photosynthesis, light reaction / photosynthesis / chloroplast / respiratory electron transport chain / oxidoreductase activity / electron transfer activity / protein stabilization / iron ion binding / heme binding Similarity search - Function | |||||||||
| Biological species | Chroomonas placoidea (eukaryote) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 2.53 Å | |||||||||
Authors | Li K / Zhao LS / Zhang YZ / Liu LN | |||||||||
| Funding support | China, 1 items
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Citation | Journal: Nat Commun / Year: 2024Title: Structure of cryptophyte photosystem II-light-harvesting antennae supercomplex. Authors: Yu-Zhong Zhang / Kang Li / Bing-Yue Qin / Jian-Ping Guo / Quan-Bao Zhang / Dian-Li Zhao / Xiu-Lan Chen / Jun Gao / Lu-Ning Liu / Long-Sheng Zhao / ![]() Abstract: Cryptophytes are ancestral photosynthetic organisms evolved from red algae through secondary endosymbiosis. They have developed alloxanthin-chlorophyll a/c2-binding proteins (ACPs) as light- ...Cryptophytes are ancestral photosynthetic organisms evolved from red algae through secondary endosymbiosis. They have developed alloxanthin-chlorophyll a/c2-binding proteins (ACPs) as light-harvesting complexes (LHCs). The distinctive properties of cryptophytes contribute to efficient oxygenic photosynthesis and underscore the evolutionary relationships of red-lineage plastids. Here we present the cryo-electron microscopy structure of the Photosystem II (PSII)-ACPII supercomplex from the cryptophyte Chroomonas placoidea. The structure includes a PSII dimer and twelve ACPII monomers forming four linear trimers. These trimers structurally resemble red algae LHCs and cryptophyte ACPI trimers that associate with Photosystem I (PSI), suggesting their close evolutionary links. We also determine a Chl a-binding subunit, Psb-γ, essential for stabilizing PSII-ACPII association. Furthermore, computational calculation provides insights into the excitation energy transfer pathways. Our study lays a solid structural foundation for understanding the light-energy capture and transfer in cryptophyte PSII-ACPII, evolutionary variations in PSII-LHCII, and the origin of red-lineage LHCIIs. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_38596.map.gz | 56.2 MB | EMDB map data format | |
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| Header (meta data) | emd-38596-v30.xml emd-38596.xml | 46.1 KB 46.1 KB | Display Display | EMDB header |
| FSC (resolution estimation) | emd_38596_fsc.xml | 13.1 KB | Display | FSC data file |
| Images | emd_38596.png | 203.7 KB | ||
| Filedesc metadata | emd-38596.cif.gz | 10.3 KB | ||
| Others | emd_38596_half_map_1.map.gz emd_38596_half_map_2.map.gz | 59.6 MB 59.6 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-38596 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-38596 | HTTPS FTP |
-Validation report
| Summary document | emd_38596_validation.pdf.gz | 980.6 KB | Display | EMDB validaton report |
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| Full document | emd_38596_full_validation.pdf.gz | 980.2 KB | Display | |
| Data in XML | emd_38596_validation.xml.gz | 18.2 KB | Display | |
| Data in CIF | emd_38596_validation.cif.gz | 24.4 KB | Display | |
| Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-38596 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-38596 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 8xr6MC M: atomic model generated by this map C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_38596.map.gz / Format: CCP4 / Size: 64 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: 1.06 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Half map: Structure of cryptophyte photosystem II
| File | emd_38596_half_map_1.map | ||||||||||||
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| Annotation | Structure of cryptophyte photosystem II | ||||||||||||
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| Density Histograms |
-Half map: Structure of cryptophyte photosystem II
| File | emd_38596_half_map_2.map | ||||||||||||
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| Annotation | Structure of cryptophyte photosystem II | ||||||||||||
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| Density Histograms |
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Sample components
+Entire : Photosystem II of cryptophyte
+Supramolecule #1: Photosystem II of cryptophyte
+Macromolecule #1: Photosystem II protein D1
+Macromolecule #2: ACPII-4
+Macromolecule #3: ACPII-1
+Macromolecule #4: ACPII-2
+Macromolecule #5: ACPII-3
+Macromolecule #6: ACPII-5
+Macromolecule #7: ACPII-6
+Macromolecule #8: Photosystem II CP47 reaction center protein
+Macromolecule #9: PsbC_CP43
+Macromolecule #10: Photosystem II D2 protein
+Macromolecule #11: Cytochrome b559 subunit alpha
+Macromolecule #12: Cytochrome b559 subunit beta
+Macromolecule #13: Photosystem II reaction center protein H
+Macromolecule #14: Photosystem II reaction center protein I
+Macromolecule #15: Photosystem II reaction center protein J
+Macromolecule #16: Photosystem II reaction center protein K
+Macromolecule #17: Photosystem II reaction center protein L
+Macromolecule #18: PsbM
+Macromolecule #19: Psb-gama_linker
+Macromolecule #20: PsbO
+Macromolecule #21: PsbQ
+Macromolecule #22: Photosystem II reaction center protein T
+Macromolecule #23: PsbU
+Macromolecule #24: Photosystem II cytochrome c550
+Macromolecule #25: PsbW
+Macromolecule #26: Photosystem II reaction center protein X
+Macromolecule #27: Photosystem II reaction center protein Psb30
+Macromolecule #28: Photosystem II reaction center protein Z
+Macromolecule #29: CA-MN4-O5 CLUSTER
+Macromolecule #30: FE (II) ION
+Macromolecule #31: BICARBONATE ION
+Macromolecule #32: CHLORIDE ION
+Macromolecule #33: CHLOROPHYLL A
+Macromolecule #34: PHEOPHYTIN A
+Macromolecule #35: (6'R,11cis,11'cis,13cis,15cis)-4',5'-didehydro-5',6'-dihydro-beta...
+Macromolecule #36: 2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,...
+Macromolecule #37: 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
+Macromolecule #38: Chlorophyll c2
+Macromolecule #39: (1~{R})-3,5,5-trimethyl-4-[(3~{E},5~{E},7~{E},9~{E},11~{E},13~{E}...
+Macromolecule #40: (1~{R})-3,5,5-trimethyl-4-[(3~{E},5~{E},7~{E},9~{E},11~{E},13~{E}...
+Macromolecule #41: 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL
+Macromolecule #42: 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE
+Macromolecule #43: DIGALACTOSYL DIACYL GLYCEROL (DGDG)
+Macromolecule #44: PROTOPORPHYRIN IX CONTAINING FE
+Macromolecule #45: water
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | 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: 50.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.8 µm / Nominal defocus min: 1.0 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi




Keywords
Chroomonas placoidea (eukaryote)
Authors
China, 1 items
Citation









Z (Sec.)
Y (Row.)
X (Col.)



















































Processing
FIELD EMISSION GUN

