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Open data
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Basic information
Entry | Database: PDB / ID: 8xkl | ||||||
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Title | Structure of ACPII-CCPII from cryptophyte algae | ||||||
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![]() | STRUCTURAL PROTEIN / Photosystem II / PHOTOSYNTHESIS | ||||||
Function / homology | Chem-8CT / CHLOROPHYLL A / Chem-IHT / Chem-II0 / Chem-II3 / Chlorophyll c2 / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE / Chem-SQD![]() | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.84 Å | ||||||
![]() | Li, X.Y. / Mao, Z.Y. / Shen, J.R. / Han, G.Y. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structure and distinct supramolecular organization of a PSII-ACPII dimer from a cryptophyte alga Chroomonas placoidea. Authors: Zhiyuan Mao / Xingyue Li / Zhenhua Li / Liangliang Shen / Xiaoyi Li / Yanyan Yang / Wenda Wang / Tingyun Kuang / Jian-Ren Shen / Guangye Han / ![]() ![]() Abstract: Cryptophyte algae are an evolutionarily distinct and ecologically important group of photosynthetic unicellular eukaryotes. Photosystem II (PSII) of cryptophyte algae associates with alloxanthin ...Cryptophyte algae are an evolutionarily distinct and ecologically important group of photosynthetic unicellular eukaryotes. Photosystem II (PSII) of cryptophyte algae associates with alloxanthin chlorophyll a/c-binding proteins (ACPs) to act as the peripheral light-harvesting system, whose supramolecular organization is unknown. Here, we purify the PSII-ACPII supercomplex from a cryptophyte alga Chroomonas placoidea (C. placoidea), and analyze its structure at a resolution of 2.47 Å using cryo-electron microscopy. This structure reveals a dimeric organization of PSII-ACPII containing two PSII core monomers flanked by six symmetrically arranged ACPII subunits. The PSII core is conserved whereas the organization of ACPII subunits exhibits a distinct pattern, different from those observed so far in PSII of other algae and higher plants. Furthermore, we find a Chl a-binding antenna subunit, CCPII-S, which mediates interaction of ACPII with the PSII core. These results provide a structural basis for the assembly of antennas within the supercomplex and possible excitation energy transfer pathways in cryptophyte algal PSII, shedding light on the diversity of supramolecular organization of photosynthetic machinery. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 406.4 KB | Display | ![]() |
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PDB format | ![]() | 347.9 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 38419MC ![]() 8wb4C M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
-Protein , 8 types, 8 molecules 0789GPps
#1: Protein | Mass: 23734.623 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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#2: Protein | Mass: 25151.223 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#3: Protein | Mass: 23471.201 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#4: Protein | Mass: 24055.020 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#5: Protein | Mass: 5464.728 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#6: Protein | Mass: 23923.801 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#7: Protein | Mass: 23762.242 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
#8: Protein | Mass: 30531.848 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
-Non-polymers , 9 types, 112 molecules ![](data/chem/img/CLA.gif)
![](data/chem/img/KC2.gif)
![](data/chem/img/IHT.gif)
![](data/chem/img/II0.gif)
![](data/chem/img/LMG.gif)
![](data/chem/img/II3.gif)
![](data/chem/img/LHG.gif)
![](data/chem/img/8CT.gif)
![](data/chem/img/SQD.gif)
![](data/chem/img/KC2.gif)
![](data/chem/img/IHT.gif)
![](data/chem/img/II0.gif)
![](data/chem/img/LMG.gif)
![](data/chem/img/II3.gif)
![](data/chem/img/LHG.gif)
![](data/chem/img/8CT.gif)
![](data/chem/img/SQD.gif)
#9: Chemical | ChemComp-CLA / #10: Chemical | ChemComp-KC2 / #11: Chemical | ChemComp-IHT / ( #12: Chemical | ChemComp-II0 / ( #13: Chemical | ChemComp-LMG / #14: Chemical | #15: Chemical | #16: Chemical | #17: Chemical | ChemComp-SQD / | |
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-Details
Has ligand of interest | Y |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Structure of ACPII-CCPII from cryptophyte algae / Type: COMPLEX / Entity ID: #1-#8 / Source: NATURAL |
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Source (natural) | Organism: ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 60 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 2.84 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 610800 / Symmetry type: POINT |