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- PDB-7eh7: Cryo-EM structure of the octameric state of C-phycocyanin from Th... -
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Basic information
Entry | Database: PDB / ID: 7eh7 | |||||||||||||||
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Title | Cryo-EM structure of the octameric state of C-phycocyanin from Thermoleptolyngbya sp. O-77 | |||||||||||||||
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![]() | PHOTOSYNTHESIS / homo hexamer / light-harvesting complex | |||||||||||||||
Function / homology | ![]() : / phycobilisome / plasma membrane-derived thylakoid membrane / photosynthesis Similarity search - Function | |||||||||||||||
Biological species | ![]() | |||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.71 Å | |||||||||||||||
![]() | Minato, T. / Teramoto, T. / Adachi, N. / Hung, N.K. / Yamada, K. / Kawasaki, M. / Akutsu, M. / Moriya, T. / Senda, T. / Ogo, S. ...Minato, T. / Teramoto, T. / Adachi, N. / Hung, N.K. / Yamada, K. / Kawasaki, M. / Akutsu, M. / Moriya, T. / Senda, T. / Ogo, S. / Kakuta, Y. / Yoon, K.S. | |||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Non-conventional octameric structure of C-phycocyanin. Authors: Takuo Minato / Takamasa Teramoto / Naruhiko Adachi / Nguyen Khac Hung / Kaho Yamada / Masato Kawasaki / Masato Akutsu / Toshio Moriya / Toshiya Senda / Seiji Ogo / Yoshimitsu Kakuta / Ki-Seok Yoon / ![]() Abstract: C-phycocyanin (CPC), a blue pigment protein, is an indispensable component of giant phycobilisomes, which are light-harvesting antenna complexes in cyanobacteria that transfer energy efficiently to ...C-phycocyanin (CPC), a blue pigment protein, is an indispensable component of giant phycobilisomes, which are light-harvesting antenna complexes in cyanobacteria that transfer energy efficiently to photosystems I and II. X-ray crystallographic and electron microscopy (EM) analyses have revealed the structure of CPC to be a closed toroidal hexamer by assembling two trimers. In this study, the structural characterization of non-conventional octameric CPC is reported for the first time. Analyses of the crystal and cryogenic EM structures of the native CPC from filamentous thermophilic cyanobacterium Thermoleptolyngbya sp. O-77 unexpectedly illustrated the coexistence of conventional hexamer and novel octamer. In addition, an unusual dimeric state, observed via analytical ultracentrifugation, was postulated to be a key intermediate structure in the assemble of the previously unobserved octamer. These observations provide new insights into the assembly processes of CPCs and the mechanism of energy transfer in the light-harvesting complexes. | |||||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 437.5 KB | Display | ![]() |
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PDB format | ![]() | 386.4 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 31089MC ![]() 7efvC ![]() 7efwC ![]() 7eh8C M: map data used to model this data C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data size: 1.8 TB Data #1: Non-conventional octameric structure of C-phycocyanin [micrographs - multiframe]) |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 17560.531 Da / Num. of mol.: 8 / Source method: isolated from a natural source / Source: (natural) ![]() #2: Protein | Mass: 18097.465 Da / Num. of mol.: 8 / Source method: isolated from a natural source / Details: MEN: N-METHYL ASPARAGINE / Source: (natural) ![]() #3: Chemical | ChemComp-CYC / 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: C-phycocyanin octamer / Type: COMPLEX / Entity ID: #1-#2 / Source: NATURAL |
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Molecular weight | Value: 0.29 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() |
Buffer solution | pH: 7 |
Specimen | Conc.: 6.7 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: This sample was mono-disperse. |
Specimen support | Details: The grid was washed by acetone prior to use. / Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 291 K / Details: Blotting time was 5 seconds (blot force 15) |
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Electron microscopy imaging
Microscopy | Model: TFS TALOS |
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Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 120000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm |
Specimen holder | Cryogen: NITROGEN |
Image recording | Average exposure time: 49.2 sec. / Electron dose: 50 e/Å2 / Detector mode: COUNTING / Film or detector model: FEI FALCON III (4k x 4k) / Num. of grids imaged: 2 / Num. of real images: 2036 |
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Processing
Software | Name: PHENIX / Version: 1.19_4092: / Classification: refinement | ||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 129653 | ||||||||||||||||||||||||||||
Symmetry | Point symmetry: D4 (2x4 fold dihedral) | ||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.71 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 10402 / Algorithm: FOURIER SPACE / Num. of class averages: 1 / Symmetry type: POINT | ||||||||||||||||||||||||||||
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