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- EMDB-9856: Structure of the green algal photosystem I supercomplex with ligh... -

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Basic information

Entry
Database: EMDB / ID: EMD-9856
TitleStructure of the green algal photosystem I supercomplex with light-harvesting complex I
Map data
Sample
  • Complex: Photosystem I - Light Harvesting Complex I supercomplex
Biological speciesChlamydomonas reinhardtii (plant)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsSuga M / Miyazaki N
Funding support Japan, 3 items
OrganizationGrant numberCountry
Japan Society for the Promotion of ScienceJP16H06554 Japan
Japan Society for the Promotion of ScienceJP16H06296 Japan
Japan Society for the Promotion of ScienceJP16H06162 Japan
CitationJournal: Nat Plants / Year: 2019
Title: Structure of the green algal photosystem I supercomplex with a decameric light-harvesting complex I.
Authors: Michihiro Suga / Shin-Ichiro Ozawa / Kaori Yoshida-Motomura / Fusamichi Akita / Naoyuki Miyazaki / Yuichiro Takahashi /
Abstract: In plants and green algae, the core of photosystem I (PSI) is surrounded by a peripheral antenna system consisting of light-harvesting complex I (LHCI). Here we report the cryo-electron ...In plants and green algae, the core of photosystem I (PSI) is surrounded by a peripheral antenna system consisting of light-harvesting complex I (LHCI). Here we report the cryo-electron microscopic structure of the PSI-LHCI supercomplex from the green alga Chlamydomonas reinhardtii. The structure reveals that eight Lhca proteins form two tetrameric LHCI belts attached to the PsaF side while the other two Lhca proteins form an additional Lhca2/Lhca9 heterodimer attached to the opposite side. The spatial arrangement of light-harvesting pigments reveals that Chlorophylls b are more abundant in the outer LHCI belt than in the inner LHCI belt and are absent from the core, thereby providing the downhill energy transfer pathways to the PSI core. PSI-LHCI is complexed with a plastocyanin on the patch of lysine residues of PsaF at the luminal side. The assembly provides a structural basis for understanding the mechanism of light-harvesting, excitation energy transfer of the PSI-LHCI supercomplex and electron transfer with plastocyanin.
History
DepositionMar 20, 2019-
Header (metadata) releaseJun 19, 2019-
Map releaseJun 19, 2019-
UpdateJun 26, 2019-
Current statusJun 26, 2019Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_9856.png

Downloads & links

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Map

FileDownload / File: emd_9856.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.12 Å
Density
Contour LevelBy AUTHOR: 0.05 / Movie #1: 0.05
Minimum - Maximum-0.21057768 - 0.39129108
Average (Standard dev.)0.00082593877 (±0.010227886)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 358.4 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.121.121.12
M x/y/z320320320
origin x/y/z0.0000.0000.000
length x/y/z358.400358.400358.400
α/β/γ90.00090.00090.000
start NX/NY/NZ-64-64-64
NX/NY/NZ128128128
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS320320320
D min/max/mean-0.2110.3910.001

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Supplemental data

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Sample components

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Entire : Photosystem I - Light Harvesting Complex I supercomplex

EntireName: Photosystem I - Light Harvesting Complex I supercomplex
Components
  • Complex: Photosystem I - Light Harvesting Complex I supercomplex

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Supramolecule #1: Photosystem I - Light Harvesting Complex I supercomplex

SupramoleculeName: Photosystem I - Light Harvesting Complex I supercomplex
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#19
Source (natural)Organism: Chlamydomonas reinhardtii (plant)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 3.75 µm / Nominal defocus min: 1.6 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Number grids imaged: 2 / Number real images: 10989 / Average exposure time: 2.5 sec. / Average electron dose: 50.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: Gctf
Initial angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 3.0)
Final 3D classificationNumber classes: 3 / Avg.num./class: 230000 / Software - Name: RELION (ver. 3.0)
Final angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 3.0)
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 358657

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