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Entry
Database: PDB / ID: 6jo6
TitleStructure of the green algal photosystem I supercomplex with light-harvesting complex I
Components
  • (Chlorophyll a-b binding protein, ...Light-harvesting complexes of green plants) x 7
  • (Photosystem I P700 chlorophyll a apoprotein ...) x 2
  • (Photosystem I reaction center subunit ...) x 8
  • Photosystem I iron-sulfur center
KeywordsPHOTOSYNTHESIS / photosystem membrane protein
Function / homology
Function and homology information


photosynthesis, light harvesting in photosystem I / chloroplast thylakoid lumen / photosynthesis, light harvesting / photosystem I reaction center / photosynthetic electron transport in photosystem I / photosystem I / photosystem I / photosystem II / chlorophyll binding / chloroplast thylakoid membrane ...photosynthesis, light harvesting in photosystem I / chloroplast thylakoid lumen / photosynthesis, light harvesting / photosystem I reaction center / photosynthetic electron transport in photosystem I / photosystem I / photosystem I / photosystem II / chlorophyll binding / chloroplast thylakoid membrane / response to light stimulus / photosynthesis / 4 iron, 4 sulfur cluster binding / protein-chromophore linkage / electron transfer activity / magnesium ion binding / integral component of membrane / metal ion binding
Similarity search - Function
Chlorophyll a/b binding protein domain / Chlorophyll a-b binding protein / Photosystem I PsaA/PsaB / Photosystem I p700 chlorophyll A apoprotein A1 / Photosystem I, reaction centre, subunit PsaF / Photosystem I PsaD, reaction center subunit II / Photosystem 1 Reaction Centre Subunit Ii; Chain: D; / Photosystem I PsaG, plant / Photosystem I reaction centre subunit PsaK, chloroplastic / Photosystem I PsaG/PsaK domain, chloroplastic ...Chlorophyll a/b binding protein domain / Chlorophyll a-b binding protein / Photosystem I PsaA/PsaB / Photosystem I p700 chlorophyll A apoprotein A1 / Photosystem I, reaction centre, subunit PsaF / Photosystem I PsaD, reaction center subunit II / Photosystem 1 Reaction Centre Subunit Ii; Chain: D; / Photosystem I PsaG, plant / Photosystem I reaction centre subunit PsaK, chloroplastic / Photosystem I PsaG/PsaK domain, chloroplastic / Photosystem I PsaG/PsaK, plant / Photosystem I psaG and psaK proteins signature. / SH3 type barrels. - #50 / Photosystem I reaction centre subunit VIII / Photosystem I reaction centre subunit VIII / Chlorophyll A-B binding protein, plant and chromista / : / Photosystem I PsaG/PsaK protein / Chlorophyll A-B binding protein / Chlorophyll A-B binding protein / Photosystem I psaG / psaK / Photosystem I PsaF, reaction centre subunit III superfamily / Photosystem I, reaction centre subunit XI / Photosystem I PsaF, reaction centre subunit III / Photosystem I PsaL, reaction centre subunit XI superfamily / Photosystem I reaction centre subunit III / Photosystem I reaction centre subunit XI / Photosystem I PsaL, reaction centre subunit XI / Photosystem I reaction centre subunit VIII superfamily / Photosystem I PsaD / PsaD / Photosystem I, reaction centre subunit PsaD superfamily / Photosystem I PsaJ, reaction centre subunit IX / Photosystem I reaction centre subunit IX / PsaJ / Photosystem I PsaJ, reaction centre subunit IX superfamily / Photosystem I PsaE, reaction centre subunit IV / Photosystem I reaction centre subunit IV / PsaE / Photosystem I protein PsaC / Photosystem I PsaB / Photosystem I PsaA/PsaB, conserved site / Photosystem I psaA and psaB proteins signature. / Photosystem I PsaA / Photosystem I PsaA/PsaB / Photosystem I PsaA/PsaB superfamily / Photosystem I psaA/psaB protein / Electron transport accessory-like domain superfamily / Alpha-Beta Plaits - #20 / 4Fe-4S dicluster domain / 4Fe-4S ferredoxin-type iron-sulfur binding region signature. / 4Fe-4S ferredoxin, iron-sulphur binding, conserved site / 4Fe-4S ferredoxin-type iron-sulfur binding domain profile. / 4Fe-4S ferredoxin-type, iron-sulphur binding domain / Helicase, Ruva Protein; domain 3 / SH3 type barrels. / Roll / Alpha-Beta Plaits / Up-down Bundle / 2-Layer Sandwich / Orthogonal Bundle / Mainly Beta / Mainly Alpha / Alpha Beta
Similarity search - Domain/homology
Photosystem I reaction center subunit V, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Photosystem I reaction center subunit psaK, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Photosystem I reaction center subunit IX / Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Photosystem I reaction center subunit II, chloroplastic / Chlorophyll a-b binding protein, chloroplastic ...Photosystem I reaction center subunit V, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Photosystem I reaction center subunit psaK, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Photosystem I reaction center subunit IX / Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Photosystem I reaction center subunit II, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Photosystem I iron-sulfur center / Photosystem I reaction center subunit IV, chloroplastic / Photosystem I reaction center subunit III, chloroplastic / BETA-CAROTENE / Photosystem I P700 chlorophyll a apoprotein A1 / Photosystem I P700 chlorophyll a apoprotein A2 / Chlorophyll a-b binding protein, chloroplastic / PSI subunit V / Photosystem I reaction center subunit VIII / CHLOROPHYLL B / IRON/SULFUR CLUSTER / PHYLLOQUINONE / Chem-LUT / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / DIGALACTOSYL DIACYL GLYCEROL (DGDG) / CHLOROPHYLL A / CHLOROPHYLL A ISOMER / Chlorophyll a-b binding protein, chloroplastic
Similarity search - Component
Biological speciesChlamydomonas reinhardtii (plant)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsSuga, M. / Miyazaki, N. / Takahashi, Y.
Funding support Japan, 3items
OrganizationGrant numberCountry
Japan Society for the Promotion of ScienceJP16H06554 Japan
Japan Society for the Promotion of ScienceJP16H06162 Japan
Japan Society for the Promotion of ScienceJP16H06296 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, 2019Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jun 19, 2019Provider: repository / Type: Initial release
Revision 1.1Jun 26, 2019Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.name

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Structure visualization

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Assembly

Deposited unit
A: Photosystem I P700 chlorophyll a apoprotein A1
B: Photosystem I P700 chlorophyll a apoprotein A2
C: Photosystem I iron-sulfur center
D: Photosystem I reaction center subunit II, chloroplastic
E: Photosystem I reaction center subunit IV, chloroplastic
F: Photosystem I reaction center subunit F, Photosystem I reaction center subunit III, chloroplastic
G: Photosystem I reaction center subunit V, chloroplastic
I: Photosystem I reaction center subunit VIII
J: Photosystem I reaction center subunit IX
K: Photosystem I reaction center subunit psaK, chloroplastic
L: Photosystem I reaction center subunit XI
1: Chlorophyll a-b binding protein, chloroplastic
3: Chlorophyll a-b binding protein, chloroplastic
7: Chlorophyll a-b binding protein, chloroplastic
8: Chlorophyll a-b binding protein, chloroplastic
Z: Chlorophyll a-b binding protein, chloroplastic
4: Chlorophyll a-b binding protein, chloroplastic
5: Chlorophyll a-b binding protein, chloroplastic
6: Chlorophyll a-b binding protein, chloroplastic
hetero molecules


Theoretical massNumber of molelcules
Total (without water)696,899304
Polymers463,86619
Non-polymers233,033285
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: assay for oligomerization
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Photosystem I P700 chlorophyll a apoprotein ... , 2 types, 2 molecules AB

#1: Protein Photosystem I P700 chlorophyll a apoprotein A1 / / PSI-A / PsaA


Mass: 83239.203 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: psaA, ps1a1 / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: P12154, photosystem I
#2: Protein Photosystem I P700 chlorophyll a apoprotein A2 / / PSI-B / PsaB


Mass: 84947.195 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: psaB, ps1a2 / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: P09144, photosystem I

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Photosystem I reaction center subunit ... , 8 types, 8 molecules DEFGIJKL

#4: Protein Photosystem I reaction center subunit II, chloroplastic / / Photosystem I peripheral protein D / Photosystem I 20 kDa subunit / PSI-D


Mass: 17732.496 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: psaD / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: Q39615
#5: Protein Photosystem I reaction center subunit IV, chloroplastic / / Photosystem I peripheral protein E / PSI-E / P30 protein / Photosystem I 8.1 kDa protein


Mass: 8135.226 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: PSAE / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: P12352
#6: Protein Photosystem I reaction center subunit F, Photosystem I reaction center subunit III, chloroplastic / / Light-harvesting complex I 17 kDa protein / P21 protein / PSI-F


Mass: 17957.773 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: PSAF / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: P12356
#7: Protein Photosystem I reaction center subunit V, chloroplastic / / Photosystem I reaction center subunit G / Light-harvesting complex I 10 kDa protein / P35 protein / PSI-G


Mass: 9828.936 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: PSAG / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: P14224
#8: Protein Photosystem I reaction center subunit VIII / / Photosystem I reaction center subunit I


Mass: 10586.388 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: PSAI / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: A8IFG7
#9: Protein/peptide Photosystem I reaction center subunit IX / / Photosystem I reaction center subunit J / PSI-J


Mass: 4750.509 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: psaJ / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: P59777
#10: Protein Photosystem I reaction center subunit psaK, chloroplastic / / Photosystem I reaction center subunit K / Light-harvesting complex I 8.4 kDa protein / P37 protein ...Photosystem I reaction center subunit K / Light-harvesting complex I 8.4 kDa protein / P37 protein / PSI-K / Photosystem I subunit X


Mass: 8431.764 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: PSAK / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: P14225
#11: Protein Photosystem I reaction center subunit XI / / Photosystem I reaction center protein L


Mass: 16120.512 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: PSAL, CHLRE_12g486300v5, CHLREDRAFT_205935 / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: A8IL32

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Chlorophyll a-b binding protein, ... , 7 types, 8 molecules 1Z378456

#12: Protein Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein 1


Mass: 20368.023 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: cabI-1 / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: Q7DM26, UniProt: Q05093*PLUS
#13: Protein Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein 3


Mass: 29435.598 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: LHCA3, CHLREDRAFT_153678 / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: A8JF10
#14: Protein Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein 7


Mass: 23446.553 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: Lhca, CHLRE_16g687900v5 / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: Q84Y02
#15: Protein Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein 8


Mass: 23293.613 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: LhcI-4, LHCA8, CHLRE_06g272650v5, CHLREDRAFT_187025 / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: Q75VY7
#16: Protein Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein 4


Mass: 25906.434 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: LhcI-1, CHLRE_10g452050v5 / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: Q75VZ0
#17: Protein Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein 5


Mass: 25264.959 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: LhcI-3, LHCA5, CHLRE_10g425900v5, CHLREDRAFT_186299 / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: Q75VY8
#18: Protein Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein 6


Mass: 25183.152 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: LhcI-5, LHCA6, CHLRE_06g278213v5, CHLREDRAFT_192961 / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: Q75VY6

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Protein / Sugars , 2 types, 2 molecules C

#25: Sugar ChemComp-DGD / DIGALACTOSYL DIACYL GLYCEROL (DGDG)


Type: saccharideCarbohydrate / Mass: 949.299 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C51H96O15
#3: Protein Photosystem I iron-sulfur center / / PsaC


Mass: 8869.325 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chlamydomonas reinhardtii (plant) / Gene: psaC / Production host: Chlamydomonas reinhardtii (plant) / References: UniProt: Q00914, photosystem I

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Non-polymers , 9 types, 284 molecules

#19: Chemical ChemComp-CL0 / CHLOROPHYLL A ISOMER / Chlorophyll a


Mass: 893.489 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C55H72MgN4O5
#20: Chemical...
ChemComp-CLA / CHLOROPHYLL A / Chlorophyll a


Mass: 893.489 Da / Num. of mol.: 197 / Source method: obtained synthetically / Formula: C55H72MgN4O5
#21: Chemical ChemComp-PQN / PHYLLOQUINONE / VITAMIN K1 / 2-METHYL-3-PHYTYL-1,4-NAPHTHOQUINONE / Phytomenadione


Mass: 450.696 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C31H46O2
#22: Chemical
ChemComp-LHG / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / Phosphatidylglycerol


Mass: 722.970 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: C38H75O10P / Comment: phospholipid*YM
#23: Chemical...
ChemComp-BCR / BETA-CAROTENE / Β-Carotene


Mass: 536.873 Da / Num. of mol.: 32 / Source method: obtained synthetically / Formula: C40H56
#24: Chemical ChemComp-SF4 / IRON/SULFUR CLUSTER / Iron–sulfur cluster


Mass: 351.640 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: Fe4S4
#26: Chemical ChemComp-LMG / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE


Mass: 787.158 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C45H86O10
#27: Chemical
ChemComp-CHL / CHLOROPHYLL B / Chlorophyll b


Mass: 907.472 Da / Num. of mol.: 18 / Source method: obtained synthetically / Formula: C55H70MgN4O6
#28: Chemical
ChemComp-LUT / (3R,3'R,6S)-4,5-DIDEHYDRO-5,6-DIHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL / (3R,3'R)-BETA,BETA-CAROTENE-3,3'-DIOL, LUTEIN / Lutein


Mass: 568.871 Da / Num. of mol.: 18 / Source method: obtained synthetically / Formula: C40H56O2

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Details

Sequence detailsAuthors made a transformant which bears 20 x His insertion in the N-terminal region.

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Photosystem I - Light Harvesting Complex I supercomplex
Type: COMPLEX / Entity ID: #1-#18 / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Chlamydomonas reinhardtii (plant)
Source (recombinant)Organism: Chlamydomonas reinhardtii (plant)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: MOLYBDENUM / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 3750 nm / Nominal defocus min: 1600 nm / C2 aperture diameter: 100 µm
Specimen holderCryogen: NITROGEN / Model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 2.5 sec. / Electron dose: 50 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k) / Num. of grids imaged: 2 / Num. of real images: 9801

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Processing

SoftwareName: PHENIX / Version: 1.13_2998: / Classification: refinement
EM software
IDNameVersionCategory
1RELION3particle selection
2EPUimage acquisition
4GctfCTF correction
10RELION3initial Euler assignment
11RELION3final Euler assignment
12RELION3classification
13RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 379749 / Symmetry type: POINT

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