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- PDB-7zq9: Dimeric PSI of Chlamydomonas reinhardtii at 2.74 A resolution (sy... -

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Basic information

Entry
Database: PDB / ID: 7zq9
TitleDimeric PSI of Chlamydomonas reinhardtii at 2.74 A resolution (symmetry expanded)
Components
  • (Chlorophyll a-b binding protein, ...) x 8
  • (Photosystem I P700 chlorophyll a apoprotein ...) x 3
  • (Photosystem I reaction center subunit ...) x 7
  • PSI subunit V
  • Photosystem I iron-sulfur center
KeywordsPHOTOSYNTHESIS / green algae / dimeric PSI
Function / homology
Function and homology information


photosynthesis, light harvesting / chloroplast thylakoid lumen / photosynthesis, light harvesting in photosystem I / photosystem I reaction center / photosystem I / photosynthetic electron transport in photosystem I / photosystem I / photosystem II / chloroplast thylakoid membrane / chlorophyll binding ...photosynthesis, light harvesting / chloroplast thylakoid lumen / photosynthesis, light harvesting in photosystem I / photosystem I reaction center / photosystem I / photosynthetic electron transport in photosystem I / photosystem I / photosystem II / chloroplast thylakoid membrane / chlorophyll binding / response to light stimulus / photosynthesis / 4 iron, 4 sulfur cluster binding / electron transfer activity / oxidoreductase activity / magnesium ion binding / metal ion binding
Similarity search - Function
Photosystem I reaction center subunit V / Photosystem I reaction center subunit psaK, plant / Photosystem I reaction center subunit V/PsaK, plant / Photosystem I PsaG/PsaK domain, chloroplastic / Photosystem I psaG and psaK proteins signature. / Photosystem I reaction center subunit V/PsaK / Photosystem I psaG / psaK / Photosystem I PsaL, reaction centre subunit XI / Photosystem I, reaction centre subunit XI / Photosystem I PsaL, reaction centre subunit XI superfamily ...Photosystem I reaction center subunit V / Photosystem I reaction center subunit psaK, plant / Photosystem I reaction center subunit V/PsaK, plant / Photosystem I PsaG/PsaK domain, chloroplastic / Photosystem I psaG and psaK proteins signature. / Photosystem I reaction center subunit V/PsaK / Photosystem I psaG / psaK / Photosystem I PsaL, reaction centre subunit XI / Photosystem I, reaction centre subunit XI / Photosystem I PsaL, reaction centre subunit XI superfamily / Photosystem I reaction centre subunit XI / Photosystem I reaction centre subunit VIII / Photosystem I reaction centre subunit VIII / Photosystem I reaction centre subunit VIII superfamily / Photosystem I PsaF, reaction centre subunit III / Photosystem I PsaF, reaction centre subunit III superfamily / Photosystem I reaction centre subunit III / Chlorophyll A-B binding protein, plant and chromista / Chlorophyll A-B binding protein / Chlorophyll A-B binding protein / Photosystem I PsaD / Photosystem I, reaction centre subunit PsaD superfamily / PsaD / Photosystem I PsaJ, reaction centre subunit IX / Photosystem I PsaJ, reaction centre subunit IX superfamily / Photosystem I reaction centre subunit IX / PsaJ / Photosystem I PsaE, reaction centre subunit IV / Photosystem I reaction centre subunit IV / PsaE / : / Photosystem I protein PsaC / Photosystem I PsaA / Photosystem I PsaB / Photosystem I PsaA/PsaB, conserved site / Photosystem I psaA and psaB proteins signature. / Photosystem I PsaA/PsaB / Photosystem I PsaA/PsaB superfamily / Photosystem I psaA/psaB protein / Electron transport accessory-like domain superfamily / 4Fe-4S dicluster domain / 4Fe-4S ferredoxin, iron-sulphur binding, conserved site / 4Fe-4S ferredoxin-type iron-sulfur binding region signature. / 4Fe-4S ferredoxin-type iron-sulfur binding domain profile. / 4Fe-4S ferredoxin-type, iron-sulphur binding domain
Similarity search - Domain/homology
BETA-CAROTENE / CHLOROPHYLL B / CHLOROPHYLL A ISOMER / CHLOROPHYLL A / DIGALACTOSYL DIACYL GLYCEROL (DGDG) / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE / Chem-LUT / Chem-NEX / PHYLLOQUINONE ...BETA-CAROTENE / CHLOROPHYLL B / CHLOROPHYLL A ISOMER / CHLOROPHYLL A / DIGALACTOSYL DIACYL GLYCEROL (DGDG) / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE / Chem-LUT / Chem-NEX / PHYLLOQUINONE / IRON/SULFUR CLUSTER / Chem-XAT / Photosystem I reaction center subunit VIII / PSI subunit V / Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Photosystem I P700 chlorophyll a apoprotein A2 / Photosystem I P700 chlorophyll a apoprotein A1 / Photosystem I reaction center subunit IV, chloroplastic / Photosystem I reaction center subunit III, chloroplastic / Photosystem I reaction center subunit V, chloroplastic / Photosystem I reaction center subunit psaK, chloroplastic / Photosystem I reaction center subunit IX / Photosystem I iron-sulfur center / Chlorophyll a-b binding protein, chloroplastic / Photosystem I reaction center subunit II, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein, chloroplastic / Chlorophyll a-b binding protein, chloroplastic
Similarity search - Component
Biological speciesChlamydomonas reinhardtii (plant)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.74 Å
AuthorsNaschberger, A. / Amunts, A.
Funding support Sweden, Germany, 4items
OrganizationGrant numberCountry
The Swedish Foundation for Strategic ResearchARC19-0051 Sweden
Knut and Alice Wallenberg Foundation2018.0080 Sweden
German Federal Ministry for Education and ResearchNRW 28 313-WO44A Germany
German-Israeli Foundation for Research and DevelopmentG-1483- 207/2018 Germany
CitationJournal: Nat Plants / Year: 2022
Title: Algal photosystem I dimer and high-resolution model of PSI-plastocyanin complex.
Authors: Andreas Naschberger / Laura Mosebach / Victor Tobiasson / Sebastian Kuhlgert / Martin Scholz / Annemarie Perez-Boerema / Thi Thu Hoai Ho / André Vidal-Meireles / Yuichiro Takahashi / ...Authors: Andreas Naschberger / Laura Mosebach / Victor Tobiasson / Sebastian Kuhlgert / Martin Scholz / Annemarie Perez-Boerema / Thi Thu Hoai Ho / André Vidal-Meireles / Yuichiro Takahashi / Michael Hippler / Alexey Amunts /
Abstract: Photosystem I (PSI) enables photo-electron transfer and regulates photosynthesis in the bioenergetic membranes of cyanobacteria and chloroplasts. Being a multi-subunit complex, its macromolecular ...Photosystem I (PSI) enables photo-electron transfer and regulates photosynthesis in the bioenergetic membranes of cyanobacteria and chloroplasts. Being a multi-subunit complex, its macromolecular organization affects the dynamics of photosynthetic membranes. Here we reveal a chloroplast PSI from the green alga Chlamydomonas reinhardtii that is organized as a homodimer, comprising 40 protein subunits with 118 transmembrane helices that provide scaffold for 568 pigments. Cryogenic electron microscopy identified that the absence of PsaH and Lhca2 gives rise to a head-to-head relative orientation of the PSI-light-harvesting complex I monomers in a way that is essentially different from the oligomer formation in cyanobacteria. The light-harvesting protein Lhca9 is the key element for mediating this dimerization. The interface between the monomers is lacking PsaH and thus partially overlaps with the surface area that would bind one of the light-harvesting complex II complexes in state transitions. We also define the most accurate available PSI-light-harvesting complex I model at 2.3 Å resolution, including a flexibly bound electron donor plastocyanin, and assign correct identities and orientations to all the pigments, as well as 621 water molecules that affect energy transfer pathways.
History
DepositionApr 29, 2022Deposition site: PDBE / Processing site: PDBE
Revision 1.0Nov 23, 2022Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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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 III, chloroplastic
G: Photosystem I reaction center subunit V, chloroplastic
I: Photosystem I reaction center subunit VIII
J: Photosystem I reaction center subunit IX
L: PSI subunit V
K: Photosystem I reaction center subunit psaK, chloroplastic
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 (Lhca4)
5: Chlorophyll a-b binding protein, chloroplastic
6: Chlorophyll a-b binding protein, chloroplastic
9: Chlorophyll a-b binding protein, chloroplastic
B2: Photosystem I P700 chlorophyll a apoprotein A2
I2: Photosystem I reaction center subunit VIII
L2: PSI subunit V
92: Chlorophyll a-b binding protein, chloroplastic
hetero molecules


Theoretical massNumber of molelcules
Total (without water)918,445421
Polymers605,25624
Non-polymers313,190397
Water1,58588
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Photosystem I P700 chlorophyll a apoprotein ... , 3 types, 3 molecules ABB2

#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 natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: P12154, photosystem I
#2: Protein Photosystem I P700 chlorophyll a apoprotein A2 / PSI-B / PsaB


Mass: 82184.266 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: P09144, photosystem I
#20: Protein Photosystem I P700 chlorophyll a apoprotein A2


Mass: 20637.457 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant)

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Protein , 2 types, 3 molecules CLL2

#3: Protein Photosystem I iron-sulfur center / 9 kDa polypeptide / PSI-C / Photosystem I subunit VII / PsaC


Mass: 8869.325 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: Q00914, photosystem I
#10: Protein PSI subunit V


Mass: 20300.539 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: A8IL32

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Photosystem I reaction center subunit ... , 7 types, 8 molecules DEFGII2JK

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


Mass: 21372.887 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: Q39615
#5: Protein Photosystem I reaction center subunit IV, chloroplastic / PSI-E / P30 protein / Photosystem I 8.1 kDa protein


Mass: 10786.395 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: P12352
#6: Protein Photosystem I reaction center subunit III, chloroplastic / Light-harvesting complex I 17 kDa protein / P21 protein / PSI-F


Mass: 24088.936 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: P12356
#7: Protein Photosystem I reaction center subunit V, chloroplastic / Light-harvesting complex I 10 kDa protein / P35 protein / PSI-G


Mass: 13236.007 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: P14224
#8: Protein Photosystem I reaction center subunit VIII


Mass: 10586.388 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: A8IFG7
#9: Protein/peptide Photosystem I reaction center subunit IX / PSI-J


Mass: 4645.372 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: P59777
#11: Protein Photosystem I reaction center subunit psaK, chloroplastic / Light-harvesting complex I 8.4 kDa protein / P37 protein / PSI-K / Photosystem I subunit X


Mass: 11214.084 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: P14225

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Chlorophyll a-b binding protein, ... , 8 types, 10 molecules 1Z378456992

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


Mass: 23923.205 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: Q05093
#13: Protein Chlorophyll a-b binding protein, chloroplastic


Mass: 32629.486 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: A8JF10
#14: Protein Chlorophyll a-b binding protein, chloroplastic


Mass: 26248.869 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: Q84Y02
#15: Protein Chlorophyll a-b binding protein, chloroplastic


Mass: 25948.812 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: Q75VY7
#16: Protein Chlorophyll a-b binding protein, chloroplastic (Lhca4)


Mass: 28729.822 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: Q75VZ0
#17: Protein Chlorophyll a-b binding protein, chloroplastic


Mass: 28257.555 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: Q75VY8
#18: Protein Chlorophyll a-b binding protein, chloroplastic


Mass: 27812.373 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: Q75VY6
#19: Protein Chlorophyll a-b binding protein, chloroplastic


Mass: 22867.277 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Chlamydomonas reinhardtii (plant) / References: UniProt: A8ITV3

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Sugars , 2 types, 35 molecules

#27: Sugar...
ChemComp-LMU / DODECYL-ALPHA-D-MALTOSIDE


Type: D-saccharide / Mass: 510.615 Da / Num. of mol.: 34 / Source method: obtained synthetically / Formula: C24H46O11 / Feature type: SUBJECT OF INVESTIGATION / Comment: detergent*YM
#30: Sugar ChemComp-DGD / DIGALACTOSYL DIACYL GLYCEROL (DGDG)


Type: saccharide / Mass: 949.299 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C51H96O15 / Feature type: SUBJECT OF INVESTIGATION

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Non-polymers , 12 types, 450 molecules

#21: Chemical ChemComp-CL0 / CHLOROPHYLL A ISOMER


Mass: 893.489 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C55H72MgN4O5 / Feature type: SUBJECT OF INVESTIGATION
#22: Chemical...
ChemComp-CLA / CHLOROPHYLL A


Mass: 893.489 Da / Num. of mol.: 226 / Source method: obtained synthetically / Formula: C55H72MgN4O5 / Feature type: SUBJECT OF INVESTIGATION
#23: Chemical ChemComp-PQN / PHYLLOQUINONE / VITAMIN K1 / 2-METHYL-3-PHYTYL-1,4-NAPHTHOQUINONE


Mass: 450.696 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C31H46O2 / Feature type: SUBJECT OF INVESTIGATION
#24: Chemical
ChemComp-LHG / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE


Mass: 722.970 Da / Num. of mol.: 16 / Source method: obtained synthetically / Formula: C38H75O10P / Feature type: SUBJECT OF INVESTIGATION / Comment: phospholipid*YM
#25: Chemical...
ChemComp-BCR / BETA-CAROTENE


Mass: 536.873 Da / Num. of mol.: 36 / Source method: obtained synthetically / Formula: C40H56 / Feature type: SUBJECT OF INVESTIGATION
#26: Chemical ChemComp-SF4 / IRON/SULFUR CLUSTER


Mass: 351.640 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: Fe4S4 / Feature type: SUBJECT OF INVESTIGATION
#28: Chemical
ChemComp-LMG / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE


Mass: 787.158 Da / Num. of mol.: 17 / Source method: obtained synthetically / Formula: C45H86O10 / Feature type: SUBJECT OF INVESTIGATION
#29: 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


Mass: 568.871 Da / Num. of mol.: 20 / Source method: obtained synthetically / Formula: C40H56O2 / Feature type: SUBJECT OF INVESTIGATION
#31: Chemical...
ChemComp-CHL / CHLOROPHYLL B


Mass: 907.472 Da / Num. of mol.: 32 / Source method: obtained synthetically / Formula: C55H70MgN4O6
#32: Chemical
ChemComp-XAT / (3S,5R,6S,3'S,5'R,6'S)-5,6,5',6'-DIEPOXY-5,6,5',6'- TETRAHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL / VIOLAXANTHIN


Mass: 600.870 Da / Num. of mol.: 7 / Source method: obtained synthetically / Formula: C40H56O4 / Feature type: SUBJECT OF INVESTIGATION
#33: Chemical ChemComp-NEX / (1R,3R)-6-{(3E,5E,7E,9E,11E,13E,15E,17E)-18-[(1S,4R,6R)-4-HYDROXY-2,2,6-TRIMETHYL-7-OXABICYCLO[4.1.0]HEPT-1-YL]-3,7,12,16-TETRAMETHYLOCTADECA-1,3,5,7,9,11,13,15,17-NONAENYLIDENE}-1,5,5-TRIMETHYLCYCLOHEXANE-1,3-DIOL / (3S,5R,6R,3'S,5'R,6'S)-5',6'-EPOXY-6,7-DIDEHYDRO- 5,6,5',6'-TETRAHYDRO-BETA,BETA-CAROTENE-3,5,3'-TRIOL / 9'-CIS-NEOXANTHIN


Mass: 600.870 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C40H56O4 / Feature type: SUBJECT OF INVESTIGATION
#34: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 88 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY

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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 dimer of Chlamydomonas reinhardtii / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1-#20 / Source: NATURAL
Molecular weightValue: 0.7 MDa / Experimental value: YES
Source (natural)Organism: Chlamydomonas reinhardtii (plant)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
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 FIELD / Nominal defocus max: 5000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 45.8 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 2.74 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 28346 / Symmetry type: POINT

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