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- PDB-9yl7: Structure of photosystem I with plastoquinone-9 bound -

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Basic information

Entry
Database: PDB / ID: 9yl7
TitleStructure of photosystem I with plastoquinone-9 bound
Components
  • (Photosystem I P700 chlorophyll a apoprotein ...) x 2
  • (Photosystem I reaction center subunit ...) x 8
  • Photosystem I iron-sulfur center
KeywordsPHOTOSYNTHESIS / photosystem I / quinones / electron transfer / partial occupancy
Function / homology
Function and homology information


photosystem I reaction center / photosystem I / photosynthetic electron transport in photosystem I / photosystem I / plasma membrane-derived thylakoid membrane / photosynthesis / 4 iron, 4 sulfur cluster binding / electron transfer activity / magnesium ion binding / plasma membrane
Similarity search - Function
Photosystem I reaction center subunit PsaK / Photosystem I reaction centre subunit PsaK / Photosystem I reaction centre subunit PsaK superfamily / Photosystem I PsaM, reaction centre superfamily / Photosystem I PsaM, reaction centre / Photosystem I protein M (PsaM) / 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 center subunit PsaK / Photosystem I reaction centre subunit PsaK / Photosystem I reaction centre subunit PsaK superfamily / Photosystem I PsaM, reaction centre superfamily / Photosystem I PsaM, reaction centre / Photosystem I protein M (PsaM) / 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 / Photosystem I PsaD / Photosystem I, reaction centre subunit PsaD superfamily / PsaD / Photosystem I PsaE, reaction centre subunit IV / Photosystem I reaction centre subunit IV / PsaE / Photosystem I PsaJ, reaction centre subunit IX superfamily / Photosystem I PsaJ, reaction centre subunit IX / Photosystem I reaction centre subunit IX / PsaJ / 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,beta-carotene-4,4'-dione / : / BETA-CAROTENE / CHLOROPHYLL A ISOMER / CHLOROPHYLL A / DIGALACTOSYL DIACYL GLYCEROL (DGDG) / beta,beta-caroten-4-one / (3'R)-3'-hydroxy-beta,beta-caroten-4-one / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE ...beta,beta-carotene-4,4'-dione / : / BETA-CAROTENE / CHLOROPHYLL A ISOMER / CHLOROPHYLL A / DIGALACTOSYL DIACYL GLYCEROL (DGDG) / beta,beta-caroten-4-one / (3'R)-3'-hydroxy-beta,beta-caroten-4-one / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE / Chem-PL9 / IRON/SULFUR CLUSTER / Chem-SQD / Photosystem I reaction center subunit IV / Photosystem I reaction center subunit II / Photosystem I P700 chlorophyll a apoprotein A1 / Photosystem I P700 chlorophyll a apoprotein A2 / Photosystem I reaction center subunit III / Photosystem I iron-sulfur center / Photosystem I reaction center subunit XI / Photosystem I reaction center subunit PsaK 1 / Photosystem I reaction center subunit XII / Photosystem I reaction center subunit IX / Photosystem I reaction center subunit VIII
Similarity search - Component
Biological speciesSynechocystis sp. PCC 6803 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 1.68 Å
AuthorsBrininger, C.M. / Gisriel, C.J.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R00GM140174 United States
CitationJournal: To Be Published
Title: Structure of photosystem I with plastoquinone-9 bound
Authors: Brininger, C.M. / Gisriel, C.J.
History
DepositionOct 8, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Oct 14, 2026Provider: repository / Type: Initial release
Revision 1.0Oct 14, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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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
E: Photosystem I reaction center subunit IV
F: Photosystem I reaction center subunit III
I: Photosystem I reaction center subunit VIII
J: Photosystem I reaction center subunit IX
K: Photosystem I reaction center subunit PsaK 1
L: Photosystem I reaction center subunit XI
M: Photosystem I reaction center subunit XII
hetero molecules


Theoretical massNumber of molelcules
Total (without water)364,574155
Polymers252,94811
Non-polymers111,626144
Water14,286793
1


  • Idetical with deposited unit
  • defined by author
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 / PsaA


Mass: 83036.398 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P29254, photosystem I
#2: Protein Photosystem I P700 chlorophyll a apoprotein A2 / PsaB


Mass: 81369.531 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P29255, photosystem I

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Protein , 1 types, 1 molecules C

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


Mass: 8837.261 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P32422, photosystem I

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

#4: Protein Photosystem I reaction center subunit II / Photosystem I 16 kDa polypeptide / PSI-D


Mass: 15663.749 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P19569
#5: Protein Photosystem I reaction center subunit IV / Photosystem I 8.1 kDa protein / p30 protein


Mass: 8154.086 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P12975
#6: Protein Photosystem I reaction center subunit III / PSI-F


Mass: 18267.082 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P29256
#7: Protein/peptide Photosystem I reaction center subunit VIII


Mass: 4414.148 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: Q55330
#8: Protein/peptide Photosystem I reaction center subunit IX


Mass: 4535.415 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: Q55329
#9: Protein Photosystem I reaction center subunit PsaK 1 / Photosystem I subunit X 1


Mass: 8656.258 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P72712
#10: Protein Photosystem I reaction center subunit XI / PSI subunit V / PSI-L


Mass: 16631.795 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P37277
#11: Protein/peptide Photosystem I reaction center subunit XII / PSI-M


Mass: 3382.063 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: P72986

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Sugars , 2 types, 9 molecules

#18: Sugar
ChemComp-LMT / DODECYL-BETA-D-MALTOSIDE


Type: D-saccharide / Mass: 510.615 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: C24H46O11 / Comment: detergent*YM
#26: Sugar ChemComp-DGD / DIGALACTOSYL DIACYL GLYCEROL (DGDG)


Type: saccharide / Mass: 949.299 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C51H96O15

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Non-polymers , 15 types, 928 molecules

#12: Chemical...
ChemComp-CLA / CHLOROPHYLL A


Mass: 893.489 Da / Num. of mol.: 95 / Source method: obtained synthetically / Formula: C55H72MgN4O5
#13: Chemical ChemComp-CL0 / CHLOROPHYLL A ISOMER


Mass: 893.489 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C55H72MgN4O5
#14: Chemical ChemComp-SF4 / IRON/SULFUR CLUSTER


Mass: 351.640 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: Fe4S4
#15: Chemical
ChemComp-BCR / BETA-CAROTENE


Mass: 536.873 Da / Num. of mol.: 19 / Source method: obtained synthetically / Formula: C40H56
#16: Chemical
ChemComp-LHG / 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE


Mass: 722.970 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C38H75O10P / Comment: phospholipid*YM
#17: Chemical ChemComp-LMG / 1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE


Mass: 787.158 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C45H86O10
#19: Chemical ChemComp-PL9 / 2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE / PLASTOQUINONE 9


Mass: 749.201 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C53H80O2 / Feature type: SUBJECT OF INVESTIGATION
#20: Chemical ChemComp-45D / beta,beta-carotene-4,4'-dione / Isomer of Canthaxanthin


Mass: 564.840 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C40H52O2
#21: Chemical ChemComp-CL / CHLORIDE ION


Mass: 35.453 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Cl
#22: Chemical ChemComp-A1AGD / 2,3-dimethyl-5-[(2E,7R,11R)-3,7,11,15-tetramethylhexadec-2-en-1-yl]cyclohexa-2,5-diene-1,4-dione


Mass: 414.664 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C28H46O2
#23: Chemical ChemComp-ECH / beta,beta-caroten-4-one / echinenone


Mass: 550.856 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C40H54O
#24: Chemical ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Ca
#25: Chemical ChemComp-EQ3 / (3'R)-3'-hydroxy-beta,beta-caroten-4-one / 3'-Hydroxyechinenone / 3'-OH-Echinenone


Mass: 566.856 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C40H54O2
#27: Chemical ChemComp-SQD / 1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL / SULFOQUINOVOSYLDIACYLGLYCEROL


Mass: 795.116 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C41H78O12S
#28: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 793 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
Has protein modificationY

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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 from menB variant of Synechocystis sp. PCC 6803
Type: COMPLEX / Entity ID: #1-#11 / Source: NATURAL
Source (natural)Organism: Synechocystis sp. PCC 6803 (bacteria)
Buffer solutionpH: 6.5
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2PHENIX"2.1_6048"model refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 1.68 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1243569 / Symmetry type: POINT

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