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- PDB-7dxh: Cryo-EM structure of PSII intermediate Psb28-PSII complex -

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Basic information

Entry
Database: PDB / ID: 7dxh
TitleCryo-EM structure of PSII intermediate Psb28-PSII complex
Components
  • (Cytochrome b559 subunit ...) x 2
  • (Photosystem II ...) x 14
  • Tsl0063 protein
  • unidentified transmembrane protein
KeywordsPLANT PROTEIN / Photosystem II / Cryo-EM / assembly / repair / Psb28 / Tsl0063
Function / homology
Function and homology information


photosystem II oxygen evolving complex / oxygen evolving activity / photosystem II stabilization / photosystem II reaction center / photosystem II / oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor / photosynthetic electron transport chain / photosystem II / response to herbicide / chlorophyll binding ...photosystem II oxygen evolving complex / oxygen evolving activity / photosystem II stabilization / photosystem II reaction center / photosystem II / oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor / photosynthetic electron transport chain / photosystem II / response to herbicide / chlorophyll binding / plasma membrane-derived thylakoid membrane / photosynthetic electron transport in photosystem II / : / phosphate ion binding / photosynthesis, light reaction / photosynthesis / electron transfer activity / protein stabilization / iron ion binding / heme binding / metal ion binding
Similarity search - Function
: / Photosystem II Psb28, class 1 / Photosystem II Psb28, class 1 superfamily / Psb28 protein / Photosystem II PsbX, type 1 subfamily / Photosystem II reaction centre protein Ycf12 / Photosystem II complex subunit Ycf12 / Photosystem II reaction centre M protein (PsbM) / Photosystem II PsbM superfamily / Photosystem II PsbM ...: / Photosystem II Psb28, class 1 / Photosystem II Psb28, class 1 superfamily / Psb28 protein / Photosystem II PsbX, type 1 subfamily / Photosystem II reaction centre protein Ycf12 / Photosystem II complex subunit Ycf12 / Photosystem II reaction centre M protein (PsbM) / Photosystem II PsbM superfamily / Photosystem II PsbM / Photosystem II PsbZ, reaction centre / Photosystem II PsbZ superfamily / YCF9 / Photosystem II PsbX / Photosystem II reaction centre X protein (PsbX) / Photosystem II PsbT / Photosystem II PsbL / Photosystem II PsbL superfamily / Photosystem II PsbT superfamily / Photosystem II reaction centre T protein / PsbL protein / Photosystem II PsbK / Photosystem II CP43 reaction centre protein / Photosystem II PsbK superfamily / Photosystem II CP43 reaction centre protein superfamily / Photosystem II 4 kDa reaction centre component / Photosystem II PsbI / Photosystem II CP47 reaction centre protein / Photosystem II PsbI superfamily / Photosystem II reaction centre I protein (PSII 4.8 kDa protein) / Photosystem II reaction centre protein H / Photosystem II reaction centre protein H superfamily / Photosystem II 10 kDa phosphoprotein / Photosystem II protein D1 / Photosystem II D2 protein / Photosystem II cytochrome b559, conserved site / Photosystem II cytochrome b559, alpha subunit / Photosystem II cytochrome b559, beta subunit / Photosystem II cytochrome b559, N-terminal / Photosystem II cytochrome b559, alpha subunit, lumenal region / Photosystem II cytochrome b559, alpha subunit superfamily / Cytochrome b559, alpha (gene psbE) and beta (gene psbF)subunits / Lumenal portion of Cytochrome b559, alpha (gene psbE) subunit / Cytochrome b559 subunits heme-binding site signature. / : / Photosystem antenna protein-like / Photosystem antenna protein-like superfamily / Photosystem II protein / : / Photosynthetic reaction centre, L/M / Photosystem II protein D1/D2 superfamily / Photosynthetic reaction centre protein / Photosynthetic reaction center proteins signature.
Similarity search - Domain/homology
BETA-CAROTENE / CHLOROPHYLL A / DIGALACTOSYL DIACYL GLYCEROL (DGDG) / : / PROTOPORPHYRIN IX CONTAINING FE / Chem-MGE / PHEOPHYTIN A / Chem-PQ9 / Chem-SQD / Unknown ligand ...BETA-CAROTENE / CHLOROPHYLL A / DIGALACTOSYL DIACYL GLYCEROL (DGDG) / : / PROTOPORPHYRIN IX CONTAINING FE / Chem-MGE / PHEOPHYTIN A / Chem-PQ9 / Chem-SQD / Unknown ligand / Photosystem II CP47 reaction center protein / Photosystem II reaction center protein Psb30 / Photosystem II reaction center protein X / Photosystem II reaction center protein Z / Photosystem II CP43 reaction center protein / Photosystem II D2 protein / Cytochrome b559 subunit alpha / Cytochrome b559 subunit beta / Photosystem II reaction center protein I / Photosystem II reaction center protein L / Photosystem II reaction center protein M / Photosystem II reaction center protein T / Photosystem II reaction center protein H / Photosystem II protein D1 / Photosystem II assembly factor Psb28 protein / Photosystem II assembly protein Psb34 / Photosystem II reaction center protein K
Similarity search - Component
Biological speciesThermosynechococcus vulcanus (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.14 Å
AuthorsSui, S.F. / Shen, J.R. / Han, G.Y. / Xiao, Y.N. / Huang, G.Q.
CitationJournal: Nat Plants / Year: 2021
Title: Structural insights into cyanobacterial photosystem II intermediates associated with Psb28 and Tsl0063.
Authors: Yanan Xiao / Guoqiang Huang / Xin You / Qingjun Zhu / Wenda Wang / Tingyun Kuang / Guangye Han / Sen-Fang Sui / Jian-Ren Shen /
Abstract: Photosystem II (PSII) is a multisubunit pigment-protein complex and catalyses light-induced water oxidation, leading to the conversion of light energy into chemical energy and the release of dioxygen. ...Photosystem II (PSII) is a multisubunit pigment-protein complex and catalyses light-induced water oxidation, leading to the conversion of light energy into chemical energy and the release of dioxygen. We analysed the structures of two Psb28-bound PSII intermediates, Psb28-RC47 and Psb28-PSII, purified from a psbV-deletion strain of the thermophilic cyanobacterium Thermosynechococcus vulcanus, using cryo-electron microscopy. Both Psb28-RC47 and Psb28-PSII bind one Psb28, one Tsl0063 and an unknown subunit. Psb28 is located at the cytoplasmic surface of PSII and interacts with D1, D2 and CP47, whereas Tsl0063 is a transmembrane subunit and binds at the side of CP47/PsbH. Substantial structural perturbations are observed at the acceptor side, which result in conformational changes of the quinone (Q) and non-haem iron binding sites and thus may protect PSII from photodamage during assembly. These results provide a solid structural basis for understanding the assembly process of native PSII.
History
DepositionJan 18, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jun 30, 2021Provider: repository / Type: Initial release
Revision 1.0Jun 30, 2021Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.0Jun 30, 2021Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 2.0Apr 6, 2022Group: Data collection / Database references / Non-polymer description
Category: chem_comp / citation ...chem_comp / citation / citation_author / database_2 / pdbx_validate_chiral
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Revision 2.1Jun 5, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond
Revision 2.2Jul 2, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details
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Revision 1.1Jul 2, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Assembly

Deposited unit
A: Photosystem II reaction center Psb28 protein
B: Tsl0063 protein
a: Photosystem II protein D1
b: Photosystem II CP47 reaction center protein
d: Photosystem II D2 protein
e: Cytochrome b559 subunit alpha
f: Cytochrome b559 subunit beta
h: Photosystem II reaction center protein H
i: Photosystem II reaction center protein I
l: Photosystem II reaction center protein L
m: Photosystem II reaction center protein M
t: Photosystem II reaction center protein T
x: Photosystem II reaction center protein X
c: Photosystem II CP43 reaction center protein
k: Photosystem II reaction center protein K
z: Photosystem II reaction center protein Z
y: Photosystem II reaction center protein Ycf12
C: unidentified transmembrane protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)312,88787
Polymers261,95218
Non-polymers50,93469
Water00
1


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

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Components

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Photosystem II ... , 14 types, 14 molecules Aabdhilmtxckzy

#1: Protein Photosystem II reaction center Psb28 protein


Mass: 13188.769 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: Q8DLJ8
#3: Protein Photosystem II protein D1 / PSII D1 protein / Photosystem II Q(B) protein


Mass: 39792.367 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: P51765
#4: Protein Photosystem II CP47 reaction center protein / PSII 47 kDa protein / Protein CP-47


Mass: 56068.742 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: D0VWR1
#5: Protein Photosystem II D2 protein / PSII D2 protein / Photosystem Q(A) protein


Mass: 38404.949 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: D0VWR8
#8: Protein Photosystem II reaction center protein H / PSII-H


Mass: 7227.559 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: P19052
#9: Protein/peptide Photosystem II reaction center protein I / PSII-I / PSII 4.4 kDa protein


Mass: 4410.245 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: P12240
#10: Protein/peptide Photosystem II reaction center protein L / PSII-L


Mass: 4299.044 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: P12241
#11: Protein/peptide Photosystem II reaction center protein M / PSII-M


Mass: 4015.688 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: P12312
#12: Protein/peptide Photosystem II reaction center protein T / PSII-T / PSII-Tc


Mass: 3878.728 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: P12313
#13: Protein/peptide Photosystem II reaction center protein X


Mass: 4191.030 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: D0VWR4
#14: Protein Photosystem II CP43 reaction center protein / PSII 43 kDa protein / Protein CP-43


Mass: 49207.250 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: D0VWR7
#15: Protein/peptide Photosystem II reaction center protein K


Mass: 5028.083 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: Q9F1K9
#16: Protein Photosystem II reaction center protein Z / PSII-Z


Mass: 6766.187 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: D0VWR5
#17: Protein/peptide Photosystem II reaction center protein Ycf12


Mass: 3228.035 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: D0VWR3

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Cytochrome b559 subunit ... , 2 types, 2 molecules ef

#6: Protein Cytochrome b559 subunit alpha / PSII reaction center subunit V


Mass: 9580.840 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: P12238
#7: Protein/peptide Cytochrome b559 subunit beta / PSII reaction center subunit VI


Mass: 5067.900 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: P12239

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Protein / Protein/peptide , 2 types, 2 molecules BC

#18: Protein/peptide unidentified transmembrane protein


Mass: 1652.805 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria)
#2: Protein Tsl0063 protein


Mass: 5943.893 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermosynechococcus vulcanus (bacteria) / References: UniProt: Q8DMP8

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Sugars , 3 types, 8 molecules

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


Type: saccharide / Mass: 949.299 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C51H96O15
#26: Sugar ChemComp-LMT / DODECYL-BETA-D-MALTOSIDE


Type: D-saccharide / Mass: 510.615 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C24H46O11 / Comment: detergent*YM
#31: Sugar ChemComp-HTG / heptyl 1-thio-beta-D-glucopyranoside / HEPTYL 1-THIOHEXOPYRANOSIDE / heptyl 1-thio-beta-D-glucoside / heptyl 1-thio-D-glucoside / heptyl 1-thio-glucoside


Type: D-saccharide / Mass: 294.408 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C13H26O5S / Comment: detergent*YM

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Non-polymers , 10 types, 61 molecules

#19: Chemical
ChemComp-MGE / (1S)-2-(ALPHA-L-ALLOPYRANOSYLOXY)-1-[(TRIDECANOYLOXY)METHYL]ETHYL PALMITATE / MONOGALACTOSYL-DIACYLGLYCEROL


Mass: 688.972 Da / Num. of mol.: 7 / Source method: obtained synthetically / Formula: C38H72O10
#20: 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.: 2 / Source method: obtained synthetically / Formula: C41H78O12S
#21: Chemical...
ChemComp-CLA / CHLOROPHYLL A


Mass: 893.489 Da / Num. of mol.: 34 / Source method: obtained synthetically / Formula: C55H72MgN4O5
#22: Chemical
ChemComp-BCR / BETA-CAROTENE


Mass: 536.873 Da / Num. of mol.: 9 / Source method: obtained synthetically / Formula: C40H56
#23: Chemical ChemComp-CL / CHLORIDE ION


Mass: 35.453 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Cl
#25: Chemical ChemComp-PHO / PHEOPHYTIN A


Mass: 871.200 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C55H74N4O5
#27: Chemical ChemComp-FE2 / FE (II) ION


Mass: 55.845 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Fe
#28: Chemical ChemComp-PQ9 / 5-[(2E,6E,10E,14E,18E,22E)-3,7,11,15,19,23,27-HEPTAMETHYLOCTACOSA-2,6,10,14,18,22,26-HEPTAENYL]-2,3-DIMETHYLBENZO-1,4-QUINONE


Mass: 612.967 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C43H64O2
#29: Chemical ChemComp-UNL / UNKNOWN LIGAND


Mass: 294.408 Da / Num. of mol.: 2 / Source method: obtained synthetically
#30: Chemical ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C34H32FeN4O4

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Details

Has ligand of interestN
Has protein modificationN

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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: Cryo-EM structure of PSII intermediate Psb28-PSII complex.
Type: COMPLEX / Entity ID: #1-#11, #13-#18 / Source: NATURAL
Source (natural)Organism: Thermosynechococcus vulcanus (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: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.14 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 194738 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.01121018
ELECTRON MICROSCOPYf_angle_d3.8629054
ELECTRON MICROSCOPYf_dihedral_angle_d27.5764277
ELECTRON MICROSCOPYf_chiral_restr0.1092970
ELECTRON MICROSCOPYf_plane_restr0.0113470

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