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- PDB-7zxy: 3.15 Angstrom cryo-EM structure of the dimeric cytochrome b6f com... -

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Entry
Database: PDB / ID: 7zxy
Title3.15 Angstrom cryo-EM structure of the dimeric cytochrome b6f complex from Synechocystis sp. PCC 6803 with natively bound plastoquinone and lipid molecules.
Components
  • (Cytochrome b6-f complex subunit ...) x 4
  • Cytochrome B6
  • Cytochrome b6
  • Cytochrome b6-f complex iron-sulfur subunit 2
  • Cytochrome f
KeywordsOXIDOREDUCTASE / cytochrome bc complexes / electron transfer / cytochrome b6f / photosynthesis / cyanobacteria
Function / homology
Function and homology information


cytochrome b6f complex / plastoquinol-plastocyanin reductase / plastoquinol--plastocyanin reductase activity / electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity / cytochrome complex assembly / photosynthetic electron transport chain / plasma membrane-derived thylakoid membrane / electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity / membrane => GO:0016020 / photosynthesis ...cytochrome b6f complex / plastoquinol-plastocyanin reductase / plastoquinol--plastocyanin reductase activity / electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity / cytochrome complex assembly / photosynthetic electron transport chain / plasma membrane-derived thylakoid membrane / electron transporter, transferring electrons within the cyclic electron transport pathway of photosynthesis activity / membrane => GO:0016020 / photosynthesis / respiratory electron transport chain / proton transmembrane transport / 2 iron, 2 sulfur cluster binding / electron transfer activity / oxidoreductase activity / iron ion binding / heme binding / membrane / metal ion binding / plasma membrane
Similarity search - Function
Cytochrome b6-f complex iron-sulfur subunit / Cytochrome b6/f complex, subunit 5 / Cytochrome b6-f complex, subunit 8 / Cytochrome b6/f complex, subunit IV / PetM of cytochrome b6/f complex subunit 7 / Cytochrome b6, PetB / Cytochrome b6/f complex, subunit 5 superfamily / Cytochrome b6-f complex, subunit 8 superfamily / Cytochrome B6-F complex subunit 5 / PetN ...Cytochrome b6-f complex iron-sulfur subunit / Cytochrome b6/f complex, subunit 5 / Cytochrome b6-f complex, subunit 8 / Cytochrome b6/f complex, subunit IV / PetM of cytochrome b6/f complex subunit 7 / Cytochrome b6, PetB / Cytochrome b6/f complex, subunit 5 superfamily / Cytochrome b6-f complex, subunit 8 superfamily / Cytochrome B6-F complex subunit 5 / PetN / PetM family of cytochrome b6f complex subunit 7 / Cytochrome f transmembrane anchor / Cytochrome f / Cytochrome f large domain / Cytochrome f large domain superfamily / Apocytochrome F, C-terminal / Apocytochrome F, N-terminal / Cytochrome f family profile. / : / : / Cytochrome b/b6, C-terminal / Cytochrome b(C-terminal)/b6/petD / Cytochrome b/b6 C-terminal region profile. / Cytochrome b/b6, C-terminal domain superfamily / Cytochrome b/b6/petB / Rieske iron-sulphur protein, C-terminal / Cytochrome b/b6, N-terminal / Cytochrome b/b6-like domain superfamily / Cytochrome b/b6 N-terminal region profile. / Di-haem cytochrome, transmembrane / Rudiment single hybrid motif / Rieske iron-sulphur protein / Rieske [2Fe-2S] domain / Rieske [2Fe-2S] iron-sulphur domain / Rieske [2Fe-2S] iron-sulfur domain profile. / Rieske [2Fe-2S] iron-sulphur domain superfamily / Cyclic nucleotide-binding domain
Similarity search - Domain/homology
CHLOROPHYLL A / beta,beta-caroten-4-one / FE2/S2 (INORGANIC) CLUSTER / HEME C / PROTOPORPHYRIN IX CONTAINING FE / EICOSANE / Chem-PGV / Cytochrome B6 / Cytochrome f / Cytochrome b6-f complex iron-sulfur subunit 2 ...CHLOROPHYLL A / beta,beta-caroten-4-one / FE2/S2 (INORGANIC) CLUSTER / HEME C / PROTOPORPHYRIN IX CONTAINING FE / EICOSANE / Chem-PGV / Cytochrome B6 / Cytochrome f / Cytochrome b6-f complex iron-sulfur subunit 2 / Cytochrome b6-f complex subunit 4 / Cytochrome b6-f complex subunit 8 / Cytochrome b6-f complex subunit 5 / Cytochrome b6-f complex subunit 7 / Cytochrome b6
Similarity search - Component
Biological speciesSynechocystis sp. PCC 6803 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.15 Å
AuthorsMalone, L.A. / Procter, M.S. / Farmer, D.F. / Swainsbury, D.J.K. / Hawkings, F.R. / Pastorelli, F. / Emrich-Mills, T.Z. / Siebert, A. / Hunter, C.N. / Hitchcock, A. / Johnson, M.P.
Funding support United Kingdom, 3items
OrganizationGrant numberCountry
Biotechnology and Biological Sciences Research Council (BBSRC)BB/M011151/1 United Kingdom
Biotechnology and Biological Sciences Research Council (BBSRC)BB/V006630/1 United Kingdom
Leverhulme TrustRPG-2019-045 United Kingdom
CitationJournal: Biochem J / Year: 2022
Title: Cryo-EM structures of the Synechocystis sp. PCC 6803 cytochrome b6f complex with and without the regulatory PetP subunit.
Authors: Matthew S Proctor / Lorna A Malone / David A Farmer / David J K Swainsbury / Frederick R Hawkings / Federica Pastorelli / Thomas Z Emrich-Mills / C Alistair Siebert / C Neil Hunter / Matthew ...Authors: Matthew S Proctor / Lorna A Malone / David A Farmer / David J K Swainsbury / Frederick R Hawkings / Federica Pastorelli / Thomas Z Emrich-Mills / C Alistair Siebert / C Neil Hunter / Matthew P Johnson / Andrew Hitchcock /
Abstract: In oxygenic photosynthesis, the cytochrome b6f (cytb6f) complex links the linear electron transfer (LET) reactions occurring at photosystems I and II and generates a transmembrane proton gradient via ...In oxygenic photosynthesis, the cytochrome b6f (cytb6f) complex links the linear electron transfer (LET) reactions occurring at photosystems I and II and generates a transmembrane proton gradient via the Q-cycle. In addition to this central role in LET, cytb6f also participates in a range of processes including cyclic electron transfer (CET), state transitions and photosynthetic control. Many of the regulatory roles of cytb6f are facilitated by auxiliary proteins that differ depending upon the species, yet because of their weak and transient nature the structural details of these interactions remain unknown. An apparent key player in the regulatory balance between LET and CET in cyanobacteria is PetP, a ∼10 kDa protein that is also found in red algae but not in green algae and plants. Here, we used cryogenic electron microscopy to determine the structure of the Synechocystis sp. PCC 6803 cytb6f complex in the presence and absence of PetP. Our structures show that PetP interacts with the cytoplasmic side of cytb6f, displacing the C-terminus of the PetG subunit and shielding the C-terminus of cytochrome b6, which binds the heme cn cofactor that is suggested to mediate CET. The structures also highlight key differences in the mode of plastoquinone binding between cyanobacterial and plant cytb6f complexes, which we suggest may reflect the unique combination of photosynthetic and respiratory electron transfer in cyanobacterial thylakoid membranes. The structure of cytb6f from a model cyanobacterial species amenable to genetic engineering will enhance future site-directed mutagenesis studies of structure-function relationships in this crucial ET complex.
History
DepositionMay 23, 2022Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jul 6, 2022Provider: repository / Type: Initial release
Revision 1.1Jul 27, 2022Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Cytochrome b6
B: Cytochrome b6-f complex subunit 4
C: Cytochrome f
D: Cytochrome b6-f complex iron-sulfur subunit 2
E: Cytochrome B6
F: Cytochrome b6-f complex subunit 7
G: Cytochrome b6-f complex subunit 5
H: Cytochrome b6-f complex subunit 8
I: Cytochrome b6
J: Cytochrome b6-f complex subunit 4
K: Cytochrome f
L: Cytochrome b6-f complex iron-sulfur subunit 2
M: Cytochrome B6
N: Cytochrome b6-f complex subunit 7
O: Cytochrome b6-f complex subunit 5
P: Cytochrome b6-f complex subunit 8
hetero molecules


Theoretical massNumber of molelcules
Total (without water)227,29039
Polymers213,30216
Non-polymers13,98823
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, native gel electrophoresis, homology, gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 3 types, 6 molecules AICKDL

#1: Protein Cytochrome b6


Mass: 25075.533 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / Strain: PCC 6803 / Kazusa / References: UniProt: Q57038
#3: Protein Cytochrome f


Mass: 30512.734 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / Strain: PCC 6803 / Kazusa / References: UniProt: P26287
#4: Protein Cytochrome b6-f complex iron-sulfur subunit 2 / Plastohydroquinone:plastocyanin oxidoreductase iron-sulfur protein 2 / ISP 2 / RISP 2 / Rieske iron- ...Plastohydroquinone:plastocyanin oxidoreductase iron-sulfur protein 2 / ISP 2 / RISP 2 / Rieske iron-sulfur protein 2


Mass: 19012.287 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / Strain: PCC 6803 / Kazusa
References: UniProt: P26290, plastoquinol-plastocyanin reductase

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Cytochrome b6-f complex subunit ... , 4 types, 8 molecules BJFNGOHP

#2: Protein Cytochrome b6-f complex subunit 4 / 17 kDa polypeptide


Mass: 17455.783 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / Strain: PCC 6803 / Kazusa / References: UniProt: P27589
#6: Protein/peptide Cytochrome b6-f complex subunit 7 / Cytochrome b6-f complex subunit PetM / Cytochrome b6-f complex subunit VII


Mass: 3827.555 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / Strain: PCC 6803 / Kazusa / References: UniProt: P74810
#7: Protein/peptide Cytochrome b6-f complex subunit 5 / Cytochrome b6-f complex subunit PetG / Cytochrome b6-f complex subunit V


Mass: 4061.917 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / Strain: PCC 6803 / Kazusa / References: UniProt: P74149
#8: Protein/peptide Cytochrome b6-f complex subunit 8 / Cytochrome b6-f complex subunit PetN / Cytochrome b6-f complex subunit VIII


Mass: 3328.965 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / Strain: PCC 6803 / Kazusa / References: UniProt: P72717

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Protein/peptide , 1 types, 2 molecules EM

#5: Protein/peptide Cytochrome B6


Mass: 3376.149 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Synechocystis sp. PCC 6803 (bacteria) / References: UniProt: A0A6P1VG96

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Non-polymers , 7 types, 23 molecules

#9: Chemical ChemComp-ECH / beta,beta-caroten-4-one / echinenone


Mass: 550.856 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C40H54O
#10: Chemical
ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C34H32FeN4O4
#11: Chemical
ChemComp-HEC / HEME C


Mass: 618.503 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C34H34FeN4O4
#12: Chemical ChemComp-CLA / CHLOROPHYLL A


Mass: 893.489 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C55H72MgN4O5
#13: Chemical
ChemComp-PGV / (1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE / PHOSPHATIDYLGLYCEROL / 2-VACCENOYL-1-PALMITOYL-SN-GLYCEROL-3-PHOSPHOGLYCEROL


Mass: 749.007 Da / Num. of mol.: 7 / Source method: obtained synthetically / Formula: C40H77O10P / Comment: phospholipid*YM
#14: Chemical ChemComp-LFA / EICOSANE / LIPID FRAGMENT


Mass: 282.547 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C20H42
#15: Chemical ChemComp-FES / FE2/S2 (INORGANIC) CLUSTER


Mass: 175.820 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Fe2S2

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Details

Has ligand of interestN

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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: Cytochrome b6f with natively associated lipids and plastoquinone
Type: COMPLEX / Entity ID: #1, #4-#6, #8 / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Synechocystis sp. PCC 6803 (bacteria)
Buffer solutionpH: 7.6
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: 2500 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 45 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM softwareName: RELION / Version: 3.1 / Category: 3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.15 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 413442 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00316035
ELECTRON MICROSCOPYf_angle_d0.61221894
ELECTRON MICROSCOPYf_dihedral_angle_d11.8472427
ELECTRON MICROSCOPYf_chiral_restr0.0432385
ELECTRON MICROSCOPYf_plane_restr0.0052708

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