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- PDB-8ozh: In situ cryoEM structure of Prototype Foamy Virus Env trimer -

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Basic information

Entry
Database: PDB / ID: 8ozh
TitleIn situ cryoEM structure of Prototype Foamy Virus Env trimer
ComponentsEnvelope glycoprotein
KeywordsVIRAL PROTEIN / membrane fusion / envelope glycoprotein / foamy virus / MPER / transmembrane / MEMBRANE PROTEIN
Function / homologyCHOLESTEROL / PHOSPHATIDYLETHANOLAMINE
Function and homology information
Biological speciesEastern chimpanzee simian foamy virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.91 Å
AuthorsCalcraft, T. / Nans, A. / Rosenthal, P.B.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
The Francis Crick Institute United Kingdom
CitationJournal: Cell / Year: 2024
Title: Integrated cryoEM structure of a spumaretrovirus reveals cross-kingdom evolutionary relationships and the molecular basis for assembly and virus entry.
Authors: Thomas Calcraft / Nicole Stanke-Scheffler / Andrea Nans / Dirk Lindemann / Ian A Taylor / Peter B Rosenthal /
Abstract: Foamy viruses (FVs) are an ancient lineage of retroviruses, with an evolutionary history spanning over 450 million years. Vector systems based on Prototype Foamy Virus (PFV) are promising candidates ...Foamy viruses (FVs) are an ancient lineage of retroviruses, with an evolutionary history spanning over 450 million years. Vector systems based on Prototype Foamy Virus (PFV) are promising candidates for gene and oncolytic therapies. Structural studies of PFV contribute to the understanding of the mechanisms of FV replication, cell entry and infection, and retroviral evolution. Here we combine cryoEM and cryoET to determine high-resolution in situ structures of the PFV icosahedral capsid (CA) and envelope glycoprotein (Env), including its type III transmembrane anchor and membrane-proximal external region (MPER), and show how they are organized in an integrated structure of assembled PFV particles. The atomic models reveal an ancient retroviral capsid architecture and an unexpected relationship between Env and other class 1 fusion proteins of the Mononegavirales. Our results represent the de novo structure determination of an assembled retrovirus particle.
History
DepositionMay 9, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jul 10, 2024Provider: repository / Type: Initial release
Revision 1.1Jul 17, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.title / _citation.year / _em_admin.last_update
Revision 1.2Aug 7, 2024Group: Data collection / Database references
Category: citation / citation_author ...citation / citation_author / em_admin / pdbx_database_related
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _em_admin.last_update
Revision 1.3Aug 21, 2024Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _em_admin.last_update
Revision 1.4Oct 23, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Envelope glycoprotein
B: Envelope glycoprotein
C: Envelope glycoprotein
D: Envelope glycoprotein
E: Envelope glycoprotein
F: Envelope glycoprotein
G: Envelope glycoprotein
H: Envelope glycoprotein
I: Envelope glycoprotein
J: Envelope glycoprotein
K: Envelope glycoprotein
L: Envelope glycoprotein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)1,389,58651
Polymers1,365,65512
Non-polymers23,93139
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Noncrystallographic symmetry (NCS)NCS oper:
IDCodeMatrixVector
1given(1), (1), (1)
2given(-0.5, -0.866025), (0.866025, -0.5), (1)613.27372, 164.3263
3given(-0.5, 0.866025), (-0.866025, -0.5), (1)164.3263, 613.27373

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Components

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Protein , 1 types, 12 molecules ABCDEFGHIJKL

#1: Protein
Envelope glycoprotein / Env polyprotein


Mass: 113804.594 Da / Num. of mol.: 12
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Eastern chimpanzee simian foamy virus / Gene: env / Production host: Homo sapiens (human)

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Sugars , 7 types, 33 molecules

#2: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 9
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#3: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}LINUCSPDB-CARE
#4: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1114.016 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-2DManpa1-3[DManpa1-6]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-1-3/a4-b1_b4-c1_c3-d1_c6-f1_d2-e1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][b-D-GlcpNAc]{}}[(6+1)][a-D-Manp]{}}}}LINUCSPDB-CARE
#5: Polysaccharide alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1- ...alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 748.682 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-6DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,4,3/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3/a4-b1_b4-c1_c6-d1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(6+1)][a-D-Manp]{}}}}LINUCSPDB-CARE
#6: Polysaccharide alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1397.245 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-2DManpa1-3[DManpa1-6]DManpa1-6[DManpa1-3]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,8,7/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3-3-3/a4-b1_b4-c1_c3-d1_c6-e1_e3-f1_e6-h1_f2-g1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{[(3+1)][a-D-Manp]{[(2+1)][a-D-Manp]{}}[(6+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#7: Polysaccharide alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D- ...alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1072.964 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3DManpa1-6[DManpa1-3]DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/3,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1122h-1a_1-5]/1-1-2-3-3-3/a4-b1_b4-c1_c3-d1_c6-e1_e3-f1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][a-D-Manp]{[(3+1)][a-D-Manp]{}}}}}LINUCSPDB-CARE
#8: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 9 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 2 types, 6 molecules

#9: Chemical ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C27H46O / Feature type: SUBJECT OF INVESTIGATION
#10: Chemical ChemComp-PTY / PHOSPHATIDYLETHANOLAMINE


Mass: 734.039 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C40H80NO8P / Feature type: SUBJECT OF INVESTIGATION / Comment: phospholipid*YM

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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: Eastern chimpanzee simian foamy virus / Type: VIRUS / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Eastern chimpanzee simian foamy virus
Source (recombinant)Organism: Homo sapiens (human)
Details of virusEmpty: NO / Enveloped: YES / Isolate: STRAIN / Type: VIRION
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid type: Quantifoil R2/2
VitrificationInstrument: FEI VITROBOT MARK III / Cryogen 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: 4000 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / Alignment procedure: ZEMLIN TABLEAU
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 48 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)
EM imaging opticsEnergyfilter name: GIF Quantum LS / Energyfilter slit width: 20 eV
Image scansWidth: 3838 / Height: 3710

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Processing

SoftwareName: REFMAC / Version: 5.8.0352 / Classification: refinement
EM software
IDNameCategory
1crYOLOparticle selection
2EPUimage acquisition
4GctfCTF correction
9RELIONinitial Euler assignment
10RELIONfinal Euler assignment
12RELION3D reconstruction
19REFMACmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 2103361
SymmetryPoint symmetry: C3 (3 fold cyclic)
3D reconstructionResolution: 2.91 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 286827 / Algorithm: FOURIER SPACE / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: RECIPROCAL
RefinementResolution: 2.91→220.32 Å / Cor.coef. Fo:Fc: 0.903 / SU B: 5.802 / SU ML: 0.109 / ESU R: 0.142
Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES
Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
RfactorNum. reflection% reflection
Rwork0.28509 --
obs0.28509 288599 100 %
Solvent computationSolvent model: PARAMETERS FOR MASK CACLULATION
Displacement parametersBiso mean: 113.583 Å2
Refinement stepCycle: 1 / Total: 7612
Refine LS restraints
Refine-IDTypeDev idealDev ideal targetNumber
ELECTRON MICROSCOPYr_bond_refined_d0.0140.0127828
ELECTRON MICROSCOPYr_bond_other_d00.0167123
ELECTRON MICROSCOPYr_angle_refined_deg1.5661.6710702
ELECTRON MICROSCOPYr_angle_other_deg1.0061.55416743
ELECTRON MICROSCOPYr_dihedral_angle_1_deg6.1055873
ELECTRON MICROSCOPYr_dihedral_angle_2_deg9.069.59537
ELECTRON MICROSCOPYr_dihedral_angle_3_deg15.819101263
ELECTRON MICROSCOPYr_dihedral_angle_4_deg
ELECTRON MICROSCOPYr_chiral_restr0.0680.21304
ELECTRON MICROSCOPYr_gen_planes_refined0.0040.028236
ELECTRON MICROSCOPYr_gen_planes_other0.0040.021411
ELECTRON MICROSCOPYr_nbd_refined
ELECTRON MICROSCOPYr_nbd_other
ELECTRON MICROSCOPYr_nbtor_refined
ELECTRON MICROSCOPYr_nbtor_other
ELECTRON MICROSCOPYr_xyhbond_nbd_refined
ELECTRON MICROSCOPYr_xyhbond_nbd_other
ELECTRON MICROSCOPYr_metal_ion_refined
ELECTRON MICROSCOPYr_metal_ion_other
ELECTRON MICROSCOPYr_symmetry_vdw_refined
ELECTRON MICROSCOPYr_symmetry_vdw_other
ELECTRON MICROSCOPYr_symmetry_hbond_refined
ELECTRON MICROSCOPYr_symmetry_hbond_other
ELECTRON MICROSCOPYr_symmetry_metal_ion_refined
ELECTRON MICROSCOPYr_symmetry_metal_ion_other
ELECTRON MICROSCOPYr_mcbond_it13.41810.3623510
ELECTRON MICROSCOPYr_mcbond_other13.41610.3623510
ELECTRON MICROSCOPYr_mcangle_it17.21915.6294377
ELECTRON MICROSCOPYr_mcangle_other17.21715.6334378
ELECTRON MICROSCOPYr_scbond_it15.78712.6694318
ELECTRON MICROSCOPYr_scbond_other15.78512.674319
ELECTRON MICROSCOPYr_scangle_it
ELECTRON MICROSCOPYr_scangle_other22.3218.4516326
ELECTRON MICROSCOPYr_long_range_B_refined26.4047658
ELECTRON MICROSCOPYr_long_range_B_other26.4027659
ELECTRON MICROSCOPYr_rigid_bond_restr
ELECTRON MICROSCOPYr_sphericity_free
ELECTRON MICROSCOPYr_sphericity_bonded
LS refinement shellResolution: 2.91→2.986 Å / Total num. of bins used: 20
RfactorNum. reflection% reflection
Rfree0 0 -
Rwork2.453 21242 -
obs--100 %

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