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- PDB-6ilo: Cryo-EM structure of empty Echovirus 6 particle at PH 7.4 -

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Basic information

Entry
Database: PDB / ID: 6ilo
TitleCryo-EM structure of empty Echovirus 6 particle at PH 7.4
Components
  • Capsid protein VP1
  • Capsid protein VP2
  • Capsid protein VP3
KeywordsVIRUS
Function / homologyJelly Rolls - #20 / Jelly Rolls / Sandwich / Mainly Beta
Function and homology information
Biological speciesEchovirus E6
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsGao, G.F. / Liu, S. / Zhao, X. / Peng, R.
Funding support China, 1items
OrganizationGrant numberCountry
Chinese Academy of SciencesXDB29010000 China
CitationJournal: Cell / Year: 2019
Title: Human Neonatal Fc Receptor Is the Cellular Uncoating Receptor for Enterovirus B.
Authors: Xin Zhao / Guigen Zhang / Sheng Liu / Xiangpeng Chen / Ruchao Peng / Lianpan Dai / Xiao Qu / Shihua Li / Hao Song / Zhengrong Gao / Pengfei Yuan / Zhiheng Liu / Changyao Li / Zifang Shang / ...Authors: Xin Zhao / Guigen Zhang / Sheng Liu / Xiangpeng Chen / Ruchao Peng / Lianpan Dai / Xiao Qu / Shihua Li / Hao Song / Zhengrong Gao / Pengfei Yuan / Zhiheng Liu / Changyao Li / Zifang Shang / Yan Li / Meifan Zhang / Jianxun Qi / Han Wang / Ning Du / Yan Wu / Yuhai Bi / Shan Gao / Yi Shi / Jinghua Yan / Yong Zhang / Zhengde Xie / Wensheng Wei / George F Gao /
Abstract: Enterovirus B (EV-B), a major proportion of the genus Enterovirus in the family Picornaviridae, is the causative agent of severe human infectious diseases. Although cellular receptors for ...Enterovirus B (EV-B), a major proportion of the genus Enterovirus in the family Picornaviridae, is the causative agent of severe human infectious diseases. Although cellular receptors for coxsackievirus B in EV-B have been identified, receptors mediating virus entry, especially the uncoating process of echovirus and other EV-B remain obscure. Here, we found that human neonatal Fc receptor (FcRn) is the uncoating receptor for major EV-B. FcRn binds to the virus particles in the "canyon" through its FCGRT subunit. By obtaining multiple cryo-electron microscopy structures at different stages of virus entry at atomic or near-atomic resolution, we deciphered the underlying mechanisms of enterovirus attachment and uncoating. These structures revealed that different from the attachment receptor CD55, binding of FcRn to the virions induces efficient release of "pocket factor" under acidic conditions and initiates the conformational changes in viral particle, providing a structural basis for understanding the mechanisms of enterovirus entry.
History
DepositionOct 19, 2018Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0May 15, 2019Provider: repository / Type: Initial release
Revision 1.1May 29, 2019Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.title / _citation.year
Revision 1.2Jun 5, 2019Group: Data collection / Database references / Category: citation
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.3Jun 12, 2019Group: Data collection / Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.4Mar 27, 2024Group: Data collection / Database references / Derived calculations
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_struct_oper_list
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_struct_oper_list.name / _pdbx_struct_oper_list.symmetry_operation / _pdbx_struct_oper_list.type

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Structure visualization

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  • Biological unit as complete icosahedral assembly
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  • Biological unit as icosahedral pentamer
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  • Biological unit as icosahedral 23 hexamer
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  • Deposited structure unit
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  • Simplified surface model + fitted atomic model
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Assembly

Deposited unit
A: Capsid protein VP1
B: Capsid protein VP2
C: Capsid protein VP3


Theoretical massNumber of molelcules
Total (without water)79,8473
Polymers79,8473
Non-polymers00
Water0
1
A: Capsid protein VP1
B: Capsid protein VP2
C: Capsid protein VP3
x 60


Theoretical massNumber of molelcules
Total (without water)4,790,813180
Polymers4,790,813180
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation59
Buried area12230 Å2
ΔGint-67 kcal/mol
Surface area30990 Å2
2


  • Idetical with deposited unit
  • icosahedral asymmetric unit
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
3
A: Capsid protein VP1
B: Capsid protein VP2
C: Capsid protein VP3
x 5


  • icosahedral pentamer
  • 399 kDa, 15 polymers
Theoretical massNumber of molelcules
Total (without water)399,23415
Polymers399,23415
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation4
4
A: Capsid protein VP1
B: Capsid protein VP2
C: Capsid protein VP3
x 6


  • icosahedral 23 hexamer
  • 479 kDa, 18 polymers
Theoretical massNumber of molelcules
Total (without water)479,08118
Polymers479,08118
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation5
5


  • Idetical with deposited unit in distinct coordinate
  • icosahedral asymmetric unit, std point frame
TypeNameSymmetry operationNumber
transform to point frame1
SymmetryPoint symmetry: (Schoenflies symbol: I (icosahedral))

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Components

#1: Protein Capsid protein VP1 /


Mass: 26276.416 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Echovirus E6
#2: Protein Capsid protein VP2 /


Mass: 27727.164 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Echovirus E6
#3: Protein Capsid protein VP3 /


Mass: 25843.299 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Echovirus E6
Sequence detailsTHE SEQUENCE OF THIS PROTEIN WAS NOT AVAILABLE AT THE UNIPROT KNOWLEDGEBASE DATABASE (UNIPROTKB) AT ...THE SEQUENCE OF THIS PROTEIN WAS NOT AVAILABLE AT THE UNIPROT KNOWLEDGEBASE DATABASE (UNIPROTKB) AT THE TIME OF DEPOSITION. AUTHORS STATE THAT THE GENEBANK ACCESSION NUMBER IS MH830353.1 FOR THE PROTEIN.

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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: Echovirus E6 / Type: VIRUS / Entity ID: all / Source: NATURAL
Molecular weightUnits: MEGADALTONS / Experimental value: NO
Source (natural)Organism: Echovirus E6
Details of virusEmpty: NO / Enveloped: NO / Isolate: SPECIES / Type: VIRION
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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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 FIELDBright-field microscopy
Image recordingElectron dose: 40 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 QUANTUM (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.11.1_2575: / Classification: refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 15077 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0085610
ELECTRON MICROSCOPYf_angle_d1.0287651
ELECTRON MICROSCOPYf_dihedral_angle_d12.0333312
ELECTRON MICROSCOPYf_chiral_restr0.064847
ELECTRON MICROSCOPYf_plane_restr0.009991

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