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- PDB-6mzi: CryoEM structure of human enterovirus D68 expanded 1 particle (pH... -

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Basic information

Entry
Database: PDB / ID: 6mzi
TitleCryoEM structure of human enterovirus D68 expanded 1 particle (pH 6.5, 4 degrees Celsius, 3 min)
Components
  • viral protein 1
  • viral protein 2
  • viral protein 3
  • viral protein 4
KeywordsVIRUS / genome release / acid
Function / homology
Function and homology information


host cell membrane / cysteine-type peptidase activity / picornain 2A / symbiont-mediated suppression of host mRNA export from nucleus / symbiont genome entry into host cell via pore formation in plasma membrane / picornain 3C / T=pseudo3 icosahedral viral capsid / helicase activity / host cell cytoplasmic vesicle membrane / viral capsid ...host cell membrane / cysteine-type peptidase activity / picornain 2A / symbiont-mediated suppression of host mRNA export from nucleus / symbiont genome entry into host cell via pore formation in plasma membrane / picornain 3C / T=pseudo3 icosahedral viral capsid / helicase activity / host cell cytoplasmic vesicle membrane / viral capsid / host cell / nucleoside-triphosphate phosphatase / channel activity / monoatomic ion transmembrane transport / host cell cytoplasm / RNA helicase activity / symbiont-mediated suppression of host innate immune response / endocytosis involved in viral entry into host cell / symbiont-mediated suppression of host gene expression / symbiont-mediated activation of host autophagy / RNA-directed RNA polymerase / cysteine-type endopeptidase activity / viral RNA genome replication / RNA-directed RNA polymerase activity / DNA-templated transcription / symbiont entry into host cell / virion attachment to host cell / host cell nucleus / structural molecule activity / ATP hydrolysis activity / proteolysis / RNA binding / zinc ion binding / ATP binding / membrane
Similarity search - Function
Picornavirus coat protein VP4 superfamily / Jelly Rolls - #20 / Picornavirus coat protein / Poliovirus 3A protein-like / Poliovirus 3A protein like / Picornavirus 2B protein / Poliovirus core protein 3a, soluble domain / Picornavirus 2B protein / Peptidase C3, picornavirus core protein 2A / Picornavirus core protein 2A ...Picornavirus coat protein VP4 superfamily / Jelly Rolls - #20 / Picornavirus coat protein / Poliovirus 3A protein-like / Poliovirus 3A protein like / Picornavirus 2B protein / Poliovirus core protein 3a, soluble domain / Picornavirus 2B protein / Peptidase C3, picornavirus core protein 2A / Picornavirus core protein 2A / Picornavirus coat protein VP4 / Picornavirus coat protein (VP4) / Peptidase C3A/C3B, picornaviral / 3C cysteine protease (picornain 3C) / Picornavirales 3C/3C-like protease domain / Picornavirales 3C/3C-like protease domain profile. / Picornavirus capsid / picornavirus capsid protein / Helicase, superfamily 3, single-stranded RNA virus / Superfamily 3 helicase of positive ssRNA viruses domain profile. / Helicase, superfamily 3, single-stranded DNA/RNA virus / RNA helicase / Picornavirus/Calicivirus coat protein / Viral coat protein subunit / RNA-directed RNA polymerase, C-terminal domain / Viral RNA-dependent RNA polymerase / Reverse transcriptase/Diguanylate cyclase domain / Jelly Rolls / RNA-directed RNA polymerase, catalytic domain / RdRp of positive ssRNA viruses catalytic domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / Peptidase S1, PA clan, chymotrypsin-like fold / Peptidase S1, PA clan / DNA/RNA polymerase superfamily / Sandwich / P-loop containing nucleoside triphosphate hydrolase / Mainly Beta
Similarity search - Domain/homology
Genome polyprotein / Genome polyprotein / Genome polyprotein
Similarity search - Component
Biological speciesEnterovirus D68
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.46 Å
AuthorsLiu, Y. / Rossmann, M.G.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)AI011219 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2018
Title: Molecular basis for the acid-initiated uncoating of human enterovirus D68.
Authors: Yue Liu / Ju Sheng / Arno L W van Vliet / Geeta Buda / Frank J M van Kuppeveld / Michael G Rossmann /
Abstract: Enterovirus D68 (EV-D68) belongs to a group of enteroviruses that contain a single positive-sense RNA genome surrounded by an icosahedral capsid. Like common cold viruses, EV-D68 mainly causes ...Enterovirus D68 (EV-D68) belongs to a group of enteroviruses that contain a single positive-sense RNA genome surrounded by an icosahedral capsid. Like common cold viruses, EV-D68 mainly causes respiratory infections and is acid-labile. The molecular mechanism by which the acid-sensitive EV-D68 virions uncoat and deliver their genome into a host cell is unknown. Using cryoelectron microscopy (cryo-EM), we have determined the structures of the full native virion and an uncoating intermediate [the A (altered) particle] of EV-D68 at 2.2- and 2.7-Å resolution, respectively. These structures showed that acid treatment of EV-D68 leads to particle expansion, externalization of the viral protein VP1 N termini from the capsid interior, and formation of pores around the icosahedral twofold axes through which the viral RNA can exit. Moreover, because of the low stability of EV-D68, cryo-EM analyses of a mixed population of particles at neutral pH and following acid treatment demonstrated the involvement of multiple structural intermediates during virus uncoating. Among these, a previously undescribed state, the expanded 1 ("E1") particle, shows a majority of internal regions (e.g., the VP1 N termini) to be ordered as in the full native virion. Thus, the E1 particle acts as an intermediate in the transition from full native virions to A particles. Together, the present work delineates the pathway of EV-D68 uncoating and provides the molecular basis for the acid lability of EV-D68 and of the related common cold viruses.
History
DepositionNov 5, 2018Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 19, 2018Provider: repository / Type: Initial release
Revision 1.1Dec 26, 2018Group: Data collection / Database references / Category: citation
Item: _citation.journal_abbrev / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Jan 9, 2019Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.3Dec 18, 2019Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 1.4Mar 13, 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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Structure viewerMolecule:
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Assembly

Deposited unit
A: viral protein 1
B: viral protein 3
C: viral protein 2
D: viral protein 4


Theoretical massNumber of molelcules
Total (without water)94,9374
Polymers94,9374
Non-polymers00
Water00
1
A: viral protein 1
B: viral protein 3
C: viral protein 2
D: viral protein 4
x 60


Theoretical massNumber of molelcules
Total (without water)5,696,233240
Polymers5,696,233240
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation59
2


  • Idetical with deposited unit
  • icosahedral asymmetric unit
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
3
A: viral protein 1
B: viral protein 3
C: viral protein 2
D: viral protein 4
x 5


  • icosahedral pentamer
  • 475 kDa, 20 polymers
Theoretical massNumber of molelcules
Total (without water)474,68620
Polymers474,68620
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation4
4
A: viral protein 1
B: viral protein 3
C: viral protein 2
D: viral protein 4
x 6


  • icosahedral 23 hexamer
  • 570 kDa, 24 polymers
Theoretical massNumber of molelcules
Total (without water)569,62324
Polymers569,62324
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 viral protein 1 / VP1


Mass: 32920.309 Da / Num. of mol.: 1 / Fragment: UNP residues 565-861 / Source method: isolated from a natural source / Details: rhabdomyosarcoma cells / Source: (natural) Enterovirus D68 / Strain: US/MO/14-18047 / References: UniProt: A0A097BW12
#2: Protein viral protein 3 / VP3


Mass: 27112.814 Da / Num. of mol.: 1 / Fragment: UNP residues 318-564 / Source method: isolated from a natural source / Details: rhabdomyosarcoma cells / Source: (natural) Enterovirus D68 / Strain: US/MO/14-18047 / References: UniProt: A0A097BW12
#3: Protein viral protein 2 / VP2


Mass: 27567.135 Da / Num. of mol.: 1 / Fragment: UNP residues 70-317 / Source method: isolated from a natural source / Details: rhabdomyosarcoma cells / Source: (natural) Enterovirus D68 / Strain: US/MO/14-18047 / References: UniProt: A0A0A7X639, UniProt: A0A097BW12*PLUS
#4: Protein viral protein 4 / VP4


Mass: 7336.960 Da / Num. of mol.: 1 / Fragment: UNP residues 2-69 / Source method: isolated from a natural source / Details: rhabdomyosarcoma cells / Source: (natural) Enterovirus D68 / Strain: US/MO/14-18047 / References: UniProt: A0A126D252, UniProt: A0A097BW12*PLUS

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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: Enterovirus D68 / Type: VIRUS
Details: Grown in rhabdomyosarcoma cells and purified to homogeneity
Entity ID: all / Source: NATURAL
Source (natural)Organism: Enterovirus D68 / Strain: US/MO/14-18047
Details of virusEmpty: NO / Enveloped: NO / Isolate: STRAIN / Type: VIRION
Virus shellName: capsid / Diameter: 310 nm
Buffer solutionpH: 6.5 / Details: phosphate citrate buffer
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Treated with a pH 6.5 buffer for about 30 seconds at 4 degrees Celsius
Specimen supportGrid material: COPPER / Grid mesh size: 400 divisions/in.
VitrificationInstrument: GATAN CRYOPLUNGE 3 / Cryogen name: NITROGEN / Humidity: 80 % / Chamber temperature: 298 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 FIELD / Nominal magnification: 81000 X / Nominal defocus max: 8500 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 10.5 sec. / Electron dose: 28 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 357
EM imaging opticsEnergyfilter name: GIF Quantum LS / Energyfilter slit width: 20 eV
Image scansSampling size: 5 µm / Width: 3710 / Height: 3838 / Movie frames/image: 42

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Processing

Software
NameVersionClassificationNB
REFMACrefinement
PDB_EXTRACT3.22data extraction
EM software
IDNameVersionCategory
1Gautomatchparticle selection
2Leginon3.3image acquisition
4jsprCTF correction
7UCSF Chimeramodel fitting
8Cootmodel fitting
10jsprinitial Euler assignment
11jsprfinal Euler assignment
12RELION2.1.0classification
13jspr3D reconstruction
14PHENIXmodel refinement
15REFMACmodel refinement
CTF correctionDetails: On-the-fly CTF correction during 2D alignment and 3D reconstruction
Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 39022
SymmetryPoint symmetry: I (icosahedral)
3D reconstructionResolution: 3.46 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 4968 / Algorithm: FOURIER SPACE / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL / Target criteria: Correlation coefficient
Displacement parametersBiso max: 253.97 Å2 / Biso mean: 55.3098 Å2 / Biso min: 11.48 Å2
Refinement stepCycle: LAST
ProteinNucleic acidLigandSolventTotal
Num. atoms6001 0 0 0 6001

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