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- PDB-6lnu: Cryo-EM structure of immature Zika virus -

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Basic information

Entry
Database: PDB / ID: 6lnu
TitleCryo-EM structure of immature Zika virus
Components(Genome polyprotein) x 2
KeywordsVIRUS / immature Zika virus / flavivirus
Function / homology
Function and homology information


flavivirin / symbiont-mediated suppression of host JAK-STAT cascade via inhibition of host TYK2 activity / symbiont-mediated suppression of host JAK-STAT cascade via inhibition of STAT2 activity / symbiont-mediated suppression of host JAK-STAT cascade via inhibition of STAT1 activity / negative regulation of innate immune response / viral capsid / double-stranded RNA binding / nucleoside-triphosphate phosphatase / 4 iron, 4 sulfur cluster binding / mRNA (guanine-N7)-methyltransferase ...flavivirin / symbiont-mediated suppression of host JAK-STAT cascade via inhibition of host TYK2 activity / symbiont-mediated suppression of host JAK-STAT cascade via inhibition of STAT2 activity / symbiont-mediated suppression of host JAK-STAT cascade via inhibition of STAT1 activity / negative regulation of innate immune response / viral capsid / double-stranded RNA binding / nucleoside-triphosphate phosphatase / 4 iron, 4 sulfur cluster binding / mRNA (guanine-N7)-methyltransferase / methyltransferase cap1 / clathrin-dependent endocytosis of virus by host cell / mRNA (nucleoside-2'-O-)-methyltransferase activity / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / molecular adaptor activity / RNA helicase activity / host cell perinuclear region of cytoplasm / protein dimerization activity / host cell endoplasmic reticulum membrane / RNA helicase / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / induction by virus of host autophagy / RNA-directed RNA polymerase / viral RNA genome replication / serine-type endopeptidase activity / RNA-dependent RNA polymerase activity / virus-mediated perturbation of host defense response / fusion of virus membrane with host endosome membrane / centrosome / lipid binding / viral envelope / host cell nucleus / virion attachment to host cell / GTP binding / structural molecule activity / virion membrane / ATP hydrolysis activity / proteolysis / extracellular region / ATP binding / membrane / metal ion binding
Similarity search - Function
Flavivirus capsid protein C superfamily / Flavivirus non-structural protein NS2B / Genome polyprotein, Flavivirus / : / Flavivirus non-structural protein NS4A / Flavivirus non-structural protein NS2B / Flavivirus capsid protein C / Flavivirus non-structural protein NS4B / mRNA cap 0/1 methyltransferase / Flavivirus capsid protein C ...Flavivirus capsid protein C superfamily / Flavivirus non-structural protein NS2B / Genome polyprotein, Flavivirus / : / Flavivirus non-structural protein NS4A / Flavivirus non-structural protein NS2B / Flavivirus capsid protein C / Flavivirus non-structural protein NS4B / mRNA cap 0/1 methyltransferase / Flavivirus capsid protein C / Flavivirus non-structural protein NS4B / Flavivirus non-structural protein NS4A / Flavivirus NS2B domain profile. / mRNA cap 0 and cap 1 methyltransferase (EC 2.1.1.56 and EC 2.1.1.57) domain profile. / Flavivirus non-structural protein NS2A / Flavivirus non-structural protein NS2A / Flavivirus NS3, petidase S7 / Peptidase S7, Flavivirus NS3 serine protease / Flavivirus NS3 protease (NS3pro) domain profile. / RNA-directed RNA polymerase, thumb domain, Flavivirus / Flavivirus RNA-directed RNA polymerase, thumb domain / RNA-directed RNA polymerase, flavivirus / Flavivirus RNA-directed RNA polymerase, fingers and palm domains / Flavivirus non-structural Protein NS1 / Flavivirus non-structural protein NS1 / Envelope glycoprotein M, flavivirus / Envelope glycoprotein M superfamily, flavivirus / Flavivirus envelope glycoprotein M / Flavivirus polyprotein propeptide / Flavivirus polyprotein propeptide superfamily / Flavivirus polyprotein propeptide / Flavivirus envelope glycoprotein E, stem/anchor domain / Flavivirus envelope glycoprotein E, Stem/Anchor domain / Flavivirus envelope glycoprotein E, Stem/Anchor domain superfamily / Flavivirus glycoprotein E, immunoglobulin-like domain / Flavivirus glycoprotein, immunoglobulin-like domain / Flavivirus glycoprotein central and dimerisation domain / Flavivirus glycoprotein, central and dimerisation domains / Flaviviral glycoprotein E, central domain, subdomain 1 / Flaviviral glycoprotein E, central domain, subdomain 2 / : / Flavivirus NS3 helicase, C-terminal helical domain / Ribosomal RNA methyltransferase, FtsJ domain / FtsJ-like methyltransferase / Flavivirus/Alphavirus glycoprotein, immunoglobulin-like domain superfamily / Flavivirus glycoprotein, central and dimerisation domain superfamily / Flaviviral glycoprotein E, dimerisation domain / DEAD box, Flavivirus / Flavivirus DEAD domain / helicase superfamily c-terminal domain / Immunoglobulin E-set / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / DEAD-like helicases superfamily / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / RNA-directed RNA polymerase, catalytic domain / RdRp of positive ssRNA viruses catalytic domain profile. / S-adenosyl-L-methionine-dependent methyltransferase superfamily / Peptidase S1, PA clan / DNA/RNA polymerase superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Biological speciesZika virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 9 Å
AuthorsTan, T.Y. / Fibriansah, G. / Kostyuchenko, V.A. / Ng, T.S. / Lim, X.X. / Lim, X.N. / Shi, J. / Morais, M.C. / Corti, D. / Lok, S.M.
Funding support Singapore, 3items
OrganizationGrant numberCountry
Ministry of Education (MoE, Singapore)MOE2012-T3-1-008 Singapore
National Research Foundation (NRF, Singapore)NRF-NRFI2016-01 Singapore
National Research Foundation (NRF, Singapore)NRF2015NRF-CRP001-063 Singapore
CitationJournal: Nat Commun / Year: 2020
Title: Capsid protein structure in Zika virus reveals the flavivirus assembly process.
Authors: Ter Yong Tan / Guntur Fibriansah / Victor A Kostyuchenko / Thiam-Seng Ng / Xin-Xiang Lim / Shuijun Zhang / Xin-Ni Lim / Jiaqi Wang / Jian Shi / Marc C Morais / Davide Corti / Shee-Mei Lok /
Abstract: Structures of flavivirus (dengue virus and Zika virus) particles are known to near-atomic resolution and show detailed structure and arrangement of their surface proteins (E and prM in immature virus ...Structures of flavivirus (dengue virus and Zika virus) particles are known to near-atomic resolution and show detailed structure and arrangement of their surface proteins (E and prM in immature virus or M in mature virus). By contrast, the arrangement of the capsid proteins:RNA complex, which forms the core of the particle, is poorly understood, likely due to inherent dynamics. Here, we stabilize immature Zika virus via an antibody that binds across the E and prM proteins, resulting in a subnanometer resolution structure of capsid proteins within the virus particle. Fitting of the capsid protein into densities shows the presence of a helix previously thought to be removed via proteolysis. This structure illuminates capsid protein quaternary organization, including its orientation relative to the lipid membrane and the genomic RNA, and its interactions with the transmembrane regions of the surface proteins. Results show the capsid protein plays a central role in the flavivirus assembly process.
History
DepositionJan 2, 2020Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Feb 26, 2020Provider: repository / Type: Initial release
Revision 1.1Mar 27, 2024Group: Data collection / Database references ...Data collection / Database references / Derived calculations / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_3d_fitting_list / pdbx_initial_refinement_model / pdbx_struct_oper_list
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type / _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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Structure viewerMolecule:
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Assembly

Deposited unit
A: Genome polyprotein
B: Genome polyprotein
C: Genome polyprotein
D: Genome polyprotein
E: Genome polyprotein
F: Genome polyprotein


Theoretical massNumber of molelcules
Total (without water)219,0166
Polymers219,0166
Non-polymers00
Water00
1
A: Genome polyprotein
B: Genome polyprotein
C: Genome polyprotein
D: Genome polyprotein
E: Genome polyprotein
F: Genome polyprotein
x 60


Theoretical massNumber of molelcules
Total (without water)13,140,957360
Polymers13,140,957360
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: Genome polyprotein
B: Genome polyprotein
C: Genome polyprotein
D: Genome polyprotein
E: Genome polyprotein
F: Genome polyprotein
x 5


  • icosahedral pentamer
  • 1.1 MDa, 30 polymers
Theoretical massNumber of molelcules
Total (without water)1,095,08030
Polymers1,095,08030
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation4
4
A: Genome polyprotein
B: Genome polyprotein
C: Genome polyprotein
D: Genome polyprotein
E: Genome polyprotein
F: Genome polyprotein
x 6


  • icosahedral 23 hexamer
  • 1.31 MDa, 36 polymers
Theoretical massNumber of molelcules
Total (without water)1,314,09636
Polymers1,314,09636
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 Genome polyprotein / Coordinate model: Cα atoms only


Mass: 54444.051 Da / Num. of mol.: 3 / Source method: isolated from a natural source
Source: (natural) Zika virus (isolate ZIKV/Human/French Polynesia/10087PF/2013)
Strain: isolate ZIKV/Human/French Polynesia/10087PF/2013
References: UniProt: A0A024B7W1, flavivirin, nucleoside-triphosphate phosphatase, RNA helicase, mRNA (guanine-N7)-methyltransferase, methyltransferase cap1, RNA-directed RNA polymerase
#2: Protein Genome polyprotein / Coordinate model: Cα atoms only


Mass: 18561.266 Da / Num. of mol.: 3 / Source method: isolated from a natural source
Source: (natural) Zika virus (isolate ZIKV/Human/French Polynesia/10087PF/2013)
Strain: isolate ZIKV/Human/French Polynesia/10087PF/2013
References: UniProt: A0A024B7W1, flavivirin, nucleoside-triphosphate phosphatase, RNA helicase, mRNA (guanine-N7)-methyltransferase, methyltransferase cap1, RNA-directed RNA polymerase

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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: Zika virus ZIKV/H. sapiens/FrenchPolynesia/10087PF/2013
Type: VIRUS
Details: The virus was isolated from Zika patient. The immature Zika virus was grown in Aedes Albopictus clone C6/36 cell.
Entity ID: all / Source: NATURAL
Molecular weightUnits: MEGADALTONS / Experimental value: NO
Source (natural)Organism: Zika virus ZIKV/H. sapiens/FrenchPolynesia/10087PF/2013
Strain: H/PF/2013
Details of virusEmpty: NO / Enveloped: YES / Isolate: STRAIN / Type: VIRION
Buffer solutionpH: 8 / Details: 10 mM Tris-HCl, 120 mM NaCl, 1 mM EDTA, pH 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: the virus sample was incubated at 37deg C for 30 min prior to sample blotting onto the grid.
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: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal magnification: 59000 X / Nominal defocus max: 3500 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm
Image recordingElectron dose: 18 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k)

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Processing

EM software
IDNameVersionCategoryDetails
1Gautomatchparticle selection
4GctfCTF correction
7UCSF Chimeramodel fitting
8Cootmodel fitting
10RELION2.1initial Euler assignment
11RELION2.1final Euler assignment
13RELION3D reconstruction
14PHENIXmodel refinementReal-space Refine
CTF correctionType: PHASE FLIPPING ONLY
SymmetryPoint symmetry: I (icosahedral)
3D reconstructionResolution: 9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 7922 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT
Atomic model buildingPDB-ID: 4B03

4b03


Accession code: 4B03 / Source name: PDB / Type: experimental model

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