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- PDB-6zqw: Cryo-EM structure of immature Spondweni virus -

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Basic information

Entry
Database: PDB / ID: 6zqw
TitleCryo-EM structure of immature Spondweni virus
Components
  • Genome polyprotein
  • prM
KeywordsVIRUS / Flavivirus
Function / homology
Function and homology information


symbiont-mediated suppression of host JAK-STAT cascade via inhibition of STAT2 activity / ribonucleoside triphosphate phosphatase activity / viral capsid / double-stranded RNA binding / mRNA (nucleoside-2'-O-)-methyltransferase activity / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / RNA helicase activity / host cell endoplasmic reticulum membrane / protein dimerization activity / symbiont entry into host cell ...symbiont-mediated suppression of host JAK-STAT cascade via inhibition of STAT2 activity / ribonucleoside triphosphate phosphatase activity / viral capsid / double-stranded RNA binding / mRNA (nucleoside-2'-O-)-methyltransferase activity / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / RNA helicase activity / host cell endoplasmic reticulum membrane / protein dimerization activity / symbiont entry into host cell / viral RNA genome replication / RNA-dependent RNA polymerase activity / serine-type endopeptidase activity / fusion of virus membrane with host endosome membrane / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / host cell nucleus / virion attachment to host cell / virion membrane / structural molecule activity / proteolysis / extracellular region / ATP binding / membrane / metal ion binding
Similarity search - Function
: / Flavivirus envelope glycoprotein E, stem/anchor domain / RNA-directed RNA polymerase, thumb domain, Flavivirus / Flavivirus RNA-directed RNA polymerase, thumb domain / Flavivirus capsid protein C superfamily / : / Flavivirus non-structural protein NS2B / Flavivirus NS3 helicase, C-terminal helical domain / Genome polyprotein, Flavivirus / Flavivirus non-structural protein NS4A ...: / Flavivirus envelope glycoprotein E, stem/anchor domain / RNA-directed RNA polymerase, thumb domain, Flavivirus / Flavivirus RNA-directed RNA polymerase, thumb domain / Flavivirus capsid protein C superfamily / : / Flavivirus non-structural protein NS2B / Flavivirus NS3 helicase, C-terminal helical domain / 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. / Envelope glycoprotein M, flavivirus / Flavivirus envelope glycoprotein M / 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 superfamily, flavivirus / Flavivirus polyprotein propeptide / Flavivirus polyprotein propeptide superfamily / Flavivirus polyprotein propeptide / Flaviviral glycoprotein E, central domain, subdomain 1 / Flaviviral glycoprotein E, central domain, subdomain 2 / Flavivirus envelope glycoprotein E, Stem/Anchor domain / Flavivirus glycoprotein E, immunoglobulin-like domain / Flavivirus envelope glycoprotein E, Stem/Anchor domain superfamily / Flavivirus glycoprotein, immunoglobulin-like domain / Flavivirus glycoprotein central and dimerisation domain / Flavivirus glycoprotein, central and dimerisation domains / 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 speciesSpondweni virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 7.8 Å
AuthorsRenner, M. / Dejnirattisai, W. / Carrique, L. / Serna Martin, I. / Karia, D. / Ilca, S.L. / Ho, S.F. / Kotecha, A. / Keown, J.R. / Mongkolsapaya, J. ...Renner, M. / Dejnirattisai, W. / Carrique, L. / Serna Martin, I. / Karia, D. / Ilca, S.L. / Ho, S.F. / Kotecha, A. / Keown, J.R. / Mongkolsapaya, J. / Screaton, G.R. / Grimes, J.M.
Funding support United Kingdom, 5items
OrganizationGrant numberCountry
Wellcome Trust060208/Z/00/Z United Kingdom
Wellcome Trust093305/Z/10/Z United Kingdom
Wellcome Trust204703/Z/16/Z United Kingdom
Wellcome Trust200835/Z/16/Z United Kingdom
Wellcome Trust203141/Z/16/Z United Kingdom
CitationJournal: Nat Commun / Year: 2021
Title: Flavivirus maturation leads to the formation of an occupied lipid pocket in the surface glycoproteins.
Authors: Max Renner / Wanwisa Dejnirattisai / Loïc Carrique / Itziar Serna Martin / Dimple Karia / Serban L Ilca / Shu F Ho / Abhay Kotecha / Jeremy R Keown / Juthathip Mongkolsapaya / Gavin R ...Authors: Max Renner / Wanwisa Dejnirattisai / Loïc Carrique / Itziar Serna Martin / Dimple Karia / Serban L Ilca / Shu F Ho / Abhay Kotecha / Jeremy R Keown / Juthathip Mongkolsapaya / Gavin R Screaton / Jonathan M Grimes /
Abstract: Flaviviruses such as Dengue (DENV) or Zika virus (ZIKV) assemble into an immature form within the endoplasmatic reticulum (ER), and are then processed by furin protease in the trans-Golgi. To better ...Flaviviruses such as Dengue (DENV) or Zika virus (ZIKV) assemble into an immature form within the endoplasmatic reticulum (ER), and are then processed by furin protease in the trans-Golgi. To better grasp maturation, we carry out cryo-EM reconstructions of immature Spondweni virus (SPOV), a human flavivirus of the same serogroup as ZIKV. By employing asymmetric localised reconstruction we push the resolution to 3.8 Å, enabling us to refine an atomic model which includes the crucial furin protease recognition site and a conserved Histidine pH-sensor. For direct comparison, we also solve structures of the mature forms of SPONV and DENV to 2.6 Å and 3.1 Å, respectively. We identify an ordered lipid that is present in only the mature forms of ZIKV, SPOV, and DENV and can bind as a consequence of rearranging amphipathic stem-helices of E during maturation. We propose a structural role for the pocket and suggest it stabilizes mature E.
History
DepositionJul 10, 2020Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jan 20, 2021Provider: repository / Type: Initial release
Revision 1.1Aug 4, 2021Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.name

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Structure visualization

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Assembly

Deposited unit
A: Genome polyprotein
B: prM
D: Genome polyprotein
E: prM
G: Genome polyprotein
H: prM
I: prM
F: prM
C: prM
hetero molecules


Theoretical massNumber of molelcules
Total (without water)279,60312
Polymers278,9399
Non-polymers6643
Water0
1
A: Genome polyprotein
B: prM
D: Genome polyprotein
E: prM
G: Genome polyprotein
H: prM
I: prM
F: prM
C: prM
hetero molecules
x 60


Theoretical massNumber of molelcules
Total (without water)16,776,165720
Polymers16,736,348540
Non-polymers39,817180
Water0
TypeNameSymmetry operationNumber
identity operation1
point symmetry operation59

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Components

#1: Protein Genome polyprotein


Mass: 54838.207 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) Spondweni virus / References: UniProt: C8XPB6
#2: Protein
prM / prM


Mass: 19070.752 Da / Num. of mol.: 6 / Source method: isolated from a natural source / Source: (natural) Spondweni virus / References: UniProt: C8XPB6
#3: 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 / N-Acetylglucosamine


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Formula: C8H15NO6
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
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: Spondweni virus / Type: VIRUS / Details: Virus cultivated in C6/36 cells / Entity ID: #1-#2 / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Spondweni virus
Details of virusEmpty: NO / Enveloped: YES / Isolate: OTHER / Type: VIRION
Natural hostOrganism: Aedes circumluteolus
Buffer solutionpH: 7.4 / Details: PBS buffer
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: UV inactivated
Specimen supportGrid material: GOLD / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE

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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 / Cs: 2.7 mm
Image recordingElectron dose: 30 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
EM software
IDNameVersionCategory
1cryoSPARCparticle selection
4Gctf1.06CTF correction
10RELION3.1initial Euler assignment
11RELION3.1final Euler assignment
13RELION3.13D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 42880
SymmetryPoint symmetry: I (icosahedral)
3D reconstructionResolution: 7.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 11768 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00215432
ELECTRON MICROSCOPYf_angle_d0.53920886
ELECTRON MICROSCOPYf_dihedral_angle_d18.745496
ELECTRON MICROSCOPYf_chiral_restr0.0422319
ELECTRON MICROSCOPYf_plane_restr0.0032661

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