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- EMDB-50518: LGTV with TBEV prME -

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Basic information

Entry
Database: EMDB / ID: EMD-50518
TitleLGTV with TBEV prME
Map dataSharpened with deepEMchancer.
Sample
  • Virus: LGTV with TBEV prME
    • Complex: Envelope protein E
      • Protein or peptide: Envelope protein E
    • Complex: Small envelope protein M
      • Protein or peptide: Small envelope protein M
  • Ligand: 1-PALMITOYL-2-LINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE
KeywordsChimeric virus / Flavivirus / Tick-borne Encephalitis virus / Langat virus / recombinant virus / VIRUS
Function / homology
Function and homology information


symbiont-mediated suppression of host JAK-STAT cascade via inhibition of JAK1 activity / 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 / ribonucleoside triphosphate phosphatase activity / symbiont-mediated activation of host apoptosis / viral capsid / double-stranded RNA binding / nucleoside-triphosphate phosphatase ...symbiont-mediated suppression of host JAK-STAT cascade via inhibition of JAK1 activity / 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 / ribonucleoside triphosphate phosphatase activity / symbiont-mediated activation of host apoptosis / viral capsid / double-stranded RNA binding / nucleoside-triphosphate phosphatase / mRNA (guanine-N7)-methyltransferase / methyltransferase cap1 / clathrin-dependent endocytosis of virus by host cell / methyltransferase cap1 activity / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / RNA helicase activity / protein dimerization activity / host cell perinuclear region of cytoplasm / symbiont-mediated suppression of host innate immune response / host cell endoplasmic reticulum membrane / RNA helicase / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / symbiont-mediated activation of host autophagy / serine-type endopeptidase activity / RNA-directed RNA polymerase / viral RNA genome replication / RNA-directed RNA polymerase activity / fusion of virus membrane with host endosome membrane / viral envelope / symbiont entry into host cell / virion attachment to host cell / host cell nucleus / virion membrane / structural molecule activity / ATP hydrolysis activity / proteolysis / extracellular region / ATP binding / metal ion binding / membrane
Similarity search - Function
Genome polyprotein, Flavivirus / : / Flavivirus non-structural protein NS4A / Flavivirus non-structural protein NS2B / Flavivirus non-structural protein NS4B / mRNA cap 0/1 methyltransferase / 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. ...Genome polyprotein, Flavivirus / : / Flavivirus non-structural protein NS4A / Flavivirus non-structural protein NS2B / Flavivirus non-structural protein NS4B / mRNA cap 0/1 methyltransferase / 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 capsid protein C / Flavivirus capsid protein C / 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 NS3 helicase, C-terminal helical 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 / 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
Genome polyprotein / Genome polyprotein
Similarity search - Component
Biological speciestick-borne encephalitis virus-European subtype / Langat virus (strain TP21)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.22 Å
AuthorsBisikalo K / Rosendal E
Funding support Sweden, 1 items
OrganizationGrant numberCountry
Swedish Research Council2018-05851 Sweden
Citation
Journal: J Virol / Year: 2025
Title: Influence of the pre-membrane and envelope proteins on structure, pathogenicity, and tropism of tick-borne encephalitis virus.
Authors: Ebba Rosendal / Kyrylo Bisikalo / Stefanie M A Willekens / Marie Lindgren / Jiří Holoubek / Pavel Svoboda / Amanda Lappalainen / Ebba Könighofer / Ekaterina Mirgorodskaya / Rickard ...Authors: Ebba Rosendal / Kyrylo Bisikalo / Stefanie M A Willekens / Marie Lindgren / Jiří Holoubek / Pavel Svoboda / Amanda Lappalainen / Ebba Könighofer / Ekaterina Mirgorodskaya / Rickard Nordén / Federico Morini / William Rosenbaum / Daniel Růžek / Ulf Ahlgren / Maria Anastasina / Andres Merits / Sarah J Butcher / Emma Nilsson / Anna K Överby /
Abstract: Tick-borne encephalitis virus (TBEV) is a neurotropic flavivirus that causes thousands of human infections annually. Viral tropism in the brain is determined by the presence of necessary receptors, ...Tick-borne encephalitis virus (TBEV) is a neurotropic flavivirus that causes thousands of human infections annually. Viral tropism in the brain is determined by the presence of necessary receptors, entry factors, and the ability of the virus to overcome host defenses. The viral structural proteins, pre-membrane (prM), and envelope (E) play an important role in receptor binding, membrane fusion, particle maturation, and antibody neutralization. To understand how these proteins influence virus distribution and tropism in the brain, we generated a chimeric virus harboring the prM and ectodomain of E from TBEV in the background of the low-pathogenic Langat virus (LGTV). We solved the atomic structures of both the chimeric virus and LGTV to compare them to the known TBEV structure. We show that this chimeric virus remains low-pathogenic, while being structurally and antigenically similar to TBEV. Using 3D optical whole brain imaging combined with immunohistochemistry, we found that both LGTV and the chimeric virus primarily infect the cerebral cortex, with no significant differences in their localization or tropism. In contrast, TBEV shows high infection of the cerebellum and a strong preference toward Purkinje cells, indicating that factors other than the prM and E proteins are important for determining TBEV tropism in the brain. Together, this provides new insights into the roles of the structural and non-structural proteins of tick-borne flaviviruses.
IMPORTANCE: Although an effective vaccine exists, there is no treatment for those infected by the tick-borne encephalitis virus (TBEV). This study aimed to better understand how the virus's surface ...IMPORTANCE: Although an effective vaccine exists, there is no treatment for those infected by the tick-borne encephalitis virus (TBEV). This study aimed to better understand how the virus's surface proteins influence viral tropism and pathogenicity. We created a chimeric virus with prM and E proteins of TBEV in the genetic background of the low-pathogenic Langat virus (LGTV). The chimeric virus remained low pathogenic, similar to LGTV. Both viruses infected similar brain regions, while TBEV showed a strong preference for the cerebellum and Purkinje cells. This means that other parts of the virus, such as non-structural proteins or NCR, likely decide how the virus behaves in the brain. This study also presents the first cryogenic electron microscopy structure of LGTV, the first whole-brain imaging of TBEV infection in mouse brain, and a new model system to study surface proteins in tick-borne flaviviruses-laying groundwork for future studies on viral tropism, antibody cross-reactivity, and virus-receptor interaction.
#1: Journal: Biorxiv / Year: 2024
Title: The influence of the pre-membrane and envelope proteins on structure, pathogenicity and tropism of tick-borne encephalitis virus
Authors: Rosendal E / Bisikalo K / Willekens SM / Lindgren M / Holoubek J / Svoboda P / Lappalainen A / Konighofer E / Mirgorodskaya E / Norden R / Morini F / Rosenbaum W / Ruzek D / Ahlgren U / ...Authors: Rosendal E / Bisikalo K / Willekens SM / Lindgren M / Holoubek J / Svoboda P / Lappalainen A / Konighofer E / Mirgorodskaya E / Norden R / Morini F / Rosenbaum W / Ruzek D / Ahlgren U / Anastasina M / Merits A / Butcher SJ / Nilsson E / Overby AK
History
DepositionJun 1, 2024-
Header (metadata) releaseNov 6, 2024-
Map releaseNov 6, 2024-
UpdateSep 3, 2025-
Current statusSep 3, 2025Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_50518.png

Downloads & links

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Map

FileDownload / File: emd_50518.map.gz / Format: CCP4 / Size: 1.3 GB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationSharpened with deepEMchancer.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.94 Å/pix.
x 700 pix.
= 660.8 Å		0.94 Å/pix.
x 700 pix.
= 660.8 Å		0.94 Å/pix.
x 700 pix.
= 660.8 Å

Surface

Projections

Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.944 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.04
Minimum - Maximum-0.030535376 - 2.2547908
Average (Standard dev.)0.0066743316 (±0.058691252)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions700700700
Spacing700700700
CellA=B=C: 660.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_50518_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_50518_half_map_2.map
Projections & Slices
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Histogram

Histogram (log scale)

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Sample components

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Entire : LGTV with TBEV prME

EntireName: LGTV with TBEV prME
Components
  • Virus: LGTV with TBEV prME
    • Complex: Envelope protein E
      • Protein or peptide: Envelope protein E
    • Complex: Small envelope protein M
      • Protein or peptide: Small envelope protein M
  • Ligand: 1-PALMITOYL-2-LINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE

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Supramolecule #1: LGTV with TBEV prME

SupramoleculeName: LGTV with TBEV prME / type: virus / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Details: Chimeric virus based on the Langat virus (LGTV) and Tick-borne Encephalitis virus (TBEV). prM and ectodomains of E are taken from TBEV (European subtype, strain 93/873), while the rest of ...Details: Chimeric virus based on the Langat virus (LGTV) and Tick-borne Encephalitis virus (TBEV). prM and ectodomains of E are taken from TBEV (European subtype, strain 93/873), while the rest of the virus genome is from LGTV TP21.
Virus type: VIRION / Virus isolate: OTHER / Virus enveloped: Yes / Virus empty: No
Virus shellShell ID: 1 / Diameter: 500.0 Å / T number (triangulation number): 3

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Supramolecule #2: Envelope protein E

SupramoleculeName: Envelope protein E / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: tick-borne encephalitis virus-European subtype / Strain: Chimeric virus (prME from TBEV)

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Supramolecule #3: Small envelope protein M

SupramoleculeName: Small envelope protein M / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2
Source (natural)Organism: tick-borne encephalitis virus-European subtype / Strain: Chimeric virus (prME from TBEV)

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Macromolecule #1: Envelope protein E

MacromoleculeName: Envelope protein E / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Langat virus (strain TP21) / Strain: 93/783
Molecular weightTheoretical: 53.646422 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: SRCTHLENRD FVTGTQGTTR VTLVLELGGC VTITAEGKPS MDVWLDAIYQ ENPAKTREYC LHAKLSDTKV AARCPTMGPA TLTEEHQGG TVCKRDQSDR GWGNHCGLFG KGSIVACVKA ACEAKKKATG HVYDANKIVY TVKVEPHTGD YVAANETHSG R KTASFTVS ...String:
SRCTHLENRD FVTGTQGTTR VTLVLELGGC VTITAEGKPS MDVWLDAIYQ ENPAKTREYC LHAKLSDTKV AARCPTMGPA TLTEEHQGG TVCKRDQSDR GWGNHCGLFG KGSIVACVKA ACEAKKKATG HVYDANKIVY TVKVEPHTGD YVAANETHSG R KTASFTVS SEKTILTMGE YGDVSLLCRV ASGVDLAQTV ILELDKTVEH LPTAWQVHRD WFNDLALPWK HEGAQNWNNA ER LVEFGAP HAVKMDVYNL GDQTGVLLKA LAGVPVAHIE GTKYHLKSGH VTCEVGLEKL KMKGLTYTMC DKTKFTWKRA PTD SGHDTV VMEVTFSGTK PCRIPVRAVA HGSPDVNVAM LITPNPTIEN NGGGFIEMQL PPGDNIIYVG ELSHQWFQKG SSIG RVFQK TKKGIERLTV IGEHAWDFGS AGGFMTSIGR AMHTVLGGAF NTLLGGVGFL PKILLGVAMA WLGLNMRNPT LSMGF LLSG GLVLAMTLGV GA

UniProtKB: Genome polyprotein, Genome polyprotein

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Macromolecule #2: Small envelope protein M

MacromoleculeName: Small envelope protein M / type: protein_or_peptide / ID: 2 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: tick-borne encephalitis virus-European subtype / Strain: 93/783
Molecular weightTheoretical: 8.311854 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString:
SVLIPSHAQG ELTGRGHKWL EGDSLRTHLT RVEGWVWKNK LLALAMVTVV WLTLESVVTR VAVLVVLLCL APVYA

UniProtKB: Genome polyprotein

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Macromolecule #4: 1-PALMITOYL-2-LINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE

MacromoleculeName: 1-PALMITOYL-2-LINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / type: ligand / ID: 4 / Number of copies: 6 / Formula: CPL
Molecular weightTheoretical: 758.06 Da
Chemical component information

ChemComp-CPL:
1-PALMITOYL-2-LINOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / phospholipid*YM

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 8
Details: VP-SFM growth medium, supplemented with rapamycin and glutamate.
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Support film - Film thickness: 2 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 15 sec. / Pretreatment - Atmosphere: OTHER
VitrificationCryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 298 K / Instrument: LEICA EM GP

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: TFS FALCON 4i (4k x 4k) / Detector mode: COUNTING / Number grids imaged: 1 / Number real images: 32122 / Average exposure time: 4.27 sec. / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 130000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 97855
CTF correctionSoftware - Name: cryoSPARC / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER / Details: CryoSPARC Ab-Initio
Final reconstructionNumber classes used: 2 / Applied symmetry - Point group: I (icosahedral) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.22 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 18724
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final 3D classificationNumber classes: 2 / Avg.num./class: 9000 / Software - Name: cryoSPARC
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelChain - Source name: AlphaFold / Chain - Initial model type: in silico model
Output model

PDB-9fk0:
LGTV with TBEV prME

PDB-9h28:
Alternative conformation LGTV with TBEV prME

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