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- EMDB-22629: The N-terminus of varicella-zoster virus glycoprotein B has a fun... -

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Basic information

Entry
Database: EMDB / ID: EMD-22629
TitleThe N-terminus of varicella-zoster virus glycoprotein B has a functional role in fusion.
Map dataCryo-EM map of varicella-zoster virus glycoprotein B purified from infected cells
Sample
  • Complex: Varicella-zoster virus glycoprotein B trimer.
    • Protein or peptide: Envelope glycoprotein B
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
Function / homology
Function and homology information


host cell endosome / host cell Golgi apparatus / symbiont entry into host cell / viral envelope / virion attachment to host cell / host cell plasma membrane / membrane
Similarity search - Function
Herpesvirus Glycoprotein B / Herpesvirus Glycoprotein B, PH-like domain 1 / Herpesvirus Glycoprotein B, PH-like domain 2 / Herpesvirus Glycoprotein B, PH-like domain 2 superfamily / Herpesvirus Glycoprotein B ectodomain / Herpesvirus Glycoprotein B / Herpesvirus Glycoprotein B PH-like domain
Similarity search - Domain/homology
Envelope glycoprotein B
Similarity search - Component
Biological speciesHuman alphaherpesvirus 3 (Varicella-zoster virus) / HHV-3 (Varicella-zoster virus)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.9 Å
AuthorsOliver SL
Funding support United States, 6 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)P41-GM103832 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01-AI102546 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01-GM079429 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R37-AI20459 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01 AI10254601 United States
National Institutes of Health/Office of the DirectorS10-OD021600 United States
CitationJournal: PLoS Pathog / Year: 2021
Title: The N-terminus of varicella-zoster virus glycoprotein B has a functional role in fusion.
Authors: Stefan L Oliver / Yi Xing / Dong-Hua Chen / Soung Hun Roh / Grigore D Pintilie / David A Bushnell / Marvin H Sommer / Edward Yang / Andrea Carfi / Wah Chiu / Ann M Arvin /
Abstract: Varicella-zoster virus (VZV) is a medically important alphaherpesvirus that induces fusion of the virion envelope and the cell membrane during entry, and between cells to form polykaryocytes within ...Varicella-zoster virus (VZV) is a medically important alphaherpesvirus that induces fusion of the virion envelope and the cell membrane during entry, and between cells to form polykaryocytes within infected tissues during pathogenesis. All members of the Herpesviridae, including VZV, have a conserved core fusion complex composed of glycoproteins, gB, gH and gL. The ectodomain of the primary fusogen, gB, has five domains, DI-V, of which DI contains the fusion loops needed for fusion function. We recently demonstrated that DIV is critical for fusion initiation, which was revealed by a 2.8Å structure of a VZV neutralizing mAb, 93k, bound to gB and mutagenesis of the gB-93k interface. To further assess the mechanism of mAb 93k neutralization, the binding site of a non-neutralizing mAb to gB, SG2, was compared to mAb 93k using single particle cryogenic electron microscopy (cryo-EM). The gB-SG2 interface partially overlapped with that of gB-93k but, unlike mAb 93k, mAb SG2 did not interact with the gB N-terminus, suggesting a potential role for the gB N-terminus in membrane fusion. The gB ectodomain structure in the absence of antibody was defined at near atomic resolution by single particle cryo-EM (3.9Å) of native, full-length gB purified from infected cells and by X-ray crystallography (2.4Å) of the transiently expressed ectodomain. Both structures revealed that the VZV gB N-terminus (aa72-114) was flexible based on the absence of visible structures in the cryo-EM or X-ray crystallography data but the presence of gB N-terminal peptides were confirmed by mass spectrometry. Notably, N-terminal residues 109KSQD112 were predicted to form a small α-helix and alanine substitution of these residues abolished cell-cell fusion in a virus-free assay. Importantly, transferring the 109AAAA112 mutation into the VZV genome significantly impaired viral propagation. These data establish a functional role for the gB N-terminus in membrane fusion broadly relevant to the Herpesviridae.
History
DepositionSep 8, 2020-
Header (metadata) releaseJan 20, 2021-
Map releaseJan 20, 2021-
UpdateJan 20, 2021-
Current statusJan 20, 2021Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7k1s
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-7k1s
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_22629.png

Downloads & links

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Map

FileDownload / File: emd_22629.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryo-EM map of varicella-zoster virus glycoprotein B purified from infected cells
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 400 pix.
= 424. Å		1.06 Å/pix.
x 400 pix.
= 424. Å		1.06 Å/pix.
x 400 pix.
= 424. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.02 / Movie #1: 0.02
Minimum - Maximum-0.08331513 - 0.14840676
Average (Standard dev.)6.776161e-05 (±0.0021700847)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 423.99997 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.061.061.06
M x/y/z400400400
origin x/y/z0.0000.0000.000
length x/y/z424.000424.000424.000
α/β/γ90.00090.00090.000
start NX/NY/NZ107101134
NX/NY/NZ14113986
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS400400400
D min/max/mean-0.0830.1480.000

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Supplemental data

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Sample components

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Entire : Varicella-zoster virus glycoprotein B trimer.

EntireName: Varicella-zoster virus glycoprotein B trimer.
Components
  • Complex: Varicella-zoster virus glycoprotein B trimer.
    • Protein or peptide: Envelope glycoprotein B
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose

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Supramolecule #1: Varicella-zoster virus glycoprotein B trimer.

SupramoleculeName: Varicella-zoster virus glycoprotein B trimer. / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Details: The varicella-zoster virus glycoprotein B trimer was purified from infected MeWo cells.
Source (natural)Organism: Human alphaherpesvirus 3 (Varicella-zoster virus)

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Macromolecule #1: Envelope glycoprotein B

MacromoleculeName: Envelope glycoprotein B / type: protein_or_peptide / ID: 1 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: HHV-3 (Varicella-zoster virus)
Molecular weightTheoretical: 105.47325 KDa
SequenceString: MSPCGYYSKW RNRDRPEYRR NLRFRRFFSS IHPNAAAGSG FNGPGVFITS VTGVWLCFLC IFSMFVTAVV SVSPSSFYES LQVEPTQSE DITRSAHLGD GDEIREAIHK SQDAETKPTF YVCPPPTGST IVRLEPPRTC PDYHLGKNFT EGIAVVYKEN I AAYKFKAT ...String:
MSPCGYYSKW RNRDRPEYRR NLRFRRFFSS IHPNAAAGSG FNGPGVFITS VTGVWLCFLC IFSMFVTAVV SVSPSSFYES LQVEPTQSE DITRSAHLGD GDEIREAIHK SQDAETKPTF YVCPPPTGST IVRLEPPRTC PDYHLGKNFT EGIAVVYKEN I AAYKFKAT VYYKDVIVST AWAGSSYTQI TNRYADRVPI PVSEITDTID KFGKCSSKAT YVRNNHKVEA FNEDKNPQDM PL IASKYNS VGSKAWHTTN DTYMVAGTPG TYRTGTSVNC IIEEVEARSI FPYDSFGLST GDIIYMSPFF GLRDGAYREH SNY AMDRFH QFEGYRQRDL DTRALLEPAA RNFLVTPHLT VGWNWKPKRT EVCSLVKWRE VEDVVRDEYA HNFRFTMKTL STTF ISETN EFNLNQIHLS QCVKEEARAI INRIYTTRYN SSHVRTGDIQ TYLARGGFVV VFQPLLSNSL ARLYLQELVR ENTNH SPQK HPTRNTRSRR SVPVELRANR TITTTSSVEF AMLQFTYDHI QEHVNEMLAR ISSSWCQLQN RERALWSGLF PINPSA LAS TILDQRVKAR ILGDVISVSN CPELGSDTRI ILQNSMRVSG STTRCYSRPL ISIVSLNGSG TVEGQLGTDN ELIMSRD LL EPCVANHKRY FLFGHHYVYY EDYRYVREIA VHDVGMISTY VDLNLTLLKD REFMPLQVYT RDELRDTGLL DYSEIQRR N QMHSLRFYDI DKVVQYDSGT AIMQGMAQFF QGLGTAGQAV GHVVLGATGA LLSTVHGFTT FLSNPFGALA VGLLVLAGL VAAFFAYRYV LKLKTSPMKA LYPLTTKGLK QLPEGMDPFA EKPNATDTPI EEIGDSQNTE PSVNSGFDPD KFREAQEMIK YMTLVSAAE RQESKARKKN KTSALLTSRL TGLALRNRRG YSRVRTENVT GV

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Macromolecule #3: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 3 / Number of copies: 3 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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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: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 7.5 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: OTHER
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 349207
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE
FSC plot (resolution estimation)

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