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- PDB-7cbp: CryoEM structure of Zika virus with Fab at 4.1 Angstrom -

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Basic information

Entry
Database: PDB / ID: 7cbp
TitleCryoEM structure of Zika virus with Fab at 4.1 Angstrom
Components
  • Envelope protein E
  • Fab Heavy chain
  • Fab light chain
  • Small envelope protein M
KeywordsVIRUS / Zika virus / Fab antibody
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 / clathrin-dependent endocytosis of virus by host cell ...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 / clathrin-dependent endocytosis of virus by host cell / molecular adaptor activity / mRNA (guanine-N7)-methyltransferase / methyltransferase cap1 / methyltransferase cap1 activity / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / RNA helicase activity / protein dimerization activity / host cell perinuclear region of cytoplasm / host cell endoplasmic reticulum membrane / RNA helicase / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / symbiont-mediated activation of host autophagy / RNA-directed RNA polymerase / serine-type endopeptidase activity / viral RNA genome replication / RNA-directed RNA polymerase activity / fusion of virus membrane with host endosome membrane / viral envelope / lipid binding / centrosome / GTP binding / 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
Flavivirus capsid protein C superfamily / Flavivirus non-structural protein NS2B / 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 capsid protein C superfamily / Flavivirus non-structural protein NS2B / 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
Biological speciesHomo sapiens (human)
Zika virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.1 Å
AuthorsTyagi, A. / Ahmed, T. / Shi, J. / Bhushan, S.
Funding support1items
OrganizationGrant numberCountry
Ministry of Education (MoE, Singapore)2017-T1- 001-022 (RG34/17), MOE2017-T2-2-089
CitationJournal: J Struct Biol X / Year: 2020
Title: A complex between the Zika virion and the Fab of a broadly cross-reactive neutralizing monoclonal antibody revealed by cryo-EM and single particle analysis at 4.1 Å resolution.
Authors: Anu Tyagi / Tofayel Ahmed / Jian Shi / Shashi Bhushan /
Abstract: Zika virus (ZIKV) recently emerged as a major public health concern because it can cause fetal microcephaly and neurological disease such as the Guillain-Barré syndrome. A particularly potent class ...Zika virus (ZIKV) recently emerged as a major public health concern because it can cause fetal microcephaly and neurological disease such as the Guillain-Barré syndrome. A particularly potent class of broadly neutralizing antibodies (nAbs) targets a quaternary epitope located at the interface of two envelope proteins monomers, exposed at the surface of the mature virion. This "E-dimer-dependent epitope" (EDE), comprises the fusion loop of one monomer at the tip of domain II of E and a portion of the domains I and III of the adjacent monomer. Since this epitope largely overlaps with the binding site of the precursor membrane protein (prM) during Zika virion maturation, its molecular surface is evolutionary conserved in flaviviruses such as Dengue and Zika viruses, and can elicit antibodies that broadly neutralize various ZIKV strains. Here, we present a cryo-EM reconstruction at 4.1 Å resolution of the virion bound to the antigen binding fragment (Fab) of an antibody that targets this mutationally-constrained quaternary epitope. The Fab incompletely covers the surface of the virion as it does not bind next to its 5-fold icosahedral axes. The structure reveals details of the binding mode of this potent neutralizing class of antibodies and can inform the design of immunogens and vaccines targeting this conserved epitope.
History
DepositionJun 13, 2020Deposition site: PDBJ / Processing site: PDBJ
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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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Assembly

Deposited unit
T: Small envelope protein M
U: Small envelope protein M
V: Small envelope protein M
Q: Envelope protein E
N: Envelope protein E
K: Envelope protein E
D: Fab Heavy chain
E: Fab light chain
R: Fab Heavy chain
S: Fab light chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)283,33711
Polymers282,91310
Non-polymers4241
Water00
1
T: Small envelope protein M
U: Small envelope protein M
V: Small envelope protein M
Q: Envelope protein E
N: Envelope protein E
K: Envelope protein E
D: Fab Heavy chain
E: Fab light chain
R: Fab Heavy chain
S: Fab light chain
hetero molecules
x 60


Theoretical massNumber of molelcules
Total (without water)17,000,224660
Polymers16,974,760600
Non-polymers25,46460
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
T: Small envelope protein M
U: Small envelope protein M
V: Small envelope protein M
Q: Envelope protein E
N: Envelope protein E
K: Envelope protein E
D: Fab Heavy chain
E: Fab light chain
R: Fab Heavy chain
S: Fab light chain
hetero molecules
x 5


  • icosahedral pentamer
  • 1.42 MDa, 50 polymers
Theoretical massNumber of molelcules
Total (without water)1,416,68555
Polymers1,414,56350
Non-polymers2,1225
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation4
4
T: Small envelope protein M
U: Small envelope protein M
V: Small envelope protein M
Q: Envelope protein E
N: Envelope protein E
K: Envelope protein E
D: Fab Heavy chain
E: Fab light chain
R: Fab Heavy chain
S: Fab light chain
hetero molecules
x 6


  • icosahedral 23 hexamer
  • 1.7 MDa, 60 polymers
Theoretical massNumber of molelcules
Total (without water)1,700,02266
Polymers1,697,47660
Non-polymers2,5466
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 Small envelope protein M / 64320


Mass: 8496.883 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) Zika virus / References: UniProt: A0A024B7W1
#2: Protein Envelope protein E


Mass: 54186.762 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) Zika virus / References: UniProt: A0A024B7W1
#3: Antibody Fab Heavy chain


Mass: 23612.326 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#4: Antibody Fab light chain


Mass: 23818.539 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#5: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
Has ligand of interestN
Has protein modificationY

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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

Component
IDNameTypeEntity IDParent-IDSource
1Zika virusCOMPLEX#1-#40MULTIPLE SOURCES
2Zika virus M and E proteinsCOMPLEX#1-#21NATURAL
3FABCOMPLEX#3-#41RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
12Zika virus64320
23Homo sapiens (human)9606
Details of virusEmpty: YES / Enveloped: YES / Isolate: OTHER / Type: VIRION
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
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: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 48 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k)

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Processing

EM softwareName: RELION / Category: classification
CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 4610 / Symmetry type: POINT

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