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- PDB-7x35: Cryo-EM structure of Coxsackievirus B1 A-particle in complex with... -

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Basic information

Entry
Database: PDB / ID: 7x35
TitleCryo-EM structure of Coxsackievirus B1 A-particle in complex with nAb 8A10 (CVB1-A:8A10)
Components
  • 8A10 heavy chain
  • 8A10 light chain
  • VP2
  • VP3
  • Virion protein 1
KeywordsVIRUS / Coxsackievirus B1 / Neutralizing antibody / Cryo-EM
Function / homology
Function and homology information


symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of RIG-I activity / picornain 2A / symbiont-mediated suppression of host mRNA export from nucleus / symbiont genome entry into host cell via pore formation in plasma membrane / picornain 3C / T=pseudo3 icosahedral viral capsid / host cell cytoplasmic vesicle membrane / cytoplasmic vesicle membrane / endocytosis involved in viral entry into host cell / nucleoside-triphosphate phosphatase ...symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of RIG-I activity / picornain 2A / symbiont-mediated suppression of host mRNA export from nucleus / symbiont genome entry into host cell via pore formation in plasma membrane / picornain 3C / T=pseudo3 icosahedral viral capsid / host cell cytoplasmic vesicle membrane / cytoplasmic vesicle membrane / endocytosis involved in viral entry into host cell / nucleoside-triphosphate phosphatase / channel activity / monoatomic ion transmembrane transport / DNA replication / RNA helicase activity / induction by virus of host autophagy / symbiont entry into host cell / RNA-directed RNA polymerase / viral RNA genome replication / cysteine-type endopeptidase activity / RNA-dependent RNA polymerase activity / virus-mediated perturbation of host defense response / DNA-templated transcription / host cell nucleus / virion attachment to host cell / structural molecule activity / ATP hydrolysis activity / proteolysis / RNA binding / ATP binding / metal ion binding
Similarity search - Function
Picornavirus coat protein VP4 superfamily / Poliovirus 3A protein-like / Poliovirus 3A protein like / Picornavirus 2B protein / Poliovirus core protein 3a, soluble domain / Picornavirus 2B protein / Peptidase C3, picornavirus core protein 2A / Picornavirus core protein 2A / Picornavirus coat protein VP4 / Picornavirus coat protein (VP4) ...Picornavirus coat protein VP4 superfamily / Poliovirus 3A protein-like / Poliovirus 3A protein like / Picornavirus 2B protein / Poliovirus core protein 3a, soluble domain / Picornavirus 2B protein / Peptidase C3, picornavirus core protein 2A / Picornavirus core protein 2A / Picornavirus coat protein VP4 / Picornavirus coat protein (VP4) / Peptidase C3A/C3B, picornaviral / 3C cysteine protease (picornain 3C) / Picornavirales 3C/3C-like protease domain / Picornavirales 3C/3C-like protease domain profile. / Picornavirus capsid / picornavirus capsid protein / Helicase, superfamily 3, single-stranded RNA virus / Superfamily 3 helicase of positive ssRNA viruses domain profile. / Helicase, superfamily 3, single-stranded DNA/RNA virus / RNA helicase / Picornavirus/Calicivirus coat protein / Viral coat protein subunit / RNA-directed RNA polymerase, C-terminal domain / Viral RNA-dependent RNA polymerase / Reverse transcriptase/Diguanylate cyclase domain / RNA-directed RNA polymerase, catalytic domain / RdRp of positive ssRNA viruses catalytic domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / Peptidase S1, PA clan, chymotrypsin-like fold / Peptidase S1, PA clan / DNA/RNA polymerase superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Genome polyprotein / Genome polyprotein / Genome polyprotein
Similarity search - Component
Biological speciesCoxsackievirus B1
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.19 Å
AuthorsZheng, Q. / Zhu, R. / Sun, H. / Cheng, T. / Li, S. / Xia, N.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Cell Host Microbe / Year: 2022
Title: Structural basis for the synergistic neutralization of coxsackievirus B1 by a triple-antibody cocktail.
Authors: Qingbing Zheng / Rui Zhu / Zhichao Yin / Longfa Xu / Hui Sun / Hai Yu / Yuanyuan Wu / Yichao Jiang / Qiongzi Huang / Yang Huang / Dongqing Zhang / Liqin Liu / Hongwei Yang / Maozhou He / ...Authors: Qingbing Zheng / Rui Zhu / Zhichao Yin / Longfa Xu / Hui Sun / Hai Yu / Yuanyuan Wu / Yichao Jiang / Qiongzi Huang / Yang Huang / Dongqing Zhang / Liqin Liu / Hongwei Yang / Maozhou He / Zhenhong Zhou / Yanan Jiang / Zhenqin Chen / Huan Zhao / Yuqiong Que / Zhibo Kong / Lizhi Zhou / Tingting Li / Jun Zhang / Wenxin Luo / Ying Gu / Tong Cheng / Shaowei Li / Ningshao Xia /
Abstract: Coxsackievirus B1 (CVB1) is an emerging pathogen associated with severe neonatal diseases including aseptic meningitis, myocarditis, and pancreatitis and also with the development of type 1 diabetes. ...Coxsackievirus B1 (CVB1) is an emerging pathogen associated with severe neonatal diseases including aseptic meningitis, myocarditis, and pancreatitis and also with the development of type 1 diabetes. We characterize the binding and therapeutic efficacies of three CVB1-specific neutralizing antibodies (nAbs) identified for their ability to inhibit host receptor engagement. High-resolution cryo-EM structures showed that these antibodies recognize different epitopes but with an overlapping region in the capsid VP2 protein and specifically the highly variable EF loop. Moreover, they perturb capsid-receptor interactions by binding various viral particle forms. Antibody combinations achieve synergetic neutralization via a stepwise capsid transition and virion disruption, indicating dynamic changes in the virion in response to multiple nAbs targeting the receptor-binding site. Furthermore, this three-antibody cocktail protects against lethal challenge in neonatal mice and limits pancreatitis and viral replication in a non-obese diabetic mouse model. These results illustrate the utility of nAbs for rational design of therapeutics against picornaviruses such as CVB.
History
DepositionFeb 28, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jul 24, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Virion protein 1
B: VP2
C: VP3
H: 8A10 heavy chain
L: 8A10 light chain


Theoretical massNumber of molelcules
Total (without water)111,9285
Polymers111,9285
Non-polymers00
Water00
1
A: Virion protein 1
B: VP2
C: VP3
H: 8A10 heavy chain
L: 8A10 light chain
x 60


Theoretical massNumber of molelcules
Total (without water)6,715,659300
Polymers6,715,659300
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: Virion protein 1
B: VP2
C: VP3
H: 8A10 heavy chain
L: 8A10 light chain
x 5


  • icosahedral pentamer
  • 560 kDa, 25 polymers
Theoretical massNumber of molelcules
Total (without water)559,63825
Polymers559,63825
Non-polymers00
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation4
4
A: Virion protein 1
B: VP2
C: VP3
H: 8A10 heavy chain
L: 8A10 light chain
x 6


  • icosahedral 23 hexamer
  • 672 kDa, 30 polymers
Theoretical massNumber of molelcules
Total (without water)671,56630
Polymers671,56630
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 Virion protein 1 / VP1 / P1C / P1D


Mass: 31207.117 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Coxsackievirus B1 / References: UniProt: W8GTF7
#2: Protein VP2


Mass: 29122.744 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Coxsackievirus B1 / References: UniProt: A0A2S0RQC2
#3: Protein VP3


Mass: 26328.764 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Coxsackievirus B1
References: UniProt: L7UV52, picornain 2A, nucleoside-triphosphate phosphatase, picornain 3C, RNA-directed RNA polymerase
#4: Antibody 8A10 heavy chain


Mass: 13323.863 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Mus musculus (house mouse)
#5: Antibody 8A10 light chain


Mass: 11945.163 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Mus musculus (house mouse)

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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: Coxsackievirus B1 / Type: VIRUS / Entity ID: #5, #4, #1-#3 / Source: NATURAL
Source (natural)Organism: Coxsackievirus B1
Details of virusEmpty: NO / Enveloped: YES / Isolate: STRAIN / Type: VIRION
Buffer solutionpH: 7.4
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: Tecnai F30 / Image courtesy: FEI Company
MicroscopyModel: FEI TECNAI F30
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3300 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 60 e/Å2 / Detector mode: COUNTING / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.14_3259: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.19 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 53960 / Symmetry type: POINT

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