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- PDB-9rih: EV-A71 (genotype B2) in complex with 16-2-12D Fab -

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Basic information

Entry
Database: PDB / ID: 9rih
TitleEV-A71 (genotype B2) in complex with 16-2-12D Fab
Components
  • (Genome polyprotein) x 3
  • 16-2-12D heavy chain
  • Capsid protein
  • IgG L chain
KeywordsVIRUS / Hand-foot-and-mouth disease / HFMD / enterovirus 71 (EV-A71) / Human antibody / 16-2-12D
Function / homology
Function and homology information


immunoglobulin complex / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MDA-5 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 / viral capsid / ribonucleoside triphosphate phosphatase activity ...immunoglobulin complex / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MDA-5 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 / viral capsid / ribonucleoside triphosphate phosphatase activity / nucleoside-triphosphate phosphatase / channel activity / monoatomic ion transmembrane transport / adaptive immune response / DNA replication / RNA helicase activity / endocytosis involved in viral entry into host cell / symbiont-mediated activation of host autophagy / RNA-directed RNA polymerase / cysteine-type endopeptidase activity / viral RNA genome replication / RNA-directed RNA polymerase activity / DNA-templated transcription / virion attachment to host cell / host cell nucleus / structural molecule activity / proteolysis / RNA binding / extracellular region / zinc ion binding / ATP binding / plasma membrane
Similarity search - Function
Picornavirus coat protein VP4 superfamily / : / : / Picornavirus coat protein / 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 coat protein VP4 superfamily / : / : / Picornavirus coat protein / 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) / Immunoglobulin V-Type / Peptidase C3A/C3B, picornaviral / 3C cysteine protease (picornain 3C) / Immunoglobulin V-set domain / 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 / Immunoglobulin V-set domain / Picornavirus/Calicivirus coat protein / Viral coat protein subunit / Immunoglobulin/major histocompatibility complex, conserved site / Immunoglobulins and major histocompatibility complex proteins signature. / Immunoglobulin subtype / Immunoglobulin / Immunoglobulin C-Type / Immunoglobulin C1-set / Immunoglobulin C1-set domain / Reverse transcriptase/Diguanylate cyclase domain / RNA-directed RNA polymerase, C-terminal domain / Viral RNA-dependent RNA polymerase / Ig-like domain profile. / Immunoglobulin-like domain / Immunoglobulin-like domain superfamily / 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 / Immunoglobulin-like fold / 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
SPHINGOSINE / Genome polyprotein / Genome polyprotein / Capsid protein / Genome polyprotein / IgG L chain
Similarity search - Component
Biological speciesHomo sapiens (human)
Chlorocebus aethiops (grivet monkey)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsZhou, D. / Ren, J. / Stuart, D.I.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
Medical Research Council (MRC, United Kingdom)MR/N00065X/1 United Kingdom
CitationJournal: Sci Adv / Year: 2026
Title: Structural and functional mapping of protective human monoclonal antibodies against enterovirus A71.
Authors: Daming Zhou / Abhay Kotecha / James T Kelly / Peng-Nien Huang / Yi-Yin Chen / Thomas S Walter / Helen M E Duyvesteyn / Raymond J Owens / Shu-Yuan Ho / Tzou-Yien Lin / Elizabeth E Fry / ...Authors: Daming Zhou / Abhay Kotecha / James T Kelly / Peng-Nien Huang / Yi-Yin Chen / Thomas S Walter / Helen M E Duyvesteyn / Raymond J Owens / Shu-Yuan Ho / Tzou-Yien Lin / Elizabeth E Fry / Jingshan Ren / Kuan-Ying A Huang / David I Stuart /
Abstract: EV-A71 has been responsible for recent severe HFMD outbreaks. We report structures for 12 potently neutralizing human anti-EV-A71 monoclonal antibody Fabs, alone and complexed with virus. Most ...EV-A71 has been responsible for recent severe HFMD outbreaks. We report structures for 12 potently neutralizing human anti-EV-A71 monoclonal antibody Fabs, alone and complexed with virus. Most recognize the native antigenic state with epitopes that span interfaces, together covering 85% of the capsid surface. The majority (8 of 12) bind the canyon, while the others cluster around the icosahedral two- and threefold axes. Blocking SCARB2 receptor binding likely contributes to neutralization for all, and a subset induces empty particles. A predominant gene family (IGHV4-39) does not dictate a common binding pose. Long CDR-H3 loops are frequently key to binding, especially at the canyon, suggesting that antigenicity data based on antibodies with shorter CDR3s (e.g., murine) may be misleading. This dataset reveals neutralization mechanisms for recently circulating EV-A71 genotypes, which will inform immunotherapies. We demonstrate synergy in vitro between canyon binding and both two- and threefold binding antibodies to increase neutralization potency.
History
DepositionJun 11, 2025Deposition site: PDBE / Processing site: PDBE
Revision 1.0Apr 29, 2026Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Genome polyprotein
B: Genome polyprotein
C: Genome polyprotein
D: Capsid protein
L: IgG L chain
H: 16-2-12D heavy chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)143,2957
Polymers142,9956
Non-polymers2991
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Protein , 4 types, 4 molecules ABCD

#1: Protein Genome polyprotein


Mass: 32781.805 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlorocebus aethiops (grivet monkey)
References: UniProt: A0A2L1GIK5, picornain 2A, nucleoside-triphosphate phosphatase, picornain 3C, RNA-directed RNA polymerase
#2: Protein Genome polyprotein


Mass: 26918.305 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlorocebus aethiops (grivet monkey)
References: UniProt: E5RPG5, picornain 2A, nucleoside-triphosphate phosphatase, picornain 3C, RNA-directed RNA polymerase
#3: Protein Genome polyprotein


Mass: 26540.332 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlorocebus aethiops (grivet monkey)
References: UniProt: A0A0E3SXU7, picornain 2A, nucleoside-triphosphate phosphatase, picornain 3C, RNA-directed RNA polymerase
#4: Protein Capsid protein


Mass: 7501.162 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Chlorocebus aethiops (grivet monkey) / References: UniProt: A8TPY9

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Antibody , 2 types, 2 molecules LH

#5: Antibody IgG L chain


Mass: 22835.199 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293T / Production host: Homo sapiens (human) / References: UniProt: S6BGD6
#6: Antibody 16-2-12D heavy chain


Mass: 26418.529 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)

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Non-polymers , 1 types, 1 molecules

#7: Chemical ChemComp-SPH / SPHINGOSINE


Mass: 299.492 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C18H37NO2

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Details

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
1EV-A71 Virus and 16-2-12D Fab complexCOMPLEX#1-#60MULTIPLE SOURCES
216-2-12D FabCOMPLEX#5-#61RECOMBINANT
3EV-A71COMPLEX#1-#41NATURAL
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
21Enterovirus A7139054
32Homo sapiens (human)9606
43Enterovirus A7139054
Source (recombinant)Organism: Homo sapiens (human)
Details of virusEmpty: NO / Enveloped: NO / Isolate: STRAIN / Type: VIRION
Natural hostOrganism: Homo sapiens
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 Polara / Image courtesy: FEI Company
MicroscopyModel: FEI POLARA 300
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 30 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 16774 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
RefinementHighest resolution: 3.1 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)

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