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- PDB-9iyi: VLP structure of Chikungunya virus complexed with C34 Fab, 2f block. -

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Basic information

Entry
Database: PDB / ID: 9iyi
TitleVLP structure of Chikungunya virus complexed with C34 Fab, 2f block.
Components
  • C34 Fab, Heavy Chain
  • C34 Fab, Light Chain
  • CHIKV E1
  • CHIKV capsid protein
  • Structural polyprotein
KeywordsVIRUS LIKE PARTICLE / chikungunya / alphavirus / antibody
Function / homology
Function and homology information


T=4 icosahedral viral capsid / host cell cytoplasm / serine-type endopeptidase activity / fusion of virus membrane with host endosome membrane / symbiont entry into host cell / virion attachment to host cell / host cell nucleus / host cell plasma membrane / virion membrane / structural molecule activity ...T=4 icosahedral viral capsid / host cell cytoplasm / serine-type endopeptidase activity / fusion of virus membrane with host endosome membrane / symbiont entry into host cell / virion attachment to host cell / host cell nucleus / host cell plasma membrane / virion membrane / structural molecule activity / proteolysis / RNA binding / membrane
Similarity search - Function
Alphavirus E2 glycoprotein, domain B / Peptidase S3, togavirin / Alphavirus E2 glycoprotein / Alphavirus E3 spike glycoprotein / Alphavirus E1 glycoprotein / Alphavirus E2 glycoprotein, domain A / Alphavirus E2 glycoprotein, domain C / Alphavirus E2 glycoprotein / Alphavirus core protein / Alphavirus E3 glycoprotein ...Alphavirus E2 glycoprotein, domain B / Peptidase S3, togavirin / Alphavirus E2 glycoprotein / Alphavirus E3 spike glycoprotein / Alphavirus E1 glycoprotein / Alphavirus E2 glycoprotein, domain A / Alphavirus E2 glycoprotein, domain C / Alphavirus E2 glycoprotein / Alphavirus core protein / Alphavirus E3 glycoprotein / Alphavirus E1 glycoprotein / Alphavirus core protein (CP) domain profile. / Flavivirus/Alphavirus glycoprotein, immunoglobulin-like domain superfamily / Flavivirus glycoprotein, central and dimerisation domain superfamily / Flaviviral glycoprotein E, dimerisation domain / Immunoglobulin E-set / Peptidase S1, PA clan, chymotrypsin-like fold / Peptidase S1, PA clan
Similarity search - Domain/homology
CHOLESTEROL / Structural polyprotein / Structural polyprotein / Structural polyprotein
Similarity search - Component
Biological speciesHomo sapiens (human)
Chikungunya virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.73 Å
AuthorsHan, X. / Ji, C. / Wang, F. / Tian, S. / Gao, F.G. / Yan, J.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nat Commun / Year: 2025
Title: Neutralizing antibodies against Chikungunya virus and structural elucidation of their mechanism of action.
Authors: Xiaonan Han / Chengfan Ji / Siyu Tian / Fengze Wang / Guo-Ping Cao / Ding Li / Xiaomin Duan / Zhou Tong / Jianxun Qi / Qihui Wang / Qingrui Huang / Bing-Dong Zhan / George Fu Gao / Jinghua Yan /
Abstract: Chikungunya virus (CHIKV) is a mosquito-borne alphavirus that causes febrile illness and acute or chronic arthritis. Most therapeutics are still in the pre-clinical stage. In this study, we report ...Chikungunya virus (CHIKV) is a mosquito-borne alphavirus that causes febrile illness and acute or chronic arthritis. Most therapeutics are still in the pre-clinical stage. In this study, we report the isolation of two neutralizing antibodies, C34 and C37, from a convalescent patient and investigate their mechanisms of action. Both C34 and C37 exhibit high neutralizing activities in vitro and demonstrate protective effects against CHIKV in a female mouse model. Our functional and structural studies reveal a mechanism that inhibits multiple stages of the virus infection cycle. Both antibodies bind with high affinity to an epitope spanning E2, E1, and the connecting β-strands, facilitating intra- and inter-virion crosslinking. Cryo-EM structures additionally identify a minor patch located beneath the E3 binding site on E2, which is allosterically exposed upon E3 dissociation during virus maturation. Functional and structural data further suggest that binding to the CHIKV receptor, Mxra8, is obstructed due to a clash between the antibodies and the stalk region of Mxra8. Our results highlight the potential of antibody-based therapeutics against CHIKV and elucidate the mechanisms of monoclonal antibody protection.
History
DepositionJul 30, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Nov 12, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
S: C34 Fab, Heavy Chain
T: C34 Fab, Light Chain
A: CHIKV E1
B: CHIKV E1
C: CHIKV E1
D: CHIKV E1
E: Structural polyprotein
F: Structural polyprotein
G: Structural polyprotein
H: Structural polyprotein
I: CHIKV capsid protein
J: CHIKV capsid protein
K: CHIKV capsid protein
L: CHIKV capsid protein
Q: C34 Fab, Heavy Chain
R: C34 Fab, Light Chain
O: C34 Fab, Heavy Chain
P: C34 Fab, Light Chain
M: C34 Fab, Heavy Chain
N: C34 Fab, Light Chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)667,53729
Polymers662,47320
Non-polymers5,0649
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 , 3 types, 12 molecules ABCDEFGHIJKL

#3: Protein
CHIKV E1 / p130


Mass: 47446.906 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chikungunya virus / Production host: Homo sapiens (human) / References: UniProt: A0A286S4J4
#4: Protein
Structural polyprotein / p130


Mass: 46909.578 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chikungunya virus / Gene: CHIKVgp2 / Production host: Homo sapiens (human) / References: UniProt: D7R9A2
#5: Protein
CHIKV capsid protein / Togavirin


Mass: 16428.607 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Chikungunya virus / Production host: Homo sapiens (human) / References: UniProt: A0A6B9KBE1, togavirin

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Antibody , 2 types, 8 molecules SQOMTRPN

#1: Antibody
C34 Fab, Heavy Chain


Mass: 28360.697 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#2: Antibody
C34 Fab, Light Chain


Mass: 26472.525 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)

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Sugars , 5 types, 5 molecules

#6: Polysaccharide alpha-D-mannopyranose-(1-3)-[beta-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-4)-2-acetamido-2- ...alpha-D-mannopyranose-(1-3)-[beta-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 1056.964 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-3[DManpb1-6]DManpa1-4DGlcpNAcb1-4[LFucpa1-6]DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/4,6,5/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1a_1-5][a1122h-1b_1-5][a1221m-1a_1-5]/1-1-2-2-3-4/a4-b1_a6-f1_b4-c1_c3-d1_c6-e1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][a-D-GlcpNAc]{[(4+1)][a-D-GlcpNAc]{[(4+1)][a-D-Manp]{[(3+1)][a-D-Manp]{}[(6+1)][b-D-Manp]{}}}[(6+1)][a-L-Fucp]{}}}LINUCSPDB-CARE
#7: Polysaccharide alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1- ...alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 732.682 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-4DGlcpNAcb1-4[LFucpa1-6]DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,4,3/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1a_1-5][a1221m-1a_1-5]/1-1-2-3/a4-b1_a6-d1_b4-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][a-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][a-D-Manp]{}}[(6+1)][b-L-Fucp]{}}}LINUCSPDB-CARE
#8: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 570.542 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4[LFucpa1-6]DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1221m-1a_1-5]/1-1-2/a4-b1_a6-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][a-D-GlcpNAc]{}[(6+1)][a-L-Fucp]{}}}LINUCSPDB-CARE
#9: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 732.682 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4[LFucpa1-6]DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/3,4,3/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5][a1221m-1a_1-5]/1-1-2-3/a4-b1_a6-d1_b4-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][a-D-GlcpNAc]{[(4+1)][a-D-Manp]{}}[(6+1)][a-L-Fucp]{}}}LINUCSPDB-CARE
#10: 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-Glycam 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
[]{[(4+1)][a-D-GlcpNAc]{[(4+1)][a-D-GlcpNAc]{}}}LINUCSPDB-CARE

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Non-polymers , 1 types, 4 molecules

#11: Chemical
ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C27H46O

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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

ComponentName: CHIKV VLP / Type: COMPLEX / Entity ID: #1-#5 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Chikungunya virus
Source (recombinant)Organism: Homo sapiens (human)
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 / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 3.73 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 491507 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model building
IDPDB-ID 3D fitting-IDAccession codeInitial refinement model-IDSource nameType
18FCG

8fcg

18FCG1PDBexperimental model
26JO8

6jo8

16JO82PDBexperimental model

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