9E7Z

Canine parvovirus subtype 2a empty capsid in complex with Fab fragments of Mab 3G6


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.02 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structures and functions of the limited natural polyclonal antibody response to parvovirus infection.

Adu, O.F.Lee, H.Fruh, S.P.Schoenle, M.V.Weichert, W.S.Flyak, A.I.Hafenstein, S.L.Parrish, C.R.

(2025) Proc Natl Acad Sci U S A 122: e2423460122-e2423460122

  • DOI: https://doi.org/10.1073/pnas.2423460122
  • Primary Citation of Related Structures:  
    9E60, 9E7W, 9E7X, 9E7Z, 9E80, 9E89, 9E8D

  • PubMed Abstract: 

    Host antibody responses are key components in the protection of animals against pathogens, yet the defining properties of viral antigens and induction of B cell responses that result in varied protection are still poorly understood. Parvoviruses are simple molecular structures that display 60 repeated motifs on their capsid surface, and rapidly induce strong antibody responses that protect animals from infection. We recently showed that following canine parvovirus infection of its natural host, the polyclonal response in the sera contained only two or three dominant antibodies that bound two epitopes on the capsid. Here, we characterize key antibodies present in that immune response, identifying their sequences, defining their binding properties on the capsid by cryoelectron microscopic (cryoEM) analysis, and testing their effects on viral infectivity. Two antibodies sharing the same heavy chain bound to the side of the capsid threefold spike (B-site), while another distinct antibody bound close to the threefold axis (A-site). The epitopes of these antibodies overlapped the binding site of the host receptor, the transferrin receptor type-1, but to varying degrees. The antibodies varied widely in their neutralization efficiencies as either immunoglobulins (IgGs) or monomeric antigen-binding fragments (Fabs), which was consistent with their ability to compete for the receptor. The monoclonal antibodies characterized here matched the structures from the cryoEM analysis of polyclonal sera, including those present in a different dog than the monoclonal source. This shows that after infection, a focused response to the viral antigen is produced that protects against infection.


  • Organizational Affiliation

    Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Capsid protein 2548Canis lupus familiarisMutation(s): 0 
Gene Names: VP2VP-2vp2
UniProt
Find proteins for Q66208 (Canine parvovirus type 2)
Explore Q66208 
Go to UniProtKB:  Q66208
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ66208
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.02 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2025-01-29
    Type: Initial release
  • Version 1.1: 2025-02-26
    Changes: Data collection, Database references