8DEC image
Entry Detail
PDB ID:
8DEC
EMDB ID:
Title:
Cryo-EM Structure of Western Equine Encephalitis Virus
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2022-06-20
Release Date:
2023-07-05
Method Details:
Experimental Method:
Resolution:
4.70 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Spike glycoprotein E1
Chain IDs:A, D (auth: F), G (auth: J), J (auth: N)
Chain Length:439
Number of Molecules:4
Biological Source:Western equine encephalitis virus
Polymer Type:polypeptide(L)
Description:Spike glycoprotein E2
Chain IDs:B, E (auth: G), H (auth: K), K (auth: O)
Chain Length:418
Number of Molecules:4
Biological Source:Western equine encephalitis virus
Polymer Type:polypeptide(L)
Description:Capsid protein
Chain IDs:C (auth: E), F (auth: I), I (auth: M), L (auth: R)
Chain Length:259
Number of Molecules:4
Biological Source:Western equine encephalitis virus
Ligand Molecules
Primary Citation

Abstact

Alphaviruses are RNA viruses that represent emerging public health threats. To identify protective antibodies, we immunized macaques with a mixture of western, eastern, and Venezuelan equine encephalitis virus-like particles (VLPs), a regimen that protects against aerosol challenge with all three viruses. Single- and triple-virus-specific antibodies were isolated, and we identified 21 unique binding groups. Cryo-EM structures revealed that broad VLP binding inversely correlated with sequence and conformational variability. One triple-specific antibody, SKT05, bound proximal to the fusion peptide and neutralized all three Env-pseudotyped encephalitic alphaviruses by using different symmetry elements for recognition across VLPs. Neutralization in other assays (e.g., chimeric Sindbis virus) yielded variable results. SKT05 bound backbone atoms of sequence-diverse residues, enabling broad recognition despite sequence variability; accordingly, SKT05 protected mice against Venezuelan equine encephalitis virus, chikungunya virus, and Ross River virus challenges. Thus, a single vaccine-elicited antibody can protect in vivo against a broad range of alphaviruses.

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Protein

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Disease

Primary Citation of related structures