8EUQ image
Deposition Date 2022-10-19
Release Date 2023-04-19
Last Version Date 2024-10-09
Entry Detail
PDB ID:
8EUQ
Keywords:
Title:
Crystal structure of HLA-DRA*01:01/HLA-DRB1*04:01 in complex with c44H10 Fab
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Influenza A virus (Taxon ID: 11320)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.09 Å
R-Value Free:
0.24
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
I 2 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:HLA class II histocompatibility antigen, DR alpha chain
Gene (Uniprot):HLA-DRA
Chain IDs:A, C (auth: F)
Chain Length:188
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Hemagglutinin HA1 chain,HLA class II histocompatibility antigen DR beta chain
Gene (Uniprot):HLA-DRB1, HA
Mutations:A3G, C4A in the hemagglutinin peptide that was used
Chain IDs:E (auth: B), G
Chain Length:226
Number of Molecules:2
Biological Source:Influenza A virus, Homo sapiens
Polymer Type:polypeptide(L)
Molecule:c44H10 Fab heavy chain
Chain IDs:F (auth: C), H (auth: I)
Chain Length:223
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:c44H10 Fab light chain
Chain IDs:B (auth: D), D (auth: H)
Chain Length:214
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Modular adjuvant-free pan-HLA-DR-immunotargeting subunit vaccine against SARS-CoV-2 elicits broad sarbecovirus-neutralizing antibody responses.
Cell Rep 42 112391 112391 (2023)
PMID: 37053069 DOI: 10.1016/j.celrep.2023.112391

Abstact

Subunit vaccines typically require co-administration with an adjuvant to elicit protective immunity, adding development hurdles that can impede rapid pandemic responses. To circumvent the need for adjuvant in a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) subunit vaccine, we engineer a thermostable immunotargeting vaccine (ITV) that leverages the pan-HLA-DR monoclonal antibody 44H10 to deliver the viral spike protein receptor-binding domain (RBD) to antigen-presenting cells. X-ray crystallography shows that 44H10 binds to a conserved epitope on HLA-DR, providing the basis for its broad HLA-DR reactivity. Adjuvant-free ITV immunization in rabbits and ferrets induces robust anti-RBD antibody responses that neutralize SARS-CoV-2 variants of concern and protect recipients from SARS-CoV-2 challenge. We demonstrate that the modular nature of the ITV scaffold with respect to helper T cell epitopes and diverse RBD antigens facilitates broad sarbecovirus neutralization. Our findings support anti-HLA-DR immunotargeting as an effective means to induce strong antibody responses to subunit antigens without requiring an adjuvant.

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Primary Citation of related structures