5EO0 image
Deposition Date 2015-11-10
Release Date 2016-02-24
Last Version Date 2024-11-06
Entry Detail
PDB ID:
5EO0
Keywords:
Title:
Crystal Structure of HLA-B0702-RFL9
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.70 Å
R-Value Free:
0.21
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:HLA class I histocompatibility antigen, B-7 alpha chain
Gene (Uniprot):HLA-B
Chain IDs:A
Chain Length:275
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Beta-2-microglobulin
Gene (Uniprot):B2M
Chain IDs:B
Chain Length:100
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:RFL9 peptide
Chain IDs:C
Chain Length:9
Number of Molecules:1
Biological Source:synthetic construct
Primary Citation
HIV-1-Specific CD8 T Cells Exhibit Limited Cross-Reactivity during Acute Infection.
J Immunol. 196 3276 3286 (2016)
PMID: 26983786 DOI: 10.4049/jimmunol.1502411

Abstact

Prior work has demonstrated that HIV-1-specific CD8 T cells can cross-recognize variant epitopes. However, most of these studies were performed in the context of chronic infection, where the presence of viral quasispecies makes it difficult to ascertain the true nature of the original antigenic stimulus. To overcome this limitation, we evaluated the extent of CD8 T cell cross-reactivity in patients with acute HIV-1 clade B infection. In each case, we determined the transmitted founder virus sequence to identify the autologous epitopes restricted by individual HLA class I molecules. Our data show that cross-reactive CD8 T cells are infrequent during the acute phase of HIV-1 infection. Moreover, in the uncommon instances where cross-reactive responses were detected, the variant epitopes were poorly recognized in cytotoxicity assays. Molecular analysis revealed that similar antigenic structures could be cross-recognized by identical CD8 T cell clonotypes mobilized in vivo, yet even subtle differences in a single TCR-accessible peptide residue were sufficient to disrupt variant-specific reactivity. These findings demonstrate that CD8 T cells are highly specific for autologous epitopes during acute HIV-1 infection. Polyvalent vaccines may therefore be required to provide optimal immune cover against this genetically labile pathogen.

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