5EO1

Crystal Structure of HLA-B0702-RL9

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.204 

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This is version 1.2 of the entry. See complete history. 


Literature

HIV-1-Specific CD8 T Cells Exhibit Limited Cross-Reactivity during Acute Infection.

Du, V.Y., Bansal, A., Carlson, J., Salazar-Gonzalez, J.F., Salazar, M.G., Ladell, K., Gras, S., Josephs, T.M., Heath, S.L., Price, D.A., Rossjohn, J., Hunter, E., Goepfert, P.A.

(2016) J Immunol 196: 3276-3286

  • DOI: 10.4049/jimmunol.1502411
  • Primary Citation of Related Structures:  
    5EO0, 5EO1

  • PubMed Abstract: 

    • 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 ascert ...

    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.

    Organizational Affiliation: 

    Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294; paulg@uab.edu.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class I histocompatibility antigen, B-7 alpha chainA275Homo sapiensMutation(s): 0 
Gene Names: HLA-B, HLAB
Find proteins for P01889 (Homo sapiens)
Explore P01889 
Go to UniProtKB:  P01889
NIH Common Fund Data Resources
PHAROS  P01889
GTEx  ENSG00000234745
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB100Homo sapiensMutation(s): 0 
Gene Names: B2M, CDABP0092, HDCMA22P
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS  P61769
GTEx  ENSG00000166710
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
RL9 peptideC9synthetic constructMutation(s): 0 
Find proteins for P12478 (Human immunodeficiency virus type 1 group M subtype D (isolate Z2/CDC-Z34))
Explore P12478 
Go to UniProtKB:  P12478
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.204 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.662α = 90
b = 81.857β = 90
c = 110.366γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-02-24
    Type: Initial release
  • Version 1.1: 2016-03-30
    Changes: Database references
  • Version 1.2: 2016-04-20
    Changes: Database references