5KD7

Crystal Structure of Murine MHC-I H-2Dd in complex with Murine Beta2-Microglobulin and a Variant of Peptide (PV9) of HIV gp120 MN Isolate (IGPGRAFYV)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Effects of Cross-Presentation, Antigen Processing, and Peptide Binding in HIV Evasion of T Cell Immunity.

Frey, B.F.Jiang, J.Sui, Y.Boyd, L.F.Yu, B.Tatsuno, G.Billeskov, R.Solaymani-Mohammadi, S.Berman, P.W.Margulies, D.H.Berzofsky, J.A.

(2018) J Immunol 200: 1853-1864

  • DOI: 10.4049/jimmunol.1701523
  • Primary Citation of Related Structures:  
    5KD4, 5KD7, 5T7G

  • PubMed Abstract: 
  • Unlike cytosolic processing and presentation of viral Ags by virus-infected cells, Ags first expressed in infected nonprofessional APCs, such as CD4 + T cells in the case of HIV, are taken up by dendritic cells and cross-presented. This generally requires entry through the endocytic pathway, where endosomal proteases have first access for processing ...

    Unlike cytosolic processing and presentation of viral Ags by virus-infected cells, Ags first expressed in infected nonprofessional APCs, such as CD4 + T cells in the case of HIV, are taken up by dendritic cells and cross-presented. This generally requires entry through the endocytic pathway, where endosomal proteases have first access for processing. Thus, understanding virus escape during cross-presentation requires an understanding of resistance to endosomal proteases, such as cathepsin S (CatS). We have modified HIV-1 MN gp120 by mutating a key CatS cleavage site (Thr 322 Thr 323 ) in the V3 loop of the immunodominant epitope IGPGRAFY TT to IGPGRAFY VV to prevent digestion. We found this mutation to facilitate cross-presentation and provide evidence from MHC binding and X-ray crystallographic structural studies that this results from preservation of the epitope rather than an increased epitope affinity for the MHC class I molecule. In contrast, when the protein is expressed by a vaccinia virus in the cytosol, the wild-type protein is immunogenic without this mutation. These proof-of-concept results show that a virus like HIV, infecting predominantly nonprofessional presenting cells, can escape T cell recognition by incorporating a CatS cleavage site that leads to destruction of an immunodominant epitope when the Ag undergoes endosomal cross-presentation.


    Organizational Affiliation

    Vaccine Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
H-2 class I histocompatibility antigen, D-D alpha chainA, D [auth C], G [auth F], J [auth I]275Mus musculusMutation(s): 0 
Gene Names: H2-D1
UniProt
Find proteins for P01900 (Mus musculus)
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Go to UniProtKB:  P01900
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB, E [auth D], H [auth G], K [auth J]100Mus musculusMutation(s): 0 
Gene Names: B2m
UniProt & NIH Common Fund Data Resources
Find proteins for P01887 (Mus musculus)
Explore P01887 
Go to UniProtKB:  P01887
IMPC:  MGI:88127
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Peptide (PV9) of HIV gp120 MN isolate (IGPGRAFYV)F [auth E], I [auth H], L [auth K], C [auth P]9HIV-1 M:B_MNMutation(s): 0 
Gene Names: env
UniProt
Find proteins for P05877 (Human immunodeficiency virus type 1 group M subtype B (isolate MN))
Explore P05877 
Go to UniProtKB:  P05877
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.42α = 93.52
b = 75.36β = 87.14
c = 120.03γ = 96.5
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-10-11
    Type: Initial release
  • Version 1.1: 2018-02-07
    Changes: Database references
  • Version 1.2: 2018-02-28
    Changes: Database references
  • Version 1.3: 2020-02-19
    Changes: Derived calculations, Source and taxonomy