5IRO

Crystal structure of a complex between the Human adenovirus type 4 E3-19K protein and MHC class molecule HLA-A2/TAX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.64 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.257 
  • R-Value Observed: 0.259 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of the Adenovirus Type 4 (Species E) E3-19K/HLA-A2 Complex Reveals Species-Specific Features in MHC Class I Recognition.

Li, L.Santarsiero, B.D.Bouvier, M.

(2016) J Immunol 197: 1399-1407

  • DOI: https://doi.org/10.4049/jimmunol.1600541
  • Primary Citation of Related Structures:  
    5IRO

  • PubMed Abstract: 

    Adenoviruses (Ads) subvert MHC class I Ag presentation and impair host anti-Ad cellular activities. Specifically, the Ad-encoded E3-19K immunomodulatory protein targets MHC class I molecules for retention within the endoplasmic reticulum of infected cells. We report the x-ray crystal structure of the Ad type 4 (Ad4) E3-19K of species E bound to HLA-A2 at 2.64-Å resolution. Structural analysis shows that Ad4 E3-19K adopts a tertiary fold that is shared only with Ad2 E3-19K of species C. A comparative analysis of the Ad4 E3-19K/HLA-A2 structure with our x-ray structure of Ad2 E3-19K/HLA-A2 identifies species-specific features in HLA-A2 recognition. Our analysis also reveals common binding characteristics that explain the promiscuous, and yet high-affinity, association of E3-19K proteins with HLA-A and HLA-B molecules. We also provide structural insights into why E3-19K proteins do not associate with HLA-C molecules. Overall, our study provides new information about how E3-19K proteins selectively engage with MHC class I to abrogate Ag presentation and counteract activation of CD8(+) T cells. The significance of MHC class I Ag presentation for controlling viral infections, as well as the threats of viral infections in immunocompromised patients, underline our efforts to characterize viral immunoevasins, such as E3-19K.


  • Organizational Affiliation

    Department of Microbiology and Immunology, College of Medicine, University of Illinois, Chicago, IL 60612;


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HLA class I histocompatibility antigen, A-2 alpha chain
A, E, I, M, Q
A, E, I, M, Q, U
275Homo sapiensMutation(s): 0 
Gene Names: HLA-AHLAA
UniProt & NIH Common Fund Data Resources
Find proteins for P04439 (Homo sapiens)
Explore P04439 
Go to UniProtKB:  P04439
PHAROS:  P04439
GTEx:  ENSG00000206503 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04439
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
TAX protein
B, F, J, N, R
B, F, J, N, R, V
9Human T-cell leukemia virus type IMutation(s): 0 
UniProt
Find proteins for P14079 (Human T-cell leukemia virus 1 (isolate Caribbea HS-35 subtype A))
Explore P14079 
Go to UniProtKB:  P14079
Entity Groups  
UniProt GroupP14079
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulin
C, G, K, O, S
C, G, K, O, S, W
100Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
GTEx:  ENSG00000166710 
Entity Groups  
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UniProt GroupP61769
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
E3 19 kDa protein
D, H, L, P, T
D, H, L, P, T, X
108Human adenovirus E4Mutation(s): 0 
Gene Names: E3
UniProt
Find proteins for Q8BEL5 (Human adenovirus E serotype 4)
Explore Q8BEL5 
Go to UniProtKB:  Q8BEL5
Entity Groups  
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UniProt GroupQ8BEL5
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.64 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.257 
  • R-Value Observed: 0.259 
  • Space Group: P 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 165.727α = 90
b = 165.727β = 90
c = 122.858γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01 AI108546

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-24
    Type: Initial release
  • Version 1.1: 2017-09-06
    Changes: Author supporting evidence, Derived calculations
  • Version 1.2: 2017-11-01
    Changes: Author supporting evidence
  • Version 1.3: 2019-12-11
    Changes: Author supporting evidence