ISDA

Entry Detail

PDB ID:

4E5X

Keywords:

IMMUNE SYSTEM/TRANSCRIPTION

Title:

Crystal structure of a complex between the human adenovirus type 2 E3-19K protein and MHC class I molecule HLA-A2/Tax

Biological Source:

Source Organism:

Homo sapiens, Human adenovirus 6, Human T-cell lymphotropic virus type 1 (african isolate)

Host Organism:

Escherichia coli

PDB Version:

Deposition Date:

2012-03-14

Release Date:

2012-10-10

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.95 Å

R-Value Free:

0.24

R-Value Work:

0.21

R-Value Observed:

0.21

Space Group:

I 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:HLA class I histocompatibility antigen, A-2 alpha chain
Chain IDs:A, D
Chain Length:275
Number of Molecules:2
Biological Source:Homo sapiens

UniProt ID:P04439 Pfam ID:PF00129, PF07654

Protein Blast

Polymer Type:polypeptide(L)
Description:Beta-2-microglobulin
Chain IDs:B, E
Chain Length:100
Number of Molecules:2
Biological Source:Homo sapiens

UniProt ID:P61769 Pfam ID:PF07654

Protein Blast

Polymer Type:polypeptide(L)
Description:Protein Tax-1
Chain IDs:C, F
Chain Length:9
Number of Molecules:2
Biological Source:Human T-cell lymphotropic virus type 1 (african isolate)

UniProt ID:P0C213

Protein Blast

Polymer Type:polypeptide(L)
Description:Early E3 18.5 kDa glycoprotein
Chain IDs:G, H
Chain Length:100
Number of Molecules:2
Biological Source:Human adenovirus 6

UniProt ID:P68979 Pfam ID:PF04881

Primary Citation

Crystal structure of adenovirus E3-19K bound to HLA-A2 reveals mechanism for immunomodulation.

Li, L, Muzahim, Y, Bouvier, M.Show

Nat.Struct.Mol.Biol. 19 1176 1181 (2012)

PMID: 23042604 DOI: 10.1038/nsmb.2396

Abstact

E3-19K binds to and retains MHC class I molecules in the endoplasmic reticulum, suppressing anti-adenovirus activities of T cells. We determined the structure of the adenovirus serotype 2 (Ad2, species C) E3-19K-HLA-A2 complex to 1.95-Å resolution. Ad2 E3-19K binds to the N terminus of the HLA-A2 groove, contacting the α1, α2 and α3 domains and β(2)m. Ad2 E3-19K has a unique structure comprising a large N-terminal domain, formed by two partially overlapping β-sheets arranged in a V shape, and a C-terminal α-helix and tail. The structure reveals determinants in E3-19K and HLA-A2 that are important for complex formation; conservation of some of these determinants in E3-19K proteins of different species and MHC I molecules of different loci suggests a universal binding mode for all E3-19K proteins. Our structure is important for understanding the immunomodulatory function of E3-19K.

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