ISDA

Deposition Date 2005-11-29

Release Date 2006-03-08

Last Version Date 2024-11-20

Entry Detail

PDB ID:

2C7U

Keywords:

GLYCOPROTEIN/PEPTIDE

Title:

Conflicting selective forces affect CD8 T-cell receptor contact sites in an HLA-A2 immunodominant HIV epitope.

Biological Source:

Source Organism:

HOMO SAPIENS (Taxon ID: 9606)
HUMAN IMMUNODEFICIENCY VIRUS 1 (Taxon ID: 11676)

Host Organism:

ESCHERICHIA COLI

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.38 Å

R-Value Free:

0.31

R-Value Work:

0.24

R-Value Observed:

0.25

Space Group:

P 1 21 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:HLA CLASS I HISTOCOMPATIBILITY ANTIGEN, A-2 ALPHA CHAIN
Chain IDs:A, D
Chain Length:276
Number of Molecules:2
Biological Source:HOMO SAPIENS

UniProt ID:P04439 Pfam ID:PF00129, PF07654

Protein Blast

Polymer Type:polypeptide(L)
Molecule:BETA-2-MICROGLOBULIN
Gene (Uniprot):B2M
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)
Molecule:GAG PROTEIN
Gene (Uniprot):gag
Chain IDs:C, F
Chain Length:9
Number of Molecules:2
Biological Source:HUMAN IMMUNODEFICIENCY VIRUS 1

UniProt ID:O11822 Pfam ID:PF00540

Primary Citation

Conflicting Selective Forces Affect T Cell Receptor Contacts in an Immunodominant Human Immunodeficiency Virus Epitope.

Iversen, A.K, Stewart-Jones, G, Learn, G.H, Christie, N, Sylvester-Hviid, C, Armitage, A.E, Kaul, R, Beattie, T, Lee, J.K, Li, Y, Chotiyarnwong, P, Dong, T, Xu, X, Luscher, M.A, Macdonald, K, Ullum, H, Klarlund-Pedersen, B, Skinhoj, P, Fugger, L, Buus, S, Mullins, J.I, Jones, E.Y, Van Der Merwe, P.A, Mcmichael, A.J.Show

Nat.Immunol. 7 179 ? (2006)

PMID: 16388312 DOI: 10.1038/NI1298

Abstact

Cytotoxic T lymphocytes (CTLs) are critical for the control of human immunodeficiency virus, but containment of virus replication can be undermined by mutations in CTL epitopes that lead to virus escape. We analyzed the evolution in vivo of an immunodominant, HLA-A2-restricted CTL epitope and found two principal, diametrically opposed evolutionary pathways that exclusively affect T cell-receptor contact residues. One pathway was characterized by acquisition of CTL escape mutations and the other by selection for wild-type amino acids. The pattern of CTL responses to epitope variants shaped which variant(s) prevailed in the virus population. The pathways notably influenced the amount of plasma virus, as patients with efficient CTL selection had lower plasma viral loads than did patients without efficient selection. Thus, viral escape from CTL responses does not necessarily correlate with disease progression.

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