ISDA

Deposition Date 2007-06-07

Release Date 2007-11-06

Last Version Date 2024-11-20

Entry Detail

PDB ID:

2V2W

Keywords:

IMMUNE SYSTEM

Title:

T CELL CROSS-REACTIVITY AND CONFORMATIONAL CHANGES DURING TCR ENGAGEMENT

Biological Source:

Source Organism:

HOMO SAPIENS (Taxon ID: 9606)
HUMAN IMMUNODEFICIENCY VIRUS (Taxon ID: 12721)

Host Organism:

ESCHERICHIA COLI

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.60 Å

R-Value Free:

0.23

R-Value Work:

0.19

R-Value Observed:

0.20

Space Group:

P 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

Polymer Type:polypeptide(L)
Molecule:HIV P17
Chain IDs:C, F
Chain Length:9
Number of Molecules:2
Biological Source:HUMAN IMMUNODEFICIENCY VIRUS

Primary Citation

T Cell Cross-Reactivity and Conformational Changes During Tcr Engagement.

Lee, J.K, Stewart-Jones, G, Dong, T, Harlos, K, Di Gleria, K, Dorrell, L, Douek, D.C, Van Der Merwe, P.A, Jones, E.Y, Mcmichael, A.J.Show

J.Exp.Med. 200 1455 ? (2004)

PMID: 15583017 DOI: 10.1084/JEM.20041251

Abstact

All thymically selected T cells are inherently cross-reactive, yet many data indicate a fine specificity in antigen recognition, which enables virus escape from immune control by mutation in infections such as the human immunodeficiency virus (HIV). To address this paradox, we analyzed the fine specificity of T cells recognizing a human histocompatibility leukocyte antigen (HLA)-A2-restricted, strongly immunodominant, HIV gag epitope (SLFNTVATL). The majority of 171 variant peptides tested bound HLA-A2, but only one third were recognized. Surprisingly, one recognized variant (SLYNTVATL) showed marked differences in structure when bound to HLA-A2. T cell receptor (TCR) recognition of variants of these two peptides implied that they adopted the same conformation in the TCR-peptide-major histocompatibility complex (MHC) complex. However, the on-rate kinetics of TCR binding were identical, implying that conformational changes at the TCR-peptide-MHC binding interface occur after an initial permissive antigen contact. These findings have implications for the rational design of vaccines targeting viruses with unstable genomes.

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