ISDA: 1KJ3

Deposition Date 2001-12-04

Release Date 2002-03-27

Last Version Date 2024-11-13

Entry Detail

PDB ID:

1KJ3

Keywords:

IMMUNE SYSTEM

Title:

Mhc Class I H-2Kb molecule complexed with pKB1 peptide

Biological Source:

Source Organism:

Mus musculus (Taxon ID: 10090)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.30 Å

R-Value Free:

0.25

R-Value Work:

0.20

R-Value Observed:

0.21

Space Group:

P 1 21 1

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:H-2KB MHC CLASS I MOLECULE ALPHA CHAIN
Gene (Uniprot):H2-K1
Chain IDs:A (auth: H), D (auth: I)
Chain Length:279
Number of Molecules:2
Biological Source:Mus musculus

UniProt ID:P01901 Pfam ID:PF00129, PF07654

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:BETA-2 MICROGLOBULIN
Gene (Uniprot):B2m
Chain IDs:C (auth: L), F (auth: M)
Chain Length:99
Number of Molecules:2
Biological Source:Mus musculus

UniProt ID:P01887 Pfam ID:PF07654

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:NATURALLY PROCESSED OCTAPEPTIDE PKB1
Gene (Uniprot):Gtpbp1
Chain IDs:B (auth: P), E (auth: Q)
Chain Length:8
Number of Molecules:2
Biological Source:

UniProt ID:O08582

Primary Citation

A T cell receptor CDR3beta loop undergoes conformational changes of unprecedented magnitude upon binding to a peptide/MHC class I complex.

Reiser, J.B, Gregoire, C, Darnault, C, Mosser, T, Guimezanes, A, Schmitt-Verhulst, A.M, Fontecilla-Camps, J.C, Mazza, G, Malissen, B, Housset, D, Fremont, D, Stura, E, Matsumura, M, Peterson, P, Wilson, I, Guimezanes, A, Barret-Wilt, G, Gulden-Thompson, P, Shabanowitz, J, Hunt, D, Schmitt-Verhulst, A.-M.Show

Immunity 16 345 354 (2002)

PMID: 11911820 DOI: 10.1016/S1074-7613(02)00288-1

Abstact

The elongated complementary-determining region (CDR) 3beta found in the unliganded KB5-C20 TCR protrudes from the antigen binding site and prevents its docking onto the peptide/MHC (pMHC) surface according to a canonical diagonal orientation. We now present the crystal structure of a complex involving the KB5-C20 TCR and an octapeptide bound to the allogeneic H-2K(b) MHC class I molecule. This structure reveals how a tremendously large CDR3beta conformational change allows the KB5-C20 TCR to adapt to the rather constrained pMHC surface and achieve a diagonal docking mode. This extreme case of induced fit also shows that TCR plasticity is primarily restricted to CDR3 loops and does not propagate away from the antigen binding site.

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