ISDA

Deposition Date 2001-12-04

Release Date 2002-03-27

Last Version Date 2024-11-20

Entry Detail

PDB ID:

1KJ2

Keywords:

IMMUNE SYSTEM

Title:

Murine Alloreactive ScFv TCR-Peptide-MHC Class I Molecule Complex

Biological Source:

Source Organism:

Mus musculus (Taxon ID: 10090)
(Taxon ID: )

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.71 Å

R-Value Free:

0.27

R-Value Work:

0.22

R-Value Observed:

0.21

Space Group:

P 1 21 1

Download Validation Report

Macromolecular Entities

Polymer Type:polypeptide(L)
Molecule:KB5-C20 T-Cell receptor alpha-chain
Chain IDs:D (auth: A), I (auth: D)
Chain Length:111
Number of Molecules:2
Biological Source:Mus musculus

Protein Blast

Polymer Type:polypeptide(L)
Molecule:KB5-C20 T-Cell receptor beta-chain
Chain IDs:E (auth: B), J (auth: E)
Chain Length:117
Number of Molecules:2
Biological Source:Mus musculus

UniProt ID:P04214 Pfam ID:PF07686

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Allogeneic H-2Kb MHC Class I Molecule
Chain IDs:A (auth: H), F (auth: I)
Chain Length:277
Number of Molecules:2
Biological Source:Mus musculus

UniProt ID:P01901 Pfam ID:PF00129, PF07654

Protein Blast

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

UniProt ID:P01887 Pfam ID:PF07654

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Naturally processed octapeptide PKB1
Gene (Uniprot):Gtpbp1
Chain IDs:B (auth: P), G (auth: Q)
Chain Length:8
Number of Molecules:2
Biological Source:

UniProt ID:O08582

Modified Residue

Compound ID	Chain ID	Parent Comp ID	Details	2D Image
ASN	D	ASN	GLYCOSYLATION SITE

Ligand Molecules

NAG

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, Housset, D, Mazza, G, Gregoire, C, Piras, C, Malissen, B, Fontecilla-Camps, J.C, Reiser, J.-B, Darnault, C, Guimezanes, A, Gregoire, C, Mosser, T, Schmitt-Verhulst, A.-M, Fontecilla-Camps, J.C, Malissen, B, Housset, D, Mazza, G, 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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Primary Citation of related structures