1BQH image
Deposition Date 1998-08-16
Release Date 1998-08-19
Last Version Date 2024-10-30
Entry Detail
PDB ID:
1BQH
Keywords:
IMMUNE SYSTEM
Title:
MURINE CD8AA ECTODOMAIN FRAGMENT IN COMPLEX WITH H-2KB/VSV8
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Host Organism:
Mus musculus
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.80 Å
R-Value Free:
0.29
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 21 21 21
1BQH validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:PROTEIN (H-2 CLASS I HISTOCOMPATIBILITY ANTIGEN)
Gene (Uniprot):H2-K1
Chain IDs:A, D
Chain Length:274
Number of Molecules:2
Biological Source:Mus musculus
UniProt ID:P01901 Pfam ID:PF00129, PF07654
Protein Blast
Polymer Type:polypeptide(L)
Molecule:PROTEIN (BETA-2-MICROGLOBULIN )
Gene (Uniprot):B2m
Chain IDs:B, E
Chain Length:99
Number of Molecules:2
Biological Source:Mus musculus
UniProt ID:P01887 Pfam ID:PF07654
Protein Blast
Polymer Type:polypeptide(L)
Molecule:PROTEIN (CD8A OR LYT2 OR LYT-2)
Gene (Uniprot):Cd8a
Chain IDs:G, H, I, J (auth: K)
Chain Length:129
Number of Molecules:4
Biological Source:Mus musculus
UniProt ID:P01731 Pfam ID:PF07686
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN H ASN GLYCOSYLATION SITE
Ligand Molecules
NAG
Primary Citation
Structural basis of CD8 coreceptor function revealed by crystallographic analysis of a murine CD8alphaalpha ectodomain fragment in complex with H-2Kb.
Immunity 9 519 530 (1998)
PMID: 9806638 DOI: 10.1016/S1074-7613(00)80635-4

Abstact

The crystal structure of the two immunoglobulin variable-like domains of the murine CD8alphaalpha homodimer complexed to the class I MHC H-2Kb molecule at 2.8 A resolution shows that CD8alphaalpha binds to the protruding MHC alpha3 domain loop in an antibody-like manner. Comparison of mouse CD8alphaalpha/H-2Kb and human CD8alphaalpha/HLA-A2 complexes reveals shared as well as species-specific recognition features. In both species, coreceptor function apparently involves the participation of CD8 dimer in a bidentate attachment to an MHC class I molecule in conjunction with a T cell receptor without discernable conformational alteration of the peptide or MHC antigen-presenting platform.

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Chemical

Disease

Primary Citation of related structures
1BQH