1A1M image
Entry Detail
PDB ID:
1A1M
Title:
MHC CLASS I MOLECULE B*5301 COMPLEXED WITH PEPTIDE TPYDINQML FROM GAG PROTEIN OF HIV2
Biological Source:
PDB Version:
Deposition Date:
1997-12-11
Release Date:
1998-04-08
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:HLA class I histocompatibility antigen, BW-53 B*5301 alpha chain
Chain IDs:A
Chain Length:278
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Beta-2-microglobulin
Chain IDs:B
Chain Length:99
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:PEPTIDE TPYDINQML
Chain IDs:C
Chain Length:9
Number of Molecules:1
Biological Source:Human immunodeficiency virus 2
Primary Citation
Bound water structure and polymorphic amino acids act together to allow the binding of different peptides to MHC class I HLA-B53.
Immunity 4 215 228 (1996)
PMID: 8624812 DOI: 10.1016/S1074-7613(00)80430-6

Abstact

The structure of the human MHC class I molecule HLA-B53 complexed to two nonameric peptide epitopes (from the malaria parasite P. falciparum and the HIV2 gag protein) has been determined by X-ray crystallography at 2.3 angstrom resolution. The structures reveal the architecture of a Pro-specific B pocket common to many HLA-B alleles. Relative to other alleles, the B53 peptide-binding groove is widened by a significant (up to 1.25 angstrom) shift in the position of the alpha 1 helix. Within this groove, bound water molecules, acting in concert with the side chains of polymorphic residues, provide the functional malleability of the MHC, which enables the high affinity/low specificity binding of multiple peptide epitopes.

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Primary Citation of related structures