ISDA

Entry Detail

PDB ID:

1TMC

Keywords:

Title:

THE THREE-DIMENSIONAL STRUCTURE OF A CLASS I MAJOR HISTOCOMPATIBILITY COMPLEX MOLECULE MISSING THE ALPHA3 DOMAIN OF THE HEAVY CHAIN

Biological Source:

Source Organism:

Homo sapiens

Host Organism:

Escherichia coli

PDB Version:

Deposition Date:

1994-12-19

Release Date:

1995-03-31

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.30 Å

R-Value Work:

0.20

R-Value Observed:

0.20

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:CLASS I HISTOCOMPATIBILITY ANTIGEN (HLA-AW68)
Chain IDs:A
Chain Length:175
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:P04439 Pfam ID:PF00129

Protein Blast

Polymer Type:polypeptide(L)
Description:BETA 2-MICROGLOBULIN
Chain IDs:B
Chain Length:100
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:P61769 Pfam ID:PF07654

Primary Citation

The three-dimensional structure of a class I major histocompatibility complex molecule missing the alpha 3 domain of the heavy chain.

Collins, E.J, Garboczi, D.N, Karpusas, M.N, Wiley, D.C, Garboczi, D.N, Madden, D.R, Wiley, D.C, Madden, D.R, Garboczi, D.N, Wiley, D.C, Guo, H.-C, Madden, D.R, Silver, M.L, Jardetzky, T.S, Gorga, J.C, Strominger, J.L, Wiley, D.C, Guo, H.-C, Jardetzky, T.S, Garrett, T.P.J, Lane, W.S, Strominger, J.L, Wiley, D.C, Garboczi, D.N, Hung, D.T, Wiley, D.C, Saper, M.A, Bjorkman, P.J, Wiley, D.C, Bjorkman, P.J, Saper, M.A, Samraoui, B, Bennett, W.S, Strominger, J.L, Wiley, D.C, Bjorkman, P.J, Saper, M.A, Samraoui, B, Bennett, W.S, Strominger, J.L, Wiley, D.C, Bjorkman, P.J, Strominger, J.L, Wiley, D.C.Show

Proc.Natl.Acad.Sci.USA 92 1218 1221 (1995)

PMID: 7862664 DOI: 10.1073/pnas.92.4.1218

Abstact

Class I major histocompatibility complex (MHC) molecules are ternary complexes of the soluble serum protein beta 2-microglobulin, MHC heavy chain, and bound peptide. The first two domains (alpha 1, alpha 2) of the heavy chain create the peptide binding cleft and the surface that contacts the T-cell receptor. The third domain (alpha 3) associates with the T-cell co-receptor, CD8, during T-cell recognition. Here we describe the x-ray crystal structure of a human class I MHC molecule, HLA-Aw68, from which the alpha 3 domain has been proteolytically removed. The resulting molecule shows no gross morphological changes compared to the intact protein. A decameric peptide complexed with the intact HLA-Aw68 is seen to bind to the proteolized molecule in the conventional manner, demonstrating that the alpha 3 domain is not required for the structural integrity of the molecule or for peptide binding.

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