2OJE image
Deposition Date 2007-01-12
Release Date 2007-01-23
Last Version Date 2024-10-16
Entry Detail
PDB ID:
2OJE
Keywords:
Title:
Mycoplasma arthritidis-derived mitogen complexed with class II MHC molecule HLA-DR1/HA complex in the presence of EDTA
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Mycoplasma arthritidis (Taxon ID: 2111)
(Taxon ID: )
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.00 Å
R-Value Free:
0.26
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
I 2 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:HLA class II histocompatibility antigen, DR alpha chain precursor
Gene (Uniprot):HLA-DRA
Chain IDs:A, E
Chain Length:180
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:HLA class II histocompatibility antigen, DRB1-1 beta chain precursor
Chain IDs:B, F
Chain Length:190
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:haemagglutinin peptide 306-318
Chain IDs:C, G
Chain Length:13
Number of Molecules:2
Biological Source:
Polymer Type:polypeptide(L)
Molecule:Superantigen
Chain IDs:D, H
Chain Length:214
Number of Molecules:2
Biological Source:Mycoplasma arthritidis
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Ligand Molecules
Primary Citation
Zinc induces dimerization of the class II major histocompatibility complex molecule that leads to cooperative binding to a superantigen.
J.Biol.Chem. 282 5991 6000 (2007)
PMID: 17166841 DOI: 10.1074/jbc.M608482200

Abstact

Dimerization of class II major histocompatibility complex (MHC) plays an important role in the MHC biological function. Mycoplasma arthritidis-derived mitogen (MAM) is a superantigen that can activate large fractions of T cells bearing specific T cell receptor Vbeta elements. Here we have used structural, sedimentation, and surface plasmon resonance detection approaches to investigate the molecular interactions between MAM and the class II MHC molecule HLA-DR1 in the context of a hemagglutinin peptide-(306-318) (HA). Our results revealed that zinc ion can efficiently induce the dimerization of the HLA-DR1/HA complex. Because the crystal structure of the MAM/HLA-DR1/hemagglutinin complex in the presence of EDTA is nearly identical to the structure of the complex crystallized in the presence of zinc ion, Zn(2+) is evidently not directly involved in the binding between MAM and HLA-DR1. Sedimentation and surface plasmon resonance studies further revealed that MAM binds the HLA-DR1/HA complex with high affinity in a 1:1 stoichiometry, in the absence of Zn(2+). However, in the presence of Zn(2+), a dimerized MAM/HLA-DR1/HA complex can arise through the Zn(2+)-induced DR1 dimer. In the presence of Zn(2+), cooperative binding of MAM to the DR1 dimer was also observed.

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Primary Citation of related structures