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• W2090410316 abstract "Beta-2 microglobulin (beta2m) is a member of the immunoglobulin-like domain superfamily that is an essential structural subunit of the MHC class I (MHC-I) molecule. beta2m was previously identified as a susceptibility factor for the development of type 1 diabetes (T1D) in NOD mice, whereby transgenic expression of the beta2ma variant, but not the beta2mb variant, restored diabetes susceptibility to normally resistant NOD.beta2mnull mice. Here we report the crystal structures and thermodynamic stabilities of the NOD MHC-I molecule H2-Db containing these two variants. Our results reveal subtle differences in the structures of the beta2m variants, namely in minor loop shifts and in variations in the hydrogen bonding networks at the interfaces between the components of the ternary complex. We also demonstrate that the thermodynamic stabilities of the beta2m variants in isolation differ. However, the conformation of the peptide in the MHC cleft is unchanged in beta2m allelic Db complexes, as are the TCR recognition surfaces. Thus, despite modest structural differences between allelic complexes, the evidence indicates that Db peptide presentation of the representative peptide is unchanged in the context of either beta2m allelic variant. These data suggest that other mechanisms, such as differential association of MHC-I in multiprotein complexes, are likely responsible for the effect of beta2m on T1D development." @default.
• W2090410316 created "2016-06-24" @default.
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• W2090410316 date "2006-03-01" @default.
• W2090410316 modified "2023-10-16" @default.
• W2090410316 title "Structural analysis of H2-Db class I molecules containing two different allelic forms of the type 1 diabetes susceptibility factor beta-2 microglobulin: Implications for the mechanism underlying variations in antigen presentation" @default.
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• W2090410316 doi "https://doi.org/10.1016/j.molimm.2005.08.005" @default.
• W2090410316 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16229893" @default.
• W2090410316 hasPublicationYear "2006" @default.
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