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Title 

Analysis of the stability of HLA-A2 molecules expressed on the cell surface

Authors 

Jong Seok LimKi Young LeeHee Gu LeeIk Hwan KimChong Kil LeeSeong Sun HanKil Hyoun Kim

Publisher 

Springer Verlag (Germany)

Issue Date 

1996

Citation 

Journal of Biochemistry and Molecular Biology, vol. 29, no. 4, pp. 286-293

Keywords 

cell surface expressiondissociation rate constantHLA-A2 moleculeinterferon-γ

Abstract 

Association of antigenic peptide with class I MHC is believed to be crucial for maintaining stable conformation of class I molecules. T2 cells that are defective in TAP gene function mainly express class I molecules with an unstable conformation due to little or no association with antigenic peptides, whereas T1 cells that are normal in TAP gene function mainly express the stable form of class I molecules. In this work, attempts were made to determine the molecular stability of stable and unstable class I molecules. Dissociation of HLA-A2 molecules on T1 and T2 cells was monitored by flow cytomerry using anti-HLA-A2 antibody after the cells were treated with brefeldin A to shut down the transport of newly-assembled HLA-A2. Estimated dissociation rate constants for the stable and unstable forms of HLA-A2 were 0.076 h-1 and 0.66 h-1, respectively. It appeared that both T1 and T2 cells express stable and unstable class I complex, but with different ratios of the two forms. Furthermore, interferon-γ treatment of T1 cells appeared to induce the expression of both the stable and unstable class I molecules. These results demonstrate that class I MHC molecules can be divided into two groups in terms of structural stability and that they exist on the cell surface in both forms in a certain ratio.

ISSN 

1225-8687

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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