alexa Acquisition of HLA class I W6 32 defined antigenic determinant by heavy chains from different species following association with bovine beta 2-microglobulin.
Neurology

Neurology

Journal of Neurological Disorders

Author(s): KahnPerles B, Boyer C, Arnold B, Sanderson AR, Ferrier P,

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Abstract Murine, rat, rabbit and guinea pig class I heavy chains, which do not react with W6/32 monoclonal antibody when they are expressed in association with autologous beta 2-microglobulin (beta 2-m), can acquire such a reactivity once they are expressed at the surface of cells cultured in conditions which allow their association with bovine beta 2-m. Sequence comparison of beta 2-ms suggests that glutamine at position 89 might be critical for the induction of the W6/32 defined antigenic determinant. However, in the murine species, certain class I heavy chains, in spite of their association with bovine beta 2-m, do not express this determinant. Using genetically engineered hybrid class I molecules and selected congenic strains of mice this negative property was shown to be related to the presence of a cysteine residue at position 121 which allows covalent association of beta 2-m to class I heavy chains (Bushkin, Y., J-S. Tung, A. Pinter, J. Michaelson, and E. A. Boyse. 1986. Unusual association of beta 2-microglobulin with certain class I heavy chains of the murine major histocompatibility complex. Proc. Natl. Acad. Sci. USA 83:432). Therefore, expression of the W6/32 defined antigenic determinant implicates both the beta 2-m and the second domain of the heavy chain, but its expression (or exposure) is prevented by the covalent fixation on cysteine 121 of the light chain.
This article was published in J Immunol and referenced in Journal of Neurological Disorders

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