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The Journal of Immunology, Vol 138, Issue 4 1178-1183, Copyright © 1987 by American Association of Immunologists

ARTICLES

Association with beta 2-microglobulin controls the expression of transfected human class I genes

RS Rein, GH Seemann, JJ Neefjes, FM Hochstenbach, NJ Stam and HL Ploegh

The genes encoding HLA-B27K and HLA-B27W were transfected into murine recipient cells. A monoclonal antibody HC-10, directed against free B- locus heavy chain, was the only reagent capable of efficiently detecting the HLA-B27 heavy chains in detergent lysates. These heavy chains were devoid of sialic acid. Trace amounts of HLA-B27 could be isolated with the anti-HLA-A,-B antibody W6/32, which reacts with the heavy chain beta 2-microglobulin complex. In marked contrast, HLA-A2 and -B7 genes, when transfected, yielded easily detectable amounts of antigen precipitable with W6/32, which carried the usual complement of sialic acids. Because the alpha 3 domains of HLA-B27 and HLA-B7 and the more COOH-terminal portions are identical in amino acid sequence, structural elements in the polymorphic alpha 1 and alpha 2 domains must control association of heavy chain with beta 2-microglobulin. Introduction of a human beta 2-microglobulin gene into L cells transfected with the HLA-B27 gene rescued the expression of HLA-B27 at the cell surface, as evidenced by reactivity with W6/32, surface staining, and the presence of sialic acid on the heavy chain.


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