A structural model for the location of the Rodgers and the Chido antigenic determinants and their correlation with the human complement component C4A/C4B isotypes |
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Authors: | C. Yung Yu R. Duncan Campbell Rodney R. Porter |
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Affiliation: | (1) Research Center for Cancer and Transplantation, Department of Pathology, University of Melbourne, 3052 Parkville, Victoria, Australia |
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Abstract: | In this study, the relative mass of the Ly-6A.2 antigen was shown to be 12 000–14 000, in contrast to initial studies which showed the relative mass to be 33 000. Using polymorphic Ly-6-specific antibodies, the 33 000 molecules could be immunoprecipitated from surface-iodinated thymocytes of Ly-6A.2+, Ly-6A.2– strains and a Ly-6A.2– mutant cell line BW(Thy-1–e). This clearly demonstrated that 33 000 molecules were not associated with the Ly-6 polymorphism. By contrast, when biosynthetically labeled Ly-6A.2+ spleen cell lysates were analyzed, the major species immunoprecipitated by the polymorphic Ly-6A.2-specific antibody was 12000–14000, although a minor 33 000 species were also evident. The Ly-6A-specific antibody D7 which detects a monomorphic epitope on the Ly-6A molecule could immunoprecipilate the 12000–14000 molecules from surface-labeled cells. By contrast, the Ly-6A.2-specific antibodies detecting the polymorphic Ly-6A.2 determinant could not, though the reasons for this difference are not clear. Thus 12 000–14 000 molecules were only immunoprecipitated from Ly-6A.2+ cells, whereas 33 000 molecules were precipitated from both Ly-6A.2+ cells and Ly-6A.2– cells. These findings suggest that the 33 000 molecules immunoprecipitated by 5041-24.2 are most likely to be an unrelated protein, possibly cross-reactive with some Ly-6A.2 antibodies. |
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