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Human class I histocompatibility antigens (HLA-A,B,C). A small proportion only is phosphorylated.

The Biochemical Journal, 01 Jan 1983, 210(1):79-87
https://doi.org/10.1042/bj2100079 PMID: 6303316 PMCID: PMC1154192

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Abstract 

Human Class I HLA antigens (HLA-A,B,C) were isolated by immune precipitation from cells labelled with 32P, [35S]methionine or 125I (by lactoperoxidase-catalysed cell-surface iodination) and were analysed using both one- and two-dimensional electrophoretic systems. In several B-lymphoblastoid cell lines and in human peripheral blood lymphocytes the electrophoretic mobility of the 32P-labelled HLA-A,B,C heavy chains consistently differed from that of molecules labelled by other means. Thus the 32P-labelled heavy chains appeared to be larger and to possess a more acidic pI than did heavy chains labelled with [35S]methionine or 125I, or identified by Coomassie Blue staining. Phosphatase treatment of immunoprecipitates, under conditions where 32P-labelled antigens were shown to be dephosphorylated, did not affect the mobilities of the [35S]methionine-labelled heavy chains. On glycosidase treatment, the positions of the 32P-labelled heavy chains were affected by neuraminidase but not by endo-beta-N-acetylglucosaminidase H. These results imply that phosphorylated HLA-A,B,C antigens comprise only a small proportion (relative to the total cellular HLA-A,B,C antigens) of the biosynthetically mature molecules. The possible significance of such heterogeneity is discussed.

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Biochem J. 1983 Jan 15; 210(1): 79–87.
PMCID: PMC1154192
PMID: 6303316

Human class I histocompatibility antigens (HLA-A,B,C). A small proportion only is phosphorylated.

S R Loube, M J Owen, and M J Crumpton
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Abstract

Human Class I HLA antigens (HLA-A,B,C) were isolated by immune precipitation from cells labelled with 32P, [35S]methionine or 125I (by lactoperoxidase-catalysed cell-surface iodination) and were analysed using both one- and two-dimensional electrophoretic systems. In several B-lymphoblastoid cell lines and in human peripheral blood lymphocytes the electrophoretic mobility of the 32P-labelled HLA-A,B,C heavy chains consistently differed from that of molecules labelled by other means. Thus the 32P-labelled heavy chains appeared to be larger and to possess a more acidic pI than did heavy chains labelled with [35S]methionine or 125I, or identified by Coomassie Blue staining. Phosphatase treatment of immunoprecipitates, under conditions where 32P-labelled antigens were shown to be dephosphorylated, did not affect the mobilities of the [35S]methionine-labelled heavy chains. On glycosidase treatment, the positions of the 32P-labelled heavy chains were affected by neuraminidase but not by endo-beta-N-acetylglucosaminidase H. These results imply that phosphorylated HLA-A,B,C antigens comprise only a small proportion (relative to the total cellular HLA-A,B,C antigens) of the biosynthetically mature molecules. The possible significance of such heterogeneity is discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
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