title: [Primary structure of human class II histocompatibility antigens (HLA-D). II. Separation of alpha from beta-chains of HLA-D from a homozygous lymphoblastoid B cell line, H2LCL (HLA-A3,3;B7,7;Dw2,2;MT1,1;DC1,1;MB1,1), and characterization of the isolated chain].
abstract: In a previous communication we described the preparation of the alpha/beta-chain complex of HLA-D membrane antigens from a homozygous lymphoblastoid B cell line, H2LCL (HLA-A3,3; B7,7; Dw2,2; DR2,2; MT1,1; DC1,1; MB1,1). In this paper we present the separation of the alpha- and beta-chains in quantitative scale using hydroxylapatite chromatography with a pH 7.15 phosphate buffer, containing sodium dodecyl sulfate. An alternative isolation procedure is electrophoresis, taking advantage of the different isoelectric points of the alpha- and beta-chains. The relative molecular masses, the isoelectric points and the N-terminal sequences are discussed and compared with the results of other investigators. Remarkable is the polymorphism of both the chains, especially the beta-chains. The importance of the previously described three step purification procedure for the preparation of these antigens for sequence studies has been pointed out.
mesh_terms: D001402:B-Lymphocytes / Q000276:immunology*; D002460:Cell Line; D000949:Histocompatibility Antigens Class II / Q000235:genetics / Q000302:isolation & purification*; D006720:Homozygote; D006801:Humans; D007525:Isoelectric Focusing
chemical_list: D000949:Histocompatibility Antigens Class II
vernacular_title: Primärstruktur der menschlichen Histokompatibilitätsantigene der Klasse II (HLA-D). II. Trennung der alpha- von den beta-Ketten des HLA-D einer homozygoten, lymphoblastoiden B-Zell-Linie, H2LCL (HLA-A3,3;B7,7;Dw2,2;DR2,2; MT1,1;DC1,1;MB1,1), und Charakterisierung der isolierten Ketten.