title: The Ly-3 antigens on mouse thymocytes: immune precipitation and molecular weight characterization.
abstract: Specific anti-Ly sera were employed to precipitate Ly antigens from Nonidet P-40 extracts of mouse thymocytes labeled with 125I using lactoperoxidase and with NaB3H4 using galactose oxidase. Thymocytes from mice of the congenic strains C57BL/6J (Ly-2.2, Ly-3.2 positive), C57BL/6Ly-2a, Ly-3a (Ly-2.1, Ly-3.1 positive) and C57BL/6-Ly-2a (Ly-2.1, Ly-3.2-positive) were used as sources of labeled antigens and as immune adsorbants to permit evaluation of the specificity of each anti-Ly serum employed. Results of sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) under reducing conditions are consistent with the Ly-3.1 antigen containing a glycoprotein subunit with an apparent mol wt of 35,000 daltons. Specific precipitates obtained using anti-Ly-2.1 serum yielded SDS-PAGE profiles identical to that obtained with anti-Ly-3.1 serum, suggesting that the Ly-2 and Ly-3 antigens have the same molecular weight distribution. The relationships of these results to the observed close genetic and topological linkage of Ly-2 and Ly-3 and to the genetic linkage of these loci with the IB-peptide marker, a mouse Bk-region polymorphism, are discussed.
mesh_terms: D000818:Animals; D000936:Antigen-Antibody Complex; D002850:Chromatography, Gel; D004591:Electrophoresis, Polyacrylamide Gel; D005690:Galactose / Q000032:analysis; D008040:Genetic Linkage; D006023:Glycoproteins / Q000032:analysis; D007145:Immunoglobulin kappa-Chains / Q000096:biosynthesis; D007519:Isoantigens / Q000032:analysis*; D051379:Mice; D008810:Mice, Inbred C57BL; D008970:Molecular Weight; D011402:Pronase; D013499:Surface Properties; D013601:T-Lymphocytes / Q000276:immunology*; D013950:Thymus Gland / Q000276:immunology; D014357:Trypsin
chemical_list: D000936:Antigen-Antibody Complex; D006023:Glycoproteins; D007145:Immunoglobulin kappa-Chains; D007519:Isoantigens; D014357:Trypsin; D011402:Pronase; D005690:Galactose