Biochemical characterization of a T-lymphoma-specific 90,000 molecular weight disulfide linked dimeric glycoprotein.
The biochemical features of a membrane antigen detected by a mouse monoclonal antibody (A1) raised against the murine thymoma cell line EL4 are described. This reagent detected a novel disulfide-linked 90,000 mol. wt dimeric membrane glycoprotein composed of two chains of approx 45,000 mol. wt. Endo-beta-N-acetylglucosaminidase F digestion generated a single 28,000 polypeptide, thus suggesting that the A1 molecule is a homodimer. No structural homology between the A1 molecule and the human T 90/44 protein (9.3 antigen) could be revealed by peptide mapping analysis. In view of the fact that three polypeptides of mol. wts 28,000-30,000, 21,000 and 15,000 respectively co-precipitated with the A1 antigen, the possible relationship of the A1 molecular complex to other known T-cell surface antigens including the antigen receptor is discussed.
Spiazzi
A
A
Institut de Biochimie, Université de Lausanne, Epalinges, Switzerland.
Corradin
G
G
Nagasawa
R
R
Tridente
G
G
MacDonald
H R
HR
Bron
C
C
D000818:Animals; D000951:Antigens, Neoplasm / Q000032:analysis*; D000954:Antigens, Surface / Q000032:analysis*; D002460:Cell Line; D055598:Chemical Phenomena; D002621:Chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D008562:Membrane Glycoproteins / Q000032:analysis* / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D010449:Peptide Mapping; D013945:Thymoma / Q000276:immunology*; D013953:Thymus Neoplasms / Q000276:immunology*
D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D008562:Membrane Glycoproteins; C053828:T-lymphoma membrane glycoprotein 90, mouse