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J. Biol. Chem., Vol. 259, Issue 18, 11162-11164, 09, 1984

28,000-dalton polypeptide (p28) of adult T-cell leukemia-associated antigen encoded by 24 S mRNA of human T-cell leukemia virus has an associated protein kinase activity

N Kobayashi, Y Koyanagi, N Yamamoto, Y Hinuma, H Sato, K Okochi and M Hatanaka

Human T-cell leukemia virus producer cell line MT-2 was labeled with [32P]phosphoric acid, and its cell extracts were immunoprecipitated with mouse monoclonal antibodies (GIN-7, and KK-1) and rabbit sera (anti-p24, and anti-gp68). Analysis of the immunocomplexes on sodium dodecyl sulfate-polyacrylamide gell electrophoresis revealed that p53, p28, and p19 of adult T-cell leukemia-associated antigens were phosphorylated in vivo. Immunocomplexes of MT-2 cell extract with monoclonal antibody KK-1 were incubated with [gamma-32P]ATP in vitro and it was revealed that the phosphokinase activity was associated with p28. The phosphokinase activity of p28 was specific to the serine residue but was not to the tyrosine residue.
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