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J Gen Virol 66 (1985), 1439-1448; DOI 10.1099/0022-1317-66-7-1439
© 1985 Society for General Microbiology
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Phosphorylation of Recombinant Interferon-gamma by Kinases Released from Various Cells

B. Robert-Galliot, M. J. Commoy-Chevalier, P. Georges1 and C. Chany

Institut National de la Santé et de la Recherche Médicale, U.43
and1 Laboratoire de Biochimie, Hôpital Saint Vincent-de-Paul, 74 avenue Denfert-Rochereau, 75674 Paris Cedex 14, France

Recombinant interferon-gamma (IFN-{gamma}) in contact with human embryonic fibroblasts or with a great variety of cells from different animal species was phosphorylated in the presence of [{gamma}-32P]ATP and magnesium ions by a protein kinase released in the culture medium. Using SDS-polyacrylamide gel electrophoresis, we found that both the monomeric (17000 to 18000) and dimeric (34000 to 35000) molecular weight forms of IFN-{gamma} became intensely radioactive. Serine, but not threonine or tyrosine, was phosphorylated. It is of interest that the kinase released from reputedly insensitive cells also phosphorylated IFN-{gamma}. The process did not noticeably degrade the antiviral functions of the molecule nor did it affect, at least in a detectable manner, its anti-proliferative effect on WISH or Daudi cells. Furthermore, the antigenic structure and its capacity to react with monoclonal antibodies were also unaltered. It is presently not known which biological function is regulated by the phosphorylating process.

Keywords: IFN-{gamma}, protein kinase, phosphorylation

Received 18 September 1984; accepted 22 March 1985.




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Copyright © 1985 by the Society for General Microbiology.