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Interleukin 2 activates a receptor-associated protein kinase.

S H Benedict, G B Mills and E W Gelfand
J Immunol September 1, 1987, 139 (5) 1694-1697;
S H Benedict
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G B Mills
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E W Gelfand
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Abstract

The interleukin 2 (IL 2) receptor complex has been shown to consist of at least two IL 2 binding molecules, one of 55 to 57 kd (gp57Tac) and one of 75 to 78 kd apparent m.w. The data presented here indicate that a protein of m.w. 78,000 (pp78) co-immunoprecipitates with gp57Tac when a monoclonal antibody against gp57Tac is used. The 78 kd molecule is phosphorylated in vitro within the immune complex only in the presence of exogenously added IL 2, whereas the 57 kd molecule is phosphorylated equally in the presence or absence of IL 2. Phosphorylation in vitro of pp78 was demonstrated in extracts of human peripheral blood T cells (PBL-T) and the human T cell line Jurkat, but not in extracts of the human macrophage line U937 or the murine T cell line 2.8.2. Metabolic phosphorylation in intact cells reflects results observed in vitro; both pp78 and gp57Tac are phosphorylated in PBL-T and Jurkat, but not in U937. These data demonstrate that the IL 2 receptor complex contains an IL 2 responsive protein kinase activity and may signal the cell through a phosphorylation event.

  • Copyright © 1987 by American Association of Immunologists

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The Journal of Immunology
Vol. 139, Issue 5
1 Sep 1987
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Interleukin 2 activates a receptor-associated protein kinase.
S H Benedict, G B Mills, E W Gelfand
The Journal of Immunology September 1, 1987, 139 (5) 1694-1697;

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Interleukin 2 activates a receptor-associated protein kinase.
S H Benedict, G B Mills, E W Gelfand
The Journal of Immunology September 1, 1987, 139 (5) 1694-1697;
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Print ISSN 0022-1767        Online ISSN 1550-6606