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. 1991 Jan;2(1):73–85. doi: 10.1091/mbc.2.1.73

Ligand-stimulated tyrosine phosphorylation of the IL-2 receptor beta chain and receptor-associated proteins.

D A Shackelford 1, I S Trowbridge 1
PMCID: PMC361713  PMID: 2007186

Abstract

Interleukin-2 (IL-2) stimulates the rapid phosphorylation on tyrosine of several specific cellular proteins. However, the high-affinity human IL-2 receptor, composed of an alpha (p55) and beta (p70/75) subunit, does not contain a cytoplasmic tyrosine kinase domain. In this study, we investigated the identities of the proteins phosphorylated on tyrosine in response to IL-2 stimulation to examine possible pathways of signal transduction. By the use of immunoblotting with anti-phosphotyrosine antibodies, we demonstrate that IL-2 augments tyrosine phosphorylation of the IL-2 receptor beta chain in human cell lines expressing either high-affinity (alpha/beta) receptors or only the beta chain. In IL-2-dependent mouse T cell lines, a 100,000-Da protein was phosphorylated on tyrosine in response to IL-2 and is proposed to be the mouse IL-2 receptor beta chain. Two other cellular proteins, pp55 and pp105 in human or pp55 and pp115 in mouse cell lines, were phosphorylated on tyrosine in response to IL-2 and coimmunoprecipitated with the high-affinity IL-2 receptor after chemical crosslinking of IL-2-stimulated cells. Thus, the IL-2 receptor may associate with additional subunits or with cellular proteins involved in signal transduction.

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