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Multiple tyrosine residues in the intracellular domain of the common beta subunit of the interleukin 5 receptor are involved in activation of STAT5. | LitMetric

In contrast to the general model of cytokine-induced JAK/STAT signaling, tyrosine phosphorylation of the IL-5R beta chain seems to be dispensable for STAT activation in cells overexpressing exogenous STAT proteins. In this study we expressed IL-5 receptor mutants in 293 cells and studied IL-5-induced endogenous STAT-dependent transcription. Our results indicate that: (a) tyrosine phosphorylation of the IL-5R beta chain is required for endogenous STAT5 activation, (b) multiple tyrosine residues are phosphorylated upon IL-5 stimulation, including Tyr577, Tyr612, Tyr695, and Tyr750, and (c) Tyr612, Tyr695, and Tyr750 are all capable of inducing activation of STAT5, demonstrating a high level of functional redundancy within the IL-5R beta chain.

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http://dx.doi.org/10.1016/s0014-5793(97)00768-0DOI Listing

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