Tyk2 is a member of the Jak family of protein tyrosine kinases. It associates with and is activated by receptors for many cytokines including IL-13, the IL-6 family, IL-10, and IFN-α and β. Following ligand binding, Tyk2 is activated by phosphorylation of Tyr1054 and/or Tyr1055. Tyk2 is required for the tyrosine phosphorylation of Stat3 in the IFN-β signaling cascade.
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