Interferon Receptor alpha (IFN-a R1) is a class II cytokine receptor which belongs to type I human interferons (IFNs) family. IFNs plays a role in antiviral, antiproliferative, immunomodulatory, antitumor, and antiparasitic activities by inducing transcription of IFN-stimuated genes (ISGs) through activation of the Jak-STAT pathway. Specifically, Interferon Receptor alpha is a 135-kda signal transducing subunit of the IFN alpha/beta receptor complex (IFN-a R). Interferon Receptor alpha is phospholyated through PTK- and PKC-mediated phosphorylation, which initiates docking of STAT proteins to IFNs. This leads to activation of STAT proteins by PTK-mediated phosphorylation. The mechanism behind the amplification of Interferon Receptor alpha complex mediated transmembrane signaling has been linked to tyrosine phosphorylation on Interferon Receptor alpha. IFNAR1 possesses a large N-glycosylated ectodomain.