IFNAR1 Antibody - #AF6717

Component of the receptor for type I interferons, including interferons alpha, IFNB1 and IFNW1. Functions in general as heterodimer with IFNAR2. Type I interferon binding activates the JAK-STAT signaling cascade, and triggers tyrosine phosphorylation of a number of proteins including JAKs, TYK2, STAT proteins and the IFNR alpha- and beta-subunits themselves. Can form an active IFNB1 receptor by itself and activate a signaling cascade that does not involve activation of the JAK-STAT pathway (By similarity).

Ubiquitinated, leading to its internalization and degradation. Polyubiquitinated via 'Lys-48'-linked and 'Lys-63'-linked ubiquitin chains, leading to receptor internalization and lysosomal degradation. The 'Lys-63'-linked ubiquitin chains are cleaved off by the BRISC complex.

Phosphorylated on serine residues in response to interferon binding; this promotes interaction with FBXW11 and ubiquitination. Phosphorylated on tyrosine residues by TYK2 tyrosine kinase. Phosphorylated on tyrosine residues in response to interferon.

Palmitoylation at Cys-463 is required for the activation of STAT1 and STAT2.

Cell membrane>Single-pass type I membrane protein. Late endosome. Lysosome.
Note: Interferon binding triggers internalization of the receptor from the cell membrane into endosomes and then into lysosomes.

IFN receptors are present in all tissues and even on the surface of most IFN-resistant cells. Isoform 1, isoform 2 and isoform 3 are expressed in the IFN-alpha sensitive myeloma cell line U266B1. Isoform 2 and isoform 3 are expressed in the IFN-alpha resistant myeloma cell line U266R. Isoform 1 is not expressed in IFN-alpha resistant myeloma cell line U266R.

Heterodimer with IFNAR2. Interacts with STAT1 and STAT2; the interaction requires its phosphorylation at Tyr-466. Interacts with TYK2. Interacts (serine-phosphorylated form) with FBXW11, the substrate recognition component of a SCF (SKP1-CUL1-F-box protein) E3 ubiquitin-protein ligase complex. Interacts with SHMT2; this promotes interaction with ABRAXAS2 and the BRISC complex.

Belongs to the type II cytokine receptor family.