Phosphorylation and specific ubiquitin acceptor sites are required for ubiquitination and degradation of the IFNAR1 subunit of type I interferon receptor.

The Journal of Biological Chemistry
K G Suresh KumarSerge Y Fuchs

Abstract

Ubiquitination, endocytosis, and lysosomal degradation of the IFNAR1 (interferon alpha receptor 1) subunit of the type I interferon (IFN) receptor is mediated by the SCFbeta-Trcp (Skp1-Cullin1-F-box protein beta transducin repeat-containing protein) E3 ubiquitin ligase in a phosphorylation-dependent manner. In addition, stability of IFNAR1 is regulated by its binding to Tyk2 kinase. Here we characterize the determinants of IFNAR1 ubiquitination and degradation. We found that the integrity of two Ser residues at positions 535 and 539 within the specific destruction motif present in the cytoplasmic tail of IFNAR1 is essential for the ability of IFNAR1 to recruit beta-Trcp as well as to undergo efficient ubiquitination and degradation. Using an antibody that specifically recognizes IFNAR1 phosphorylated on Ser535 we found that IFNAR1 is phosphorylated on this residue in cells. This phosphorylation is promoted by treatment of cells with IFNalpha. Although the cytoplasmic tail of IFNAR1 contains seven Lys residues that could function as potential ubiquitin acceptor sites, we found that only three (Lys501, Lys525, and Lys526), all located proximal to the destruction motif, are essential for ubiquitination and degradation of IFNAR1. E...Continue Reading

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