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. 1994 Sep 27;91(20):9602–9606. doi: 10.1073/pnas.91.20.9602

Role of interferon alpha/beta receptor chain 1 in the structure and transmembrane signaling of the interferon alpha/beta receptor complex.

S N Constantinescu 1, E Croze 1, C Wang 1, A Murti 1, L Basu 1, J E Mullersman 1, L M Pfeffer 1
PMCID: PMC44861  PMID: 7524081

Abstract

A previously cloned cDNA encodes one subunit of the human interferon alpha/beta receptor (IFN alpha R), denoted IFN alpha R1. To study the expression and signaling of IFN alpha R1, we used monoclonal antibodies (mAbs) generated against the baculovirus-expressed ectodomain of IFN alpha R1. Immunoprecipitation and immunoblotting of lysates from a variety of human cell lines showed that IFN alpha R1 has an apparent molecular mass of 135 kDa. Binding analysis with 125I-labeled mAb demonstrated high levels of cell surface expression of IFN alpha R1 in human cells and in mouse cells transfected with IFN alpha R1 cDNA, whereas no cross-reactivity was observed in control mouse L929 cells expressing only the endogenous mouse receptor. The subunit was rapidly down-regulated by IFN alpha (80% decrease within 2 hr) and degraded upon internalization. The IFN alpha R1 chain appeared to be constitutively associated with the 115-kDa subunit of the IFN alpha/beta receptor, since the mAbs coprecipitated this protein. IFN alpha/beta treatment induced tyrosine phosphorylation of IFN alpha R1 within 1 min, with kinetics paralleling that of the IFN-activated protein-tyrosine kinases Jak1 and Tyk2. Ligand-induced tyrosine phosphorylation of IFN alpha R1 was blocked by the kinase inhibitors genistein or staurosporine. Although IFN alpha R1 cDNA-transfected mouse cells expressed high levels of this subunit when compared with empty vector-transfected cells the number of binding sites for human IFN alpha (50-75 sites per cell) was not increased. Human IFN alpha induced the expression of a mouse IFN alpha/beta-responsive gene (the 204 gene) in mouse L929 cells transfected with the IFN alpha R1 cDNA, but not in mock-transfected cells. These results suggest that the IFN alpha R1 subunit acts as a species-specific signal transduction component of the IFN alpha/beta receptor complex.

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Selected References

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