Abstract
Interferon alpha induction of transcription operates through interferon-stimulated-gene factor 3 (ISGF), a transcription factor two components of which are members of the newly characterized Stat family of transcription factors. Interferon alpha induces tyrosine phosphorylation of Stat1 and Stat2 proteins that associate and, together with a 48-kDa protein, form ISGF3. Evidence is presented that a heterodimer of Stat1 and Stat2 is present in ISGF3 and that Stat1 and the 48-kDa protein make precise contact, while Stat2 makes general contact, with the interferon-stimulated response element, the binding site of the ISGF3.
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