The protein encoded by this gene is a member of the STAT protein family. In response to cytokines and growth factors, STAT family members are phosphorylated by the receptor associated kinases, and then form homo- or heterodimers that translocate to the cell nucleus where they act as transcription activators. In response to interferon (IFN), this protein forms a complex with STAT1 and IFN regulatory factor family protein p48 (ISGF3G), in which this protein acts as a transactivator, but lacks the ability to bind DNA directly. Transcription adaptor P300/CBP (EP300/CREBBP) has been shown to interact specifically with this protein, which is thought to be involved in the process of blocking IFN-alpha response by adenovirus. (provided by RefSeq)
Signal transducer and activator of transcription-2 (STAT2) interacts with STAT1 and is responsible for activation of STAT1. Absence of STAT2 abolishes IFN (Interferon)-α signaling. Simian virus 5 V protein interacts with DDB1 (DNA damage binding protein-1) and STAT2 for mediating STAT1 degradation. Human cytomegalovirus IE1 (immediate-early) and dengue virus polymerase NS5 (non-structural protein 5) interacts with STAT2, and represses IFN-stimulated antiviral response.
