transcription factor of the STAT family. Phosphorylated and activated by receptor-associated kinases downstream of certain receptor tyrosine kinases, GPCRs, and receptors for various interleukins and interferons. Forms homo- or heterodimers that translocate into the nucleus where they regulate transcription. Two alternatively spliced isoforms have been described. Note: This description may include information from UniProtKB.
Cellular Component: axon; cytoplasm; cytosol; dendrite; nuclear chromatin; nucleolus; nucleoplasm; nucleus; perinuclear region of cytoplasm
Molecular Function: double-stranded DNA binding; enzyme binding; identical protein binding; protein binding; protein homodimerization activity; transcription factor activity; tumor necrosis factor receptor binding
Biological Process: apoptosis; blood circulation; endothelial cell migration; JAK-STAT cascade; negative regulation of angiogenesis; negative regulation of endothelial cell proliferation; negative regulation of I-kappaB kinase/NF-kappaB cascade; negative regulation of transcription from RNA polymerase II promoter; negative regulation of viral protein levels in host cell; positive regulation of mesenchymal cell proliferation; positive regulation of smooth muscle cell proliferation; positive regulation of transcription from RNA polymerase II promoter; positive regulation of transcription, DNA-dependent; regulation of apoptosis; response to cAMP; response to cytokine stimulus; response to peptide hormone stimulus; tumor necrosis factor-mediated signaling pathway
Alt. Names/Synonyms: DKFZp686B04100; ISGF-3; signal transducer and activator of transcription 1, 91kDa; Signal transducer and activator of transcription 1-alpha/beta; signal transducer and activator of transcription-1; STAT1; STAT91; Transcription factor ISGF-3 components p91/p84
LTP: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.