金山科研平台，产品价格货期咨询微信：jinshanbio Molecule Information: STAT5a/b Long Name: Signal Transducer and Activator of Transcription 5b Background: STAT5a/b The STAT family of transcription factors, first described as key mediators of interferon signal transduction, are now recognized as signaling factors downstream of many cytokines, growth factors, and hormones. At least seven STATs exist: STAT1, 2, 3, 4, 5a, 5b, and 6. They are responsible for an array of cellular activities including regulating growth, survival, differentiation, motility, and the immune response. They are characterized structurally by the presence of the Src homology 2 (SH2) domain, and a C-terminal tyrosine phosphorylation site. Upon ligand binding, they are recruited to the activated receptor, via their SH2 domains, to receptor-associated tyrosine kinases of the Janus kinase family (JAK). Once phosphorylated by JAK, STATS are free to hetero- or homo-dimerize, and translocate to the nucleus where they bind DNA to regulate gene transcription.

Signal transduction and activator of transcription 5 (STAT5) is a member of the Jak/STAT signal transduction pathway and is activated by a variety of cytokines (IL22, IL6, IFN-α). STAT5 has two isoforms (A and B) that share 93% amino acid identity and bind the DNA consensus site TTCN3GAA. STAT5 mediates cytokine signaling by acting as a signal transducer in the cytoplasm and, upon phosphorylation, translocates to the nucleus and activates transcription of specific genes. STAT5 is involved in a wide array of biological processes ranging from regulating apoptosis to adult mammary gland proliferation, differentiation and survival.