This domain family is found in eukaryotes, and is approximately 20 amino acids in length, and the family is found in association with Pfam:PF02865, Pfam:PF00017, Pfam:PF01017, Pfam:PF02864. This domain is the C terminal domain of STAT1. This domain binds selectively to the TAZ2 domain of CRB (CREB-binding protein). In this process it becomes a transcriptional activator and can initiate transcription of certain genes.

1: Structural basis for recruitment of CBP/p300 coactivators by STAT1 and STAT2 transactivation domains. Wojciak JM, Martinez-Yamout MA, Dyson HJ, Wright PE; EMBO J. 2009;28:948-958. PMID:19214187