Enables transcription coactivator activity. Involved in response to estrogen. Acts upstream of or within positive regulation of transcription, DNA-templated. Located in cytoplasm and nucleus. Is expressed in several structures, including alimentary system; central nervous system; eye; genitourinary system; and hemolymphoid system. Orthologous to human CITED4 (Cbp/p300 interacting transactivator with Glu/Asp rich carboxy-terminal domain 4). [provided by Alliance of Genome Resources, Apr 2022]