Enables TBP-class protein binding activity and transcription coactivator activity. Involved in several processes, including heart development; negative regulation of striated muscle cell apoptotic process; and positive regulation of skeletal muscle tissue growth. Acts upstream of or within myoblast migration. Located in cytoplasm and nucleus. Is expressed in several structures, including aorta; genitourinary system; gut; liver; and spleen. Orthologous to human NACA (nascent polypeptide associated complex subunit alpha). [provided by Alliance of Genome Resources, Apr 2022]