Enables several functions, including DNA-binding transcription factor binding activity; TFIIB-class transcription factor binding activity; and disordered domain specific binding activity. Involved in several processes, including cellular response to virus; face morphogenesis; and negative regulation of interferon-beta production. Acts upstream of or within cellular response to hepatocyte growth factor stimulus; germ-line stem cell population maintenance; and regulation of gene expression. Located in chromatin and nucleus. Part of RNA polymerase II transcription regulator complex; histone acetyltransferase complex; and outer kinetochore. Is expressed in several structures, including alimentary system; embryo ectoderm; genitourinary system; heart; and skin. Used to study Rubinstein-Taybi syndrome; acute myeloid leukemia; autism spectrum disorder; and myelodysplastic syndrome. Human ortholog(s) of this gene implicated in Rubinstein-Taybi syndrome; acute lymphoblastic leukemia; and acute myeloid leukemia. Orthologous to human CREBBP (CREB binding protein).