Enables transcription coregulator activity. Involved in negative regulation of transcription by RNA polymerase II. Acts upstream of or within regulation of transcription, DNA-templated. Located in nucleus. Part of ESC/E(Z) complex. Is expressed in autopod; brain; early conceptus; genitourinary system; and gut. Used to study Hirschsprung's disease and Waardenburg's syndrome. Orthologous to human AEBP2 (AE binding protein 2). [provided by Alliance of Genome Resources, Apr 2022]