Enables RNA binding activity. Acts upstream of or within negative regulation of transcription by RNA polymerase II. Located in nucleus. Part of ESC/E(Z) complex and NuRD complex. Is expressed in several structures, including alimentary system; brain; early embryo; genitourinary system; and hemolymphoid system. Orthologous to human RBBP7 (RB binding protein 7, chromatin remodeling factor). [provided by Alliance of Genome Resources, Apr 2022]