Predicted to enable DNA binding activity and transcription corepressor activity. Predicted to be involved in several processes, including histone H2A monoubiquitination; negative regulation of proteasomal ubiquitin-dependent protein catabolic process; and positive regulation of transcription, DNA-templated. Predicted to act upstream of or within negative regulation of transcription by RNA polymerase II. Predicted to be located in nucleoplasm. Predicted to be part of PcG protein complex. Predicted to be active in nucleus. Orthologous to human RYBP (RING1 and YY1 binding protein). [provided by Alliance of Genome Resources, Apr 2022]