Predicted to enable metal ion binding activity. Predicted to be involved in histone H2A-K119 monoubiquitination; inactivation of X chromosome by genetic imprinting; and regulation of transcription by RNA polymerase II. Predicted to act upstream of or within positive regulation of transcription by RNA polymerase II. Predicted to be located in Golgi apparatus; centrosome; and nucleoplasm. Predicted to be part of PRC1 complex. Predicted to colocalize with X chromosome. Orthologous to human PCGF5 (polycomb group ring finger 5). [provided by Alliance of Genome Resources, Apr 2022]