Predicted to enable RNA polymerase II complex binding activity and identical protein binding activity. Predicted to be involved in several processes, including mRNA 3'-end processing; positive regulation of cell population proliferation; and regulation of transcription by RNA polymerase II. Predicted to be located in nucleoplasm. Predicted to be part of RNA polymerase II, holoenzyme. Orthologous to human RPRD1B (regulation of nuclear pre-mRNA domain containing 1B). [provided by Alliance of Genome Resources, Apr 2022]