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. Is expressed in several structures, including brain; genitourinary system; gut; hemolymphoid system gland; and mammary gland. Orthologous to human RPRD1B (regulation of nuclear pre-mRNA domain containing 1B). [provided by Alliance of Genome Resources, Apr 2022]