Enables ribonucleoprotein complex binding activity. Involved in cell population proliferation and cleavage in ITS2 between 5.8S rRNA and LSU-rRNA of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA). Acts upstream of or within rRNA processing and ribosomal large subunit biogenesis. Located in nucleolus. Is expressed in several structures, including female reproductive system and urinary system. Orthologous to human BOP1 (BOP1 ribosomal biogenesis factor). [provided by Alliance of Genome Resources, Apr 2022]