Predicted to enable 5'-3' RNA exonuclease activity; RNA binding activity; and RNA endonuclease activity. Predicted to be involved in mRNA 3'-end processing by stem-loop binding activity and cleavage and mRNA polyadenylation. Predicted to be located in nucleus. Predicted to be part of mRNA cleavage and polyadenylation specificity factor complex. Expressed in tail. Is an ortholog of human CPSF3 (cleavage and polyadenylation specific factor 3).