Component of the cleavage factor IA (CFIA) complex, which is involved in the endonucleolytic cleavage during polyadenylation-dependent pre-mRNA 3'-end formation and cooperates with cleavage factor NAB4/CFIB and the cleavage and polyadenylation factor (CPF) complex. Independently involved in RNA polymerase II transcript termination. Binds RNA. Seems to bridge RNA polymerase II and the native transcript and may be involved in dismantling the RNA polymerase II elongation complex. Component of the CFIA complex, which is composed of RNA14, RNA15, PCF11 and CLP1. Interacts with RNA14, RNA15 and RTT103. Interacts directly with the phosphorylated CTD domain of RPB1/RNA polymerase II. Present with 2800 molecules/cell in log phase SD medium.