RNA-binding component of the cleavage and polyadenylation factor (CPF) complex, which plays a key role in polyadenylation-dependent pre-mRNA 3'-end formation and cooperates with cleavage factors including the CFIA complex and NAB4/CFIB. May be involved in poly(A)-site recognition. May be involved in the association of the CPF, CPFIA and RNA polymerase II complexes. Component of the cleavage and polyadenylation factor (CPF) complex, which is composed of at least PTI1, SYC1, SSU72, GLC7, MPE1, REF2, PFS2, PTA1, YSH1/BRR5, SWD2, CFT2/YDH1, YTH1, CFT1/YHH1, FIP1 and PAP1. Interacts with the CTD domain of RPB1/RNA polymerase II; the interaction is enhanced upon phosphorylation of the RPB1 CTD domain. Interacts with PCF11. Present with 3060 molecules/cell in log phase SD medium.