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 (By similarity). Component of the cleavage and polyadenylation factor (CPF) complex, which is composed of cft1, cft2, ysh1, pta1, swd2, pfs2, dis2, yth1, ssu72, and fip1.