Involved in 3'-UTR mediated RNA regulation (PubMed:15082763). Binds to RNA-binding and RNA regulatory proteins (PubMed:15082763). Complexes with PAB1-binding protein to promote mRNA interactions with poly(A)-binding protein (PubMed:15082763). Promotes mating-type switching in mother cells by positively regulating HO expression (PubMed:15082763). Interacts (via C-terminus) with PBP1 (via C-terminus). Localizes to polysomes in a PBP1-dependent manner. Normal vegetative cell population growth rate and morphology (PubMed:15082763). Decreases expression from the HO locus (PubMed:15082763). Present with 3430 molecules/cell in log phase SD medium. Belongs to the XPG/RAD2 endonuclease family. Although it belongs to the XPG/RAD2 endonuclease family, only two of the seven Asp residues involved in Mg(2+) binding are conserved suggesting that it has no nuclease activity.