Involved in post-transcriptional regulation of gene expression (PubMed:24470144). Promotes mRNA stabilization by recruiting a complex containing PBP1, LSM12 and XAC1 to mRNAs (PubMed:24470144, PubMed:32532821). Recruited to mRNAs by sequence-specific RNA binding proteins (PubMed:24470144). May regulate translation through interactions with the EIF4E6-EIF4G5 translation initiation complex (PubMed:32532821). Forms a complex composed of at least MKT1, PBP1, XAC1 and LSM12 (PubMed:32532821). Within the complex, interacts (via C-terminus) with PBP1; the interaction is direct (PubMed:32532821, PubMed:24470144). Interacts with RNA-binding protein ZC3H11 (via MKT1-binding motif); the interaction is direct (PubMed:32532821, PubMed:24470144). May interact with RNA-binding proteins CFB1 and CFB2 (PubMed:32532821). Interacts with the EIF4E6-EIF4G5 translation initiation complex via EIF4G5; the interaction with EIF4G5 is direct (PubMed:32532821). Localizes to polysomes (PubMed:24470144). Partially localizes to starvation-induced stress granules but not to heat shock-induced stress granules (PubMed:24470144). Expressed in the procyclic and bloodstream forms (at protein level). RNAI-mediated knockdown in the bloodstream form is lethal (PubMed:24470144). RNAi-mediated knockdown in the procyclic form has no effect on viability (PubMed:24470144). 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.