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Key regulator of the exon junction complex (EJC), a multiprotein complex that associates immediately upstreamof the exon-exon junction on mRNAs and serves as a positional landmarks for the intron exon structure of genes anddirects post-transcriptional processes in the cytoplasm such as mRNA export, nonsense-mediated mRNA decay (NMD) ortranslation. Acts as a EJC disassembly factor, allowing translation-dependent EJC removal and recycling by disruptingmature EJC from spliced mRNAs. Its association with the 40S ribosomal subunit probably prevents atranslation-independent disassembly of the EJC from spliced mRNAs, by restricting its activity to mRNAs that have beentranslated. Interferes with NMD and enhances translation of spliced mRNAs, probably by antagonizing EJC functions. Maybind RNA; the relevance of RNA-binding remains unclear in vivo, RNA-binding was detected by PubMed:14968132, whilePubMed:19410547 did not detect RNA-binding activity independently of the EJC