Stimulates mRNA translation. Interacts with PABPC1 (PubMed:20573744, Ref.23). Interacts with RACK1 (PubMed:20573744). Associates with polysomes via the 40S ribosomal subunit (PubMed:20573744). Localized in cytoplasmic mRNP granules containing untranslated mRNAs in response to arsenite treatment. Extended N-terminus.