The function of BZW2 (basic leucine zipper and W2 domains 2, Ensembl gene identifier ENSG00000136261) is as follows. Translation initiation regulator which represses non-AUG initiated translation and repeat-associated non-AUG (RAN) initiated translation by acting as a competitive inhibitor of eukaryotic translation initiation factor 5 (EIF5) function (PubMed:21745818, PubMed:28981728, PubMed:29470543, PubMed:34260931). Increases the accuracy of translation initiation by impeding EIF5-dependent translation from non-AUG codons by competing with it for interaction with EIF2S2 within the 43S pre-initiation complex (PIC) in an EIF3C- binding dependent manner (PubMed:21745818, PubMed:28981728, PubMed:34260931). {ECO:0000269|PubMed:21745818, ECO:0000269|PubMed:28981728, ECO:0000269|PubMed:29470543, ECO:0000269|PubMed:34260931}.