Translation initiation regulator which represses repeat- associated non-AUG (RAN) initiated translation probably by acting as a competitive inhibitor of eukaryotic translation initiation factor 5 (EIF5) function (PubMed:29470543, PubMed:34260931). Enhances histone H4 gene transcription but does not seem to bind DNA directly (PubMed:11524015). {ECO:0000269|PubMed:11524015, ECO:0000269|PubMed:29470543, ECO:0000269|PubMed:34260931}. This is the function of ENSG00000082153 (BZW1, basic leucine zipper and W2 domains 1).