Transcription factor that specifically binds to the octamer motif (5'-ATTTGCAT-3') (PubMed:2904654, PubMed:7859290). Regulates IL6 expression in B cells with POU2AF1 (By similarity). Regulates transcription in a number of tissues in addition to activating immunoglobulin gene expression (PubMed:2901913, PubMed:2904654). Modulates transcription transactivation by NR3C1, AR and PGR (PubMed:10480874). {ECO:0000250|UniProtKB:Q00196, ECO:0000269|PubMed:10480874, ECO:0000269|PubMed:2328728, ECO:0000269|PubMed:2901913, ECO:0000269|PubMed:2904654, ECO:0000269|PubMed:7859290}. [Isoform 5]: Activates the U2 small nuclear RNA (snRNA) promoter. . This is the function of POU2F2 (POU class 2 homeobox 2, Ensembl gene identifier ENSG00000028277).