Transcription factor that regulates expression of genes transcribed by both RNA polymerases II and III (PubMed:10893243, PubMed:9705341). Specifically recognizes and binds the Staf-binding site (SBS), a consensus DNA-binding motif present in many promoters (PubMed:9705341). Able to activate expression of small nuclear RNA (snRNA) transcribed by RNA polymerases II and III (PubMed:9705341). Also regulates expression of mRNAs and acts as a DNA-binding transcription repressor that inhibits the activity of the TATA-binding protein (TBP) (PubMed:15280358, PubMed:16337145). {ECO:0000269|PubMed:10893243, ECO:0000269|PubMed:15280358, ECO:0000269|PubMed:16337145, ECO:0000269|PubMed:9705341}. This is the function of ENSG00000065029 (ZNF76, zinc finger protein 76).