Possible transcription factor. Specifically binds to the CT/GC-rich region of the interleukin-3 promoter and mediates tax transactivation of IL-3. {ECO:0000269|PubMed:36657711, ECO:0000269|PubMed:8035792}. This is the function of VEZF1 (vascular endothelial zinc finger 1, Ensembl gene identifier ENSG00000136451).