The function of SNAPC4 (small nuclear RNA activating complex polypeptide 4, Ensembl gene identifier ENSG00000165684) is as follows. Part of the SNAPc complex required for the transcription of both RNA polymerase II and III small-nuclear RNA genes. Binds to the proximal sequence element (PSE), a non-TATA-box basal promoter element common to these 2 types of genes. Recruits TBP and BRF2 to the U6 snRNA TATA box. .