TFIIS-type (IPR001222) is a zinc finger motif that is present in transcription factor II (TFIIS). During mRNA elongation, Pol II may encounter DNA sequences that cause the enzyme to retrace. This backtracking process may lead to transcriptional stalling, which entails the extrusion of the RNA 3'-end into a pore. TFIIS must assist in cleaving the extruded RNA to escape the delay. This process makes RNA polymerase (Pol) II's intrinsic nuclease activity stronger. Pol II then goes through template-encoded pause sites and cuts mRNA.