| IPR007627 | RNA polymerase sigma-70 region 2 | Domain |
| IPR000943 | RNA polymerase sigma-70 | Domain |
| IPR014322 | RNA polymerase sigma-B/F/G type | Family |
| IPR013325 | RNA polymerase sigma factor, region 2 | Homologous Superfamily |
| IPR013324 | RNA polymerase sigma factor, region 3/4-like | Homologous Superfamily |
| IPR036388 | Winged helix-like DNA-binding domain superfamily | Homologous Superfamily |
| IPR014288 | RNA polymerase sigma-B factor | Family |
| IPR007630 | RNA polymerase sigma-70 region 4 | Domain |
| IPR014284 | RNA polymerase sigma-70-like domain | Domain |
| IPR007624 | RNA polymerase sigma-70 region 3 | Domain |
| IPR007066 | RNA polymerase Rpb1, domain 3 | Domain |
| IPR007081 | RNA polymerase Rpb1, domain 5 | Domain |
| IPR045867 | DNA-directed RNA polymerase, subunit beta-prime | Family |
| IPR012754 | DNA-directed RNA polymerase, subunit beta-prime, bacterial type | Family |
| IPR042102 | RNA polymerase Rpb1, domain 3 superfamily | Homologous Superfamily |
| IPR007083 | RNA polymerase Rpb1, domain 4 | Domain |
| IPR000722 | RNA polymerase, alpha subunit | Domain |
| IPR044893 | RNA polymerase Rpb1, clamp domain superfamily | Homologous Superfamily |
| IPR038120 | RNA polymerase Rpb1, funnel domain superfamily | Homologous Superfamily |
| IPR006592 | RNA polymerase, N-terminal | Domain |
| IPR007080 | RNA polymerase Rpb1, domain 1 | Domain |