| IPR007642 | RNA polymerase Rpb2, domain 2 | Domain |
| IPR015712 | DNA-directed RNA polymerase, subunit 2 | Family |
| IPR037033 | DNA-directed RNA polymerase, subunit 2, hybrid-binding domain superfamily | Homologous Superfamily |
| IPR037034 | RNA polymerase Rpb2, domain 2 superfamily | Homologous Superfamily |
| IPR007120 | DNA-directed RNA polymerase, subunit 2, hybrid-binding domain | Domain |
| IPR007121 | RNA polymerase, beta subunit, conserved site | Conserved Site |
| IPR007645 | RNA polymerase Rpb2, domain 3 | Domain |
| IPR014724 | RNA polymerase Rpb2, OB-fold | Homologous Superfamily |
| IPR019462 | DNA-directed RNA polymerase, beta subunit, external 1 domain | Domain |
| IPR010243 | DNA-directed RNA polymerase beta subunit, bacterial-type | Family |
| IPR007644 | RNA polymerase, beta subunit, protrusion | Domain |
| IPR007641 | RNA polymerase Rpb2, domain 7 | Domain |
| IPR007627 | RNA polymerase sigma-70 region 2 | Domain |
| IPR007127 | RNA polymerase sigma factor 70, region 1.1 | Domain |
| IPR000943 | RNA polymerase sigma-70 | Domain |
| 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 |
| IPR012760 | RNA polymerase sigma factor RpoD, C-terminal | Domain |
| IPR009042 | RNA polymerase sigma-70 region 1.2 | Domain |
| IPR007630 | RNA polymerase sigma-70 region 4 | Domain |
| IPR014284 | RNA polymerase sigma-70-like domain | Domain |
| IPR007624 | RNA polymerase sigma-70 region 3 | Domain |
| IPR028630 | RNA polymerase sigma factor RpoD | Family |
| IPR042189 | Sigma-70 factor, region 1.1 superfamily | Homologous Superfamily |
| IPR050239 | Sigma-70 factor family, RNA polymerase initiation factors | Family |