| 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 |
| IPR000943 | RNA polymerase sigma-70 | Domain |
| IPR000792 | Transcription regulator LuxR, C-terminal | Domain |
| IPR014218 | RNA polymerase sigma-H 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 |
| IPR014284 | RNA polymerase sigma-70-like domain | Domain |
| IPR013249 | RNA polymerase sigma factor 70, region 4 type 2 | Domain |
| IPR016371 | RNA polymerase sigma-H factor | Family |