| IPR011773 | DNA-directed RNA polymerase, alpha subunit | Family |
| IPR011260 | RNA polymerase, alpha subunit, C-terminal | Domain |
| IPR011263 | DNA-directed RNA polymerase, RpoA/D/Rpb3-type | Domain |
| IPR036603 | RNA polymerase, RBP11-like subunit | Homologous Superfamily |
| IPR011262 | DNA-directed RNA polymerase, insert domain | Domain |
| IPR036643 | DNA-directed RNA polymerase, insert domain superfamily | Homologous Superfamily |
| IPR007120 | DNA-directed RNA polymerase, subunit 2, hybrid-binding domain | Domain |
| IPR007121 | RNA polymerase, beta subunit, conserved site | Conserved Site |
| IPR014724 | RNA polymerase Rpb2, OB-fold | Homologous Superfamily |
| 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 |
| IPR042107 | DNA-directed RNA polymerase, beta subunit, external 1 domain superfamily | Homologous Superfamily |
| IPR037034 | RNA polymerase Rpb2, domain 2 superfamily | Homologous Superfamily |
| IPR007645 | RNA polymerase Rpb2, domain 3 | Domain |
| 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 |
| IPR007081 | RNA polymerase Rpb1, domain 5 | Domain |
| IPR045867 | DNA-directed RNA polymerase, subunit beta-prime | Family |
| IPR007083 | RNA polymerase Rpb1, domain 4 | Domain |
| IPR044893 | RNA polymerase Rpb1, clamp domain superfamily | Homologous Superfamily |
| IPR006592 | RNA polymerase, N-terminal | Domain |
| IPR007066 | RNA polymerase Rpb1, domain 3 | Domain |
| IPR012754 | DNA-directed RNA polymerase, subunit beta-prime, bacterial type | Family |
| IPR042102 | RNA polymerase Rpb1, domain 3 superfamily | Homologous Superfamily |
| IPR000722 | RNA polymerase, alpha subunit | Domain |
| IPR038120 | RNA polymerase Rpb1, funnel domain superfamily | Homologous Superfamily |
| IPR007080 | RNA polymerase Rpb1, domain 1 | Domain |
| IPR006110 | RNA polymerase, subunit omega/Rpo6/RPB6 | Family |
| IPR036161 | RPB6/omega subunit-like superfamily | Homologous Superfamily |
| IPR003716 | DNA-directed RNA polymerase, omega subunit | Family |
| 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 |
| IPR014284 | RNA polymerase sigma-70 like domain | Domain |
| IPR009042 | RNA polymerase sigma-70 region 1.2 | Domain |
| IPR007630 | RNA polymerase sigma-70 region 4 | Domain |
| IPR007624 | RNA polymerase sigma-70 region 3 | Domain |
| IPR007631 | RNA polymerase sigma factor 70, non-essential domain | Domain |
| IPR028630 | RNA polymerase sigma factor RpoD | Family |
| IPR042189 | Sigma-70 factor, region 1.1 superfamily | Homologous Superfamily |
| IPR039420 | Transcriptional regulatory protein WalR-like | Family |
| IPR011006 | CheY-like superfamily | Homologous Superfamily |
| IPR001789 | Signal transduction response regulator, receiver domain | Domain |
| IPR000792 | Transcription regulator LuxR, C-terminal | Domain |
| IPR016032 | Signal transduction response regulator, C-terminal effector | Homologous Superfamily |
| IPR036388 | Winged helix-like DNA-binding domain superfamily | Homologous Superfamily |