| 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 |
F [auth M] | IPR038709 | RNA polymerase sigma-54 factor, core-binding domain superfamily | Homologous Superfamily |
F [auth M] | IPR000394 | RNA polymerase sigma factor 54 | Family |
F [auth M] | IPR007046 | RNA polymerase sigma factor 54, core-binding domain | Domain |
F [auth M] | IPR007634 | RNA polymerase sigma factor 54, DNA-binding | Domain |