| IPR011773 | DNA-directed RNA polymerase, alpha subunit | Family |
| IPR011262 | DNA-directed RNA polymerase, insert domain | Domain |
| IPR011260 | RNA polymerase, alpha subunit, C-terminal | Domain |
| IPR011263 | DNA-directed RNA polymerase, RpoA/D/Rpb3-type | Domain |
| IPR036643 | DNA-directed RNA polymerase, insert domain superfamily | Homologous Superfamily |
| IPR036603 | RNA polymerase, RBP11-like subunit | 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 |
| 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 |
| IPR010243 | DNA-directed RNA polymerase beta subunit, bacterial-type | Family |
| IPR007641 | RNA polymerase Rpb2, domain 7 | Domain |
| IPR045867 | DNA-directed RNA polymerase, subunit beta-prime | Family |
| IPR034678 | DNA-directed RNA polymerase subunit RpoC1 | Family |
| IPR042102 | RNA polymerase Rpb1, domain 3 superfamily | Homologous Superfamily |
| IPR000722 | RNA polymerase, alpha subunit | Domain |
| IPR044893 | RNA polymerase Rpb1, clamp domain superfamily | Homologous Superfamily |
| IPR006592 | RNA polymerase, N-terminal | Domain |
| IPR007080 | RNA polymerase Rpb1, domain 1 | Domain |
| IPR007081 | RNA polymerase Rpb1, domain 5 | Domain |
| IPR007083 | RNA polymerase Rpb1, domain 4 | Domain |
| IPR038120 | RNA polymerase Rpb1, funnel domain superfamily | Homologous Superfamily |
| IPR012756 | DNA-directed RNA polymerase, subunit beta'' | Family |
| IPR042102 | RNA polymerase Rpb1, domain 3 superfamily | Homologous Superfamily |