| Domain | Name | Category | Type |
| IPR000722 | RNA polymerase, alpha subunit | Domain | Domain |
| IPR006592 | RNA polymerase, N-terminal | Domain | Domain |
| IPR007066 | RNA polymerase Rpb1, domain 3 | Domain | Domain |
| IPR007080 | RNA polymerase Rpb1, domain 1 | Domain | Domain |
| IPR007081 | RNA polymerase Rpb1, domain 5 | Domain | Domain |
| IPR007083 | RNA polymerase Rpb1, domain 4 | Domain | Domain |
| IPR035697 | DNA-directed RNA polymerase III subunit RPC1, N-terminal | Domain | Domain |
| IPR035698 | DNA-directed RNA polymerase III subunit RPC1, C-terminal | Domain | Domain |
| IPR038120 | RNA polymerase Rpb1, funnel domain superfamily | Family | Homologous superfamily |
| IPR042102 | RNA polymerase Rpb1, domain 3 superfamily | Family | Homologous superfamily |