| Domain | Name | Category | Type |
| IPR007120 | DNA-directed RNA polymerase, subunit 2, hybrid-binding domain | Domain | Domain |
| IPR007121 | RNA polymerase, beta subunit, conserved site | Site | Conserved site |
| IPR007641 | RNA polymerase Rpb2, domain 7 | Domain | Domain |
| IPR007642 | RNA polymerase Rpb2, domain 2 | Domain | Domain |
| IPR007644 | RNA polymerase, beta subunit, protrusion | Domain | Domain |
| IPR007645 | RNA polymerase Rpb2, domain 3 | Domain | Domain |
| IPR007646 | RNA polymerase Rpb2, domain 4 | Domain | Domain |
| IPR007647 | RNA polymerase Rpb2, domain 5 | Domain | Domain |
| IPR014724 | RNA polymerase Rpb2, OB-fold | Family | Homologous superfamily |
| IPR015712 | DNA-directed RNA polymerase, subunit 2 | Family | Family |
| IPR037033 | DNA-directed RNA polymerase, subunit 2, hybrid-binding domain superfamily | Family | Homologous superfamily |
| IPR037034 | RNA polymerase Rpb2, domain 2 superfamily | Family | Homologous superfamily |